EP3234370B1 - Compression unit for high and low pressure services - Google Patents

Compression unit for high and low pressure services Download PDF

Info

Publication number
EP3234370B1
EP3234370B1 EP15801858.0A EP15801858A EP3234370B1 EP 3234370 B1 EP3234370 B1 EP 3234370B1 EP 15801858 A EP15801858 A EP 15801858A EP 3234370 B1 EP3234370 B1 EP 3234370B1
Authority
EP
European Patent Office
Prior art keywords
unit
compression unit
driver
shaft
overhung
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15801858.0A
Other languages
German (de)
French (fr)
Other versions
EP3234370A1 (en
Inventor
Stefano Bresciani
Lorenza Sassolini
Nicola Banchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuovo Pignone Technologie SRL
Original Assignee
Nuovo Pignone Technologie SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuovo Pignone Technologie SRL filed Critical Nuovo Pignone Technologie SRL
Publication of EP3234370A1 publication Critical patent/EP3234370A1/en
Application granted granted Critical
Publication of EP3234370B1 publication Critical patent/EP3234370B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/163—Combinations of two or more pumps ; Producing two or more separate gas flows driven by a common gearing arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04024—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of purified feed air, so-called boosted air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109—Arrangements of compressors and /or their drivers
    • F25J3/04145—Mechanically coupling of different compressors of the air fractionation process to the same driver(s)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/20—Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft

Definitions

  • the present invention relates to a compression unit for supplying a complete pressure service to a plant, the single compression unit being capable of supplying high and low pressure services.
  • EP 2 902 737 A2 discloses a compression arrangement in which a first compression stage is driven on one end of a driver while an integrally geared centrifugal compressor is also provided.
  • CN 102 979 751 A discloses a single-shaft plusing multiple-shaft type carbon dioxide centrifugal compressor unit.
  • a main drawback of the prior art is the complexity of the overall architecture and configuration of the compression units, this leading to bulky apparatus.
  • each of such compression units comprising a dedicated driver and associated impellers which increase the overall dimensions of the units.
  • a first embodiment of the present invention relates to a single compression unit for supplying a complete compression service consisting of high and low pressure gas to a process plant.
  • the compression unit is configured to supply high and low pressure gas flow with a simple architecture and with a configuration which reduces overall dimensions and weight of the unit, and also has an increased efficiency with respect to the state of the art.
  • impellers having a large diameter can process a high flow rate but work with reduced rotational speed and, therefore, a limited compression ratio.
  • the term "low" pressure here indicates rating values within a typical range comprised between 150 and 300, while the impeller can process a flow rate which could be comprised in a range between 50.000 and 200.000 m 3 per hour.
  • a typical speed value of an impeller processing said flow rates is 5.000 to 1.800 rounds per minute thus indicated for a direct coupled solution.
  • the term "high" pressure here indicates typical rating values comprised between 300 and 2500, with an inlet pressure value between 3 and 50 bar for the first impeller.
  • the impeller processes low flow rates, typically less than 50.000 m 3 per hour.
  • Such compression unit 1 comprises a single driver 2 associated with two driver shaft-ends projecting apart from said driver 2 along opposite directions, a first driver shaft end 3 and a second driver shaft end 4.
  • the driver 2 divides the compression unit into two sides; on one side, a first unit 10 is operatively connected to the first driver shaft-end 3, while a second unit 20 is operatively connected to the second driver shaft-end 4.
  • Said first unit 10 comprises an impeller 11, and said second unit comprises a bull gear 21 in an integrally geared-compressor arrangement.
  • said impeller 11 of said first unit 10 is an overhung impeller directly connected to the first driver shaft-end 3, by means of a flexible coupling.
  • an overhung impeller is an impeller having no bearing/s on the opposite side with respect to the driver, thus all bearing/s of the overhang impeller are arranged between the impeller and the driver.
  • the impeller 11 of the first unit is the "low" pressure source unit: typical values of flow rate processed by the overhung impeller are about 50.000 m 3 per hour, with an inlet pressure value of around 1 bar and an outlet pressure value of about 2 or 3 bar.
  • the bull gear 21 is connected by means of a flexible coupling, to said second driver shaft-end 4.
  • said second unit 20 comprises the bull gear 21 which drives at least one driven shaft 22, 23 through pinions in a typical integrally geared-compressor arrangement.
  • the bull gear 21 comprises two or more driven shafts, for example a first driven shaft 22 and a second driven shaft 23, which are drivingly connected to the bull gear 21 by means of respectively pinions.
  • Said pinions are teethed wheels having a diameter smaller than the diameter of the bull gear.
  • the pinions are engaged directly on the bull gear so that the rotation of the latter produces the rotation of pinions.
  • Each of said driven shafts supports at its opposite ends an overhung impeller 22a, 22b, 23a, 23b.
  • the two driven shafts 22, 23 are configured to rotate at different rotary speed.
  • Typical flow rate values for the second unit 20 are about 50.000 and 200.000 m 3 per hour, with casing rating varying between ANSI 300 and 1500.
  • the driver 2 drives the single overhung impeller 11 connected to said first driver shaft 3.
  • the same driver 2 drives the bull gear 21 which comprises preferably two driven shafts 22, 23, the first driven shaft 22 supports at its ends a couple of first overhung impellers 22a, 22b, the second driven shaft 23 supports at its ends a couple of second overhung impellers 23a, 23b.
  • the first overhung impellers 22a, 22b and the second overhung impellers 23a, 23b are fluidly connected so that the gas flow passes through the first overhung impellers 22a, 22b of the first driven shaft 22 and then through the second overhung impellers of the second driven shaft 23, thus forming a second multi stage compression unit for compressing a small flow rate up to high pressure values.
  • This configuration is illustrated in Figure 1 by means of dashed lines indicated with the reference number 40 which represent the hydraulic connection between the impellers.
  • the outlet of the overhung impeller 11 of the first unit 10 is fluidly connected to the inlet of the second unit 20, thus forming a another multi stage compression unit.
  • This configuration is represented in Figure 1 by means of dashed line 30 which represent the hydraulic connection between the units.
  • the first unit 10 provides the gas flow rate to the second unit 20 thus obtaining a compression unit apt to elaborate large flow rates with an high overall compression rate.
  • the first unit 10 comprises an overhung impeller 11 which is connected to said first driver shaft 3 by means of a gear arrangement, instead that flanged to said first driver shaft.
  • the first unit 10 comprises a beam compressor.
  • Typical beam compressor casing rating varies from ANSI 600 to API 15000.
  • the inlet of the beam compressor is hydraulically connected to the outlet of the second unit 20.
  • the first unit 10 receives the flow rate coming from the output of the second unit 20, thus forming a first multi stage compression unit allowing to reach higher compression rates.
  • the hydraulic connection between the first 10 and the second 20 unit is represented in Figure 2 by means of the dashed line 50.
  • the compression unit according to the present invention therefore solves the drawbacks afflicting the prior art.
  • One of the results achieved with the compression unit according to the present invention is to reduce the footprint of the apparatus, with an extremely versatile configuration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

  • The present invention relates to a compression unit for supplying a complete pressure service to a plant, the single compression unit being capable of supplying high and low pressure services.
  • EP 2 902 737 A2 discloses a compression arrangement in which a first compression stage is driven on one end of a driver while an integrally geared centrifugal compressor is also provided. CN 102 979 751 A discloses a single-shaft plusing multiple-shaft type carbon dioxide centrifugal compressor unit.
  • Within a process plant, to supply high pressure gas and low pressure gas several different units are usually provided to process different flow rates at different pressure values.
  • A main drawback of the prior art is the complexity of the overall architecture and configuration of the compression units, this leading to bulky apparatus.
  • In fact, usually separate units are used to provide gas at different pressure values to a process plant, each of such compression units comprising a dedicated driver and associated impellers which increase the overall dimensions of the units.
    • SUMMARY
  • The present invention is defined in the accompanying claims.
  • A first embodiment of the present invention relates to a single compression unit for supplying a complete compression service consisting of high and low pressure gas to a process plant.
  • The compression unit is configured to supply high and low pressure gas flow with a simple architecture and with a configuration which reduces overall dimensions and weight of the unit, and also has an increased efficiency with respect to the state of the art.
  • In order to better clarify what is to be intended with the terms "high" and "low" pressure reference to the compressor flanges rating, according to ANSI, will be done hereafter.
  • As known in the art, technical limits exist while designing an impeller.
  • One of these limits is represented by the peripheral speed of the impeller.
  • It is known in the art that impellers having a large diameter can process a high flow rate but work with reduced rotational speed and, therefore, a limited compression ratio. In order to give typical values, the term "low" pressure here indicates rating values within a typical range comprised between 150 and 300, while the impeller can process a flow rate which could be comprised in a range between 50.000 and 200.000 m3 per hour.
  • A typical speed value of an impeller processing said flow rates is 5.000 to 1.800 rounds per minute thus indicated for a direct coupled solution. The term "high" pressure here indicates typical rating values comprised between 300 and 2500, with an inlet pressure value between 3 and 50 bar for the first impeller. In order to reach very high compression rates, the impeller processes low flow rates, typically less than 50.000 m3 per hour.
  • Further details and specific embodiments will refer to the attached drawing, in which:
    • Figure 1 is a schematic representation of a compression unit not forming part of the present invention, some features of preferred embodiments of the invention are however explained in the context of figure 1;
    • Figure 2 is a schematic representation of the compression unit of the present invention.
    DETAILED DESCRIPTION
  • The following description of exemplary embodiments refers to the accompanying drawings. The following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims.
  • Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the subject matter disclosed. Thus, the appearance of the phrases "in one embodiment" or "in an embodiment" in various places throughout the specification is not necessarily referring to the same embodiment. Further, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
  • Such compression unit 1 comprises a single driver 2 associated with two driver shaft-ends projecting apart from said driver 2 along opposite directions, a first driver shaft end 3 and a second driver shaft end 4.
  • In order to better describe the invention, it can be considered that the driver 2 divides the compression unit into two sides; on one side, a first unit 10 is operatively connected to the first driver shaft-end 3, while a second unit 20 is operatively connected to the second driver shaft-end 4.
  • Said first unit 10 comprises an impeller 11, and said second unit comprises a bull gear 21 in an integrally geared-compressor arrangement.
  • According to the invention, said impeller 11 of said first unit 10 is an overhung impeller directly connected to the first driver shaft-end 3, by means of a flexible coupling.
  • According to the present invention, an overhung impeller is an impeller having no bearing/s on the opposite side with respect to the driver, thus all bearing/s of the overhang impeller are arranged between the impeller and the driver.
  • In the example of figure 1, the impeller 11 of the first unit is the "low" pressure source unit: typical values of flow rate processed by the overhung impeller are about 50.000 m3 per hour, with an inlet pressure value of around 1 bar and an outlet pressure value of about 2 or 3 bar.
  • The bull gear 21 is connected by means of a flexible coupling, to said second driver shaft-end 4.
  • As shown in Figure 1, said second unit 20 comprises the bull gear 21 which drives at least one driven shaft 22, 23 through pinions in a typical integrally geared-compressor arrangement. Preferably, in order to obtain higher outlet pressure values, the bull gear 21 comprises two or more driven shafts, for example a first driven shaft 22 and a second driven shaft 23, which are drivingly connected to the bull gear 21 by means of respectively pinions.
  • Said pinions are teethed wheels having a diameter smaller than the diameter of the bull gear. The pinions are engaged directly on the bull gear so that the rotation of the latter produces the rotation of pinions. Each of said driven shafts supports at its opposite ends an overhung impeller 22a, 22b, 23a, 23b.
  • According to an embodiment of the present invention, the two driven shafts 22, 23 are configured to rotate at different rotary speed.
  • Typical flow rate values for the second unit 20 are about 50.000 and 200.000 m3 per hour, with casing rating varying between ANSI 300 and 1500.
  • As shown in Figure 1, the driver 2 drives the single overhung impeller 11 connected to said first driver shaft 3.
  • On the other side of the compression unit 1, the same driver 2 drives the bull gear 21 which comprises preferably two driven shafts 22, 23, the first driven shaft 22 supports at its ends a couple of first overhung impellers 22a, 22b, the second driven shaft 23 supports at its ends a couple of second overhung impellers 23a, 23b.
  • According to the scheme of Figure 1, the first overhung impellers 22a, 22b and the second overhung impellers 23a, 23b are fluidly connected so that the gas flow passes through the first overhung impellers 22a, 22b of the first driven shaft 22 and then through the second overhung impellers of the second driven shaft 23, thus forming a second multi stage compression unit for compressing a small flow rate up to high pressure values. This configuration is illustrated in Figure 1 by means of dashed lines indicated with the reference number 40 which represent the hydraulic connection between the impellers.
  • According to an example not forming part of the invention, the outlet of the overhung impeller 11 of the first unit 10 is fluidly connected to the inlet of the second unit 20, thus forming a another multi stage compression unit. This configuration is represented in Figure 1 by means of dashed line 30 which represent the hydraulic connection between the units.
  • In this configuration, the first unit 10 provides the gas flow rate to the second unit 20 thus obtaining a compression unit apt to elaborate large flow rates with an high overall compression rate.
  • According to an example not forming part of the present invention not shown in the drawings, the first unit 10 comprises an overhung impeller 11 which is connected to said first driver shaft 3 by means of a gear arrangement, instead that flanged to said first driver shaft.
  • According to an embodiment of the present invention shown in Figure 2, the first unit 10 comprises a beam compressor.
  • Typical beam compressor casing rating varies from ANSI 600 to API 15000.
  • The inlet of the beam compressor is hydraulically connected to the outlet of the second unit 20. According to this arrangement, the first unit 10 receives the flow rate coming from the output of the second unit 20, thus forming a first multi stage compression unit allowing to reach higher compression rates. The hydraulic connection between the first 10 and the second 20 unit is represented in Figure 2 by means of the dashed line 50.
  • The compression unit according to the present invention therefore solves the drawbacks afflicting the prior art.
  • One of the results achieved with the compression unit according to the present invention is to reduce the footprint of the apparatus, with an extremely versatile configuration.

Claims (7)

  1. Compression unit (1) for supplying high and low pressure services to a plant comprising a single driver (2) associated with two driver shaft-ends (3, 4) projecting apart from said driver (2), a first driver shaft end (3) and a second driver shaft end (4), a first unit (10) being directly operatively connected to the first driver shaft-end (3) and a second unit (20) being operatively connected to the second driver shaft-end (4), wherein said second unit (20) is an integrally geared-compressor arrangement comprising a bull gear (21) and a plurality of pinions engaged with the bull gear (21), wherein the diameter of the bull gear (21) is larger than the diameter of the pinions; characterized in that the first unit (10) is directly connected to the first driver shaft-end (3) by a flexible coupling and the bull gear (21) is connected to the second driver shaft-end (4) by a flexible coupling; and in that said first unit (10) is an overhung impeller and the inlet of said first unit (10) is fluidly connected to the outlet of said second unit (20) thus forming a first multi stage compression unit.
  2. Compression unit (1) according to claim 1, wherein the integrally geared-compressor arrangement comprises at least one driven shaft (22, 23).
  3. Compression unit (1) according to claim 2, wherein at the opposite ends of said at least one driven shaft (22, 23) are provided overhung impellers (22a, 22b, 23a, 23b).
  4. Compression unit (1) according to claim 2 or claim 3, wherein said bull gear (21) comprises two driven shafts (22, 23), a first driven shaft (22) and a second driven shaft (23), each of said first (22) and second (23) driven shaft being provided at its ends with a couple of overhung impellers, respectively first overhung impellers (22a, 22b) and second overhung impellers (23a, 23b).
  5. Compression unit (1) according to claim 4, wherein said first overhung impellers (22a, 22b) and second overhung impellers (23a, 23b) are fluidly connected thus forming a second multi stage compression unit.
  6. Compression unit (1) according to one or more of the preceding claims, wherein said driver shaft-ends (3, 4) are the ends of a single driver shaft.
  7. Compression unit (1) according to claim 4 or claim 5, wherein the two driven shafts (22,23) are configured to rotate at different rotary speeds.
EP15801858.0A 2014-12-16 2015-11-30 Compression unit for high and low pressure services Active EP3234370B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20142145 2014-12-16
PCT/EP2015/078072 WO2016096386A1 (en) 2014-12-16 2015-11-30 Compression unit for high and low pressure services

Publications (2)

Publication Number Publication Date
EP3234370A1 EP3234370A1 (en) 2017-10-25
EP3234370B1 true EP3234370B1 (en) 2024-02-21

Family

ID=52574277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15801858.0A Active EP3234370B1 (en) 2014-12-16 2015-11-30 Compression unit for high and low pressure services

Country Status (6)

Country Link
US (1) US20170356451A1 (en)
EP (1) EP3234370B1 (en)
JP (1) JP2018503766A (en)
CN (1) CN107429702A (en)
DK (1) DK3234370T3 (en)
WO (1) WO2016096386A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800000620A1 (en) * 2018-01-08 2019-07-08 Nuovo Pignone Tecnologie Srl AMMONIA PRODUCTION PLANT
EP3617519A1 (en) * 2018-08-27 2020-03-04 Siemens Aktiengesellschaft Radially compressor rotor, radial compressor, gear-driven compressor
EP4224015A1 (en) * 2022-02-07 2023-08-09 Siemens Energy Global GmbH & Co. KG Hydrogen compressors
CN117905711B (en) * 2024-03-20 2024-07-23 江苏海拓宾未来工业科技集团有限公司 Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809493A (en) * 1970-06-08 1974-05-07 Carrier Corp Interchangeable compressor drive
CN102979751A (en) * 2012-09-25 2013-03-20 西安交大赛尔机泵成套设备有限责任公司 Single-shaft plusing multiple-shaft type carbon dioxide gas centrifugal compressor unit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202295A (en) * 1922-08-12 1924-06-05 Bbc Brown Boveri & Cie Improvements in multi-stage centrifugal compressors
CA2058395A1 (en) * 1991-12-23 1993-06-24 Clayton Bear Axial inlet beam-type compressor
DE4416497C1 (en) * 1994-05-10 1995-01-12 Gutehoffnungshuette Man Geared multi-shaft turbo-compressor and geared multi-shaft radial expander
JP3457828B2 (en) * 1997-03-05 2003-10-20 三菱重工業株式会社 Compressor and gas expander device
EP2083172A1 (en) * 2008-01-22 2009-07-29 Siemens Aktiengesellschaft Multi-body compressor train
CN101435428B (en) * 2008-12-22 2010-11-03 重庆朝阳气体有限公司 High and low pressure operation double-mode double-cylinder centrifugal type oxygen pressure machine
IT1399171B1 (en) * 2009-07-10 2013-04-11 Nuovo Pignone Spa HIGH PRESSURE COMPRESSION UNIT FOR INDUSTRIAL PLANT PROCESS FLUIDS AND RELATED OPERATING METHOD
US20110097225A1 (en) * 2009-10-28 2011-04-28 Freund Sebastian W Air compression and expansion system with single shaft compressor and turbine arrangement
US20150211539A1 (en) * 2014-01-24 2015-07-30 Air Products And Chemicals, Inc. Systems and methods for compressing air

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809493A (en) * 1970-06-08 1974-05-07 Carrier Corp Interchangeable compressor drive
CN102979751A (en) * 2012-09-25 2013-03-20 西安交大赛尔机泵成套设备有限责任公司 Single-shaft plusing multiple-shaft type carbon dioxide gas centrifugal compressor unit

Also Published As

Publication number Publication date
DK3234370T3 (en) 2024-04-08
EP3234370A1 (en) 2017-10-25
CN107429702A (en) 2017-12-01
JP2018503766A (en) 2018-02-08
US20170356451A1 (en) 2017-12-14
WO2016096386A1 (en) 2016-06-23

Similar Documents

Publication Publication Date Title
CN102893032B (en) Multi-stage gear formula compressor
US8939732B2 (en) Multi-stage compressor
EP3099939B1 (en) Two-stage centrifugal pump
US20170356451A1 (en) Copmpression unit for high and low pressure services
CN105485022B (en) Sectional multi-stage centrifugal pump
EP3443227B1 (en) Integrally geared compressor having a combination of centrifugal and positive displacement compression stages
US20210324866A1 (en) An individual axis driven three stage counter rotating axial flow pump
EP2604862A1 (en) A compressor arrangement
CN104564833A (en) guide vane assembly, centrifugal compressor and air conditioner
CN211874764U (en) A large flow and high full pressure reloaded centrifugal cross-flow fan
CN106574626A (en) Compressor system
EP3517729B1 (en) A multi-stage radial turboexpander
JP2025138887A (en) Integral gear compressor with axial compressor unit and method
JP2015190383A (en) Centrifugal compressor and multistage compressor device
JP2015059493A (en) Rotating machine
DE102011054236A1 (en) Method and device for driving a turbocharger
KR20260041116A (en) Integrated geared turbomachine system having at least two impellers with different rotational speeds
RU2418988C1 (en) Turbo-pump unit
JP6049807B2 (en) Centrifugal compressor
CH262885A (en) Centrifugal compressor for high stage pressure ratio.
DE4435280A1 (en) Downstream guide equipment for radial steam turbomachinery

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170717

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20191112

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NUOVO PIGNONE TECNOLOGIE - S.R.L.

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230526

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20231123

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602015087639

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

Effective date: 20240405

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240621

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240522

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1659342

Country of ref document: AT

Kind code of ref document: T

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240521

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240521

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240621

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240522

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240621

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240621

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602015087639

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

26N No opposition filed

Effective date: 20241122

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20241130

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20241130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20241130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20241130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20251022

Year of fee payment: 11

REG Reference to a national code

Ref country code: CH

Ref legal event code: U11

Free format text: ST27 STATUS EVENT CODE: U-0-0-U10-U11 (AS PROVIDED BY THE NATIONAL OFFICE)

Effective date: 20251201

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20251022

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20251022

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NO

Payment date: 20251024

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DK

Payment date: 20251022

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20251023

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20251201

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20151130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20151130