CN104624575B - Method for flushing hydraulic pipe oil through hydraulic power unit equipment - Google Patents
Method for flushing hydraulic pipe oil through hydraulic power unit equipment Download PDFInfo
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- CN104624575B CN104624575B CN201310547260.6A CN201310547260A CN104624575B CN 104624575 B CN104624575 B CN 104624575B CN 201310547260 A CN201310547260 A CN 201310547260A CN 104624575 B CN104624575 B CN 104624575B
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- flushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a method for flushing hydraulic pipe oil through hydraulic power unit equipment. The method is applicable to off-line acid pickling and stainless steel pipes. The pressure, flow velocity and flow of the hydraulic power unit equipment are matched with a device pipe to be flushed in the design process. The method is characterized by comprising the steps of preparation before hydraulic pipe oil flushing, main hydraulic pipe flushing, branch hydraulic pipe flushing and oil sample detection. The method for flushing the hydraulic pipe oil through the hydraulic power unit equipment has the advantages that the flow, pressure and flow velocity of the oil flushing equipment are matched with those of the device pipe to be flushed, the oil cleanliness which is originally designed in the NAS7 grade is improved to be higher than the NAS5 grade, the construction period is shortened, and the economical benefit is remarkable.
Description
Technical field
The present invention relates to a kind of conduit under fluid pressure oil flushing method, is that one kind is carried out using hydraulic power unit equipment specifically
Conduit under fluid pressure oil flushing method.
Background technology
Conduit under fluid pressure oil flushing is a vital operation in conduit under fluid pressure installation process, and its quality is directly affected
Debugging, reliability to whole hydraulic system, service life.But the flushing pumping plant that known conduit under fluid pressure oil flushing is used with will
Flusher pipeline is all difficult matching in flow velocity, flow, pressure, causes washing time length, quality unstable, flushing oil consumption
Greatly, it is costly.
Therefore it is known rinse pumping plant there are problems that in conduit under fluid pressure oil flushing above-mentioned a variety of inconvenience and.
The content of the invention
The purpose of the present invention, is the stream for proposing a kind of hydraulic power unit equipment in design and wanting service unit system pipeline
The utilization hydraulic power unit equipment that speed, flow, pressure match carries out conduit under fluid pressure oil flushing method.
It is another object of the present invention to propose a kind of number of times for making fluid wash away in inner-walls of duct and by filter
Utilization hydraulic power unit equipment more than cycle-index carries out conduit under fluid pressure oil flushing method.
For achieving the above object, technical solution of the invention is：
One kind carries out conduit under fluid pressure oil flushing method using hydraulic power unit equipment, it is adaptable to offline pickling and stainless steel tube
Road, hydraulic power unit capital equipment includes:Variable pump（Main pump）, screw pump（Auxiliary pump）, fuel tank, internal circulation filtering device, plate-type heat-exchange
Device, heater, outlet filter, oil return house steward filter and automatic PLC control system composition.Equipment hydraulic power unit is by two big systems
System composition is with the dynamical system of the compositions such as variable pump, outlet filter, oil return house steward's filter, plate type heat exchanger；By screw pump,
Internal circulation filtering device etc. constitutes internal circulation system, shares a fuel tank and heater.Its every technical data is by the device for servicing
System size is different, and main pump is by 2 to multiple stage；Auxiliary pump is general 2, and main pump is different with engineering machinery by engineering, general work
Cheng Duoyong variable radial-plunger pumps.It is of different sizes due to service unit system, therefore；Cannot accomplish economic and practical in pressure
Power, flow velocity, flow can meet the oil flushing equipment of needs.And utilize hydraulic power unit equipment its pressure, flow velocity, stream in design
Amount matches characteristic with the apparatus system to be serviced, it is characterised in that comprise the following steps：
Preparation before a, conduit under fluid pressure oil flushing, comprises the steps of：
（1）Thick flushing and fine are washed and all use body pump；Segmentation, burst are changed to into overall flushing；
（2）Pipeline entirety connecting leg, ＞ DN50 pipes will be blown clean using compressed air in pipe；＜ DN50 pipes adopt SF-600 gas
Dynamic duct cleaning rifle clears up inside pipe wall；
（3）The first step is done using working oil to rinse：First kick-off valve platform, rinses all pipelines；
（4）Second step is done using working oil to rinse：The first step rinse it is up to standard after, band upper valve platform carry out second flushing from
Valve platform is to each actuator pipeline；
B, conduit under fluid pressure main pipeline are rinsed, and are comprised the steps of：
（1）Close the valve of all valve platforms；
（2）Open hydraulic power unit P pipes（Pipeline at from main pump to hydraulic valve platform）, T pipes valve（From hydraulic valve platform to oil return
House steward's filter pipes）；
（3）Supervisor's leakage situation is checked, if leakage, termination of pumping occur processing；
（4）Supervisor's valve of opening valve platform, and leak check situation successively；
（5）Being then turned on two main pumps in addition carries out supervisor's flushing, and its pipeline pressure should not such as be reached appropriate in 2.0MPa
Adjustment pressure, and decide whether to be then turned on a pump depending on pressure condition；
（6）After rinsing 4 hours～6 hours supervisor is tapped with soft hammer, especially commissure and pipeline turning
Place；
C, conduit under fluid pressure branch pipe(tube) are rinsed, and are comprised the steps of：
（1）Under stopped status, P, T nipple of valve platform is blocked with blind plate；
（2）2 main pumps are opened, successively supervisor's valve and arm valve of opening valve platform, to each arm leakage inspection is carried out
Look into；
（3）2 main pumps are then turned in addition to be rinsed, and suitably adjust pressure depending on pipe network liquid resistance situation；
（4）After rinsing 4 hours or 6 hours arm is tapped with soft hammer, especially commissure and pipeline turning
Place；
D, oil sample detection
NAS is adopted using on-line checking standard；Rinse luboil cleanness and press design requirement.
The utilization hydraulic power unit equipment of the present invention carries out conduit under fluid pressure oil flushing method can also be arranged using following technology
Apply further to realize.
Aforesaid method, wherein in step a, oil return house steward filter element precision 22um when the first step is rinsed, Hydraulic Station
Interior circulation oil return house steward filter element precision 7um.
Aforesaid method, wherein in step a, oil return house steward filter element precision 10um when second step is rinsed, Hydraulic Station
Interior circulation oil return house steward filter element precision 5um.
Aforesaid method, wherein in step b, supervisor's washing time is defined by cleannes, but most short must not be less than 36
Hour.
Aforesaid method, wherein in step b, Oil-temperature control is at 60～70 DEG C in flushing process.
Aforesaid method, wherein in step b, oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C,
When fuel tank heater can not meet above oil temperature, high pressure kicks heating can be carried out with a main pump, oil return pipe temperature is checked at any time.
Aforesaid method, wherein in step b, checked per 2 hours a luboil cleanness in flushing process, and noted
Filter passes in and out pressure reduction variation tendency.
Aforesaid method, wherein in step b, if filter element, oil in filter cartridge must be changed in flushing process
Liquid does waste oil disposal.
Aforesaid method, wherein in step c, arm washing time is defined by cleannes, but most short must not be less than 72
Hour.
Aforesaid method, wherein in step c, Oil-temperature control is at 60～70 DEG C in flushing process；
Aforesaid method, wherein in step c, oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C,
When fuel tank heater can not meet above oil temperature, high pressure kicks heating can be carried out with a main pump, oil return pipe temperature is checked at any time.
Aforesaid method, wherein in step c, all proportions valve installs rinsing plate, notes the protection of comparative example valve, and
Washing time is no less than 36 hours.
After above-mentioned technical proposal, the utilization hydraulic power unit equipment of the present invention carries out conduit under fluid pressure oil flushing method to be had
Advantages below：
1st, oil flushing equipment is made to match on flow, pressure, flow velocity with flusher pipeline is wanted；
2nd, luboil cleanness is improved from original design NAS7 levels, actually reach more than NAS5 levels；
3rd, reduction of erection time, remarkable in economical benefits.
Specific embodiment
The present invention is illustrated further with reference to embodiments.
Embodiment 1
The utilization hydraulic power unit equipment of the present invention carries out conduit under fluid pressure oil flushing method, and hydraulic power unit capital equipment includes:
Variable pump（Main pump）, screw pump（Auxiliary pump）, fuel tank, internal circulation filtering device, plate type heat exchanger, heater, outlet filter, oil return
House steward's filter and automatic PLC control system are constituted.Equipment hydraulic power unit is made up of with variable pump, egress filtering two big systems
The dynamical system of the compositions such as device, oil return house steward's filter, plate type heat exchanger；Follow in being made up of screw pump, internal circulation filtering device etc.
Loop systems, share a fuel tank and heater.Its every technical data is different by the device size of service, and main pump is by 2
To multiple stage；, typically by 2, main pump is different with engineering machinery by engineering, the multiplex variable radial-plunger pump of common engineering for auxiliary pump.Due to
Service unit it is of different sizes, therefore；The economic and practical oil punching that needs can be met in pressure, flow velocity, flow cannot be accomplished
Wash equipment.And the utilization hydraulic power unit equipment of the present invention its pressure, flow velocity, flow and the apparatus system phase to be serviced in design
Matching properties, hydraulic power unit equipment its pressure, flow velocity, flow in design match with installing pipes of being serviced, its feature
It is to comprise the following steps：
Preparation before a, conduit under fluid pressure oil flushing, comprises the steps of：
（1）Thick flushing and fine are washed and all use body pump；Segmentation, burst are changed to into overall flushing；
（2）Pipeline entirety connecting leg, ＞ DN50 pipes will be blown clean using compressed air in pipe；Purging Stress control exists
0.3MPa, ＜ DN50 pipes are using SF-600 Pneumatic pipes cleaning rifle cleaning inside pipe wall；
（3）The first step is done using working oil to rinse：First kick-off valve platform, rinses all pipelines；Oil return is total when the first step is rinsed
Pipe filter element precision 22um, internal circulation of hydraulic station oil return house steward filter element precision 7um；
（4）Second step is done using working oil to rinse：After first step flushing is up to standard, band upper valve platform carries out second flushing,
Oil return house steward filter element precision 10um, internal circulation of hydraulic station oil return house steward filter element precision 5um when second step is rinsed, thus will
Thick flushing and fine are washed and united two into one, and are only divided into two steps.
B, conduit under fluid pressure main pipeline are rinsed, and are comprised the steps of：
（1）Close the valve of all valve platforms；
（2）Open hydraulic power unit P pipes（Pipeline at from main pump to hydraulic valve platform）, T pipes valve（From hydraulic valve platform to oil return
House steward's filter pipes）；
（3）Supervisor's leakage situation is checked, if leakage, termination of pumping occur processing；
（4）Supervisor's valve of opening valve platform, and leak check situation successively；
（5）Being then turned on two main pumps in addition carries out supervisor's flushing, and suitably adjusts pressure, and decides whether depending on pressure condition
It is then turned on a pump；
（6）After rinsing 4 hours～6 hours supervisor is tapped with soft hammer, especially commissure and pipeline turning
Place；
Wherein：When conduit under fluid pressure main pipeline is rinsed, supervisor's washing time is defined by cleannes, but it is most short must not be less than 36 little
When；Oil-temperature control is at 60～70 DEG C in flushing process；Oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C, in oil
When case heater can not meet above oil temperature, high pressure kicks heating can be carried out with a main pump, oil return pipe temperature is checked at any time；Punching
During washing per 2 hours check a luboil cleanness（Including fuel tank）, and notice that filter passes in and out pressure reduction variation tendency；It is flushed
If must change filter element in journey, filter cartridge inner fluid does waste oil disposal.
C, conduit under fluid pressure branch pipe(tube) are rinsed, and are comprised the steps of：
（1）Under stopped status, P, T nipple of valve platform is blocked with blind plate；
（2）2 main pumps are opened, successively supervisor's valve and arm valve of opening valve platform, to each arm leakage inspection is carried out
Look into；
（3）2 main pumps are then turned in addition to be rinsed, and suitably adjust pressure depending on pipe network liquid resistance situation（With a liter high pressure
Based on）；
（4）After rinsing 4 hours or 6 hours arm is tapped with soft hammer, especially commissure and pipeline turning
Place；
Wherein：When conduit under fluid pressure branch pipe(tube) is rinsed, arm washing time is defined by cleannes, but it is most short must not be less than 72 little
When；Oil-temperature control is at 60～70 DEG C in flushing process；Oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C, in oil
When case heater can not meet above oil temperature, high pressure kicks heating can be carried out with a main pump, oil return pipe temperature is checked at any time；Institute
Proportional valve installs rinsing plate, notes the protection of comparative example valve, and washing time must not be less than 36 hours.
D, oil sample detection adopt NAS using on-line checking standard；Rinse luboil cleanness and press design requirement.
The situation of change of luboil cleanness in each time segment pipe can intuitively be reflected very much during oil flushing, directly
To completing whole conduit under fluid pressure oil flushing.
The utilization hydraulic power unit equipment that the present invention has substantive distinguishing features and significant technological progress, the present invention carries out hydraulic pressure
Pipe-line oil purging method solve in the past construction oil flushing equipment with want flusher pipeline in flow, pressure, flow velocity not
The problem matched somebody with somebody, duration shortening, remarkable in economical benefits.
The utilization hydraulic power unit equipment of the present invention carries out conduit under fluid pressure oil flushing method in cigarette treasured 460 tube rolling engineering, 6 liquid
Implement its effect in the oil flushing of pressure station as follows：
1st, the duration
Average each Hydraulic Station of plan is rinsed 12 days using traditional method, 6 Hydraulic Stations 72 days, and adopt the method altogether
With 33 days, shorten 39 days, each Hydraulic Station rinses average shortening 6.5 days.
2nd, quality
Luboil cleanness is actually reached more than NAS5 levels from original design NAS7 levels.
3rd, economic benefit
1., washed using body pump impulse and do not using flushing oil；Directly use work oil flushing.6 Hydraulic Stations can be with fuel-economizing 32#
Antiwear hydraulic oil 72t, with 8000 yuan/t, can save 576000 yuan.
, oil flushing equipment；Freight charges（Haul distance Shanghai is to Yantai）, equipment leasing expense is in terms of 72 days；Calculate by 900 yuan/day,
40000（Freight charges）+64800（Equipment leasing expense）=104800 yuan, the idleness of equipment is not charged to.
, shorten activity time 39 days；In terms of 6 people, 200 yuan/day per capita；39 days=46800 yuan.
, amount to save 727600 yuan.
Above example is used for illustrative purposes only, rather than limitation of the present invention, about the technology people of technical field
Member, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, all equivalents
Technical scheme should also belong to scope of the invention, should be limited by each claim.
Claims (12)
1. one kind carries out conduit under fluid pressure oil flushing method using hydraulic power unit equipment, it is adaptable to the offline pickling of conduit under fluid pressure and stainless
Steel conduit is rinsed, and hydraulic power unit capital equipment includes:Variable pump, screw pump, fuel tank, internal circulation filtering device, plate type heat exchanger, plus
Hot device, outlet filter, oil return house steward filter and automatic PLC control system, equipment hydraulic power unit is made up of two big systems, with
The dynamical system that variable pump, outlet filter, oil return house steward's filter, plate type heat exchanger are constituted；By screw pump, internal circulation filtering
Device constitutes internal circulation system, shares a fuel tank and heater, and its every technical data is each not by the apparatus system size of service
Identical, variable pump is by 2 to multiple stage；Screw pump is general 2, and variable pump is different with engineering machinery by engineering, and common engineering is multiplex
Variable radial-plunger pump, using hydraulic power unit equipment design when its pressure, flow velocity, flow and the apparatus system phase to be serviced
With characteristic, it is characterised in that comprise the following steps：
Preparation before a, conduit under fluid pressure oil flushing, comprises the steps of：
（1）Thick flushing and fine are washed and all use body pump；Segmentation, burst are changed to into overall flushing；
（2）Pipeline entirety connecting leg, ＞ DN50 pipes will be blown clean using compressed air in pipe, and purging Stress control is in 0.3MPa；＜
DN50 pipes are using SF-600 Pneumatic pipes cleaning rifle cleaning inside pipe wall；
（3）The first step is done using working oil to rinse：First kick-off valve platform, rinses all pipelines；
（4）Second step is done using working oil to rinse：After first step flushing is up to standard, band upper valve platform carries out second flushing from control
Valve platform is to each actuator pipeline；
B, conduit under fluid pressure main pipeline are rinsed, and are comprised the steps of：
（1）Close the valve of all valve platforms；
（2）Open hydraulic power unit from variable pump to hydraulic valve platform at pipeline, from hydraulic valve platform to oil return house steward's filter pipes
Valve, starts a variable pump；
（3）Supervisor's leakage situation is checked, if leaking, termination of pumping is processed；
（4）Supervisor's valve of opening valve platform, and leak check situation successively；
（5）Being then turned on a variable pump carries out supervisor's flushing, and its pipeline pressure should not such as reach appropriate adjustment pressure in 2.0MPa
Power, and decide whether to be then turned on one or more variable pump depending on pressure condition；
（6）After rinsing 4 hours～6 hours supervisor is tapped with soft hammer, tapped at commissure and pipeline turning；
C, conduit under fluid pressure branch pipe(tube) are rinsed, and are comprised the steps of：
（1）Under stopped status, to valve platform from variable pump to hydraulic valve platform at pipeline, from hydraulic valve platform to oil return house steward filter
Device pipeline nipple is blocked with blind plate；
（2）2 variable pumps are opened, successively supervisor's valve and arm valve of opening valve platform, to each arm leak test is carried out；
（3）2 variable pumps are then turned in addition to be rinsed, and suitably adjust pressure in 2.0MPa depending on pipe network liquid resistance situation；
（4）After rinsing 4 hours or 6 hours arm is tapped with soft hammer, tapped at commissure and pipeline turning；
D, oil sample detection
Using on-line checking, standard adopts NAS；Rinse luboil cleanness and press design requirement.
2. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step a, with 22 μm, internal circulation of hydraulic station oil return house steward's filter element precision is with 7 μm for oil return house steward's filter element precision when the first step is rinsed.
3. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step a, with 10 μm, internal circulation of hydraulic station oil return house steward's filter element precision is with 5 μm for oil return house steward's filter element precision when second step is rinsed.
4. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step b, supervisor washing time be defined by cleannes, but most it is short must not be less than 36 hours.
5. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step b, Oil-temperature control is at 60～70 DEG C in flushing process.
6. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step b, oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C, in fuel tank heater above oil temperature can not be met
When, high pressure kicks heating is carried out with a main pump, oil return pipe temperature is checked at any time.
7. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step b, in flushing process per 2 hours check a luboil cleanness, and note filter pass in and out pressure reduction variation tendency.
8. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step b, if must change filter element in flushing process, filter cartridge inner fluid does waste oil disposal.
9. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that described
In step c, arm washing time is defined by cleannes, but most it is short must not be less than 72 hours.
10. as claimed in claim 1 conduit under fluid pressure oil flushing method is carried out using hydraulic power unit equipment, it is characterised in that institute
In stating step c, Oil-temperature control is at 60～70 DEG C in flushing process.
11. carry out conduit under fluid pressure oil flushing method using hydraulic power unit equipment as claimed in claim 1, it is characterised in that institute
In stating step c, oil temperature is not less than 50 DEG C in flushing process, if oil temperature is less than 50 DEG C, can not meet to oil in fuel tank heater
Wen Shi, with a main pump high pressure kicks heating is carried out, and oil return pipe temperature is checked at any time.
12. carry out conduit under fluid pressure oil flushing method using hydraulic power unit equipment as claimed in claim 1, it is characterised in that institute
In stating step c, all proportions valve installs rinsing plate, notes the protection of comparative example valve, and washing time is no less than 36 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547260.6A CN104624575B (en) | 2013-11-08 | 2013-11-08 | Method for flushing hydraulic pipe oil through hydraulic power unit equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547260.6A CN104624575B (en) | 2013-11-08 | 2013-11-08 | Method for flushing hydraulic pipe oil through hydraulic power unit equipment |
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| CN104624575A CN104624575A (en) | 2015-05-20 |
| CN104624575B true CN104624575B (en) | 2017-04-19 |
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| CN105798024B (en) * | 2016-05-11 | 2018-02-16 | 广西玉柴机器配件制造有限公司 | The normal temperature cleaning method of heavy duty diesel engine pulse water-cooling exhaust pipe |
| CN108723020A (en) * | 2017-04-25 | 2018-11-02 | 中国二十冶集团有限公司 | High-pressure aerated turbulent flow fluid pressure line oil flushing equipment and its application method |
| CN106964612B (en) * | 2017-05-26 | 2019-07-09 | 中国二十冶集团有限公司 | Hydraulic pipeline oil flushing method |
| CN108262314A (en) * | 2018-01-17 | 2018-07-10 | 山东钢铁集团日照有限公司 | Hydraulic pipeline high-efficiency rinsing method |
| CN113560279B (en) * | 2021-04-29 | 2023-08-15 | 江苏核电有限公司 | Nuclear power station diesel system pipeline low-temperature environment oil cleaning system and process thereof |
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| DE4125315A1 (en) * | 1991-07-31 | 1993-02-04 | Oertzen Arndt H Gmbh & Co | Equipment for cleaning water pipes etc. - delivers alternate water and air pulses from injector pump whose mixer tube is uncovered as float controlled water level drops in container |
| EP0864378A1 (en) * | 1997-03-14 | 1998-09-16 | Walter Lippuner | Cleaning device for oil ducts |
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| CN101543825A (en) * | 2009-03-30 | 2009-09-30 | 中国第一冶金建设有限责任公司 | Closed self-circulation hydraulic pipeline flusher |
| CN102371259A (en) * | 2010-08-18 | 2012-03-14 | 中冶天工集团有限公司 | On-line oil washing process for hydraulic pipeline |
| GB2495309A (en) * | 2011-10-05 | 2013-04-10 | Paradigm Flow Services Ltd | A method of and system for cleaning a fire main associated with a deluge system |
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|---|---|---|---|---|
| DE4125315A1 (en) * | 1991-07-31 | 1993-02-04 | Oertzen Arndt H Gmbh & Co | Equipment for cleaning water pipes etc. - delivers alternate water and air pulses from injector pump whose mixer tube is uncovered as float controlled water level drops in container |
| EP0864378A1 (en) * | 1997-03-14 | 1998-09-16 | Walter Lippuner | Cleaning device for oil ducts |
| CN1654134A (en) * | 2004-02-10 | 2005-08-17 | 上海外高桥造船有限公司 | Oil casting and flushing technique for hydraulic piping system |
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| GB2495309A (en) * | 2011-10-05 | 2013-04-10 | Paradigm Flow Services Ltd | A method of and system for cleaning a fire main associated with a deluge system |
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| CN104624575A (en) | 2015-05-20 |
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