GB2567416A - Apparatus for delivering resinous lining material to a pipeline - Google Patents

Apparatus for delivering resinous lining material to a pipeline Download PDF

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Publication number
GB2567416A
GB2567416A GB1715033.5A GB201715033A GB2567416A GB 2567416 A GB2567416 A GB 2567416A GB 201715033 A GB201715033 A GB 201715033A GB 2567416 A GB2567416 A GB 2567416A
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GB
United Kingdom
Prior art keywords
mixed resin
conduit
supply line
injection head
air supply
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.)
Granted
Application number
GB1715033.5A
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GB201715033D0 (en
GB2567416B (en
Inventor
Talbot Christopher Richard
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.)
Pipeline Testing Consultants Ltd
Original Assignee
Pipeline Testing Consultants Ltd
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Filing date
Publication date
Application filed by Pipeline Testing Consultants Ltd filed Critical Pipeline Testing Consultants Ltd
Priority to GB1715033.5A priority Critical patent/GB2567416B/en
Publication of GB201715033D0 publication Critical patent/GB201715033D0/en
Publication of GB2567416A publication Critical patent/GB2567416A/en
Application granted granted Critical
Publication of GB2567416B publication Critical patent/GB2567416B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/162—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed
    • B05B7/1626—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed at the moment of mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3093—Recirculation valves, i.e. the valve element opens a passage to the nozzle and simultaneously closes at least partially a return passage the feeding means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Apparatus for delivering a resinous lining to a pipeline (1 figure 1) comprises an injection head 2 with a nozzle 13 that is used to inject a mixed resin into an airstream and to deliver the mixed resin/air flow to a delivery hose (3 figure 1). The injection head comprises an air supply conduit 7 and a mixed resin supply line 16 wherein, mixed resin issuing from the supply line is injected into an air stream for delivery to the pipeline via the nozzle. A baffle 18, preferably in the form of a helical flight, is located within the air supply conduit. The baffle promotes turbulence within the airstream thereby preventing mixed resin remnants from sticking to and clogging the injection head. Advantageously, the mixed resin supply line is located, at least partially, within the air supply conduit. As the air stream within the conduit is temperature controlled, the airstream acts to keep the mixed resin within the supply line at an appropriate temperature for delivery from the injection head for application to the interior of the pipeline so that no additional external heating apparatus is required for the supply line.

Description

APPARATUS FOR DELIVERING RESINOUS LINING MATERIAL TO A PIPELINE
The present invention relates to an apparatus for delivering resinous lining material to a pipeline.
Utility pipelines such as those used to carry gas and water supplies are usually buried underground and therefore difficult to access for repair and maintenance work. They are also susceptible to corrosion over time. It is therefore usual to cover the interior surface of the pipeline with an impermeable lining material in order to extend the life of the pipeline. Such lining material is typically a resin that is sprayed over the interior surface of the pipeline in a liquid form and that then cures to form the impermeable lining. The liquid resin is usually supplied from an injection head exterior to the pipeline to a rotary sprayer that is mounted on a small carriage or sledge, which is moved along inside the pipeline and sprays the resin onto the inner pipe surface.
The liquid resin is typically supplied to the injection head as a mixed resin from a mixing block to which the components of the resin are separately supplied. This is because until the component of the resin are mixed they can be retained in a liquid form but once mixed they react chemically and start to cure. However, a mixed resin can be retained in liquid form for a sufficient time period that allows it to be applied prior to curing provided that the temperature of the mixed resin is carefully controlled. For example, polyurethane resins, which are those that are now typically used for lining pipelines, cure in around 4 minutes but can be retained in a liquid form provided that they are retained at a temperature of around 4O°C. Hence, it is critical that the temperatures of the mixed resin and its components prior to mixing are carefully controlled up to the point of application so that the mixed resin does not begin to cure within the injection head or supply lines thereto. Conventionally, therefore, the supply lines for the mixed resin and its components are externally heated. Even with this precaution it has been found difficult to prevent some mixed resin from curing within the injection head. This is usually a remnant left at the end of a lining operation. Such cured remnants tend to clog the head and impair its further operation until it is cleaned. Cleaning is a difficult procedure that involves the use of powerful solvents for the cured resin residues. These solvents have the disadvantage that they can cause damage to plastics parts and seals so that in time the integrity of the injection head is compromised.
An object of the present invention is to overcome or substantially mitigate the aforementioned problems
According to the present invention there is provided apparatus for delivering a resinous lining material to a pipeline comprising an injection head with a nozzle, an air supply conduit and a mixed resin supply line wherein, in use, mixed resin issuing from the supply line is injected into an airstream issuing from the air supply conduit for delivery to the pipeline via the nozzle, a baffle being located within the air supply conduit that, in use, promotes turbulence within the airstream issuing from the conduit.
It has been found that turbulence within the airstream issuing from the air supply conduit impedes mixed resin from sticking to and clogging the interior of the injection head.
Preferably, the baffle comprises a helical flight, preferably with a longitudinal axis that is coincident with a longitudinal axis of that portion of the air supply conduit in which it is located. The use of a helical flight as the baffle promotes a spiral airflow that improves the flow of mixed resin to the nozzle resulting in a more even coating in the pipeline.
Preferably also, the mixed resin supply line is located, at least partially, within the air supply conduit. As the airstream within the conduit is temperature controlled, this has the advantageous effect that the airstream acts to keep the mixed resin within the supply line at an appropriate temperature for delivery from the injection head for application to the interior of the pipeline. Hence, no additional external heating apparatus is required for the supply line.
Other preferred but non-essential features of the various aspects of the present invention are described in the dependent claims appended hereto.
The present invention will now be described by way of example with reference to the accompanying drawings, in which:Fig. 1 is a diagram showing apparatus for use in the delivery of a resinous lining material to a pipeline;
Fig. 2 is a schematic representation of an injection head in accordance with the present invention and forming part of the apparatus shown in Fig. 1;
Fig. 3 is schematic representation of an arrangement of pathways and valves through a mixing block comprising part of the injection head shown in Fig. 2; and
Fig. 4 is a schematic representation of a pair of L-port valves also comprising part of the injection head shown in Fig. 2.
An example of an apparatus for use in the supply of a resinous lining material to a pipeline 1 is shown in Fig. 1. The apparatus comprises an injection head 2, as is described in more detail below with reference to Fig. 2, that is used to inject a mixed resin into an airstream and to deliver the mixed resin/air flow to a mixed resin delivery hose 3. The hose 3 supplies the mixed resin/air mixture to a rotary sprayer (not shown) located within the pipeline
1. The mixed resin is injected into the airstream within the injection head 2 and is supplied thereto in component form down two unmixed resin delivery hoses 4 respectively from two separate tanks 5 by a pump 6. Similarly, the injection head 2 is adapted for connection to an air supply conduit 7. In the present example and as shown in Fig. 1, the air is supplied as compressed air from a compressor 8. The supply of mixed resin/air by the injector head 1 in this arrangement is therefore by positive air pressure. However, in an alternative arrangement, a negative air pressure applied to an outlet 9 of the injection head 2 can be used to suck air through the injection head 2 from the conduit 7. The injection head 2 of the invention will operate equally in both modes and in both cases an inlet 10 of conduit 7 is connected to a heat exchanger 11 whereby air entering the conduit 7 is heated to a temperature dependent on the curing temperature of the mixed resin. In the case of a polyurethane resin, this temperature is such that at the point of injection of the mixed resin by the airstream within the injection head 2, the temperature of the airstream is of the order of 4O°C. Also, prior to entering the conduit 7 and the heat exchanger 11, the air is desiccated by being passed through a dryer 12. This ensures that moisture in the air that would affect the curing of the mixed resign is removed.
The structure of the injection head 2 as shown in Fig. 2, will now be described. The injection head 2 has a nozzle 13 that comprises the outlet 9 for connection to the mixed resin delivery hose 3. An inlet of the nozzle 13 is adapted to form one part 14 of a quick release coupling, the other part 15 of which is secured to an outlet of the air supply conduit 7 for the supply of pressurized air to the nozzle 13. Preferably, the part 14 of the coupling comprises a female part and the part 15 comprises a male part in order that the outlet of the conduit 7 can located within the part 15. The inlet of the nozzle 13 is also supplied with mixed resin via a mixed resin supply line 16. This supply line 16 does not need a connection to the nozzle 13 separate from the conduit 8 as at least a part of the supply line 16, in particular that adjacent its outlet, is located within the conduit 7 as shown in Fig. 2. In particular, the mixed resin supply line 16 is fed with two separate streams of fluid comprising two components of the mixed resin from a mixing block 17. Part way along the line 7 and close to the outlet from the mixing block 17 the supply line 16 passes into the conduit 7. Preferably, the supply line 16 is located along the longitudinal axis A of the conduit 7 such that their longitudinal axes are coincident. As the airstream within the conduit 7 is temperature controlled, this has the advantageous effect that the airstream acts to keep the mixed resin within the supply line 16 at an appropriate temperature for delivery from the injection head 2 for application to the interior of the pipeline 1. Hence, no additional external heating apparatus is required for the supply line 16, which is maintained at a stable temperature within the conduit 7 both during mixing and injection into the airflow within the nozzle 13. This is critical to the performance and curing of the resin and is an important advantage of the present invention.
Air travels along the conduit 7 from the heat exchanger 11 in primarily a linear flow. However, in a portion of the conduit 7 at its outlet and, preferably, adjacent its outlet this pattern is disrupted to create turbulence within the airstream issuing from the conduit 7. It has been found that the creation of such turbulence prevents mixed resin from sticking to the various parts of the injection head 2, such as the nozzle and coupling 14,15, through which the mixed resin/air mixture passes. This reduces clogging of the injection head 2 and facilitates cleaning.
Turbulence is created in the airstream within the conduit 7 by the provision of a baffle 18. In the illustrated embodiment the baffle 18 comprises a helical flight that preferably has a longitudinal axis coincident with the longitudinal axis A of that portion of the air supply conduit 7 in which it is located. However, in other embodiments of the invention, the baffle 18 may take other forms, for example a plurality of blades or flaps appropriately orientated within the conduit 7. However, the use of a helical flight as the baffle 18 is preferred because it promotes a spiral airflow that improves the flow of mixed resin to the connection nozzle 13 resulting in a more even coating in the pipeline 1. The helical flight 18 preferably comprises at least one complete revolution and is located around that portion of the mixed resin supply line 16 that is located within the conduit 7. Hence, in this section of the conduit 7 the longitudinal axes A of the conduit
7, the supply line 16 and the flight 18 are all coincident. Also, the spiral airflow around the supply line 16 ensures that the temperature of the mixed resin within the supply line is kept at an appropriate temperature, which for a polyurethane resin is around 4O°C.
The two separate streams of fluid entering the mixed resin supply line are mixed together as they pass along the supply line 16 by a static mixer 19 that is located along the length of the supply line 16. The static mixer 19 comprises a plurality of blades 20 located along the whole length of the supply line 16. These blades 20 continuously blend the two fluid streams as they pass along the supply line in order to achieve complete mixing prior to the egress of the mixed resin from the supply line 16 when it is injected into the airstream within the nozzle 13.
The supply line 16 and the blades 20 are preferably made of metal, advantageously stainless steel, as is the conduit 7 and the nozzle 13. Also, it will be appreciated that the injection head 2 comprises no moving parts. These features facilitate cleaning, as is described below.
The mixing block 17 that is used to supply the supply line 16 with the two components of the mixed resin is also of simple construction as will now be described with reference to Fig. 3. It will be seen that it comprises a block with two threaded inlets 21 for each of the resin components into two separate ducts 22 that join at a threaded outlet 23 from the block 17 to which outlet the inlet of the supply line 16 is connected. The two components of the resin are therefore kept separate within the block 17 so that no curing of the mixed resin can occur within the block 17. In addition, each of the inlets 21 is provided with a non-return valve 24 so that there can be no flow of the resin components or the mixed resin from the supply line back through the block when the apparatus is not operational or should the motive force being applied to the resin components and the mixed resin within the supply line 16 fail or vary. The non-return valves 24 are preferably of simple construction, for example ball check valves, as shown in Fig. 3 but other types of non-return valves can be used. The block 17 is preferably made of two separate parts 25, 26, as shown in Fig. 3, that are detachable connected together, for example by bolts 27, with the inlets 21 defined by part 25 and the single outlet 23 formed in the separate part 26. This enables the parts 25, 26 to be interchangeable to enable equivalent parts to be used that have differently sized threads and inlet/outlet orifices dependent on the quantities of resin required and the relative sizes of the rest of the inlet and outlet hoses. The inlet part 25 of the block 17 is also provided with two ports 28 that are usually closed by plugs 29 that can be opened when the injection head is not in use to facilitate cleaning of the block 17, as described below, or if additional components need to be added to the resin components for use in the injection head.
The supply of the two streams of resin components to the mixing block 17 from the separate tanks 5 is controlled by a valve arrangement 30, as schematically shown in Fig. 4. This preferably comprises two three-way valves 31, for example L-port valves, that are located in the two delivery hoses 4 respectively immediately upstream of the mixing block 17. The Import valves 31 enable the flow of fluid to be diverted away from the mixing block 17 and back to the respective supply tank 5 down respective return outlets 32 and connected hoses when flow to the injection head 2 is not required. The recirculation of the resin components in this way enables a stable temperature to be maintained throughout the apparatus. In order to ensure that the flows of resin components through the valve arrangement 30 to the mixing block 17 is started and stopped at the same time, opening and closing of the valves 31 is by a single control handle 33 linked to each of the valves 31 that switches flow from the mixing block 17 to the return hoses 32 and vice versa. The control handle 33 ensures that the flow of resin components to the mixing block 17 is switched on concurrently to ensure the correct mixture is achieved.
- 8 It will be appreciated that the mixing block 17 and valve arrangement 26 are both of simple construction and therefore lightweight, which facilitates handling of the injection head 2 as a whole.
In order to permit the injection head 2 to be periodically cleaned, the mixing block comprises a third inlet 34 to passageways 35 that are respectively linked to the ducts 22 downstream of the check valves 24. Each of these passageways 35 is also provided with a non-return valve 36 that is normally closed when the valve 24 in the linked duct 22 is open. When the injection head 2 is not operating and the flows through the valve arrangement 31 are diverted back to the tanks 5 so that the valves 24 are closed, a cleaning fluid can be pumped into the inlet 34 that opens the valves 36 and flows through the passageways 35 and ducts 22 into the supply line 16 and thence through the nozzle 13. Such a cleaning fluid comprises appropriate solvents for the type of mixed resin being delivered by the injection head 2. The cleaning fluid will therefore dissolve any resin residues in the mixing block 17, supply line 16 and nozzle 13. As all of these components can be made of a material such as stainless steel and as there are no moving parts within the injection head 2, such cleaning can be accomplished quickly and easily when required. The ports 28 can also be opened to permit cleaning fluid to be pumped into and through the mixing block 17.

Claims (20)

1. Apparatus for delivering a resinous lining material to a pipeline comprising an injection head with a nozzle, an air supply conduit and a mixed resin supply line wherein, in use, mixed resin issuing from the supply line is injected into an airstream issuing from the air supply conduit for delivery to the pipeline via the nozzle, a baffle being located within the air supply conduit that, in use, promotes turbulence within the airstream issuing from the conduit.
2. Apparatus as claimed in Claim 1, wherein the baffle comprises a helical flight.
3. Apparatus as claimed in Claim 2, wherein the helical flight has a longitudinal axis that is coincident with a longitudinal axis of that portion of the air supply conduit in which it is located.
4. Apparatus as claimed in Claim 2 or Claim 3, wherein the helical flight comprises at least one complete revolution.
5. Apparatus as claimed in any of Claims 2 to 4, wherein the helical flight is located within an end portion of the air supply conduit adjacent its outlet.
6. Apparatus as claimed in any of Claims 1 to 5, wherein the airstream through the injection head is controlled by either positive or negative pressure applied to the conduit.
7. Apparatus as claimed in any of Claims 1 to 6, wherein a heat exchanger is located upstream of the air supply conduit whereby the temperature of the airstream through the conduit is controlled.
8. Apparatus as claimed in any of Claims 1 to 7, wherein a dryer is provided to desiccate the airstream through the air supply conduit.
9. Apparatus as claimed in any of Claims 1 to 8, wherein the mixed resin supply line is located, at least partially, within the air supply conduit.
10. Apparatus as claimed in Claim 9, wherein the portion of the mixed resin supply line within air supply conduit runs along the longitudinal axis of the helical flight.
11. Apparatus as claimed in any of Claims 1 to 10, wherein the mixed resin supply line comprises a static mixer located along its length.
12. Apparatus as claimed in Claim 11, wherein the static mixer comprises a plurality of static mixer blades that are located along the length of the mixed resin supply line.
13. Apparatus as claimed in any of Claims 1 to 12, wherein the injection head comprises no moving parts.
14. Apparatus as claimed in any of Claims 1 to 13, wherein the air supply conduit is connected to the connection nozzle by a quick-release coupling.
15. Apparatus as claimed in any of Claims 1 to 14, wherein the mixed resin supply line is fed with two separate streams of fluid comprising two components of the mixed resin from a mixing block wherein the flow of each stream of fluid through respective passageways in the mixing block is controlled by a non-return valve.
16. Apparatus as claimed in Claim 15, wherein the mixing block defines two inlet ports and a single outlet port respectively formed in separate inlet and outlet parts of the mixing block that are detachably connected together.
17. Apparatus as claimed in Claim 15 or Claim 16, wherein the passageways in the mixing block each have a valve-controlled connection to a port in the mixing block for the supply of a cleaning fluid to the injection head when the flow of mixed resin to the injection head is not required.
18. Apparatus as claimed in any of Claims 15 to Claim 17, wherein the flow of each of the two streams of fluid to the mixing block from respective supply tanks is controlled by a three-way valve whereby the flow can be diverted back to the supply tank when flow to the injection head is not required.
19. Apparatus as claimed in Claim 18, wherein the two three-way valves are opened and closed by a single handle linked to each of the threeway valves.
20. Apparatus as claimed in Claim 18 or Claim 19, wherein each of the three-way valves is an L-port valve.
GB1715033.5A 2017-09-19 2017-09-19 Apparatus for delivering resinous lining material to a pipeline Active GB2567416B (en)

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GB1715033.5A GB2567416B (en) 2017-09-19 2017-09-19 Apparatus for delivering resinous lining material to a pipeline

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GB2567416A true GB2567416A (en) 2019-04-17
GB2567416B GB2567416B (en) 2020-03-11

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62234570A (en) * 1986-04-04 1987-10-14 Hakko Co Ltd Device for lining inner surface of pipe by air floating method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62234570A (en) * 1986-04-04 1987-10-14 Hakko Co Ltd Device for lining inner surface of pipe by air floating method

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Publication number Publication date
GB201715033D0 (en) 2017-11-01
GB2567416B (en) 2020-03-11

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