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CRC-Evans custom-designs and installs equipment systems for both permanent and portable pipe-coating plants. Our systems are designed for all types of pipe cleaning and coating processes – both external and internal. We also design and install all levels of control systems, from simple levers to sophisticated computer controls. And we maintain close relationships with coating material manufacturers, to bring you the latest technology and advanced coating techniques. |
Typical system consists of the following: Diesel-Generator Unit |
With the first configuration the pipe surface can not be inspected. After the shot blast machine is a small conveyor that conveys the pipe toward a pipe carriage. Between the conveyor and carriage, the pipe surface will be primed. In the second configuration an outgoing conveyor, after the shot blast machine, transports the pipe towards outgoing skidways. As usual the pipe is lifted from the conveyor by padded pipe ejection units. The pipe can be blown-out, inspected, and grind. If the pipe surface has not been cleaned properly, it can be transported to the in-coming shot blast machine conveyor by ENDO conveyor modules. After inspection, the pipe will be moved to the primer station. After priming, the weld seam can be coated to make sure enough coating covers this area. Then the pipe is lowered onto the incoming coating conveyor which transports the pipe through the coating area. After coating, the pipe is cooled down in a cooling tunnel. Pipe ejection arm kicks the pipe out of the outgoing conveyor. External Coal Tar Enamel Coating Plant consist of: Incoming Skidways |
The Fusion Bonded Epoxy Layer is applied for the purpose of anti-corrosion protection. The adhesive layer sticks the Polyethylene Layer to the Fusion Bonded Epoxy Layer. The Polyethylene Layer protects the Fusion Bonded Epoxy Layer against impact during transportation and pipe handling the pipe. Pipes are placed on the incoming skewed roller conveyor and transported to the heating system where the pipe will be preheated to the appropriate temperature. Using intermediate conveyors, the pipe will then be transported through the coating application area where the 3-layer coating can be applied. Pipes will be separated immediately after coating and will then be cooled down on the cooling conveyor with a controlled volume of recirculating water. The outgoing conveyor will move the pipe to the ejection arms for ejection onto the skidways for inspection and end-cleaning. The components that are supplied for the application of the coating materials is designed to be used to apply multi-layer type of coating system in accordance with the coating material manufacturers and Buyer’s specification. Typical System consists of the following: Incoming Skidways |
The weight coating machine uses a concrete batching plant to precisely measure aggregate and cement to produce any desired mixture accurately. An automatic moisture-sensing unit is employed to determine the amount of water required and in turn automatically dispenses the correct amount. The plant is equipped to batch two (2) different aggregates in addition to cement. Each ingredient is automatically weighed and held until mixer is ready for a new batch. After material is mixed, it is taken up the transfer conveyor to the receiving hopper. Material is metered out of holding hopper onto a metering conveyor, which shapes the wet concrete and in turn delivers material onto a high speed slinger belt. Prior to coating, the pipe may need special preparation, depending on coating type wire brushes are used to give the pipe a rough surface to increase surface adhesion and for a certain percentage anode rings need to be installed. Pipe is then loaded into pipe support carriages with heavy-duty pipe loaders. The support carriages are designed to rotate the pipe, and traversed in front of the application head at a controlled rate. Pipe is sprayed with water just prior to applying concrete to increase the bond between the corrosion coating and concrete. The slinger head propels pre-mixed concrete onto the pipe, at a high velocity to promote coating adhesion. A wire mesh is simultaneously wrapped around the pipe to reinforce the concrete. A curing compound is also sprayed on after concrete application to accelerate the curing time of concrete. After the pipe is coated, the pipe is removed with heavy-duty pipe unloaders and placed onto the weigh scales. Finally the pipe is taken to the storage area for final curing, in some cases steam curing is required depending on the environmental conditions. Note: Production will vary depending on customer specifications in relation to thickness and the amount on anodes required, increased production is attainable if the optional pipe loaders / unloaders are purchased. Typical system consists of the following: Concrete Application Machine |
PROCESS Pipes are separated by a pipe positioning apparatus. After that, they will be picked up by the transfer unit and lowered onto the pipe turning rollers. The boom carriage will drive internal lances into the pipe and on their way back grid will be transported through the lances and nozzles in order to clean the pipe surface. After the cleaning operation, the pipes are transported by the transfer unit onto outgoing skidways. Typical system consists of the following: Powered boom carriage |
This system is designed to clean the internal pipe surface, in preparation for internal coating procedures. Degree of cleanliness is controlled by the speed of the internal blast boom transferred through the pipe being prepared. This system is used to clean pipes with a diameter of 4" – 24" range.
PROCESS After pipe has been abrasively cleaned and all residual dust and grit has been removed, the pipe is transferred to the pipe turning roller unit. The turning roller unit rotates the pipe as the spray boom is inserted into the pipe until the spray head is located outside the opposite end of the pipe. As the boom is reversed, the spraying process starts. The turning roller continues to rotate the pipe until the spraying process is complete. All liquid epoxy spray equipment, such as pumps, tanks, hoses, and electric drives are mounted on the spray boom carriage. The boom carriage is moved on track rails capable of traversing the full length of pipe. There two adjustable collector carriages c/w extraction fans to extract the hazardous fumes that are emitted during the spraying process. The hazardous fumes are ventilated out of the building via ducting suitable to take away from the work area. Typical system consists of the following:
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This system is designed to apply a suitable spray coating, primer, or epoxy to the abrasively cleaned internal surface of the pipe. This equipment is recommended for API, NAPCA, NACE, and most other international coating specifications similar to the A/M coating specifications.
PROCESS Pipes are fed onto the rotation belts. A carriage drives the cement application boom into the pipe. On its way back, the applicator head applies the cement. After the coating application, the rotation belts rotate the pipe. Typical system consists of the following:
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The Internal Cement Mortar Lining Machine is designed to apply internal mortar linings in steel pipe. Internal cement mortar lining is normally used for water service application. Recommended for AWWA Standard C205-89 coating specifications.