- Field application of coal tar and asphalt enamel
This was applied in a manner similar to the coating of pipeline by wrapping hot enamel and fabric around the joint
- Liquid applied field joint coatings (solvent free two pack liquid epoxy and polyureathane)
- Radiation cross-linked heat shrink sleeves
Traditionally, radiation cross-linked heat shrink sleeves were used for asphalt and coal tar enamel coated pipe as field joint coating. It is successful for field joint of line pipes coated with FBE, two or three layer polyethylene (PE) recently. Some test of this field joint coating for FBE-polypropylene coated line pipe
- FBE powder coating
FBE powder coating is also applied for field joint of line pipes coated with FBE, two or three layer polyethylene (PE)
Normally, FBE-polypropylene is selected for line pipe with requirements of high mechanical damage resistance and operating under high temperature. Therefore, the similar FBE-polypropylene field joint coating is also required. Normally, FBE is applied as the first layer. A number of types of FBE-polypropylene field joint coatings
- FBE-Sintered polypropylene copolymer
Will have limited coating film thickness (<1 mm) with porous in coating structure if the temperature is insufficient.
- FBE-Coextruded polypropylene sheet
PP-PP adhesive sheet wrapped on field joints, it is a time consuming process, however the it is close to the line pipe coatings.
- FBE-Injection moulded polypropylene
The most complicated and costly process, only utilised in offshore pipeline.
- FBE-Flame sprayed polypropylene copolymer
The most versatile process for field joint with large range of film thickness
- FBE-Coextruded polypropylene tape
This is a variation of FBE-Coextruded polypropylene sheet, which is more convenient in field application.
- Polypropylene heat shrink sleeve