AWWA C 214 PIPE COATING SYSTEM
The prefabricated polyolefin tape awwa c 214 pipe coating system shall have three or four layers consisting of the following:
1. A liquid adhesive layer.
2. An inner-layer tape for corrosion protection.
3.An intermiddle -layer tape for mechnical protection
3. An outer-layer tape for UV protection.
The tape shall be made of prefabricated tapes in rolls.
First layer is liquid adhesive. we have 3 mainly types liquid adhesive, 19%,27% and 29% solid content liquid adhesive.besides, we can supply 100% solid content liquid adheisve too if you need it .
Secondly layer is inner-layer tape.The inner-layer tape shall be a two-layer tape consisting of a polyolefin
(only) backing layer with a laminated butyl-based adhesive layer. The inner tape shall be compatible with the liquid adhesive. The manufacturer
shall certify that the backing material is polyolefin only, containing not less than1.0 percent nor more than 3.5 percent, by weight, of nonpolyolefinic material consisting of carbon black and antioxidants. The inner-layer tape shall be applied after the liquid adhesive and before the outer-layer tape. The primary purpose of the inner-layer tape is to provide corrosion protection.
Thirdly layer is intermiddle-layer tape or outer-layer tape.The outer-layer tape shall be a two-layer tape
consisting of a polyolefin-only backing layer with a laminated butyl adhesive layer.
The manufacturer shall certify that the backing material is polyolefin only,
containing not less than 3.0 percent nor more than 7.0 percent, by weight, of nonpolyolefinic material consisting of pigments, antioxidants, and stabilizers. The outer-layer tape shall be compatible with the inner-layer tape. The primary function of the outer-layer tape is to provide mechanical and outdoor weathering protection to
the tape system. A secondary function is to contribute to the overall
corrosion-protection properties of the system. The outer-layer tape backing shall be compounded so that it is resistant to outdoor weathering. Because aboveground
environmental conditions vary, the purchaser should consult the manufacturer as to the type of outer wrap that is recommended for the specific anticipated storage
condition, including the necessity for ultraviolet-light protection. When applied as a part of a multiple-layer tape system, the outer-layer tape shall conform to the shape of the layers of tape it covers.
If the project need more one layer tape, you can add one layer outer tape. so the thirdly layer is called intermiddle layer tape.
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