300 mm wide 300 m long cold applied wrapping tape for water
pipeline reach standard awwa c 214
The pre-fabricated polyolefin tape coating system shall consist of
the following layers to provide an applied coating system thickness
of 80 mils (2mm) on the exterior of the steel pipes.
- A liquid adhesive layer.
- An inner-layer tape for corrosion protection.
- An intermediate-layer tape for mechanical protection.
- An outer-layer tape for mechanical and UV protection.
Liquid Adhesive layer:
The liquid adhesive layer shall consist of a mixture of suitable
rubber and synthetic compounds and solvent. The liquid adhesive
layer shall be spray applied to the abrasive blasted prepared pipe
surface before application of the inner-layer tape. The function of
the liquid adhesive is to provide a bonding medium between the pipe
surface and the inner-layer tape.
The liquid adhesive shall be supplied by the manufacturer that
supplies the inner-layer tape. The liquid adhesive shall not settle
in the container forming a cake or sludge that cannot be easily
mixed by hand or mechanical agitation and it shall have good
Table I - Physical Properties of the Liquid Adhesive
Rubber and Synthetic Resins
|Flammable||-||6-8 lb/gal (0.72 – 0.965g/l)||-10oF (-17oC) or greater|
|Non flammable||-||10 – 12 lb/gal (1.20 – 1.44 kg/l)||none|
The inner-layer tape shall be a two-layer tape consisting of a
polyolefin 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 shall be
polyolefin only, containing not more than 3.5 percent, by weight,
of non-polyolefinic 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 backing and adhesive shall be made from materials that provide
high electrical resistivity, resistance to corrosive environments,
low moisture absorption and permeability, and shall provide an
effective bond to a primed steel surface. The inner-layer tape
shall be of material that will resist excessive mechanical damage
during normal application operations and shall be sufficiently
pliable for the intended use. The inner-layer tape shall withstand,
without tearing, the tensile force necessary to obtain a tightly
wrapped inner coating free of voids. The inner-layer tape shall be
supplied in roll form wound on hollow cores with a minimum inside
diameter of 75mm.
To ensure a proper smooth coating, the inner-layer tape shall be
provided in standard widths as per manufacturer recommendations
consistent with the pipe diameter. Width shall be approved by
Table – I Physical Properties of Inner Layer Tape
|Minimum||Maximum||Test Method (Ref AWWA C214-14)|
|Width deviation||-5% or -1/4 in. (-6 mm) whichever is smaller||+5%||Sec. 5.2.3|
|Nominal thickness 20mil (0.508 mm)||19 mil (0.48 mm)||Sec. 5.2.4|
|Ratio of adhesive to total inner- layer tape thickness, t||40% of total t||60% of total t||Sec, 5.2.4|
|Adhesion to prepared steel||12.5 lb/in. width|
(2.8 N/mm width)
|Water absorption (24 h)||-||0.2% by wt||Sec. 5.2.6|
|Dielectric strength||450 V/mil|
|Insulation resistance||500,000 megohms||Sec. 5.2.9|
20 lb / in width
(5.300 N/mm width)
|Nonpolyolefinic Material Percent by Weight||-||3.5%||Sec. 5.2.12|
Intermediate- layer tape / Outer-layer tape:
The intermediate -layer tape / outer-layer tape shall be a
two-layer tape consisting of a polyolefin backing layer with a
laminated butyl adhesive layer. The manufacturer shall certify that
the backing material shall be polyolefin only containing not more
than 7.0 percent, by weight, of non-polyolefinic material
consisting of pigments, antioxidants and stabilizers. The
intermediate -layer shall be compatible with the inner-layer tape
and the outer-layer tape shall be compatible with the
intermediate-layer tape. The primary function of the intermediate -
layer tape is to provide mechanical protection to the inner-layer
tape and of outer-layer tape to provide mechanical and outdoor
weathering (UV) protection to the tape system, and secondarily, to
contribute to the overall corrosion-protection properties of the
system. The outer-layer tape backing shall be compounded so that it
will be resistant to outdoor weathering. To distinguish the
intermediate- layer tape from outer-layer tape the colors of the
two layers shall be different. The intermediate- layer tape color
shall be grey and the outer-layer tape color shall be white.
The outer-layer tape should be of suitable quality for the local
environment, as follows:
|Storage Temperature||: 0 to 500C.|
|Over-ground Condition||: 0 to 600C.|
|Under-ground Condition||: 70C to 350C.|
|Ultraviolet-ray Protection||: Required in outer layer.|
Materials used in the intermediate-layer & outer-layer tape
shall have high electrical resistivity, low moisture absorption and
permeability, and shall provide mechanical protection during
handling and outdoor storage. The intermediate - layer &
outer-layer tapes shall be sufficiently pliable for normal
application operations and shall form an effective bond to the
inner-layer / intermediate-tape layers. The intermediate- layer
& outer-layer tape shall be supplied in roll form wound on
hollow cores with a minimum inside diameter of 75mm.
JINING XUNDA PIPE COATING MATERIALS CO.,LTD
Our advantage: we have the advanced production technology, Scientific management
method, First-class R & D team, Perfect after sales service
system . We have got the SGS , DVGW, AWWA test report and ISO9001,
ISO14001, ISO18001,Bureau Veritas certification. We are the Audited
Suppliers of SINOPEC, CNOOC,CNPC. We established from 1998 and
growing up to the largest pipeline anti-corrosion tape manufacturer
in China since 2013 .
Our major market including more than 70 countries, widely
distributed in South Asia, Southeast Asia, Central Asia, West Asia,
the Middle East, Africa, Europe, Eastern Europe, South America,
Coating System: Xunda Coating system is always made up of Primer, inner wrap tape
and outer wrap tape or primer and Bitumen tape system. Our
Primer+inner wrap tape +outer wrap tape coating system is very
popular in Many government oil , gas ,water company, such as MEDCO
of Indonesia,BGSL,TITAS,JALALABAD OF Bangladesh,CPGCL ,OGDCL of
Pakistan and so on, Our Primer +bitumen tape coating system is very
popular in Ukraine state Gas company(UkraineTransgas) , Australia,
Yemen and so on.
Your needs , our pursuit .