タイトルまたは説明

PE butyl adheisve tape for gas pipe wrapping tape
Description
The Xunda anti-corrosion tape T**0, mechanical protection tape T**0 is a multilayer system used for the corrosion protection of oil ,gas ,and water underground or aboveground steel pipeline. T**0 &T**0 consist of  two layers, the butyl rubber adhesive laminated on the polyethylene film backing. The T**0 can be used as inner tape, T**0 can be used as outer tape.
Xunda liquid adhesive can be used as primer for this system. The liquid adhesive represent an anti-corrosion layer and provide a uniformly smooth contact surface to promote high adhesion of the coating system to the pipe.
The anti-corrosion tape assures a high bond to the primed surface with excellent conformability. The mechanical protection tape achieves a complete bond to the anti-corrosion tape.
The system can be applied by hand or with a wrapping machine.

 Features

 Excellent adhesion to a wide range of substrates found,
including concrete and steel piping.
 Compatible with common pipe coatings.
 Endures extremes of heat and cold.
 Excellent resistance to cathodic disbondment.
 High water and vapour impermeability.
The specification of the tape consists of two layers, adhesive layer and film backing
Adhesive: butyl rubber
 Film backing: Special blend of stabilized polyethylene 

Usesing

 Provides long-term corrosion protection to steel pipelines.

 Repair of damaged factory applied corrosion protection.

 Outlining weld beads and cut backs prior to wrapping bare-welded joints.

 Outlining seams on spiral and seam welded pipe.

 Primer-less mastic tape readily conformable to odd-shaped pipe

fittings, valves, flanges and other buried structures.

 Application

 1) Steel pipe pretreatment
 1.1 Keeping the pipe external surface clean and dry.Remove the dust, oil, welding slag, burrs, grease and dirt on pipe surface.
 1.2 Pipe surface prepared up-to a level of Sa 2 or 2 ½ or St 2/st by sand blasting.  1.3 After the precleaning operations, the pipe surface not smoothwhich may sharp the pipe coating should be        burnished , the abrasive dust attached on the pipe surface should also be cleaned clearly.
1.4 If flash rusting occurs, the surfaces must be re-cleaned by blasting as above. 
 2) Coating &Wrapping application
2.1 Coating &wrapping application consist of primer application, inner tape coating ,outer tape coating 2.2 weather condition
2.2.1 When the wind&sand was strongly, when the sand and dust covered on the surface of pipe, primer ,tape etc., should not be brushing primer and wrapping the tape if there is no reliable preventive measures.
2.2.2 When air humidity is greater than *0%,or when the pipe surface is wet from any precipitation, should not be brushing primer and wrapping tape.
 3) Brushing primer
3.1 The brushing time should be control within 6 hours between the pipe surface treatment and brush primer      During brush primer, pipe surface should be free from damp and pollution. If the pipe surface
      rust return, should be re-pre-cleaned.
3.2 The primer should be mixed evenly in the container before brushing.
3.3 The primer should be applied uniformly, without any sags, floods, runs, drips, bare spot and over spray, such as leakage brush, clot, streaming. The primer coat DFT shall not be less than ****0micron (**2mils)
3.4 After the primer dried, then wrapping the tape(It usually takes 3to 5 minutes.).
3.5 Consumption:
      machine applicationapprox. 0,1 litre/m²
      hand applicationapprox. 0,2 litre/m²
4) Wrap tape application
4.1 Wrap tape application consists of hand application and machine application.
4.2 The tape applied temperature must be above 5 degrees,the coating construction temperature shall be more than *5 degrees as better .
4.3 The tape shall be spirally applied ,minimum overlap shall not be less than *0%.
4.4 When a new roll of tape started ,the ends shall be located to ensure the continuity of wrap tape using the same method of application.
4.5 Outer tape applied method is the same as above.
 5.Cutbacks
 Cutbacks shall be a minimum 6inches(**0mm) from the ends of each pipe.The cutbacks may be taperedor straight edge for the total thickness of the coating.