Coating

Internal protection for the pipes

 

 

  

Ductile pipes are used for conveying a wide variety of media,  untreated water, drinking water, sewage. Such liquids can affect the nature of the pipeline in very many aggressive ways.
Our production range contains a number of tried-and-tested interior linings to combat virtually all forms of aggression.

Cement mortar linings conform with ISO 4179/EN 545.
The cement-mortar lining prevents tuberculation of the pipe by creating a high pH condition at the pipe wall and stops the production of red water.

 

The seal coat provides a barrier between soft or acidic waters and the cement-mortar lining.
Additionally, cement-mortar linings create a hydraulically smooth flow surface inside the pipe, resulting in less friction and thus, less head loss.
Cement mortar linings helps to maintain same flow area and co-efficient of friction over a long period of time

External protection for the pipes

Pipes buried in soil are exposed to soil aggression. So a variety of external protection measures are available to match various type of aggression. 

The following coatings, paints sheaths, and wrappings have long proven themselves in practice: 

1.  Bitumen coating.
According to  (ISO 8179/EN 454),       
plus a top bitumen coating of at least 70 µm. Zinc spraying fuses and sprays zinc wire onto the pipe surface. The following bitumen coating comprises a blend of resistant,   tropics-proof bitumen and inert fillers.

2. Zinc coating


 Pipes are coated externally by pure metallic zinc at a rate of 130/g/m2 according to the International standard or 200g/m2 as per customer standard request.    .
The metallic Zinc coating is covered by a finishing layer of 120 microns of bituminous paint as per international standard.  An improved chemical and mechanical stability of the coating is provided by the zinc coating and the finishing

3.  polyethylene
If necessary, the pipes protected in this way can be additionally sit wrapped in polyethylene-foil according to (ISO 8180/EN 545 ). A polyethylene sleeve can be drawn over the shaft and socket or alternatively, the shaft and socket can be enveloped in flat film.

 

  

 

  
   
 

One of the particular features of the external zinc coating is its ability to restore the continuity of the protective layer where small areas of local damage exist. The Zn++ ions migrate through the pore sealer to plug the damage and then convert into stable, insoluble zinc corrosion products

Epoxy lining
Epoxy linings comprise a two component material that is sprayed. They are used from 1 to 14 pH. The thickness of the linings is such to withstand a test at 5 kV. the use of such high-grade and costly material is limited to the few instances in which the medium has a pH lower than 2. 
 (epoxy coating upon Request)

  • N.B : (ENC) can be offer any protected ( Internally & Externally ) by other protection materials upon customer request.

 

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