Cooling Water Pipe

Cooling Water Pipe

NTPC Simhadri Cooling water pipe lining

Cooling water Pipe lining

Amchem – Power Industry's Preferred Vendor For Cooling Water Pipe Lining.

In 2001, as part of the 650,00 sq. ft cooling tower coating project for NTPC / NBCC at NTPC’s 2 X 500 MW Simadhri Thermal Power Plant, Amchem had to internally line several large diameter steel pipe (from CW duct to towers ) carrying sea water with 2,000 Microns Purethane® Coating. The steel pipes carry approx. 60,000 M3 / Hour (60 Million Litres / Hour ) of Seawater and range from 2.4 metres to 3.2 metres in diameter.

Amchem designed and deployed special automated blast cleaning and coating rigs for the project. These rigs were motorised for linear travel and contained special rotary blasting/ spray heads. Travel and rotation speeds were controlled by precision variable speed AC drives. This allowed setting of optimum speeds for travel and rotation in accordance with required blast standards (SSPC SP-10), coating thickness and tip spray rates. Coating thickness was very even using the automated system with spot variation of not more than 100 Microns.

Field tests conducted on adhesion reported results of up to 16 N/mm2 ( 2,300 Psi ) against the 8 N/mm2 minimum specified. The pipe lining was holiday tested at 6,000 V and a pinhole free coating was provided. Samples were also drawn and sent to the Indian Institute of Chemical Technology (CSIR), Hyderabad for testing coating parameters like Tensile Strength, Recoverable Elongation, Water Vapour Transmission, Flexibility, Impact and Abrasion Resistance. 100% of tests exceeded the specified parameters.

The pipe has been in operation since 2001 with zero defects or maintenance.

Since the first project at Simadhri, Amchem has emerged as the preferred vendor for lining large diameter cooling water pipelines for the power generation sector. This is due to the high quality of its Purethane®, 100% Solids Polyurethane Coating materials as well as the application/ technical capability of Amchem crew. All operations – blast cleaning & lining are fully automated, whether above ground or in the trench.

Our product performance, delivery as well as documentation & response time has been rated as EXCELLENT by customers – we are highly proud of this achievement.

Presently (Early 2012), the following lining projects, totalling approx. 13,35,000 Sq.Ft are underway and nearing completion :

  • NTCEL Vallur (IVRCL) 3.2 and 2.2m Dia Pipe.
  • NTCEL Vallur (Gammon India) 2.2m Dia Pipe (replacing failed vendor).
  • NTPC Simadhri (ERA Infra) 3.2 m Dia Pipe.
  • NTPC Simadhri (KBL) 3.2 m Dia Pipe (replacing failed vendor).
  • APGENCO Krishnapatnam (Tata Projects) 0.9-3.7m Dia Pipe.

We will be happy to provide turnkey installation on your upcoming projects!

Shomendra Mann
Amchem Products Pvt. Ltd
A-79. Sector 58,
NOIDA 201 301, India
Tel : 0120 - 2580121 / 4325540
Fax: 0120 - 2581351
E-Mail :
Website :