Ability to transport effluents and chemical resistance

Last updated on Mon, 12/09/2013 - 14:58

Resistance to domestic fluids:

Building waste water drainage systems - grey and black water- are daily exposed to domestic effluents specified by EN 877 standard. Raw cast iron is sensitive to corrosion, so SAINT-GOBAIN PAM is continuously carrying out research on its coatings to protect the cast iron products lifespan.

In recent years, changes have been noticed in the types of domestic fluids:

  • Higher concentration of household detergents,
  • Use of more aggressive hygiene products,
  • Rise in operating temperatures.

The constraints on sanitary drainage systems are constantly increasing SAINT-GOBAIN PAM coatings improve to meet those increasing stresses.

Basic inner lining for pipes

The standard inner lining for PAM pipes is a sound, adherent epoxy resin which prevents the fluid transported from coming into contact with the metal.
The composition of the epoxy coating is controlled to minimise porosity, and its homogeneity is monitored in real time.
The smoothness of this coating increases flow rate and limits head losses.

Basic coating for fittings and accessories

The common coating for fittings is an epoxy resin deposited through an cataphoresis process.

Other processes can be used to meet specific requirements.

The average thickness of standard coatings for fittings can vary from less than 70 µm up to 150 µm, according to the targeted performance.

Resistance to corrosive or/and hot effluents

The inside of cast iron systems can be subjected to chemical and thermal aggressions when they transport fluids that are corrosive and/or at high temperatures.

Superior inner lining for pipes:

Same two-part epoxy resin but applied in two layers to obtain a film with no porosity.

Superior coating for fittings and accessories:

According to the principle of continuity with no weak points, coatings for hollow components must withstand the same stresses as pipes.

There is an anticorrosion coating process for these parts to face major stresses due to the fluids transported or to the environment: a reinforced coating for fittings and accessories. A fluid bed thick grey epoxy powder.

Epoxy powder coating in fluid bed:

Preheated parts are moved through a tank containing epoxy powder in suspension, to be coated. They are then stove dried to ensure perfect reticulation of the polymerised epoxy film. Perfect control of both temperature and immersion time determines the coating thickness.

A thick anticorrosion coating to guarantee long service life for products.

For more than 100 years of testing and market research, SAINT GOBAIN PAM has built up great expertise in cast iron. Increasingly effective coatings have been developed to keep pace with the changing utilisations and requirements.