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Dear Suresh,

When a contractor insists on using galvanised iron (GI) pipes as sewer carriers in sewage pumping instead of cast iron (CI) pipes mentioned in the Bill of Quantities (BOQ), there is definitely need to study its implications.

GI pipes are iron pipes coated with zinc to prevent rusting and corrosion. They find extensive use because they are cheap, light in weight and easy to transport and handle. The problem with them is that, on ageing, the zinc coating gradually wears away to expose the iron to rust rapidly in the presence of water. They are then prone to clogging, scale formation and corrosion, necessitating replacement. The problem is further aggravated in not taking proper care to protect them against contact with concrete, cement mortar, lime mortar, plaster or wall/suspended floor during their laying. Any delay in the replacement of these leaking GI pipes leads to environmental pollution.

In contrast to this, properly laid CI pipes provide trouble free service for a long time.

Hope the information provided will be of use for you to take a decision in the matter.

Best wishes,

Dr. R. Jagadiswara Rao
Retired Professor of Geology
Sri Venkateswara University
Tirupati, AP 517502
rjagadiswara@gmail.com

Dr. R. Jagadiswara Rao, Professor of Geology Retired, Sri Venkateswara University, Tirupati, AP 517502, India rjagadiswara@gmail.com

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