Choose the galvanized product first.
GI means galvanized iron: steel pipe or tube with a zinc coating. Compare galvanized heavy-gauge pipes and light-gauge pipes against the specified wall and service. Diameter alone is not enough to compare the two.
For fencing, railings and frames, review lightweight steel tubes. This family is for non-water fabrication; a galvanized surface does not turn it into a water pipe.
Match the coating to the exposure.
Outdoor structures, plumbing and industrial systems face different exposure. Galvanized pipe still needs care at cut edges, welds and damaged coating. Allow for drainage and maintenance.
For drinking water, check that the material and connections meet the approved design; the GI name alone is not enough.
Check the coating before fabrication.
Ask which coating requirement applies and which documents confirm it. Use the relevant product standards and current technical documents for the specified product. Threading, cutting or welding may need coating repair; welding also requires appropriate fume controls and qualified procedures.
Ask what the supplier will provide.
Send your pipe specification and quantities with any drawings already available. Ask the supplier to identify included documents, availability and delivery scope. Use the galvanized iron pipe price guide and compare the same product, coating and delivered quantity.
