Question: is specification of gi pipe?
Answer: 1. Indian Standards: Specification IS: 1239 (Part-I) 1990 (Light, Medium & Heavy Series) Black & galvanized, plain end screwed and socketed up to 100 mm NB all series, 125 & 150 mm NB. 2. Indian Standards: Specification IS: 1978-1982 up to 200 mm NB grade & YST - 170 and YST - 210.