supply of branch pipe 20 n.b. with socket & flange (welded assembly)branch pipe 20 n.b. with socket & flange (welded assembly),branch pipe 20 n.b. with socket & flange (welded assembly) to rdso drg. no. wd-80 007-s-11, alt.no.12, item nos. 8, 15, 16, 17 & 18. details of socket & flange to rdso drg.no.wd-8306 2-s-07, alt.no.-6, item no.-2 & 3. other technical requirements confirming to rdso specification no.0 4-abr-2019. material specification of pipe is as under, pipes 20 nb- stainless steel to astm- a 312, sc hedule 40 s, gr.tp 304 (erw) flanges & socket- stainless steel to is: 6911-2017, with amendment 5, grade: x 04 cr 19 ni 9 304 si. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]