supply of pipe 20mm with socket & flansge (special), pipe 20 bore for boxnhl (bmbs).pipe 20mm with socket & flansge (special), pipe 20 bore for boxnhl (bmbs).,air brake pipe 20mm with socket & flansge (special) to rdsos drg no wd-80007-s- 11 alt 12 or latest, item no.8, 15 to 18 and confirming to str no.04-abr-02 with all amendmen ts. the specification of 20 nb pipe to specn. astm-a-312 sch.40s gr.tp.304 (erw) as per rdso sp ecn. of 04-abr-02 with amendment no.8 of sept 2016 [ warranty period: 30 months after the date o f delivery ] ] , pipe 20 bore for boxnhl (bmbs). as per rdsos drg. no. wd-09034-s-12, alt-8 or latest, ite m no. 7, fitted with item no. 19, 20, 21 and 22. material: as per specification and drawing. spec.: 04-abr-0 2 and wd-02-boxnhl-mbs-2009 with latest amendment. [ warranty period: 30 months after the date of delivery ] ] , pipe 20 mm n.b. with socket & flange as per rdso drg no. wd-80007-s-11, alt-12 or latest, item no. 7 fitted with item no 15 & 16 and confirming to str no. 04-abr-2019 (rev-2 of dec -2019) or latest [ warranty period: 30 months after the date of delivery ] ] , pipe 20 mm n.b. with socket & flange as per rdso drg no. wd-80007-s-11, alt-12 or latest, item no. 9 fitted with one end item no 15 & 16 and other end items no 17 & 18 confirming to str no. 04-abr-2019 (rev-2 of dec-2019) or latest [ warranty period: 30 months after the date of d elivery ] ] , pipe 20 bore for boxnhl (bmbs) as per rdsos drg. no. wd-09034-s-12, alt-8 or latest, ite m no no.9, fitted with item no 19 & 20. specification as per rdso spec no 04- abr-2019 (rev 02 of dec 20 19). material as per rdso letter no. mw/apb dt. 22/05/2020- stainless steel to astm-a312 schedule 40s g r. tp 304 (erw). [ warranty period: 30 months after the date of delivery ] ] , pipe 20 bore for boxnhl (bmbs) as per rdsos drg. no. wd-09034-s-12, alt-8 or latest, ite m no.10, fitted with item no.19 & 20. specification as per rdso spec no. 04-abr-2019 (rev 02 of dec 2019 ). material as per