supply of air brake pipe and pipe fitting , air brake pipe and pipe fitting (bp) for boxnhl wagon as per drg.no. wd-09082-s-02, item n o. 1,3,5,6,7 alt-01 or latest as per annexure attached. material as per rdso letter no. mw/apb dt. 02.08.2 019 as seamless to is: 1239 (part-i) heavy grade or astm a-106 gr. a [ warranty period: 30 months aft er the date of delivery ] ] , set of air brake pipe for twin pipe air brake system in boxn wagons. one set consisting of it ems (in nos) given as per annexure enclosed. the specification of 32 nb pipe is is-1239 part:1 (heavy) ms seamless and 20 nb pipe to specn. astm-a-312 sch 40 s gr.tp 304(erw) as per rdso s pecn. of 04-abr-02 with amendment no.8 of sept 2016 [ warranty period: 30 months after the date of delivery ] ] , set of air brake pipes with flanges & sockets ( welded assembly) for retro-fitment bcna wa gons consisting of following items as per rdso drawing & other technical requirements confirming to rd so specification no.04-abr-2002 of april 2003, read with all amendment, latest amendment no.8 of septe mber 2016,material specification of pipes as under, pipes 32 nb- seamless to is: 1239 (part-i) heavy grade or astm a106 gr.a pipes 20 nb- stainless steel to astm-a 312 schedule 40 s gr.tp 304 (erw) flanges & s ocket stainless steel to is: 6911-1992 x 04 gr.19 ni 9 304 si for 20 nb branch pipe and is: 2062-2011, am endment 1 of nov.2012, gr.e250 a for 32 nb feed pipe.(as per annexure a ). [ warranty period: 30 mont hs after the date of delivery ] ]