supply of air brake pipe , air brake pipe 32 n.b.(f.p.) with socket 32 n.b. & flange 32 n.b. for boxnhl as per wd- 08008-s-11, item-4, alt-7 with socket, flange and fixed flange as per wd-08008-s-11, item- 11,12 & 13 alt-7 and wd-83062-s-07, alt-7 and wd-83062-s-06, alt-5. material specification of pipes as under, pip e 32 nb - seamless to is:1239 (part-1) heavy grade or astm a-106 gr. a. material of socket & flange - is-2062-2011, amendment-1 of nov. 2012, gr. e 250 a. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]