supply of set of pipes 32 nb with sockets and flanges , set of pipes 32 nb with sockets and flanges . drawing no :- wd - 96021 - s - 12 , alt. 5, item no. 1 to 4 . spec. no. :- 04 - abr - 02 (rev. 01 of nov. 2017) material :- seamless to is:1239 (part -i) heavy grade or astma-106 gr. a (for brake pipe & feed pipe used in conventional brake system as per rdso letter no. mw/apb dt. 02.08.2019 with attached annex-a). warranty / guarantee :- the warr anty/guarantee period will be 30 months from the date of delivery or 24 months from the date of co mmissioning, whichever is earlier. inspection :- i) further all the necessary inspections shall be carried out as per rdso spec. no. 04 - abr - 2002 (rev. 01 of nov. 2017) [ warranty period: 30 months aft er the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]