supply of filling pipe arrangement for btpn tank wagon , filling pipe arrangement for btpn tank wagon, as per item no. 12 and item no . 14 of rdso drawing no: wd-86081-s-61, alteration no: 14 or latest alteration. material and specification must conform to is:1239-2004 (part-i) grade-heavy (with latest amendments) and as per the enclosed reference drawing. note: a comprehensive material test certificate (mtc) from an nabl accredited or government approved labora tory must be submitted along with the supply, explicitly verifying hydrostatic test com pliance, wall thickness and metallurgical composition as per the relevant sections of i s:1239 / rdso drawing specification. [ warranty period: 30 months after the date of delivery ] ]