20 Mm N.B. Flange Welded Joint (Pipe To Equipment) Drg No. Wd-83062-S-07, Alt-6, It Em No -1 To 5 Material & Specification: Rdso Specification No. 04- Abr-2019, Rev-2 Of Dec.2019.To Be Procured From Rdso Approved Firm [ Warranty Period: 30 Months After The Date Of Delivery ] ]