Carrying Out Preheating, Post-Heating, And Post Weld Heat Treatment (Stress Relieving) Of Weld Joints And Attachment Welds On Shop/Site-Fabricated And Erected Piping Systems On Labour-Contract Basis In Connection With Composite Works For Pdh Unit For Gail Usar Pdh-Pp Project At Usar, Alibag, Dist. Raigad, Maharashtra.///To Carry Out “Preheating, Post-Heating And Post Weld Heat Treatment (Stress Relief) Of Weld Joints And Attachment Welds On Piping Systems Fabricated And Installed At Shop/Site” On Labor-Contract Basis In Respect Of Overall Works For Pdh Unit Of Gail Usar Pdh-Pp Project Located At Usar, Alibaug District, Raigad District, Maharashtra.