Supply, Fabrication and Erection of SS304L Pipe-in-Pipe Piping and associated structural works for HLW Trench from WTF to WMP of FRFCF Project

SS Pipe Fabrication & Erection (FIM): Handling, transportation of stainless steel pipes, half cut sleeve, etc. of grade 304L quality (Supplied as Free Issue Material & supplied under item no. 1.2). Marking, cutting, fabrication (excluding welding), and surface treatment of pipes as per approved procedure and erection of pipes at site as per the approved drawings. Sizes of pipes involved ranges from 8NB to 50 NB SCH 10 or 40. (The rate for each meter erected up to pipe size 25NB shall be considered as one inch metre). This item is payable if the pipe is erected and welded at site.

Supply of SS Pipes: Supply, inspection, testing, packing, handling, transportation of seamless stainless steel pipe of size 40NB SCH10, grade 304L, quality IGC Pr- A & C and delivered to FRFCF site as per ASTM A-312 TP 304L & Section-V Part-B of tender document. Payment terms as per Sec III clause 3.17.5.

Pipe Butt Welding (ER308L Filler Wire): Preparation of drawings, Gas Tungsten Arc butt welding of stainless steel pipes of grade 304L quality, Sch 10 or 40 pipe size of 8NB to 50NB, including hookup joints, using Argon gas for shielding and purging, ER 308L filler wire as consumable, Liquid penetrant examination (LPE) and local passivation of the weld joints as per specifications. (The rate for each butt joint welded up to 25NB shall be considered as one inch Dia.). This item is payable if the pipe is welded & erected at site and accepted in RT.

Pipe Fillet Welding (ER308L Filler Wire): Gas Tungsten Arc fillet welding of pipe sleeves and wherever required. Welding shall be carried out using ER308L filler wire with Argon gas for shielding and purging as per specifications. Item rate shall be inclusive of LP examination and local passivation. (The rate for each fillet joint welded up to 25NB shall be considered as one inch Dia)

SS Rectangular / Square Duct Work (FIM): Handling, transportation, marking, cutting, trimming, bending, forming, drilling, including cut outs / circular opening wherever required, fabrication of duct matching with supports and fixing of 3mm thick stainless steel sheets conforming to AISI 304L quality supplied as free issue material (FIM), surface treatment followed by installation of the same as per approved drawings excluding welding. Measured as the area of sheet / duct actually erected at site.

Plate Welding (Butt Weld): Gas Tungsten Arc butt welding of stainless steel plate / sheet / sections / duct of 304L quality of 3mm to 6mm thick with another stainless steel plate / sheet / sections / duct of 304L quality. Welding shall be carried out using Argon gas for shielding and purging, Liquid penetrant (LP) examination and local passivation of the weld joints as per specifications. Item rate shall be inclusive of LP examination and local passivation. Stainless steel to Stainless steel welding using ER308L filler wire.

Plate Welding (Fillet Weld): Gas Tungsten Arc Fillet Welding of stainless steel plate/sheet/sections of 304L quality of 3 to 8mm thick with another stainless steel plate / sheet / sections of 304L quality. Welding shall be carried out using Argon gas for shielding and purging, Liquid penetrant (LP) examination and local passivation of the weld joints as per specifications. Item rate shall be inclusive of LP examination and local passivation. Stainless steel to Stainless steel welding using ER308L filler wire.

Dissimilar Plate Welding (Fillet Weld of SS to CS): Gas Tungsten Arc fillet welding of Stainless steel ISMC to Carbon steel EP / shim plate, etc. Welding shall be carried out using Argon gas for shielding and purging, Liquid penetrant (LP) examination of the weld joints as per specifications. Item rate shall be inclusive of LP examination and DM water cleaning. Stainless steel to Carbon steel dissimilar welding using ER309L filler wire.

Nozzle Fabrication and Welding (Air sniffing line & air injection line (8NB) to outer pipe (40NB) and sub-header): Marking, cutting, drilling of stainless steel pipes of grade 304L quality supplied as free issue material (FIM) for the preparation of Nozzle joints as per approved procedure and Gas Tungsten Arc full penetration Nozzle welding using Argon gas for shielding and purging, ER 308L filler wire as consumable, Liquid penetrant (LP) examination and local passivation of the weld joints as per specifications. (One 8NB nozzle joint is considered as 0.25 inch dia)

Pipe-in-Pipe Bend Fabrication: Fabrication of stainless steel pipe-in-pipe bends by filling with fresh river sand in annular space between two pipes, closing of annular space and pipe inside separately by using machined SS washer and SS dummy or wooden plug. Fabrication of bend by hydraulic bending machine or any other means as per approved drawing and procedure. Bending procedure shall be dully approved by department in advance. The rate shall include liquid penetrant examination, thickness measurement of pipes before and after bending at bend portion using ultrasonic thickness measurement gauge and local passivation as per approved procedure. As per specification Bend radius shall be 5D of pipe DN. For payment, size of outer pipe will be considered. Please see the relevant clause Section-V of tender document. Sizes of pipe involved are 25 NB (inner pipe) & 40 NB (outer pipe).