Fabrication testing and supply of three acid storage tanks and dismantling and replacing the existing damaged tanks with newly fabricated_ supplied tanks

Amount

Supply and fabrication of 12mm thick carbon steel blank plates to make horizontal type acid storage tank (cylindrical shell & dished ends) as per drawing attached. Material is conforming to ASTM A516 Gr. 60. (Make: Tata/SAIL/Jindal steel plate).

Cold forming of Dished Ends with 12mm thick blank plates as per drawing. Size: Outer diameter of dished end 2400 mm, Knuckle radius150mm and straight face 50mm. Wall thickness at knuckle radius of dished end shall be within acceptable limit after cold forming.

Supply and fabrication of 500 NB AWWA standard carbon steel ring flange 25mm thickness for N1 Nozzle. Dimensions are conforming to ANSI B16.5 standard.

Supply and fabrication of 500NBxSch.40 Carbon steel seamless pipe for N1 Nozzle, material is conforming to ASTM A106 grade.

Supply and fabrication of 500 NB AWWA standard carbon steel blind flange 25mm thickness for N1 Nozzle. Dimensions are conforming to ANSI B16.5 standard.

Supply and fabrication of 100NB Carbon steel slip on flange for N2, N3, N4 Nozzle, material is conforming to ASTM A105 grade, 150#

Supply and fabrication of 100NBxSch.80 Carbon steel Seamless pipe for N2, N3, N4 Nozzle, Pipe material is conforming to ASTM A106 grade.

Supply and fabrication of 50 NB Carbon steel slip on flange for N5 & N8 Nozzle, material is conforming to ASTM A105 grade, 150#.

Supply and fabrication of 50NBxSch.80 Carbon steel Seamless pipe for N5 & N8 Nozzle,Pipe material is conforming to ASTM A106 grade.

Supply and fabrication of 40 NB Carbon steel slip on flange for N6 & N7 Nozzle, Pipe material is conforming to ASTM A105 grade, Sch.40

Supply and fabrication of 40NBxSch.80 Carbon steel Seamless pipe for N6 & N7 Nozzle, Pipe material is conforming to ASTM A106 grade.

Rolling of carbon steel plate in to cylindrical Shell. Size of the cylindrical shell: Outer diameter 2400mm x 5000mm length x 12mm thickness. The work includes of blank plate preparation, pre-bending of the material and rolling of the plate into cylindrical shell. Cold bending of steel plate should be done such that no dent marks damage on the plate. Ovality of the cylinder should be within standard tolerance limit and to be match with dished ends inner diameter. The scope of works is includes of Transport & transit insurance charges.

Edge preparation, Fit up and welding of carbon steel cylindrical shell, dished end & nozzle joints shall be GTAW/SMAW process. 100% DP Test shall be done before fit up at plate bevelled edge for circumferential and longitudinal seam joints between cylindrical shell and dished end. All shell and dished end welds shall made using GTAW for root run followed by GTAW/SMAW for subsequent runs and shall be full penetration welds. All the joints shall be subjected to 100% DP Test for Root & Final passes and 10 % Random spot radiography for the butt weld seam joints.

Hydrostatic test of the tank shall be done after complete welding and before rubber lining. Test pressure: 3Kg/cm2 (g) asper ASME Sec VIII Div 1 (UG99). The work includes of pressurization of tank by blinding of all nozzles and arrangement of Pump, tools & tackles etc.

Supply, fabrication and erection of M.S. Structural steel reinforcement pad, support for base plate, and lifting lugs with pad for acid storage tank. Lifting lugs and saddle re-pads should be match with existing saddles as per drawing attached. Materials conform to IS2062 Gr.B.

Rubber lining in all internal surfaces of acid tank shall be lined inside the tank by 5mm thick Ebonite Rubber of shore hardness 70 ± 5° D. The scope of work includes of inside tank surface shall be prepared by sand blasting to SA 2½ finish before rubber lining. Inspection of rubber lining by visual, hardness test, high voltage & high frequency spark test and thickness check. Rubber lining shall be done as per codes IS 4682 Part 1 & BS 6374 Part 5. The scope of work also includes of transport & transit insurance charges to send rubber lining industries.

FRP lining on the outer surface of acid storage tank and nozzles for corrosive protect layer of 2mm thickness.

All external surfaces to be painted with two coat of epoxy based zinc rich primer and two finish coats of high build Epoxy paint of approved shade after final inspection & testing.

Installation of new carbon steel Rubber lined Acid Storage Tank Size: 2400 dia x 6000 mm long x 12mm thickness in MSF plant at NDDP. The installation work includes of dismantling & shifting of existing damaged tank and installation of new tank. The scope of work includes of arranging manpower, Hydra, tools and tackles, slings & belt, foundation bolts, etc.

Supply and erection of M30x100mm length SS316 half threaded bolt with nut and two plain washers.

RAMBAL HITECH ENGINEERS (BID ID -3143254)

Samindra Engineering (BID ID -3149420)

Sri Venkateswaraa Engineering (BID ID -3149935)

Vacuum techniques PVt Ltd (BID ID -3148827)