4 General Technical Specification of Bhilai Steel Plant, SAIL ...
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4 General Technical Specification of Bhilai Steel Plant, SAIL ...

4 General Technical Specification of Bhilai Steel Plant, SAIL ... 4 General Technical Specification of Bhilai Steel Plant, SAIL ...

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© 2007 MECON Limited All rights reserved General Technical Specification on the steel flange shall be removed. When bolting such flanges, a full face gasket shall be used. Equipment terminal flanges, if consist of a different standard, a suitable companion flange shall have to be provided at the connecting points. - Flange drilling shall straddle the natural centre line of pipe. Faces of all flanges shall be 90 0 to the longitudinal axis of the pipe to which they are attached. Slip-on flange when used, shall be welded in accordance with ANSI B31.1 or any other equivalent code. If distorted after welding, the flange shall be refaced. In all cases, flange faces, must be free from particles of weld metal. The flange face and the pipe projecting end shall then be machined to permit both pipe and flange to bear against. - All welding by the electric arc and gas welding process for pipe joints and fabrication shall be done by qualified welders and done according to appropriate IBR, ANSI code / regulations as applicable for welding, subject to accompanying code regulations and standards for filler metal, pressure, temperature and fluid carried. The ends of pipe and welding fittings shall be beveled according to the details shown in ANSI B31.1 or equivalent. All welds shall be made in such a manner that complete fusion and penetration are obtained without an excessive amount of filler metal beyond the root area. The reinforcement shall be applied in such a manner that it will have a smooth contour merging gradually with the surface of adjacent pipe and welded fittings. 02.18 THERMAL INSULATION OF PIPELINES Thermal Insulation The tenderer shall furnish heat insulation for all necessary equipment and piping to efficiently prevent abnormal heat loss from all exposed parts to limit surface temperature within 60 deg.C. Resin bonded mineral wool/slag wool, fiber glass, asbestos ropes and preformed pipe sections, mats/mattresses form of insulation conforming to IS:8183/IS:9842/IS:7413 will be acceptable. However, the grades shall be selected considering respective temperature. In case of using loose insulation, proper care shall be taken at site to get recommended density. Packing density of the insulation wool shall be 150 kg/m3. Insulated surface of all equipment, piping, valves and fittings shall be covered with aluminium sheet of 22 SWG (0.8 mm thick) held in place by self tapping screws of nickel plated type. Apart from the screw, joints shall be further sealed with a suitable sealing compound. All fastening materials such as clips, wires for field weld to the equipment, galvanised wire mesh, metal corner bead shall be provided. Where valves, pipes fittings, flanges, etc. occur, a clear space between end of covering and flange shall be left of sufficient length, to permit withdrawal of flange bolts without interference. Ends of the covering at those joints shall be leveled from the outside covering to the pipe and sealed. Flanges, valves bonnet, end flanges and fittings shall be effectively insulated. Valve & flange insulation covers shall be made in two halves so that these may be removed/refitted readily without interfering with the adjacent covering. Protrusions through the insulation which themselves do not require insulation such as pipe clamps, supports, small piping, instrument take-offs, etc. shall be covered to the same thickness as the adjacent insulation and be tightly sealed except at hanger rods. Ample provision shall be made to prevent damage of insulation due to thermal movement of the pipe or equipment. All the services to be insulated shall be cleaned of all foreign materials such as scale, rust and paint by use of steel wire brushes and steel scrapers. Anti corrosion painting (primer coat) shall be applied on hot surfaces before application of insulation Gases & Liquid Fluids Page 22 of 51 GS-02

© 2007 MECON Limited All rights reserved General Technical Specification Thickness of Insulation Table for Insulation thickness Pipe size (outside dia) Insulation thickness in mm for various temperature ranges Pipe size (outside dia) Upto DN 50mm DN 65 to DN 100mm DN 125 & DN 150mm 100 0 C and below Between 101 and 200 0 C Between 201 and 300 0 C Gases & Liquid Fluids Page 23 of 51 Between 301 and 400 0 C Between 401 and 500 0 C Above 500 0 C 25 50 50 75 100 100 25 50 75 100 125 125 50 75 75 100 125 150 DN 200 mm 50 75 75 125 125 150 DN 250 mm 50 75 100 125 150 150 DN 300 mm 50 75 100 125 150 150 Note: The metallic jacket over the insulation shall be galvanized steel sheet conforming to IS: 277 with following thicknesses: - Pipe sizes up to 300 mm OD : 0.63 mm - Pipe sizes up to 300 mm OD equipment, flanges, valves : 0.80 mm 02.19 LOAD CALCULATIONS AND FLEXIBILITY ANALYSIS Load Calculations Loads from the piping system are transferred to the pipe supports and connected equipment. Depending on the direction of application, loads shall be calculated under two major heads : • Vertical Loads • Horizontal Loads - Vertical load shall comprise of the following : Platforms Condensate collected in pipeline Dust deposition on pipeline Valves, compensators & fittings Supports, ladders, etc. - Live load on platform shall be taken as 500 kg/m 2 - Platform shall be provided at the following locations : • Location of valves • Location of compensators GS-02

© 2007 MECON Limited<br />

All rights reserved<br />

<strong>General</strong> <strong>Technical</strong> <strong>Specification</strong><br />

Thickness <strong>of</strong> Insulation Table for Insulation thickness<br />

Pipe size<br />

(outside dia)<br />

Insulation thickness in mm for various temperature ranges<br />

Pipe size<br />

(outside dia)<br />

Upto DN<br />

50mm<br />

DN 65 to DN<br />

100mm<br />

DN 125 &<br />

DN 150mm<br />

100 0 C and<br />

below<br />

Between<br />

101 and<br />

200 0 C<br />

Between<br />

201 and<br />

300 0 C<br />

Gases & Liquid Fluids<br />

Page 23 <strong>of</strong> 51<br />

Between<br />

301 and<br />

400 0 C<br />

Between<br />

401 and<br />

500 0 C<br />

Above<br />

500 0 C<br />

25 50 50 75 100 100<br />

25 50 75 100 125 125<br />

50 75 75 100 125 150<br />

DN 200 mm 50 75 75 125 125 150<br />

DN 250 mm 50 75 100 125 150 150<br />

DN 300 mm 50 75 100 125 150 150<br />

Note:<br />

The metallic jacket over the insulation shall be galvanized steel sheet conforming to IS:<br />

277 with following thicknesses:<br />

- Pipe sizes up to 300 mm OD : 0.63 mm<br />

- Pipe sizes up to 300 mm OD<br />

equipment, flanges, valves : 0.80 mm<br />

02.19 LOAD CALCULATIONS AND FLEXIBILITY ANALYSIS<br />

Load Calculations<br />

Loads from the piping system are transferred to the pipe supports and connected<br />

equipment. Depending on the direction <strong>of</strong> application, loads shall be calculated under<br />

two major heads :<br />

• Vertical Loads<br />

• Horizontal Loads<br />

- Vertical load shall comprise <strong>of</strong> the following :<br />

Platforms<br />

Condensate collected in pipeline<br />

Dust deposition on pipeline<br />

Valves, compensators & fittings<br />

Supports, ladders, etc.<br />

- Live load on platform shall be taken as 500 kg/m 2<br />

- Platform shall be provided at the following locations :<br />

• Location <strong>of</strong> valves<br />

• Location <strong>of</strong> compensators<br />

GS-02

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