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

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© 2007 MECON Limited All rights reserved General Technical Specification Flow rate for design purpose shall be taken as peak flow rate for the respective section. In case of branches to individual consumers, peak flow rate for the consumers shall be considered. For common branches and main headers, peak flow rate based on consumption pattern/ diversity factor may be used for pipe sizing. Future augmentation of flow rate for common piping shall also be taken into consideration for pipe sizing. 02.04. SELECTION OF PIPE SIZE • Pipelines shall be sized by limiting the gas velocity in the pipeline as per Table 02-01. • Peak flow rate based on the distribution pattern shall be considered for sizing of pipes. • Sizing shall be based on actual flow rate at worst combination of parameters i.e. lowest pressure and highest temperature. • In case recommended velocity is dependant on diameter range, after initial sizing, velocity should be re-checked and if required size should be recalculated. • Nearest higher standard pipe size shall be selected after calculation. For critical applications, pipe sizes should be re-checked after pressure drop calculations and availability of required pressure at consumer point. If required pipe size may be increased to meet the pressure drop criteria. RECOMMENDED VELOCITIES IN CARBON STEEL PIPES A : Low Pressure Fuel Gases Sl. No Nominal Pipe Dia – (mm) Gas Velocity, m/sec (maximum) CO Gas, Mixed BF & BF & BOF Gas Natural Gas Corex Gas 1 20 – 80 2 2 2 2 100 - 250 3 - 4 4 – 5 4 –5 3 300 – 500 5 - 6 6 – 7 5 – 7 4 600 – 800 6 – 7 7 – 8 7 - 8 5 900 – 1200 8 - 10 9 – 12 8 – 11 6 1300 – 2000 11 - 18 13 – 20 12 – 19 7 > 2000 20 - 25 23 - 28 21 - 27 B : Medium Pressure & High Pressure Gases Gases & Liquid Fluids Page 6 of 51 TABLE 02-01 Remarks Medium Pressure Range (kgf/cm 2 g) Gas Velocity, m/sec (maximum) Remarks Nitrogen, Argon, Up to 6 8 –10 See Note 1 Compressed Air, 6 - 16 12 – 16 Instrument Air 16 - 40 Up to 20 Oxygen Up to 16 12 See Note 2 16 - 40 8 LPG Up to 3 8 Acetylene Up to 1.2 8 Up to DN 25 Liquid Fuels All Pressures 1.5 GS-02
© 2007 MECON Limited All rights reserved C : FOR STEAM General Technical Specification Sl. No Fluid Condition Average Velocity, m/sec Up to DN 50 to DN 200mm DN 50mm DN 150mm and above 1 SATURATED AT SUB- ATMOSPHERIC PRESSURE - 10 – 15 15 – 20 2 SATURATED AT 1 TO 7 Kgf/cm 2 (g) 15 – 22 20 – 33 25 – 43 3 SATURATED ABOVE 7 Kgf/cm 2 (g) 15 – 25 20 – 35 30 – 50 4 SUPERHEATED UPTO 7 Kgf/cm 2 (g) 20 – 30 25 – 40 30 – 50 5 SUPERHEATED ABOVE 7 TO 35 Kgf/cm 2 (g) 20 - 33 28 – 43 35 - 55 Gases & Liquid Fluids Page 7 of 51 Remarks Steam piping network comes under the purview of IBR and thickness calculation shall be carried-out as per stipulations indicated in IBR and approval of CIB shall be obtained. 02.05. EXPANSION AND FLEXIBILITY. All Pipe work shall be designed to provide sufficient flexibility against thermal expansion to prevent development of undesirable forces and moments at points of connection to equipment, at anchorage or at guide points. As far as possible, flexibility shall be provided by planning route with change of direction or by the use of bends, loops or off-sets. Whenever self-compensation can not be achieved by pipe routing, provision for thermal expansion shall be made by providing expansion loops or expansion joints as per following criteria: • U loops shall be provided for all low pressure fuel gas piping up to DN 300 size and high pressure piping for all sizes. • For high pressure piping, where U-loop is not possible, bellow type expansion joint shall be provided. Bellow type compensators shall also be provided in low pressure gas lines. While locating the expansion joints following guidelines should be followed: • Bellow compensators should be located preferably in the center of two fixed points. • U-Compensators should be located in between two fixed points with variation in pipe lengths in the ratio of 1:2 (max). • Gland Compensators should be located near the fixed supports to facilitate smooth functioning. • Bellow and gland compensators shall have flanged connection with pipes GS-02
Page 1 and 2: TENDER DOCUMENT NIT No.: DLI/C&E/WI
Page 3 and 4: SL. NO. © 2007 MECON Limited All r
Page 5 and 6: 01 FLUID SYSTEM 01.01 Water Supply
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Page 35 and 36: SL. NO. 1. Hood, Stack and Lance se
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© 2007 MECON Limited All rights re
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01.04 Primer Paint - P4 (Epoxy Base
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03.06 Finish Paint - F6 © 2007 MEC
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Sl. No. © 2007 MECON Limited All r
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QUALITY ASSURANCE PLAN FOR CONTRACT
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CONTRACTOR PROJECT ORDER NO. & DATE
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