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

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© 2007 MECON Limited All rights reserved General Technical Specification rope supports may be considered. In exceptional cases where distance exceeds the limiting span, suitable stiffening of pipe section to prevent sagging may be considered. At sliding supports pipe saddle shall be allowed to rest on bearing plate for free movement. In case U-clamps are provided, clearance shall be maintained for pipe movement by providing two nuts on opposite sides. All intermediate supports shall be of sliding type. Anchor supports shall be located based on piping configuration and layout to provide adequate flexibility. Distance between two consecutive fixed supports in straight runs of pipe route should be approx 70 m. However, in special cases it may go up-to 100 m (max.). In no case it should exceed 100 m. However, for steam pipeline it should be limited to 60 m. For pipe dia. above 100 mm cold pull if any during erection may be given as per instructions of the respective drawings. To reduce friction force transmitted to supports, roller supports or anti friction pad supports can also be used. 02.21 FLEXIBILITY ANALYSIS Piping arrangement shall provide for flexibility of lines to take care of the thermal expansion, contraction and equipment settlement. Large reactions or moments at equipment connections shall be avoided . Expansion computation shall be made on the basis of a base temperature of 21.1deg C (70 deg F) and shall cover ( +ve, or –ve ) design temperature(s) as given. i) Flexibility analysis shall meet the requirement of Code ASME B-31.3 (Latest Edition). Analysis shall consider stress intensification factors as per ASME B31.3. ii) Lines which shall be subjected to steam out conditions, shall be designed and analyzed at low –pressure steam design temperature of line whichever is more. Lines having negative design temperature shall be analyzed for both conditions separately. iii) Flexibility Analysis of lines shall be carried out using simplified methods or a comprehensive computer program. Comprehensive computer analysis shall be carried out for the piping for lines connected to equipment like vessels, pumps, filters, furnace, compressors or other strain sensitive equipment. The result of the analysis must satisfy the allowable loading on the nozzles of such equipment. iv) Piping shall be adequately supported for the weight of piping, water, attached unsupported components, wind, seismic, insulation and any other applicable forces. Care should be taken that these supports are adequate to prevent excessive stress, load or moments in either the piping or terminal nozzles of the equipment to which it is connected. Adequacy of supporting of lines having heavy valves shall be checked. The support shall be indicated in the piping General Arrangement Drawings and Isometrics as applicable. v) Safety valve manifolds and downstream of control valves shall be adequately supported to avoid vibrations. Gases & Liquid Fluids Page 26 of 51 GS-02
© 2007 MECON Limited All rights reserved General Technical Specification vi) The following factors shall be considered in the stress analysis - Friction for lines >= 8” NB ; @ steel to steel = 0.3: ( Sliding friction), @ steel to Steel =0.1 (Rolling friction), - Corrosion Allowance. - Initial displacement of nozzles at design temperature(s). - Transverse deflections =25 mm( maximum) - Longitudinal expansion/contraction = 200 mm (maximum) Special care to be taken to check for expansion loops and shoe support lengths shall be finalized accordingly. vii) The following shall always be analyzed using comprehensive computer analysis: a) All lines 4” and above and Design Temp.> 300 deg. C. b) All lines 8” and above and Design Temp. > 150 deg. C. c) Al l lines 16” and above and Design Temp. > 80 deg. C. d) All lines 6” and above and Design Temp. > deg. 65 C that are connected to rotating Equipment, Air Coolers or any other sensitive equipment. e) Any other system/line that stress engineer feels necessary for stress check. The report shall comprise of the following: - Basic input data and calculated conditions. - Layout isometric and supports configuration. - Load cases and calculated member stresses. - Forces, moments and displacements reports. - Spring hangers design parameters. - Allowable Stress Range. Additional requirements ( reinforcement pad etc.) WIND LOAD CALCULATION Wind pressure shall be taken as per IS : 875. In cyclone prone areas maximum wind pressure due to cyclonic wind pressure shall be taken. In case of multiple pipes, for each tier of pipes, largest pipe may be considered for calculating wind load. 02.22 PIPING MATERIAL SPECIFICATION SCOPE This PMS covers the various piping specification for process and utility piping in Metallurgical plants and its related industrial Installation. REFERRED CODES & STANDARDS All piping shall be designed in accordance with relevant latest codes and standards like B 31.1, B 31.3 and different IPSS (Inter plant standard for steel industry) Individual piping material specification has been designed to cover a set of services operating within fixed pressure and temperature. Gases & Liquid Fluids Page 27 of 51 GS-02
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01 FLUID SYSTEM 01.01 Water Supply
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