The 1992 edition of IS 10987 outlines detailed practices for designing, manufacturing, testing, and installing horizontal cylindrical steel tanks used for storing petroleum products, both underground and above-ground. The standard emphasizes safe construction, material quality, corrosion resistance, welding methods, and calibration procedures to ensure reliable and cost-effective storage solutions under atmospheric conditions.
Overview
The 1992 edition of IS 10987 outlines detailed practices for designing, manufacturing, testing, and installing horizontal cylindrical steel tanks used for storing petroleum products, both underground and above-ground. The standard emphasizes safe construction, material quality, corrosion resistance, welding methods, and calibration procedures to ensure reliable and cost-effective storage solutions under atmospheric conditions.
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Frequently Asked
IS 10987 permits the use of steel plates and sections conforming to specific Indian Standards such as IS 226:1975 for mild steel, IS 961:1975 for carbon steel, IS 2002:1982 and IS 2041:1982 for pressure vessel plates, IS 2062:1984 for weldable structural steel, and IS 8500:1977 for tank plates. Dimensions must align with IS 1730:1989 and IS 808:1989. Plates meeting Clause 7.1.1 can be used without impact testing for design metal temperatures above -10°C, ensuring appropriate strength and weldability for petroleum storage applications.
The standard mandates a minimum corrosion allowance of 1.5 mm incorporated into the design thickness of tank plates to account for environmental and product-induced corrosion. Thickness values provided include this corrosion margin. Underground tanks require corrosion protection methods such as asphalt coating as per Annex C. Additionally, earthing connections are specified to mitigate static charge risks, enhancing corrosion resistance. Overall, design thickness equals structural thickness plus corrosion allowance, combined with environmental safeguards detailed in Clauses 1.1.1 and 10.
Welding practices must follow IS 812:1957 for terminology, IS 813:1986 for welding symbols, and IS 9595:1980 along with IS 817:1966 for procedures and welder qualifications. Fabrication is primarily by welding, with continuous fillet welds prescribed for longitudinal and circumferential shell joints, shell-to-coupling connections, and attachments such as manhole and nozzle necks. Lifting lugs require fillet welds all around. Thickness ranges from 5 mm to 10 mm, with detailed joint configurations illustrated in Fig. 3 of the code. Electrodes must comply with IS 814:1991.
Before installation, tanks must undergo hydraulic testing at 0.05 MPa (0.5 bar) pressure to ensure leak-tightness. External doping or protective coatings should be applied only after the tank is emptied post-testing, except on concrete-contact areas where it may be done beforehand. Dimensional tolerances, such as overall length within ±0.5%, must be adhered to. Foundations must be sound with steel wear plates for above-ground tanks. These procedures ensure structural soundness and leak protection as per the standard.
IS 10987 requires at least two distinct earthing connections positioned at opposite ends of the tank to safely dissipate static charges. Above-ground tanks have earthing bosses welded to saddle supports; underground tanks have them on end plates. Connections must be mechanically and electrically robust, achieved by riveted, welded, bolted, and soldered joints. Resistance to earth should not exceed 70 ohms, and resistance to earth plates or fittings must be below 20 ohms. Proper earthing reduces ignition risks from static electricity accumulation.
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