The IS 14399 Part 1 and 2 (1996) standard defines specifications for hot-pressed thermosetting glass fibre reinforced polyester resin (GRP) sectional water storage tanks. Part 1 details the design, material characteristics, and testing protocols of GRP panels, ensuring their strength, longevity, and water tightness. Part 2 offers comprehensive instructions on assembly, installation, and testing of these sectional tanks, including hydrostatic and deflection tests, and potability verification to maintain water safety.
Overview
The IS 14399 Part 1 and 2 (1996) standard defines specifications for hot-pressed thermosetting glass fibre reinforced polyester resin (GRP) sectional water storage tanks. Part 1 details the design, material characteristics, and testing protocols of GRP panels, ensuring their strength, longevity, and water tightness. Part 2 offers comprehensive instructions on assembly, installation, and testing of these sectional tanks, including hydrostatic and deflection tests, and potability verification to maintain water safety.
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Frequently Asked
Per IS 14399 Part 1-2, the essential mechanical property values for GRP panels include a minimum tensile strength of 70 MPa, bending strength not less than 100 MPa, and an elastic modulus in bending of at least 6000 MPa. Additionally, the glass content must be at least 25% by weight (with a preferred minimum of 30%), Barcol hardness should be no less than 50 BHU, and water absorption must not exceed 0.5%. These parameters ensure the panels' structural robustness, stiffness, durability, and resistance to water penetration.
The hydrostatic pressure test as per IS 14399 Part 1-2 involves securing the panel onto the hydrostatic testing device, filling the test chamber with water, and eliminating all air pockets. Pressure is then incrementally raised at a rate of 5 kPa per minute until reaching the test pressure, which is at least 200 kPa. During this process, the panel is monitored for any cracking, bursting, or leakage. The panel passes the test if no defects are observed and the maximum deflection remains within permissible limits.
For assembling GRP sectional tanks according to IS 14399 Part 1-2, hot compression moulded GRP panels made from Sheet Moulding Compound (SMC) are used. Fasteners should be corrosion-resistant, commonly stainless steel (grade SS304 or higher), to avoid rust and contamination. Sealing components like gaskets made of neoprene or equivalent elastomers ensure watertight joints and compatibility with potable water at temperatures up to 50°C. Proper adherence to installation procedures guarantees secure assembly and long-term durability.
IS 14399 mandates stringent potability testing to confirm that GRP tanks do not compromise water quality. Tests include evaluations of taste, odor, color, and turbidity changes, as well as assessments for toxic metal leaching, cytotoxicity, and microbiological contamination. These evaluations, performed under defined conditions, guarantee that the tank materials do not adversely affect the safety or quality of potable water.
According to IS 14399 Part 1-2, the dimensional tolerances for GRP panels are ±0.2% for external dimensions and ±0.3° for angular deviations. These strict limits ensure the panels fit accurately during assembly, preserving structural integrity and preventing leaks in the finished sectional tanks.
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