What is the minimum required glass content in a GRP panel?

Minimum 30% by mass, as per Table 1 of IS 14399 (Part 1).

Are these tanks suitable for drinking water?

Yes, provided the materials are of potable grade. The resin system should conform to IS 10146 for contact with drinking water.

What are the standard panel sizes specified?

The code covers panels of 1000 x 1000 mm, 1000 x 500 mm, and 500 x 500 mm. The 1000 x 1000 mm panel is the most common.

Does this standard cover the bolts, nuts, and sealant?

No, Part 1 of this standard is for the GRP panels only. Part 2 gives guidelines, and fasteners/sealants should be as per manufacturer's specifications, typically using stainless steel or galvanized steel bolts.

IS 14399

: 2000

Hot Press Moulded Thermosetting Glass Fibre Reinforced Polyester Resin (GRP) Sectional Water Storage Tanks, Part 1: panels, Part 2 Guidelines for assembly, installation and test

CurrentSpecializedSpecificationBIMMEP · Sanitary Appliances and Water Fittings

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This standard, in two parts, covers GRP sectional water tanks. Part 1 specifies requirements for the hot press moulded panels, including materials, dimensions, and physical properties like strength and water absorption. Part 2 provides guidelines for the assembly, installation, and testing of the complete tank.

Hot Press Moulded Thermosetting Glass Fibre Reinforced Polyester Resin (GRP) Sectional Water Storage Tanks, Part 1: panels, Part 2 Guidelines for assembly, installation and test

Quick Reference Values

Minimum Barcol Hardness (Scale 934-1)40

Minimum Glass Content by mass30%

Maximum Water Absorption20 mg

Minimum Tensile Strength70 MPa

Minimum Flexural Strength100 MPa

Minimum Flexural Modulus6000 MPa

Standard Panel Size1000 x 1000 mm

Practical Notes

Ensure the supporting structure (concrete plinth or steel frame) is perfectly level and complies with Part 2 guidelines to prevent panel stress and leakage.

The most common failure points are sealant application and incorrect bolt torque during assembly; these must be strictly supervised.

Always verify the manufacturer's ISI marking on each panel to ensure conformity with the standard.