This standard outlines the code of practice for the installation of Glass Fibre-Reinforced Plastic (GRP) piping systems. It covers essential procedures for handling, storage, jointing methods, and installation techniques for both above-ground and buried applications. The code also specifies requirements for inspection, pressure testing, and commissioning of the completed pipeline.
Code of practice for installation of glass fibre-reinforced plastic (GRP) piping system
Quick Reference Values
Hydrostatic test pressure1.5 times design pressure (Clause 9.2)
Minimum burial depth1.0 m below ground level (Clause 8.2)
Maximum allowable long-term deflection (buried)5% of the nominal pipe diameter (Clause 8.4)
Minimum width of laminated overlay for butt joint150 mm (Clause 6.3.3)
Maximum support spacing (typical)Refer to manufacturer's span charts, dependent on diameter and temperature
Key Formulas
ΔL = α * L * ΔT — Thermal Expansion or Contraction of Pipe
Practical Notes
Surface preparation (grinding, cleaning, and drying) is the most critical step for ensuring the strength and leak-proof nature of laminated or adhesive joints.
GRP has a significantly higher coefficient of thermal expansion than steel; thermal analysis and provision of expansion loops or joints are crucial for above-ground lines subject to temperature variations.
Consult the manufacturer's specific data for cure times of resins/adhesives, as they are highly dependent on ambient temperature and humidity.