PIP/Materials/TBT-PIP-012

GRP Pipe Installation

Pipelines & Pipework › Materials › GRP Pipe Installation

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Glass reinforced plastic (GRP) pipe is a composite material used for sewers, process lines, and water mains.
GRP pipes are lightweight compared to concrete or ductile iron but can be brittle if mishandled.
Cutting GRP generates fine glass fibre dust that irritates the skin, eyes, and respiratory system.
Joints are typically made using couplings with elastomeric seals or laminated overwrap connections.
The pipe must be bedded and surrounded with granular material to the specified compaction levels.
Point loading from rocks, concrete lumps, or poorly graded backfill can crack the pipe wall.
GRP pipes must be stored on flat ground with cradles or bearers to prevent deformation.
Laminated joint connections involve resin and glass fibre matting that require COSHH controls.
Deflection testing after installation verifies the pipe has been properly bedded and supported.
UV exposure can degrade GRP pipe surfaces — prolonged storage outdoors should include UV protection.

Dust hazards	Cutting GRP releases glass fibre dust that causes severe skin irritation and respiratory harm without controls.
Product integrity	GRP is brittle under point loads — improper handling, bedding, or backfill can crack pipes and cause joint failure.
Chemical exposure	Laminated joints use polyester or epoxy resins that require COSHH assessment and skin protection.

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See also: Pipeline Safety Awareness | Pipe Material Selection and Handling

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