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BOS 275:2008
P467.40
Plastics inspection chambers for drains and sewers – Specification
Description
This standard specifies requirements for plastics inspection chambers for use at depths to invert not exceeding 6 m in the construction of drainage and sewerage systems. It is applicable to non-man-entry chambers with or without raising pieces and having a nominal cross-section as recommended in BS 752-3.
The chambers are classified into four grades as a function of stiffness and strength, to suit different depths of installation and location for exposure to surface loading. Attention is drawn to BS 124 and BS 4660 which specify requirements for covers and frames for drainage purposes that are applicable to inspection chambers.
The testing requirements in this standard allow chambers to be used at depths of up to 6 m.