Sewage inspection chamber D315/160 with riser 1m and cast iron cover A15

  Datasheet (PDF)

The TeraPlast sewage inspection chamber D315/160 with a 1-meter riser pipe and A15 cast iron cover is engineered for underground gravity sewer and stormwater drainage systems. Designed for utility contractors and infrastructure installers, the modular inspection assembly features a polypropylene straight-flow base with 160 mm elastomeric-sealed connections, an SN4 PVC-KG shaft, and a durable cast iron cover for non-vehicular traffic zones.

Technical specifications

The inspection chamber provides direct access for pipeline cleaning, video camera diagnostic inspection, and maintenance of underground gravity networks. Its factory-engineered straight-through base profile prevents sediment buildup while maintaining laminar hydraulic flow.

• Nominal shaft diameter: 315 mm with a riser height of 1.0 meter.
• Inlet and outlet diameter: 160 mm in-line straight-through flow configuration (180 degrees).
• Operating temperature range: Continuous fluid flow up to 60 degrees Celsius, with short peak surges up to 90 degrees Celsius.
• Chemical resistance: Media resistance across pH 2 to pH 12 and full immunity to biogenic sulfuric acid and hydrogen sulfide (H2S).
• Pressure and groundwater limits: Certified system watertightness up to 0.5 bar, equivalent to 5 meters of groundwater head.
• Cover load rating: Class A15 rated for test loads up to 15 kN (1.5 tonnes).

Materials and standards

The assembly combines high-grade thermoplastics with heavy-duty metallurgy to deliver a robust service life exceeding 50 years. Each component is manufactured in compliance with European piping and foundry specifications.

The injection-moulded polypropylene base provides high impact resistance even at sub-zero temperatures, while the compact PVC-KG smooth riser pipe features an SN4 ring stiffness class to resist surrounding earth pressures. The cast iron closing cover conforms to SR EN 124 standards for installation in Group 1 areas, including pedestrian walkways, courtyards, and green spaces, featuring an anti-slip profiled surface for enhanced safety.

Installation and jointing

The inspection chamber is installed in an excavated trench over a leveled, uncompacted 10-centimeter sand bedding. Mechanical handling is minimal due to the lightweight thermoplastic construction.

Connection to 160 mm smooth sewer pipes is made directly into the base sockets using factory-supplied elastomeric gaskets lubricated prior to jointing. The 315 mm PVC-KG riser pipe can be cut to the required installation depth on site using a fine-toothed saw and chamfered before inserting into the base socket. Backfilling around the shaft is carried out in uniform layers of 20 to 30 centimeters, compacted to a minimum 90% standard Proctor density in green areas, rising to 95% or higher under paved surfaces.