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Package treatment plant
— Compact biological treatment unit producing higher quality effluent for off-mains properties.
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Pan and tilt camera (drain)
— Drain camera head able to rotate and tilt independently to inspect defects in detail.
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Party wall drainage report
— Drainage report supporting a party wall award where works affect shared or adjacent drains.
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Patch repair (drain)
— Localised resin repair installed inside a pipe to seal a defect at one point.
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Pedestal basin
— Wash basin supported by a ceramic pedestal that conceals waste and supply pipework.
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Penthouse flat
— Top-floor flat in a block, with rooftop terrace and roof drainage considerations.
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Period conversion flat
— Flat created by converting a period property, often with mixed materials and shared stacks.
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Permeable paving
— Porous paving system allowing rainwater to infiltrate through the surface into a sub-base.
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Personal protective equipment (PPE)
— Clothing and equipment worn to protect engineers from drainage work hazards.
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Petrol forecourt interceptor emergency
— Emergency tanker service for saturated petrol forecourt interceptors, preventing pollution discharge.
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Petrol interceptor (forecourt gully)
— Specialised chamber separating fuel and oil from surface water before discharge to sewer.
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Petrol station forecourt
— Fuel filling forecourt with petrol interceptor and strict environmental drainage controls.
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Pipe bursting
— Trenchless replacement method that breaks the old pipe and pulls a new one through.
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Pipe coupling
— Connector joining two lengths of pipe together with a watertight seal.
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Pipe cutter (PVC, clay, cast iron)
— Hand or powered tool that cuts drainage pipes to length cleanly.
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Pipe deburring tool
— Tool used to remove burrs and chamfer the cut end of a drainage pipe.
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Pipe invert level
— Lowest internal level of the inside of a drainage pipe used as a reference height.
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Pitch fibre pipe
— Compressed wood pulp drainage pipe impregnated with coal tar, common from 1940s to 1970s.
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Plug and chain waste
— Traditional waste fitting with a rubber plug attached to the basin by a metal chain.
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Pole camera (visual inspection)
— Camera on a telescopic pole used for above-ground visual inspection.
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Polyester resin (CIPP)
— Cost-effective thermoset resin commonly used in glass-reinforced UV CIPP liners.
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Polymer concrete pipe
— Resin-bonded aggregate pipe offering high strength and chemical resistance for industrial drainage.
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Polypropylene pipe
— Heat-resistant plastic pipe used for above ground waste runs and laboratory drainage.
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Pop-up waste
— Waste fitting with a plug operated by a lever or click mechanism for hands-free use.
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Post-construction drain survey
— CCTV inspection after construction to verify drainage has not been damaged by works.
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Pre-acquisition drain survey
— Drain survey carried out before acquiring a commercial property or development site.
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Pre-construction drain survey
— Drain inspection prior to construction work to baseline drainage condition.
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Pre-purchase drain survey
— CCTV drain inspection commissioned by a buyer before completing a property purchase.
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Pre-tenancy drain survey
— Drain inspection at the start of a tenancy to record drainage condition before occupation.
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Pressure test (drain)
— Hydraulic test that pressurises a drain section to confirm watertightness against a standard.
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Pressure-reducing valve (PRV)
— Valve that lowers incoming mains water pressure to a safe level for the property.
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Property drainage report
— Tailored report covering drainage layout, condition and recommendations for a single property.
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Property management emergency
— Emergency drainage response coordinated by managing agent for blocks of flats or estates.
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PTFE tape
— Thin polytetrafluoroethylene tape used to seal threaded plumbing joints.
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Public Health Act 1936
— Historic UK legislation that introduced enforceable standards for drainage and sewerage.
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Public house kitchen
— Pub kitchen serving meals, with grease management and trade effluent requirements.
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Public sewer
— Sewer maintained by the water and sewerage company serving multiple properties.
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Pull-in-place lining
— Liner pulled through a host pipe and then inflated and cured against the wall.
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Pump station alarm response
— Emergency response triggered by pump station alarm, indicating imminent or actual failure.
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Pump station failure
— Emergency response to drainage pump station failure, with risk of internal sewage backup.
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Pumping station
— Underground chamber with pumps that lift wastewater from low-lying areas into the sewer.
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Pumping station service
— Planned inspection and maintenance of a foul or surface water pumping station.
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Push rod camera
— Drain camera mounted on a flexible rod, pushed manually through smaller pipes.
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Push-button flush
— Button-operated flushing mechanism replacing the traditional toilet lever.
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Push-fit assembly tool
— Lubricant and lever combination used to push large diameter pipes together.
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Push-fit fitting
— Pipe joint with internal grippers and seals allowing connection without tools or solder.
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PVC-U pipe
— Unplasticised polyvinyl chloride pipe, the modern standard for UK domestic drainage.
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PVC-U push-fit pipe
— PVC-U waste pipe with quick-release push-fit joints using internal rubber seals.
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PVC-U socketed pipe
— PVC-U drainage pipe with integral push-fit socket joints sealed by rubber rings.
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PVC-U solvent-weld pipe
— PVC-U pipe joined with solvent cement to form a permanent chemical weld at the socket.
