Floor trap | Points to check during a Plumbing Inspection

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What is Floor Trap?

Floor traps where specified shall be siphon type full bore P or S type Hubless centrifugally cast (Span) iron or PVC having a minimum 50 mm deep seal.

Floor trap, Plumbing Inspection,Install Floor trap,Floor Trap Grating

How to Install Floor trap

The trap and waste pipes when buried below ground shall be set and encased in cement concrete blocks firmly supported on firm ground or when installed on a sunken RCC structural slab. The blocks shall be in 1:2:4 mix (1 cement: 2 coarse sand : 4 stone aggregate 20 mm nominal size).

 Engineer has to provide all necessary shuttering and centering for the blocks. Size of the block shall be 30×30 cms of the required depth.

DWC HDPE Double Wall Corrugated Pipes for Sewerage System

What is Floor Trap Inlet| How to install Floor Trap Inlet?

Bath room traps and connections shall ensure free and silent flow of discharging water. Where required, Engineer should provide a special type of floor or manhole inlet fitting fabricated from G.I. pipe without, with one, two or three inlet sockets welded on side to connect the waste pipe or joint between waste and inlet socket shall be lead caulked. Inlet shall be connected to a C.I. P or S trap.

Floor trap inlet and the traps shall be set in cement concrete blocks where varied in floors as Floor trap for the shower cubicle shall suit site.

What is Floor Trap Grating?

 Floor and urinal traps shall be provided with 100 -150mm square or round Stainless Steel gratings

as with frame and rim of approved design and shape as required at the particular site.

Points to check  during a Plumbing Inspection?

What is a Cleanout Plug?

Clean out plug for Soil, Waste or Rainwater pipes laid under floors shall be provided near pipe junctions bends, tees, “Ys” and on straight runs at such intervals as required as per site conditions. Cleanout plugs shall terminate flush with the floor levels. They shall be threaded and provided with key holes for opening. Cleanout plugs shall be Cast Brass suitable for the Pipe dia. With screwed to a G.I. socket. The socket shall be lead caulked to the drain pipes.

 Waste pipe from appliances

Waste pipe from appliances e.g. washbasins, sinks and urinals shall be of GI pipes medium class conforming to IS: 1239 in typical Toilets kitchens, pantries, and equipment’s and service areas where so required, and as shown on the drawings.

All pipes shall be fixed in gradient towards the connection to stack or drains. Pipes inside all toilets shall be in chase unless otherwise shown on drawings. Where so required and shown on drawings.

Encasing in Cement Concrete

Encasing of pipes is required to provide stability to the line and prevent its damage during Construction.

a) CI soil and waste pipes under floor

Pipes lay in sunken slabs and in wall chases (when cut specially for the pipe) shall be encased in cement concrete 1:2:4 mix (1 cement: 2 coarse sand: 4 stone aggregate 12 mm size) 75 mm in bed and all round.

When pipes are running well above the structural slab, the encased pipes shall be supported with suitable cement concrete pillars of required height at intervals of 1.8 m.

Cutting and making good RCC Core Cutting Works

 Engineer should ensure that all holes cut outs and chases in structural members necessary and

required for the pipe work as building work proceeds. Wherever cut outs , holes are left in the original construction, they shall be made good with cement concrete 1:2:4 (1 cement: 2 coarse sand: 4 stone aggregate 20 mm nominal size) or cement mortar 1:2 (1 cement: 2 coarse sand) and the surface restored as in original condition.

RCC Sleeves/ RCC Cut-outs in Building

Engineer should ensure utilised all cut out and sleeves provided during construction to prevent breaking.

The annular space between the pipe and the sleeve shall be filled up with approved type of fire retardant sealant.

 Tests Of Soil, waste And Vent Pipes in Plumbing

Testing procedure specified below apply to all soil, waste and vent pipes above ground. Entire drainage system shall be tested for water tightness and smoke tightness during and after Completion of the installation. No portion of the system shall remain untested. Engineer must ensure that , at site  have adequate number of expandable rubber bellow plugs, manometers, smoke testing machines, pipe and fitting work test benches and any other equipment necessary and required to conduct the tests.

 All materials obtained and used on site must have manufacturer’s hydraulic test certificate for each batch of materials used on the site.

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Vivek Mishra
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