Installation of Traps:-


1.    Select the right type of closet (Indian or western type) and then choose the type of trap required. Western type water closets require inbuilt traps and Indian water closets require external traps.

2.    Choose the right type of trap required. This needs to be selected as per the outlet angle (from “P”,” Q”, and “S”).

3.    Embed the trap on a firm base of concrete slab levelled with cement mortar and set it to the level of the floor.

4.    Indian water closets should be installed in position with the trap at the desired place as per the design.

5.    All mouths or openings must be closed to prevent any construction dirt from entering.

6.    Waterproofing work can then be carried out as required.

7.    In case of the western style closets, the outlet pipe should be fixed in position. The connection is done only at the final stage.








One Pipe System


(a)    There are two stacks, a soil-cum-waste stack and the ventilation stack;

(b)    Sullage wastes (from bath, kitchen and washbasin) and sewage are collected together;

(c)     Traps of all appliances, soil and waste, are fully ventilated;

(d)    Deep seal traps of 40-mm water-seal for waste appliances and 50-mm for soil appliances is recommended.





Two Pipe System


(a) Four pipelines are used – one carrying soil, one carrying kitchen / bathroom wastes, and two vent pipes;

(b) Sullage (wastes from kitchen, bath and washbasin) and sewage wastes collected separately;

(c) Sullage can be used for gardening by treatment;

(d) Suitable where fitments are scattered i.e. WC, washbasin and baths are widely separated;

(e) Sullage waste connected to sewage through a gully trap.

(f) Waste appliances are provided with vent system and gully trap works as second line of defence.






–          Sanitation lines are not concealed & are exposed to sunlight, which leads to expansion & contraction due to  temperature variations.

–          Finolex introduced pipes and fittings with Selfit & integrated ring option which  gives an optimum sanitation system solution. Here Integrated Ring pipes & fittings take care of the expansion & contraction. Selfit fittings make it cost effective without affecting the performance. Finolex also recommends having all horizontal lines with selfit jointing.


·         This is because:

·         These lines are prone to water logging.

·         These lines are mostly buried under the flooring &/or not exposed to sunlight.

·         They can be of short lengths

·         SWR pipes and fittings are not concealed and are always exposed to external surfaces and sunlight.

·         The diurnal temperature at many places varies from 5 to 20 degrees C, which naturally leads to expansion & contraction of pipes.

·         The expansion & contraction occurs more in vertical lines. Therefore rubber ring jointed pipes are most suitable.

·         Finolex recommends Selfit joining for all horizontal wastewater lines.

·         Adequate support must be provided to vertical as well as horizontal pipelines.

·         Expansion joints must be provided to accommodate thermal expansion.

·        Pipe brackets must be used to anchor expansion joints.

·         Horizontal pipes require closer support compared to vertical pipes.

·         Pipes should always be supported at the joints and fittings (bends, branches etc.).


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