Requirements of Sanitary Pipe works

PREPARED BY:

ZARINA BT MAT SAPRI

1

REQUIREMENTS OF SANITARY PIPE WORKS

1) Water seals in trapsSuch provision shall be made in the drainage system of a building, either above or below the ground as may be necessary to prevent the destruction under working conditions of the water seal in any trap in the system, or in any appliance which discharge into the pipe work system

2

2) Sizes Of Pipes• The internal diameter of any soil, waste and

vent pipe shall not be less than the outlet of any appliances which discharge into traps or outlet of traps.

• Based on Building Regulation 1985, the internal diameter of soil pipe shall not be less than 100 mm and internal diameter for waste pipe shall not be less than 32 mm.

3

3) Material, Fixing And JointS

•Any soil pipe, waste pipe or vent pipe shall be composed of suitable materials of adequate strength and durability.

•Bends in pipe should have the largest practicable radius of curvature and there should be no change in the cross-section of pipe throughout the bend.

•Pipe should be supported throughout their length, without restricting thermal movement.

4

5

Figure 3.12: Waste pipe from appliance situated on ground floor

A soil and waste pipe should be fixed inside of the building, except a waste pipe from ground floor, where the pipes discharge to the floor gully trap. See Figure 3.12. All pipes should be placed where they are reasonably accessible for maintenance, repair and have access for internal cleansing. Joint should be made so that they remain air-tight and any material used for jointing should not cause electrolytic corrosion.

4) TrapsA trap should be fitted closed to waste or soil appliance, unless the appliance has integral trap. They can be fixed to serve individually (see Figure 3.13) or for a group of appliances ( see Figure 3.14). All the traps should have an adequate diameter water seal and means of access for internal cleansing.(see Table 3.1)

6

Table 3.1: Minimum internal diameter of trap

Domestic type of

fitting

Diameter

(mm)

Domestic type of fitting Diameter

(mm)

Wash basin 32 Drinking fountain 19

Bidet 32 Hotel & canteen sink 40

Sink / Bath /

Shower

40 Urinal bowl 40

Wash – tub 50 Urinal stall( 1 to 2 ) 50

Kitchen waste

disposal

40 Urinal stall ( 3 to 4 ) 65

7

Figure 3.13: Washbasin with individual trap

Figure 3.14: Trap with a group of washbasin

5) TestsA soil and waste system should be capable of withstanding a smoke test or air test for a minimum period of 3 minutes, at a pressure equivalent to a head of water not less than 38 mm head of water ( see Figure 3.15 ). The Building Regulation 1985 requires that during the 3 minutes every trap should maintain a water seal of at least 25 mm.

8

Figure 3.15: Air Test on soil and waste pipe