REKABENTUK SISTEM

SANITARI

REKABENTUK SISTEM

SANITARI

Jenis Sistem :

Single stack system

Modified single stack system

Ventilated system

Ventilated stack system

Two pipe system

PENGUNAAN JADUAL & GRAF

DIRUJUK DARIPADA :

“PALING – uPVC SOIL, WASTE & VENT

PIPES & FITTINGS SYSTEM”

BASED ON BS 5572:1978

“CODE of PRACTICE FOR SANITARY

PIPEWORK”

PENGUNAAN JADUAL & GRAF

To Determine Discharge Pipe:

TABLE 6 : Probability data & discharge

units for sanitary appliances connected

to sanitary pipe work above ground

TABLE 7 : Maximum number of

discharge unit to be allowed on

horizontal branches

PENGUNAAN JADUAL & GRAF

To Determine Stack Pipe:

Graph 3 : Proportional flow and

discharge units

CONTOH PENGIRAAN

Example 1 :

Determine the peak flow rate and

diameter of discharge pipe required to

carry the discharges from 44 flats if the

stack loading is to be limited to one-fifth

full bore. Each flat has 1 W.C, 1 wash

basin, a bath and a sink.

CONTOH PENGIRAAN

From TABLE 6:

1 W.C = 12 d.u

1 wash basin = 1 d.u

1 bath = 6 d.u

1 sink = 3 d.u

Total discharge unit/floor = 12+1+6+3 = 22

TOTAL = 44 x 22 = 968 discharge units

CONTOH PENGIRAAN

From GRAPH 3 :

968 discharge units are equivalent to a

flow load of approximately 6.2 litres/sec

Use 125 mm stack

( as 125 mm stack at one-fifth loading

can carry 8 litres/sec )

CONTOH PENGIRAAN

Example 2 :

Determine the peak flow rate and

diameter of discharge pipe to receive

the discharge from 20 W.C.’s and 20

wash basins used by females in an

office block.

CONTOH PENGIRAAN

20 W.C’s (female) x 45 = 900

20 wash basins x 5 = 100

Total discharge units 1000

The flow rate for 1000 d.u = 6.4 litres/sec

Use 100 mm stack

( as 100 mm stack at one-quater loading can

carry 7 litres/sec )

PENGUNAAN JADUAL & GRAF

To Determine Branch Pipe:

TABLE 7 : Maximum number of

discharge units to be allowed on

horizontal branches

Branch pipe < = Stack pipe

PENGUNAAN JADUAL & GRAF

To Determine Stack and Vent Pipe:

TABLE 5 / Graph 3 : Diameter of Stack

pipes

TABLE 8 : Diameter of ventilating pipes

CONTOH PENGIRAAN

Tingkat bawah

Tingkat atas

Bilik air

Bilik air

A B

C D

E F

G

H

Stack pipe

PENYELESAIAN

Branch pipe

Pipe AB

Fr tb 6 pg 33 – Discharge unit = 1bath +

1 Shower +

1 basin

= 6+1+1

=8

Fr tb 7 pg 34 – Size = 38mm

PENYELESAIAN

Branch pipe

Pipe CD

Fr tb 6 pg 33 – discharge unit = 1WC

= 12

Fr tb 7 pg 34 – Size = 38mm but the internal dia of a discharge pipe from wc should be not less than the internal dia of the wc pan outlet to which it is attach, with a min internal dia of 75mm. Refer pg 28.

So, use 75mm pipe

PENYELESAIAN

Branch pipe

Pipe EF

Fr tb 6 pg 33 – discharge unit = 1basin

+1shower

= 1+1 = 2

Fr tb 7 pg 34 – Size = 38mm

PENYELESAIAN

Branch pipe

Pipe GH

Fr tb 6 pg 33 – discharge unit = 1 WC

(domestic)

= 12

Fr tb 7 pg 34 – Size = 75mm

PENYELESAIAN

Stack pipe

– Total discharge unit

= AB + CD =20

Fr tb 5 pg 32 – Size = 50mm

SEKIAN

TERIMA KASIH