Drainage: Traps, Interceptors, Slope & Change in Direction

Common P Trap

2” deep water seal

Deep Seal P Trap

4” deep water seal

Stand Trap

for slop sink, fixture built low in the ground

3

Traps Required: 1 trap may serve

• how many single compartments sink with the same depth

0.75

Traps Required: 1 trap may serve

• 3 lavatories adjacent to each other not more than _m apart

0.6

Traps Required: 1 trap may serve

• in no case any tailpiece or connections shall exceed _m long

51 mm (2”)

Minimum trap seal deep

102mm (4”)

Maximum trap seal deep

30 mins

Grease Interceptor retention time

24 hours

Septic tank retention time

1

Grease Traps

• Required Flow - 20 gpm

• Grease Retention Capacity - 40 lbs

2

Grease Traps

• Required Flow - 25 gpm

• Grease Retention Capacity - 50 lbs

3

Grease Traps

• Required Flow - 35 gpm

• Grease Retention Capacity - 70 lbs

4

Grease Traps

• Required Flow - 50 gpm

• Grease Retention Capacity - 100 lbs

Sand Interceptor

• 2 sq. ft

• 610 mm depth min

Oil Separators

• 610 mm depth

• 457mm water seal depth

2%

Slope of <100 mm diameter pipe for sewer

1%

Slope of 150 mm diameter pipe for sewer

0.5%

Slope of >200 mm diameter pipe for sewer

22 ½

1/16 bend in degrees bend

45

1/8 bend in degrees bend

60

1/6 bend in degrees bend