CHAPTER 10: TRAPS AND INTERCEPTORS

integral traps

Each plumbing fixture, excepting those having_________, shall be separately trapped by an approved-type waterseal trap. Not more than one trap shall be permitted on a trap arm.

Integral Trap

Type of trap for Water Closet

P-Trap

Type of trap for Lavatory and Shower drain/Floor drain

Bag Trap

Type of trap for Bath tub

0.75 m

One trap can served maximum of 3 single compartment laundry sinks or laundry tubs having same elevation and distances not more than ___________apart. trap is centrally located when three (3) compartments are installed.

Food waste disposal

________ unit shall connected to a separate trap

clotheswasher or laundry tub

No ___________ shall be connected to any trap of a kitchen sink

0.6 m

The tailpiece shall be as short as possible, but in no case shall the tailpiece from any fixture exceed________in length.

2 x trap arm pipe dia

Trap arm lenght shall not be less than _______

90 degrees

CO is not require on trap arm change of direction if does not exceed _________

no C.O. required

Change of direction not exceeding 22.5 degrees _______

CO required

Change of direction greater than 22.5 degrees ___________

water closet and urinal

Vent pipe except ________ shall not be below the weir of the trap

0.76m

Trap arm: 32 mm Dia, Distance to vent ? (min 2% slope)

1.07m

Trap arm: 38 mm Dia, Distance to vent ? (min 2% slope)

1.52m

Trap arm: 51 mm Dia, Distance to vent ? (min 2% slope)

1.83m

Trap arm: 76 mm Dia, Distance to vent ? (min 2% slope)

3.05m

Trap arm: 102 and larger Dia, Distance to vent ? (min 2% slope)

1.8 m

The developed length bet. Closet ring or Closet Flange to the inner side of the vent shall not be more than _______

discharging urine

Gauge # 17 B&S or 1.1 mm thick can be use as a trap, except fixtures _____

Prohibited Traps

"S" trap, Bell and Crown Vented traps, Double trapped fixture

vent

No Drum trap shall be isntalled with out ____

51mm (2") to 102mm (4")

Water Seal = _________ deep measured from the dip to the crown wei

152 mm

interceptors or clarifiers for sand and similar heavy solids shall be so designed and located as to be readily accessible for cleaning and shall have a water seal of not less than __________deep.

food waste disposal

no _______unit shall be connected to or discharged into any grease interceptor or grease trap.

6 ft / 1829 mm

WC trap (developed length of the Closet Flanged or Closet ring to the vent pipe) max ________

slip joint fitting

Only 1 approved _____ may be used on the outlet side of a trap

12.7 mm

Laundry equipment that does not have integral strainers shall discharge into an interceptor having a wire basket or similar device, that is removable for cleaning and that will prevent passage into the drainage system of solids ________ or larger in maximum dimension, such as string, rags, buttons, or other solid materials detrimental to the public sewerage system.

brick,concrete, prefacated coated steel

Sand interceptor must be made of ___________ or other water tight material

76 mm

Inlet and outlet of the pipe shall have a minimum of ______ diameter

0.2 sqm

The sand interceptor shall have a minimum dimension of _______ for the net free opening of the inlet section

610 mm

The sand interceptor minimum depth under the invert of the outlet pipe ___________.

0.09 sqm

For every 18.9 L/min or 75.7 L/min additional flow, a ________ increased in the area of the sand interceptor

50% Inlet Area

sand interceptor Outlet section = atleast _______

762 mm

H Trap arm Except for WC : (Trap Arm) 32mm, Distrance trap to Vent?

1067 mm

H Trap arm Except for WC : (Trap Arm) 38mm, Distrance trap to Vent?

1524 mm

H Trap arm Except for WC : (Trap Arm) 51mm, Distrance trap to Vent?

1829 mm

H Trap arm Except for WC : (Trap Arm) 76 mm, Distrance trap to Vent?

3048 mm

H Trap arm Except for WC : (Trap Arm) 102 larger , Distrance trap to Vent?

18 kg

Grease Trap Capacity: Rqrd rate of flow 76 L/min, Grease Retentions Capacity ?

23 kg

Grease Trap Capacity: Rqrd rate of flow 95 L/min, Grease Retentions Capacity ?

32 kg

Grease Trap Capacity: Rqrd rate of flow 132 L/min, Grease Retentions Capacity ?

45 kg

Grease Trap Capacity: Rqrd rate of flow 189 L/min, Grease Retentions Capacity ?

Number of meals per peak hour X Waste flow rate X retention time X storage factor

Grease Interceptor size formula

6 gal flow

Waste Flow Rate: With dishwashing machine

5 gals flow

Waste Flow Rate: wo dishwashing machine

2 gals flow

Waste Flow Rate: Single service kitchen

1 gals flow

Waste Flow Rate: foodwaste disposer

2.5 hrs

Retention Time: Commercial kitchen waste dishwsher

1.5 hrs

Retention Time: Single service kicthen single serving

1

Storage factors: (fully equipped commercial kicthen) 8 hrs operation

2

Storage factors: (fully equipped commercial kicthen) 16 hrs operation

3

Storage factors: (fully equipped commercial kicthen) 24 hrs operation

1.5

Storage factors: Single service kitchen

flow control device

Any fixture having grease trap shall have a_________

1.3 L/s to 3.4 L/s

No grease trap is required having a flow rate of ___________

2-1/2 x certified L/min

The total capacity of fixtures discharging into such any grease trap shall not exceed ______ of the grease trap

1.2 meters

Grease trap installed with inlet more than ______ lower than any outlet shall have a flow rate of not less than 50% of that given in Table 10.2 or more than 4 fixtures connected to it

0.75 meters

Grease trap can be used as an outlet when the distance bet. The outlet and the trap shall not exceed 1.2 meters or the vertical tail pipe should not exceed ______

51 mm

Water seal for grease trap shall not be less than ______