RNPCP Chapter 10 to 13

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Number of single compartment sinks or laundry tubs of the same depth, or lavatories that can be served by one trap

Maximum center-to-center distance of adjacent fixtures being served by a single trap

0.75m

Maximum length of tailpiece

0.6m

Minimum horizontal distance of a trap arm to vent

2x trap diameter

Trap arm change of direction without requiring a cleanout

> 90°

For trap arms 75 mm Ø and larger, the change of direction not requiring a cleanout

< 22 1/2°

Maximum developed length between the trap of a water closet from the top of closet ring to inner edge of vent

1.8m

Minimum thickness of exposed and readily accessible drawn brass tubing trap

GA 17 (1.1mm)

Maximum number of slip joints that may be used on the outlet side of a trap

Depth of trap seals

2" to 4"

Minimum water seal for sand interceptors and similar clarifiers

152mm

Rate of flow of an individual grease trap

1.3 to 3.4 L/s

The total capacity of fixtures discharging into a grease trap shall not exceed _____ times the flow rate of the grease trap

2 1/2

Maximum number of fixtures connected to one grease trap

Maximum horizontal distance between the fixture outlet and the grease trap, so grease trap may serve as fixture trap

1.2m

Maximum vertical tailpiece or drain between the fixture outlet and the grease trap, so grease trap may serve as fixture trap.

0.75m

Minimum water seal for grease trap

51mm or 2"

Size of solids to be screened from laundry discharge by means of removable wire basket

12.7mm or larger

Minimum outlet size of a sand interceptor

76mm or 3"

Minimum net opening dimension of the inlet section of a sand interceptor

0.2 sq.m

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

610mm or 24"

Increase in the area of inlet section for each 18.9 LPM or fraction thereof over 75.7 LPM

0.09 sq.m

Minimum area of sand interceptor outlet section

50% of the inlet section

Distance of trap to vent for 32mm Ø

762mm or 30" or 2.5'

Distance of trap to vent for 38mm Ø

1067mm or 42" or 3.5'

Distance of trap to vent for 51mm Ø

1524mm or 60" or 5'

Distance of trap to vent for 76mm Ø

1829mm or 72" or 6'

Distance of trap to vent for 102mm Ø and larger

3048mm or 120" or 10'

Maximum developed length between water closet and vent

1829mm or 6'

Minimum thickness of galvanized sheet metal for rainwater downspout or conductor

GA 26 (0.40mm)

Rainwater piping commencing ____ from the exterior of a building may be suitable approved materials

0.6m or 2'

Extension of roof drain strainers above the surface of the roof

102mm or 4"

Minimum total net inlet area of roof drain with dome-type strainers

1.5x area of the outlet

Minimum total net inlet area of drain with roof deck strainers

2x area of the outlet

Rainfall intensity normally used around Manila area

102mm/hr

Additional for area of 1 wall

50%

Additional for area of 2 adjacent walls

35%

Additional for area of 2 opposite walls

no additional area

Minimum diameter of building sewer, but not less than size of the building drain

152mm or 6"

When gutter has semi-circular bottom, the depth of equivalent area of rectangular gutter

0.392x diameter

When gutter has semi-circular bottom, width of equivalent area of rectangular gutter

0.8862x diameter

The sizing data for vertical conductors, leaders, and drains is based on the pipes flowing ____ full

7/24

Ratio of the side dimension of a rectangular vertical piping

3:1

Public sewer is not available if more than

61m

Minimum diameter of building sewer, but not less than the size of the building drain

152mm or 6"

Recommended slope for building sewer

Allowable slope for drainage piping 102 mm or 152.4mm in diameter given the site constraints

Allowable slope for drainage piping 203 mm or larger in diameter

0.5%

Distance of the building sewer from the outer face of any building foundation or wall

0.6m or 2'

Minimum depth of building sewer below the finish surface of the ground

0.3m or 1'

Aggregate offset angle to be provided with an additional cleanout

135°

Length of building sewer not requiring for a cleanout

< 3m

Maximum distance between manholes

91m

Distance between bottom of water pipe and top of the sewer or drain line

0.3m or 1'

Horizontal distance between the water line and the sewer or drain line

0.3m or 1'

Distance between sewer or drainage piping and water pipes crossing above such drainage pipes

0.3m or 1'

Minimum distance of water pipe joints away from a sewer line

3m or 10'

Distance within the property line where every abandoned building sewer shall be plugged or capped

1.5m or 5'

Maximum number of days from the time of connection to the public sewer an abandoned disposal facility shall be filled

30 days

Minimum horizontal distance of a building or structure from the building sewer

0.6m or 2'

Minimum horizontal distance of water supply wells from the building sewer

15.2m

Minimum horizontal distance of streams from the building sewer.

15.2m

Minimum horizontal distance of on-site domestic water service line from the building sewer

0.3m or 1'

Minimum horizontal distance of public water main from the building sewer

0.3m or 1'

Allowable reduction from water supply wells when constructed of approved materials for use within a building instead of 15.2m

7.6m

Maximum/Minimum FU on 152mm building sewer @ 2%

no minimum

Maximum/Minimum FU on 203mm building sewer @ 2%

3900/275

Maximum/Minimum FU on 254mm building sewer @ 2%

6800/300

Maximum/Minimum FU on 305mm building sewer @ 2%

11200/235

Minimum depth to be filled with molten pig lead

25.4mm

Extension of the finished joint below the rim of the hub

3.2mm

Minimum wall thickness of threaded plastic pipe

Schedule 80

Minimum thickness of exposed wiped surface on each side of a wiped joint, and at least as thick as the material being joined

19mm

Maximum lead content allowable for solders and fluxes in potable water piping

Job-Fabricated female screws

Schedule 80

Enlargement of closet bend from _____ shall be considered an obstruction

76mm to 102mm

Minimum width of continuous and indelibly colored stripe marking for hard drawn copper tubing

6.4mm

Green Copper Tubing

Type K

Blue Copper Tubing

Type L

Red Copper Tubing

Type M

Yellow Copper Tubing

Type DMV

Minimum weight and thickness of sheet lead for lead safe pans

19.56 kg/sq. m.; 1.6 mm thick

Minimum weight and thickness of sheet lead for flashing or vent terminals

14.63 kg/sq. m.; 1.2 mm thick

Minimum wall thickness of lead bends and lead traps

3.2mm

Approximate diameter of closet rings or flanges

178mm or 7"

Width of closet ring or flange

38mm or 1 1/2"

Minimum thickness of caulked-on closet rings or flanges

6.4mm

Minimum overall depth of caulked-on closet rings or flanges

51mm or 2"

Number of bolts per water closet

Slope of threaded-type drainage fittings

Sizes of valves that shall have cast iron bodies

102mm or larger

Sizes of valves that shall have cast brass or bronze bodies

less than 102mm

Sizes of valves that shall be brass and bronze metal

up to 51mm

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Sanitation, Plumbing Design, and Installation 1

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