- 4" - (value unspecified, likely varies based on local codes).
5. Type of fitting for continuous waste and venting of back-to-back lavatories:
- Answer: Double fixture fitting.
6. Depth for filling caulk joints for cast iron bell and spigot:
- Answer: 1" filled to a depth of not less than molten lead.
7. Fittings to connect horizontal drainage to another horizontal drainage line:
- Answer: Wye, Combination Wye with 1/8 bend, Long sweep.
8. Cleanout locations required by code:
, - Answer:
- Each horizontal drainage pipe must have a cleat at its upper terminal.
- Required for horizontal runs more than 100'.
- For each horizontal change of direction exceeding 135°.
- Front Main Cleanout.
9. Maximum distance a cleanout can be spaced apart:
- Answer: 100'.
10. Minimum clearance in front of a cleanout:
- For 2" or less: 12"
- For 2" or more: 18".
11. Maximum distance underfloor cleanout can be from an access door:
- Answer: 20'.
12. Protection from backflow for fixtures below manhole cover:
- Answer: Back Water Valve.
13. Minimum sewage ejector discharge capacity for water closets:
- Answer: 20 gallons per minute.
14. Minimum size discharge pipe for a single dwelling ejector:
- Answer: 2".
15. Minimum clearance for the lowest inlet connected to the ejector pump:
- Answer: 2" clearance from the high water or starting level of the sump.
16. Can macerating toilet systems replace sewage pump systems?
, - Answer: Yes, with prior approval of the AHJ.
17. Minimum size discharge pipe for a macerating toilet system:
- Answer: 3/4".
18. Minimum pitch required for a 2" horizontal drain:
- Answer: 1/4" per foot.
19. Type of valve required on discharge line from an ejector pump:
- Answer: Swing check valve and gate or ball valve.
20. Location of the gate valve on the discharge line of an ejector pump:
- Answer: Downstream of the backwater valve.
21. Proximity of drainage connections to changes in direction for suds-producing fixtures:
- Answer: Drainage connections shall not be made within 8' of a vertical or horizontal change in
direction.
22. Testing requirements for the DWV system (Water and Air):
- Answer: 10' head of water for 15 minutes and 5 psi for an air test.
23. Public sewer availability criteria:
- Answer: When the dwelling is more than 200' away from the sewer.
24. Building sewer starting point:
- Answer: 2' away from the building.
25. Determination of building sewer size:
- Answer: Based on DFUs (Drainage Fixture Units).
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