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NACHI PLUMB
| Question | Answer |
|---|---|
| TRAP DIAMETER | 1 1/4 IN |
| MAX VERT LENGTH OF TAILPIECE | BETWEEN 24 N 36 IN |
| MAXIMUM FLOW RATE FOR WATER CLOSET | 1.6 GPM |
| LAVATAORY GPM | 2.2 AT 60 PSI |
| SHOWERHEAD GPM | 2.5 GPM AT 80 PSI |
| SUPPLY WATER CLOSET GPM | 2.5 GPM AT 20 PSI |
| LAVATORY GPM supply | 0.8 GPM AT 8 PSI |
| The waste from an automatic clothes washer must discharge its water through a(n) ________ into a standpipe or into a laundry tub. | AIR BREAK OR AIR GAP |
| If a standpipe for an automatic clothes washer is used, the standpipe and its trap should be at least ___ inches in diameter. | 2 |
| The maximum horizontal spacing for supporting cast-iron pipe is _____ feet | 5 |
| ABS HORI | 4 FT |
| ABS VERT | 10 FT |
| ALUMINUM HORI | 10 |
| ALUMINIM VERT | 15 FT |
| BRASS HORI | 10 |
| BRASS VERT | 10 |
| CAST IRON HORI | 5 |
| CAST IRON VERT | 15 |
| COPPER AND ALLOY HORI 1 1/4 | 6 |
| COPPER AND ALLOY VERT 1 1/4 | 10 |
| COPPER AND ALLOY HORI AND VERT 1 1/2 | 10 |
| PVC HORI | 4 |
| PVC VERT | 10 |
| STAINLESS STEEL PIPE HORI | 10 |
| STAINLESS VERT | 10 |
| STEEL HORI | 12 |
| STEEL VERT | 15 |
| CLOTHES DRYER EXHAUST VENT MAX SIZE | 35 FT |
| 90 DEGREE BEND IN CLOTHES EXHUAST | 5 FT CUT OFF |
| 45 DEGREE BEND IN CLOTHES EXHASUT | 2.5 FT |
| The exhaust duct should terminate outside the home at least _ feet from any opening, and at least __feet from an air conditioner or heat pump condenser. | 3, 10 |
| The fasteners must not protrude into the inside of the dryer duct more than | 1/8-inch. |
| The exhaust duct should be a minimum of __ inches in diameter. | 4 |
| The vertical distance from the fixture outlet to the trap weir should not exceed \ | 24 inches. |
| The horizontal distance from the fixture outlet to the trap weir should not exceed | 30 inches |
| Standpipes, such as for a clothes washer, should have a minimum height above the trap of __ inches, and a maximum of __ inches. | 18, 42 |
| A water seal of __ inches is standard for most traps | 2 |
| 4 ways to protect trap seal | A potable water-supplied trap seal primer. Reclaimed or grey water-supplied seal primer valve Waste water-supplied trap primer device. Barrier-type trap seal protection device |
| Venting protects the trap seals from | positive pressures and siphonage. |
| what is positive pressure | positive pressure = when pressure in a pipe, duct, or room is higher than the pressure outside of it, causing flow to exit the room. |
| what is negative pressure | Negative pressure occurs when the pressure in a pipe, duct, or room is lower than the pressure outside of it, causing flow to enter the room |
| The minimum size of any vent is | half of the required size of the drain pipe, but not less than 1-1/4 inches (32 mm) |
| A common vent is | one vent that serves more than one fixture, functioning as an individual vent for each fixture |
| Wet venting is | venting single or double bathroom groups or combinations thereof, where one vent pipe may serve all the fixtures connected to the wet vent. |
| Waste-stack venting is | venting individual fixtures through a drainage stack, and the over-sized stack functions as the vent. |
| Circuit venting is | venting up to eight fixtures with a single vent pipe |
| Island-fixture venting has a vent installed below | the flood-level rim of the fixture before rising to connect to another vent. |
| The vent stack is t | he vertical vent pipe installed primarily for providing air circulation to and from any part of the drainage system, which is the piping in a home that carries away sewage or other liquid waste. |
| A local vent stack is a | vertical pipe into which other pipe connections are made from the fixture side of traps. Vapor or foul air is removed from the fixture through the local vent stack. |
| The building drain is | the lowest pipe of a drainage system into which drains the soil, waste, and other drainage pipes from inside, and it extends at least 30 inches beyond the exterior building walls. This is extended into the building sewer. |
| whats the part that you can see sticking out the roof called? | stack vent |
| What slope and distance from vent is needed for a 1 1/4 in trap | slope 1/4 in per foot vent distance 5 ft |
| What slope and distance from vent is needed for a 1 1/2 in trap | slope 1/4 in per foot vent distance 6 ft |
| What slope and distance from vent is needed for a 2 in trap | slope 1/4 in per foot vent distance 8 ft |
| What slope and distance from vent is needed for a 3 in trap | slope 1/8 in per foot vent distance 12 ft |
| What slope and distance from vent is needed for a 4 in trap | slope 1/8 in per foot vent distance 16 ft |
| Where the roof area can be occupied, the vent should extend at least _____ above the roof to prevent noxious sewer gases from harming people. | 7 feet |
| with winter outdoor 97.5% design temperatures of 0° F (-18° C) or less; therefore, a minimum __________ vent will be needed. | 3-inch-diameter |
| An open vent terminal from a drainage system shall not be located less than __________ directly beneath any door, openable window, or other air intake opening of the building or of an adjacent building | 4 feet (1219 mm |
| nor shall any such vent terminal be within _______ horizontally of such an opening unless it is not less than ______ above the top of such opening. | 10 feet (3048 mm) , 3 feet (914 mm) |
| Vent terminals that pass through the exterior wall must terminate at least ___ from a lot line and at least ___ above the highest grade elevation within ___ in any direction horizontally of the vent terminal. | 10, 10, 10 |
| A side-wall vent should have a __________ over the opening to prevent birds from building nests and rodents from entering the drainage system. | screen or protection |
| Particular drainage fittings have been designed with patterns providing ________ resistance to flow | the least |
| The square shape of a cleanout ________ the possibility of stripping the plug during removal. | minimizes |
| Drainage pipe cleanouts should be installed not more than _________ apart in horizontal drainage lines measured from the upstream entrance of the cleanout. | 100 ft |
| The sump pit should not be less than ____ inches in diameter and ____ inches deep. | 18, 24 |
| The discharge pipe on a sump pump should have a _________ installed to prevent previously pumped discharge from returning to the pump. | check valve |
| he joint between different types of plastic made with solvent cement will not be reliable because the chemical composition of the joint will not ____________ | be homogenous |
| The design of a drainage system is based on _____ flow in the drainage piping | uniform |
| (trenching) Pipe is protected from damage by proper | back-filling |
| Back-filling is done in___ layers, with each layer being tamped into place | 6-inch |
| arge rocks and chunks of dirt should not be located within _______ of the trenching pipe. | 12 inches |
| Pipe materials allowed above ground inside, underground inside, and underground outside | ABS plastic sch 40, cast iron, copper, pvc sch 40, and stainless steel |
| Where are you allowed to use asbestos-cement pipe? | underground both, not aboveground |
| when can you use concrete pipe? | undergound outside |
| when can you use galvanized steel piping? | above ground inside for 6 in |
| when can you use polyethylene PE plastic? | underground outside |
| when can you use vitrified clay pipe | underground outside |
| slope Drainage fittings should be designed to maintain a | one-quarter unit vertical in 12 units horizontal grade (2% slope). |
| The joint between different types of plastic made with solvent cement is not reliable | because the chemical composition of the joint will not be homogeneous. |
| An O-ring has no resistance and can be | pushed out of the joint. |
| A cleanout plug can be made of | brass or plastic. |
| The minimum clearance in front of cleanouts should be __ inches on pipes ____ and larger, and _____ on smaller pipes. | 18, 3 inches. 12 inches |
| A full-open valve should be installed on the ______ side of the check valve. This valve is used to _________________________ | discharge, prevent waste and gases from coming back toward the pump when maintenance or repair is performed on the check valve or the pump/ejector unit. |
| The capacity of the sump should not exceed _________ discharge load from the piping system connected to the sump under normal use. | one-half of a day’s (12 hours') |
| he minimum capacity of the sump should be such that the pump operates for at least _____ per pumping cycle to prevent short-cycling and overuse of the equipment | 15 seconds |
| The level of the effluent in the pit should not rise within _____ (51 mm) of the gravity drainage pipe entering the pit. | 2 inches |
| Sumps, other than pneumatic ejectors, should be vented with a minimum _____ diameter vent pipe | 1-1/4-inch |
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