Term
| simple loosens obstructions in building sewer |
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Definition
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| cleans building sewers very ideal |
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Definition
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Term
| why build wells on high ground? |
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Definition
| so rain water flows away to keep earth from collapsing and filling in the well. |
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Term
| why put a case around the well? |
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Definition
| to strengthen and keep surface water out |
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Term
| hardness is caused bye what? |
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Definition
| dissolved calcium and magnesium salts. |
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Term
| zeolite beds require a depth of what? |
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Definition
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Term
| how do you regenerate a zeolyte bed? |
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Definition
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Term
| what should the rate of flow through pressure units be? |
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Definition
| 4-8 gpm per foot squared of bed surface |
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Term
| what are 2 types of chloronators |
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Definition
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Definition
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Definition
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Term
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Definition
| propeller and turbine meters |
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Definition
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Term
| cast iron mains less than 8 inches what size should the taps be? |
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Definition
| less than 2 inches no larger than 1/4 the diameter of the pipe |
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Term
| asbestos cement pipe 6 inches should use taps no larger than? |
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Definition
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Term
| on pipes larger than 6 inches taps can be? |
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Definition
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Term
| how should larger taps be made? |
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Definition
| staggered and 10 inches apart |
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Term
| test pipes at what pressure |
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Definition
| 1 1/2 times normal operating pressure |
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Term
| when should you not use chlorine powder? |
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Definition
| on piping that has plastic welded or screwed joint steel pipe |
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Term
| a chlorine residual of what should be maintained and for how long during a test? |
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Definition
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Term
| the lowest outlet should be how far above the ground? |
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Definition
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Term
| how far above the ground should the operating nut be? |
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Definition
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Term
| how large should the water supply for a fire hydrant be? |
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Definition
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Term
| how often should fire hydrants be inspected? |
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Definition
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Term
| which af form deals with fire hydrants |
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Definition
| af form 1027 water flow test record |
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Term
| how far is the isolation valve installed from the hydrant |
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Definition
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Term
| to check a hydrant what must you do? |
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Definition
| tighten the hose connection caps and turn the hydrant two turns to the open position |
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Term
| what is the normal operating pressure in a water distribution system? |
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Definition
| 40 - 75 psi at ground level |
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Term
| how often should shut offs be installed in main distribution loops or feeders and primary branches to fight fires be? |
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Definition
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Term
| when should flow tests be done? |
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Definition
| about the same time of day on each hydrant during periods of ordinary water consumption on the base |
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Term
| when testing fire hydrants there must be at least what percent of a drop in residula pressure on hydrant a before proceeding with the test? |
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Definition
| 25 percent additionally system pressure should never drop below 20 psi |
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Term
| how do you measure velocity flow in a fire hydrant? |
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Definition
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Term
| how should you shut down hydrants? |
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Definition
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Term
| how deep should water mains be burried under grassy areas? |
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Definition
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Term
| how deep should water mains be burried under roads? |
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Definition
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Term
| how deep should water mains be burried under rr tracks? |
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Definition
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Term
| what is used to test a water main before it is put in operation? |
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Definition
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Term
| what is the normal operating pressure in a water distribution system? |
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Definition
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Term
| center cuts do not weaken the strength of the beam unless what? |
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Definition
| the diameter of the opening exceeds 1/3 the distance across the beam |
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Term
| when making an under cut what should you add |
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Definition
| an iron beam fastened with lag screws |
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Term
| for supporting steel pipe any size how far apart should the supports be? |
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Definition
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Term
| vertical copper 1 and 1/2 inches should be supported when? |
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Definition
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Term
| vertical copper larger than 1 1/2 inches should be supported when? |
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Definition
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Term
| horizontal copper 1and 1/2 inches or smaller is supported when? |
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Definition
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Term
| horizontal copper larger than 1 1/2 inches should be supported when? |
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Definition
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Term
| when should plastic pipe be supported |
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Definition
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Term
| lead anchors or expansion shields should be used to support pipe when? |
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Definition
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Term
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Definition
| it occures in copper and zinc alloys a type of corrosion |
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Term
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Definition
| disintegration that attacks cast iron |
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Term
| how long should pressure be held in an air test? |
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Definition
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Term
| which method of corrosion control eliminates the corrosive current flow by applying a stronger current flow in the opposite direction |
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Definition
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Term
| which type of corrosion is caused by electrolytic action of a galvanic cell? |
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Definition
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Term
| a water closed must drain into a building drain that is not less than what? |
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Definition
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Term
| a fizture unit corresponds to what? |
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Definition
| 7.5 gallons or 1 cubic foot of water that ordinary lavatory would discharge into the stack in an interval of 1 minute |
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Term
| how far must the vent piping rise above the fixture flood rim before going horozontally |
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Definition
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Term
| what size is the smallest main vent? |
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Definition
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Term
| main vents should be what? |
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Definition
| 1/2 the diameter of the soil or waste stack it serves or to which it is attached |
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Term
| what is the minimum size piping that you can use for a wet vent? |
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Definition
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Term
| what keeps a diaphram valve closed? |
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Definition
| equal pressore on both sides of the diaphragm |
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Term
| a bubbler should be how high above the floor? |
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Definition
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