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30 Cards in this Set
- Front
- Back
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At what temperature is cast iron most malleable? |
It's not malleable. |
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What does DHCISP stand for? |
Double hub cast iron soil pipe |
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How much carbon does good quality cast iron contain? |
3%-4% |
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What are two forms of carbon that may be found in cast iron pipe? |
Chemically dissolved and graphite flakes |
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Why is white cast less brittle than gray cast iron pipe |
The carbon forms a chemical bond with the iron. |
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Gray C.I. is made more corrosion resistant? |
The addition of Silicon. |
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Every cast iron pipe in alberta must have the crush strength of _______ and have _____________ inside and out. |
18 KN & corrosion resistant coating (Pg 4) |
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What type of cast iron pipe are there no hubs on and what lengths do they come in? |
Mechanical joint no hub pipe. They come in 1 1/2", 2", 3", 4" nominal sizes and in 10 ft lengths. |
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A sixteenth bend equals what degree change in direction? |
22 1/2 degrees |
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Can C.I. pipe end fittings be used above and below grade in sanitary and storm systems |
YES |
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What type of joint is ideal for hub and spigot C.I. where ground movement might be a problem? |
Oakum and lead (hot caulking) |
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Name the 3 disadvantages of caulked joints? |
Special tools and equipment are needed, time consuming, special skills are required. |
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What is the oldest method of joining SHCISP? |
Oakum and lead |
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Caulking lead must be _____ pure to use in a SHCISP? |
99.73% |
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How do you know when you have overheated your lead for a caulked joint? |
It forms a purple crust of impurities on top. |
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What would cause the lead in your melting pot to explode? |
Moisture, & cold tools hitting the hot load. |
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What is the melting point of lead in Celsius and farenheit? |
327 C°(620 F°) |
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Before assembling a SHCISP, what should you do? |
Ring test the pipe |
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What are the two most important things to watch for when joining hub and spigot pipe? |
Properly Centre and bottom the pipe into the hub |
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What is the four things oakum doest a joint? |
1) retains molten Lead 2) seals the joint 3) centre's the pipe 4) gives joint flexibility |
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What is the main function of the lead in a lead and oakum joint? |
It is to maintain compression of the oakum and provide the joint with permanent rigidity to hold the joint together. |
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The first pour is ____ in depth and then pounded down ____ the second pour is _____ in depth and should be _____ with the top of the hub. |
1/2", 1/4", 1/2", flush |
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Before hammering or caulking and poured joint what must you do? |
Wait 1 to 2 minute for the lead to cool down. |
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Where positioning or moisture is a problem you can use _________ or otherwise known as _________ to cold caulk the joint. |
Lead wool, shredded lead |
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What happens if you dampen PC4 too much. |
Cement separates ☆ |
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How tight do you tight the gear clamps on a M.J. coupling. |
55-60 inch lbs torque |
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If you were using a compression joint, what are the three steps you would perform before actually joining the pipe. |
File pipe end, clean hub and insert gasket, lubricate assembly |
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What is the pressure rating on cast iron soil piping |
No pressure rating |
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Cast iron soil pipe is coated inside and out with _______ to prevent corrosion. |
BITUMEN |
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Cast iron water service pipe is coated on the outside with _________ and on the inside with _______, _______,_________. |
Bitumen, cement mortar, epoxy paint, bitumen. |
