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18 Cards in this Set
- Front
- Back
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"Creep" in a gasket refers to...
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the lateral flow of gasket material as a result of compression over time
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When cutting gaskets, the inside diameter of the gasket should be_____larger than the inside of the flange of the pipe
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1/4"
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When installing gaskets on a steam line...
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re-torque flange bolts after steam line has been heated. Not while steam pressure is on
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The compression regulator is the gland, which is also refered to as....
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the gland follower
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With static packing, the compressive force is greatest...
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near the gland follower, and reduces with each packing ring.
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Are packing gland nuts or bolts torqued?
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not generally
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Cellulosics or Vegetable Fiber packing
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Flax
Jute Ramie Cotton- most commonly used vegetable fiber |
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Synthetic Fiber packing
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Fibrous glass
Carbon Aramid Fiber (Kevlar) Flourocarbon (PTFE) |
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Elastomer Packing
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Natural and synthetic rubbers
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Metal packing
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Lead, copper and aluminum
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Most widely used solid packing lubricants
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graphite (3 common varieties)
-flake -amorphous -lump molybdenum disulfide |
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For valve packings, make a skive joint by cutting....
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at a 45° angle to the axis of the shaft
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Never cut packing rings on...
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the shaft
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The butt joints of successive packing rings on a pump must be staggered...
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90° apart
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With packing on a pump, wait ______ minutes between gland adjustments
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30
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Continue adjusting packing on the pump until leakage rate is reduced to....
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32 oz/min
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Two basic types of compression packings used in most valves
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non-graphite
graphite |
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For graphite packing, the term "consolidation torque" refers to...
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the gland or gland fastner torque used to compress the packing for a seal
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