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15 Cards in this Set
- Front
- Back
Four functions of a seal |
Retain lubricants or liquids Exclude contaminates Seperate fluids Confine pressure |
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State the following terms Positive seal Non positive seal |
Prevent even I minute amount of fluid to pass Allows a small amount of internal leakage to provide |
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List an example for of seal for postive and non positive |
O-ring Gland packing |
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Definition of a static seal |
A seal that is compressed between ridigly conncent parts is a static seal |
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Difference between a jointing and a gasket |
Gasket when the jointing material is cut to shape it is called a gasket Jointing material used between a bolted surface to form a seal |
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Example of the flowing type of jointing materials Rubber Copper Cork Fibre |
Flanges of water pipes and pumps Steam pipe flanges and high pressure Gear boxes, fuel pumps, engine gaskets Washes for oil, water and fuel tanks |
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Definition the term gasket |
A device for affecting a seal between two surfaces |
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Two types of bolted joint assembly |
Floating assembly pipe flange with gasket Ridid assembly o ring |
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Forces acting on a floating assembly joint |
Initial force Hydrostatic force Residual force Residual stress |
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What does hydrostatic force mean |
Force trying to separate the flanges due to pressure |
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What does stress relaxation mean |
Occur in the gasket after a long time and on heat and is the loss if elasticity |
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When making gaskets why should you not use bell pein hammers |
Possiblity of damaging the surface to be sealed and compressing the gasket |
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How to mark a gasket |
Mark the shape of a gasket by tracing around the edges with a pencil or marker or alternately cost the surface with a light snare of oil or bearing blue |
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What pressure is a spiral wound gasket designed to be used at |
300psi and above |
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Method of fastening that prevents the swg from unwinding |
Spot wielding |