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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
What are the three major motions found on shafts, stems and rods |
Rotary Reciprocating Helical |
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Compression packing at times acts as a bearing |
True |
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Why must compression packing throttle the fluid |
In order to cool, seal and lubricate |
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Which types of packing seal in only one direction |
Cup packing U-cup packing V-packing |
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What are the purposes of the saturant (suspensoid) in compression packing |
Fills the voids in the yarn and acts as lubricant |
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Where does most of the wear on pump shafts occur within the stuffing box |
The outermost part of the shaft that is in contact with the packing |
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All automatic packing does not have to be manually adjusted |
False Automatic V-Packing can be adjusted to change the pressure on the packing if the fluid cannot provide sufficient pressure |
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What special condition must be taken into consideration when installing spiral wound packing |
Ensure that the spiral is orientated for shaft rotation |
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Why is more than one ring of jam packing used |
Each additional ring filling the stuffing box throttles some of the fluid pressure; also, if one ring fails another does the sealing |
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A lantern ring (seal cage) is a necessary component in all stuffing boxes |
False; not all compression packing situations require lubrication. Self-lubricating packing such as telfon (PTFE), under most operating conditions, provides satisfactory service life with no lubrication. |
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Radial wound (ribbon) packing can come in braid over braid and interlock braid construction |
False; Ribbons are wrapped around a shaft several times to produce a thicker cross sectional shape |
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Name three metals commonly used in metallic compression packing |
Babbitt Aluminum Annealed soft copper |
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Name two places in which the lantern ring can be located in the stuffing box |
Under the seal water connection and at the bottom of the stuffing box |
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Name four possible causes of premature packing failure |
Wrong type/ mismatched for the application Incorrect size Excessive heat Improper installation |
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Calculate the cross-sectional size of packing for the stuffing box with the following information |
Stuffing box bore = 3.00” (76.2mm) |
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