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15 Cards in this Set

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What are the three major motions found on shafts, stems and rods

Rotary


Reciprocating


Helical

Compression packing at times acts as a bearing

True

Why must compression packing throttle the fluid

In order to cool, seal and lubricate

Which types of packing seal in only one direction

Cup packing


U-cup packing


V-packing

What are the purposes of the saturant (suspensoid) in compression packing

Fills the voids in the yarn and acts as lubricant

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

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

What special condition must be taken into consideration when installing spiral wound packing

Ensure that the spiral is orientated for shaft rotation

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

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.

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

Name three metals commonly used in metallic compression packing

Babbitt


Aluminum


Annealed soft copper

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

Name four possible causes of premature packing failure

Wrong type/ mismatched for the application


Incorrect size


Excessive heat


Improper installation

Calculate the cross-sectional size of packing for the stuffing box with the following information

Stuffing box bore = 3.00” (76.2mm)