"Positive Displacement Reciprocating Pump Fundamentals - Power And Direct Acting Types" By Herbert H. Tackett, Jr., James A. Cripe, Gary Dyson Page 6
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PROCEEDINGS OF THE TWENTY-FOURTH INTERNATIONAL PUMP USERS SYMPOSIUM • 2008
This type of design, Figure 17, has no manual adjustment; it is
self-adjusting as the packing wears. The design gives long packing
and plunger life and minimal pumped fluid leakage. The design
puts lubricant under the last ring of packing as with the previous
design and allows use of low pressure drip type lubricators.
Packing may be square or “V” ring designs.
Figure 20. Two or Double Gland Lubricated Stuffing Box.
Pumpage leakage is controlled by bleed-off to low pressure point
(suction, flare, etc.) and independent manual adjustment is
required for primary and secondary packing glands. Correct
adjustment requires a skilled mechanic. Other features include: full
size primary and secondary packing, positive packing lubrication,
Figure 17. Spring Loaded Lubricated Stuffing Box.
and most of the lubricant migrates toward low pressure bleed-off
(suction). Packing may be square or “V” ring designs.
The configuration in Figure 18 illustrates the improper use of a
This design, Figure 21, is suitable for cool water and fluids with
standard stuffing box. This is considered a poor application as the
comparable lubricity. It is important that the total packing length is
high friction between plungers and packing causes excess heat and
less than the plunger stroke length to ensure lubrication to the last
as a consequence the machine has short packing and plunger life.
ring of the packing by the pumpage (self-lubricated). Packing may
be square or “V” ring designs. Typical packing style and material
usage can be found in Table 1.
Figure 21. Standard Nonlubricated Stuffing Box.
Figure 18. Improper Use of Standard Stuffing Box Used to Bleed
Table 1. Typical Packing Style and Material Usage.
Leakage to Low Pressure Point.
Figure 19 is an improvement over a standard stuffing box used
to bleed-off leakage to low pressure point although secondary
packing is not adjustable to compensate for wear. Less friction and
lower temperatures are evident when compared to the standard
stuffing box in Figure 18 used to bleed-off pumped fluid leakage to
low pressure point. The design has longer packing and plunger life.
Packing may be square, “V” ring, or nonadjustable designs.
Figure 19. Stuffing Box with Modified Gland Follower to Allow
Bleed-Off to Low Pressure Point.
The double gland lubricated stuffing box in Figure 20 is
standard for high pressure, critical (toxic and volatile) services.
Average packing and plunger life are experienced with negligible
pumped fluid leakage to atmosphere.
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