Packed stuffing box

Lantern Gland Stuffing Box Gland Figure 3-17. Packed stuffing box. (Courtesy Dean Brothers Pumps, Inc.)... 

Shaft seal requirements and two common types of seals, packed stuffing boxes and simple mechanical seals, are described and discussed in this section. A packed box typically is used on slow- to moderate-speed machinery where a slight amount of leakage is permissible. A mechanical seal is used on centrifugal pumps or other type of fluid handling equipment where shaft sealing is critical. 

Two sealing devices are described and discussed in this section packed stuffing boxes and simple mechanical seals. 

This section describes the installation procedures for packed stuffing boxes and mechanical seals. 

This procedure provides detailed instructions on how to repack centrifugal pump packed stuffing boxes or glands. The methodology described here is applicable to other gland sealed units such as valves and reciprocating machinery. 

Figure 7.13. Types of seals for pump shafts, (a) Packed stuffing box the sealing liquid may be from the pump discharge or from an independent source, (b) Water cooled stuffing box. (c) Internal assembly mechanical seal the rotating and fixed surfaces are held together by the pressure of the pump liquid which also serves as lubricant a slight leakage occurs, (d) Double mechanical seal with independent sealing liquid for handling toxic or inflammable liquids.

Design features Fixed tubesheet Return bend (U-tube) Outside-packed stuffing box Outside-packed latern ring Pull- through bundle Inside split backing ring... 

Fig. 28. Improved variants of equipment and wellhead connections for steam injection wells a-packing (stuffing) box to insure reciprocal mobility of casing and tubing strings b and c-telescopic equipment to enable the extension of tubing string, without raising of the pump (b) and the process of withdrawl of reservoir liquids (c).

Stuffing box packing Stuffing box follower Bor-nut to tighten stuffing box... 

The following precautions should be taken in repacking a packed stuffing box ... 

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