Page 170 - Chemical Process Equipment - Selection and Design

Eccentric Drlve

Hydraulic Fluid

- Discharge pressure (DP)

COOLING WATER
OUTLET 7
CORED PASSAGE
INTO PRECOOLING
ANNULAR SPACE
SEALINO LlOUlD
I
PRECOOLING
OF LEAKAGE

ANNULAR
COOLING
AREA
AROUND
PACKING -
BOTTOMING RING PACKING

(a) (b)

COOLING WATER
INLET

ELEMENTS

ATMOSPHERIC
&TYOSPHERIC SIDE

- i - -&- Kc SHAFT -___-

LSEALING
FACE
(C) (d)
Figure 7.W. 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.

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