Page 60 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Installation, Maintenance, and Repair of Horizontal Pimps 45

Stuffing Box With Mechanical Seal

Most pump stuffing boxes are designed to accommodate different
types and makes of mechanical seals. The modified cartridge design al-
lows easy installation and additionally provides protection against sleeve
movement on high suction pressure application (Figures 1-15 and 1-16).
After the bearings have been disassembled, the mechanical seals can be
removed as follows:

1. Unbolt seal gland and slide off shaft.
2. Loosen socket head set screws in sleeve seat and remove nut with
spanner wrench.
3. A 10-24 tapped hole is provided in key to assist in removing sleeve
key.
4. Pull sleeve and mechanical seal rotating assembly off shaft.
5. Remove mechanical seal from seal sleeve. Mechanical seals have
lapped faces-handle with care; keep wrapped in clean cloth and
avoid contacting seal faces.
6. Remove sleeve gasket (15-3).
7. Pull stationary mechanical seal from gland (07).
8. Remove gland gasket and mechanical seal O-ring.
9. Press throttle bushing from seal gland.

After inspection has been carried out and all parts are cleaned and cor-
rected as necessary, the mechanical seal can be reinstalled.

1. Press throttle bushing into seal gland.
2. Insert stationary seal face into gland, being careful not to damage
O-ring.
3. Slide sleeve gasket against shaft shoulder.
4. Install rotating assembly of mechanical seal on shaft sleeve. For
special seals follow instructions given separately; for standard
seals use the following procedure:

a. Wipe both lapped sealing faces with a clean, soft cloth.
b. Apply some oil to sleeve and slide rotating member onto
sleeve. Be careful not to put oil on lapped seal faces.
c. Position rotating member on sleeve as indicated on detailed seal
drawing to be supplied by seal manufacturer.
d. Tighten set screws which hold rotating member to sleeve.
5. Oil pump shaft and slide sleeve and sleeve assembly against shaft
shoulder.