Page 148 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

130 Major Process Equipment Maintenance and Repair

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,Last ring bit- hardest into p1unp.r nd under pressure

Good &sign.
For cool water md fluids With comparable lubricity. >Last ring of mking dm mar of
Ton1 picking length must b Ius thin pluwr stroke length Good &sign. waling-bifa hardest into pluwr
to pmparly wet the 1-1 ring of packing with pumpq.. Mwt of the lubricant mipram into pumw.
a. Standard nonlubriwmd stuffing box Packinp may b. squin. chevron. or nonadiurtable.
b. Stmbrd lubriaad atuffing box
r--Lubricant hd to dumr on
Y A-

'bit ring of packing da mmt of
Good design. sealing-bitn hardest into p1uw.r
Pub lubricant under lit ring-where it is n"dd.d -1. nilh friniDn uuwI Ixc.II h18t, mcChlniUllv-b~n hard into plungmi
and
A11011 use of IDW-P~~UR driptype Iubriutom.
Very linie lubriunt migrates into pum- %on life of wkmg and plungn
Packing may b squim. Olevron. or nonadiurnbla. Poor applimion-improper use of iundard box.
c Almnmtiw 1ubriaW stuffing box d. Standard box used to bind pumpqp
1 ~~emi~fl l-11uum pint *Stuffing-box gland
to
,.Pl"wr
Y L-
highly lolded
Lnr friction and 1-r timmmtum thin unit in Fig. W. Minimal lhkq.. Normally limited to innrminenl duty. SelCldjmtinp.
Lonpcr life of wkmg and p1unp.r~. f. Nonlubricmd, rprinplonkd V-ring packing
Scmdary wking Unnot b adjusted to COmPnUte for war.
a. Modifid plmd followsr to allow Mdoff
r- Lubricmt hd to plum, on
I .tmaph.ric side of mcking
-

I gland adjusts
wking ' ndiw wking
'\ Lait rtng of packing da mwt of ring does mast Of w'l'ng' Secondary llow-preswrel
seailng-bite$ hardest tnto plun(*r packing
Good dnlpl. lw lib. minimil 1.ak.p.. The old standard for high.presrurc. critiul.
Rm lubricmt under 1-1 ring-wlwre It is r*.d.d mon. Prorldn indepasndsnt adjustment of primary and siccwdiry
packing. IPromr edjurtmrnt rlqulms skilled mrhmic.1
All- YI of lw-mwre end driptype Iubr~ulon. Full4zs secondary pckinp.
Selkdjwtinp Positive packing IubricaTion. Long -king and plungw life.
p Lubrlamd aprinplowhd V-ring pecking Nqlipible Ihakage Io atmmnphem. Exullent for volatile fluids.
fi h. Lubriaad two4and stuffing box

.. I - Lubrication is wtiond.

Figure 3-8. Stuffing box designs.