F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-31
Coolant System Requirements
P1
P1
P1
P1
T1
F1
F1
Packing
Case
F
IGURE
4-10 P
ACKING
C
OOLING
S
YSTEM
-
T
YPICAL
Packing
Case
Coolant
Circulating
Pump
Throttling/
Isolation
Valves
Cooler
P1 = Pressure Indicator
T1 = Temperature Indicator
F1 = Flow Indicator
The coolant flow is to be num-
ber of packing cases x 1 US gal-
lon per minute, minimum for
each inch of piston rod diameter
(No. cases x 0.149 L/min for
each mm of piston rod diame-
ter). Based on using a treated
50/50% water/glycol solution.
Example: JGJ/2 with 1.5 inches
(38.1 mm) diameter piston rod.
2 x 1 x 1.5 = 3 gallons per min-
ute (2 x 0.149 x 38.1 = 11.3 L
per minute).
The cooler should be sized for
number of cases x 70 BTU/min-
ute/inch of rod diameter (No.
cases x 0.05 kW/mm of rod diameter). The pressure drop across the system is to be greater
than 30 psi (2.1 bar). The coolant into the packing is not to exceed 130°F maximum (54°C
max.). A lower coolant temperature will increase the amount of heat that can be transferred
to the coolant. A lower coolant temperature is better in high pressure applications.
Force Feed Lubrication System - Description
The force feed lubrication system provides oil to the compressor cylinders and the piston rod
packings.
Oil is supplied to the 150 micron sintered bronze filter on the suction side of the force feed
lubricator pump directly from the pressure side of the frame lube oil system, or from an over-
head tank. Oil from the filter is supplied to a header and to the lubricator pumps on the lubri-
cator box.
The lubricator box has its own oil reservoir to lubricate the worm gear and cam. The reservoir
is self-contained and is not fed by the lube oil system. A sight glass on the lubricator box will
show the oil level in the lubicator reservoir.
There are 1/4 inch tube fitting connections in the discharge lines near the force feed lubricator
pumps through which the force feed lubrication system may be primed.
Next in the discharge lines are blow-out fittings with rupture disks. If there is a blockage in the
system, the pressure build-up will rupture the disks. Venting the system through the rupture
disk causes the no-flow shutdown switch to close.
The oil then travels to the distribution blocks. It is here that the lubricating oil is apportioned
to provide the exact amounts to the cylinders and packings. The pistons in the intermediate
sections of the distribution block move back and forth in a continuous cycle, forcing lubricant
successively through the several outlets as long as lubricant is supplied under pressure at the
inlet. Each outlet has a check valve to prevent oil from backing up in the block. An indicator
