F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-7
phosphorous based chemicals that bond with the iron and creates a material that has a low
melting point. When the components contact each other, the new material easily breaks
away to reduce wear.
The reaction of forming the new material takes place at very high local temperatures. These
high temperatures are non existent in the compressor and therefore, the compressor does
not need gear oil. However, it is commonly used in instances where a high viscosity oil is
required such as ISO 460 or ISO 680.
If gear oil is used in the frame, it will be necessary to be sure the additives are not corrosive
to lead or copper based bearing materials.
FRAME OIL SYSTEM
COMPONENTS
Oil Strainer
An oil strainer, installed upstream of the pump will prevent very large particles and objects
from getting into the pump. Ariel supplies a 30 mesh (595 microns) strainer on all
JGM:N:P:Q:JG:J:A:R:W:H:E:K:T compressors and a 40 mesh (400 microns) strainer on all
JGC:D:U:Z:B:V, KBB:V compressors.
Oil Pump
The oil pump constantly supplies oil to all the journal bearings, bushings and crosshead slid-
ing surfaces. The pump is direct coupled to the crankshaft by a chain and sprocket and is
designed to provide adequate oil flow to the bearings when the compressor is operating at
one-half of maximum rated speed.
The compressor frame driven lube oil pumps maintain oil pressure with a spring loaded reg-
ulating valve within the pump head (some models have a separate pressure regulator). Lube
system pressure can be raised or lowered by adjusting the spring tension on this valve.
Oil Cooler
An oil cooler is required and the packager is responsible for sizing the oil cooler. Ariel can
supply the oil cooler as a purchased separately item. Factors that must be taken into
account while sizing a cooler, are the cooling medium, cooling medium temperature, cooling
medium flow rate, lube oil temperature, and lube oil flow rate. Oil heat rejection data for each
frame is available in the Ariel Electronic Data Book (contact your Packager or Ariel when you
need this information). The Data Book also specifies the required flow rate and temperature
of cooling water necessary to properly cool the oil with Ariel supplied coolers. Insufficient
cooling water flow rate is the primary cause of high oil temperatures.
The cooler should be mounted as close to the compressor as possible, with piping of ade-
quate size to minimize pressure drop of both the lubricating oil and the cooling medium.