Cooling And Lubricating Oil System - Atlas Copco PTS 916 Cd Instruction Manual

PTS 916 Cd

2.7 Cooling and lubricating oil system

Oil from the oil sump (OS) of gear casing (GC) is circulated by an
oil pump (OP), mounted on the front of the gear casing. The pump
is driven from the main drive shaft. The oil is pumped to the cooling
jacket of the MP compressor element (CE
jacket of the LP compressor element (CE
through the air-cooled oil cooler (OC). From the LP element
cooling jacket the oil passes through oil filter (OF
before entering the LP and MP element oil pipes and ducts to
lubricate the rotor bearings, driving and timing gears. The oil then
flows back to the oil sump.
The gear casing is vented to the atmosphere through a breather pot
assembly.
The bypass valve (BV ) of the oil filter opens when the pressure
OF
drop over the filter is above normal due to clogging of the element.
COOLING CIRCUIT
BV Bypass valve (oil cooler)
OC
BV Bypass valve (oil filter)
OF
BV Bypass valve (oil sump)
OS
CE LP compressor element
LP
CE MP compressor element
MP
DP Drain plug (oil cooler)
OC
DP Drain plug (oil sump)
OS
F Cooling fan 1 (RAD, IC, AC
1
18
) and to the cooling
MP
) and from there
LP
) on gear casing
C
OG
LP
CE
CE
LP
GC
DP OS
OS
CE
CE
LP
OF
C
GC
OS
DP
OS
BV
OP
OS
BV
OC
, OC)
1
The oil is then circulated without being filtered. For this reason, it
is imperative to replace the oil filter at regular intervals.
Bypass valve (BV
and lubricating circuit is above normal. The oil is then returned to
the oil sump.
Bypass valve (BV
cooler is above normal. This will happen mainly when starting the
compressor from cold in low ambient temperatures. The bypassing
of the oil cooler will ensure rapid warming of the oil to the normal
working temperature.
A pressure shutdown sensor and a temperature reading sensor (TS)
are comprised in the system.
LUBRICATING
CIRCUIT
MP
OG
MP
MP
OC
BV
OF
t TS
GC Gear casing
OC Oil cooler
OF Compressor oil filter (with bypass valve)
C
OG Oil gallery (LP compressor element)
LP
OG Oil gallery (MP compressor element)
MP
OP Oil pump
OS Oil sump
TS Temperature sensor
) opens when the pressure drop over the filter
OS
) opens when the pressure rise over the oil
OC
F 1
DP
OC
Preliminary