070.550-IOM (JUN 2016)
Page 7
NGC GAS ROTARY SCREW COMPRESSOR
INSTALLATION
Installation
DESIGN LIMITS
NGC compressors are designed for operation within the
pressure and temperature limits which are specified by
Johnson Controls-Frick and the Johnson Controls-Frick
selection software “CoolWare
™
.” They are primarily used
for compressing natural gas and most hydrocarbon gasses.
Very small amounts of sour gasses and moisture are
acceptable if in accordance with Johnson Controls-Frick
specifications and approvals. Contact Johnson Controls-
Frick Compressor Engineering for guidelines.
CAUTION
The discharge temperature MUST be kept high enough
to prevent condensation of any moisture in the
compressor and oil separator.
Sour gas applications require special attention to prevent
moisture from condensing in the compressor and oil
separator. Discharge temperature must be maintained at a
minimum of 30 degrees F above the dew point temperature
for the gas mixture being compressed. Oil separators must
be insulated to ensure there are no cold spots that could
cause condensation to occur, leading to subsequent acid
formation. A bypass arrangement is recommended to allow
the compressor to warm up to the design operating
temperature prior to introducing sour gas. A dry gas purge
is recom
mended for standby. Johnson Controls - Frick “NG”
oils are specifically formulated for natural gas applications.
They contain the corrosion inhibitors to promote optimum
compressor life. For additional details about natural gas
applications, contact Johnson Controls - Frick Compressor
Engineering.
General information for all of the models is provided below.
Please see CoolWare to determine the limits for a
specific application.
NGC compressors are primarily designed for direct engine
drive. The NGC 100 – 300 models can be delivered with 4
different gear ratios. The NGC 400 and 450 models are
available with 6 gear ratios. The rotor, gear, and bearing
design limitations must not be exceeded (See CoolWare
™
).
The table below lists some of the design limits. Other design
limits are identical to standard non gear-driven compressors.
Refer to Johnson Controls - Frick Compressor Control Panel
publication 090.040-SD for additional information on
setpoint limits.
CONNECTION TYPES & SPECIFICATIONS
PIPING REQUIREMENTS
As a minimum you must connect to the following locations
in addition to suction and discharge.
SB-2
Inlet Bearings and Balance Piston
SB-3
Compressor oil supply
SM-1
Main oil injection
P
Manifold block pressure
T
Manifold block tank
Oil pump in and out
Other connections are available for instrumentation and
service as shown on your P & I diagram.
The electrical connections for the slide stop and the slide
valve transmitters must be connected to your control
system.
Port location drawings
for reference
can be found on
the following pages. Complete dimensions and access
connections can be found on the outline drawings.
NGC 100/150
DWG# 534E0917
NGC 200
DWG# 534E1158
NGC 250
DWG# 534E1137
NGC 300
DWG# 534E0867
NGC 400
DWG# 534E1164
NGC 450
DWG# 534E1165
If you do not have these drawings, they may be requested
by contacting Johnson Controls - Frick sales.
TABLE 2 - GENERAL SPECIFICATIONS
NGC 100/150
Gear A–D
NGC 200/250
Gear A–D
NGC 300
Gear A–D
NGC 400/450
Gear A-F
Design Working Pressure (PSIG)
400
300
400
Min. Drive Speed (RPM) *
600
Max. Drive Speed (RPM) *
A–C: 2,400
D: 2,000
1,800
A–D: 1,800
E: 1,500; F: 1,400
Maximum Input Power
@
1,800 RPM (BHP)
A: 210
B-D:250
A: 550; B: 700
C–D: 800
A: 600
B–D: 800
1,700 @ 1,200 RPM
Oil pressure above discharge
pressure max.*
50 PSI
Min. Oil pressure below
discharge pressure*
15 PSI
* See CoolWare for additional information
