Bare Shaft Gas Compressor Model Designations - Emerson VILTER VSG Installation, Operation And Service Manual

Section 1 • General Information

Bare Shaft Gas Compressor Model Designations

The compressor bare shaft model designation can be found on the nameplate.
Compressor Model
GVSG - Gear Driven Vilter™ Single Screw
Compressor
VSG - Vilter™ Single Screw Compressor
VSSG - Vilter™ Single Screw Compressor
(Compressor models 291, 341, 451 & 601
- these are 240mm diameter rotors with
counter clockwise rotation)
VRSG - Vilter™ Twin Screw Compressor
Size
CFM - Nominal CFM displace-
ment of the compressor at
3600 rpm
Compressor Type
CIH - Standard Cast Iron Material w/
Discharge Connection Horizontal
CID - Standard Cast Iron Material w/
Discharge Connection Down
STH - Steel Compressor Material w/
Discharge Horizontal
HPH - High Pressure Cast Iron
Option w/Discharge Connection
Horizontal (This currently exists on
only the VSG-1501/1801)
DIH - Ductile Iron(750MAWP) w/
Discharge Connection Horizontal
DID - Ductile Iron Material w/
Discharge Connection Down
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VSG & VSSG Single Screw Compressor • Installation, Operation and Service Manual • Emerson • 35391SB
Drive Shaft Type
STD - Standard Drive shaft
is tapered on all models
except (VSG-301, 361, 401,
2401, 2601, 2801, 3001
STR - Straight Compressor
Shaft for Heavy Duty
SDS - Severe Duty Larger
Diameter Straight Shaft
VSG –1801–HPH–STR–LS–V–SS
Slide Design Type
SD - Standard Slide Assembly
LS - Landfill Service Slide (Slide with
increased clearance,no piston ring)
LR - Low Ratio Slide (Additional Porting
for below Compression Ratios of 2.5)
HR - Standard Slide (Balance Grooves
for High Differentials above 325 PSID)
FR - Fixed Ratio Single Slide
HD - 4340 Material
RS - Reinforced Shaft Rack
FV - Fixed Volume
HPLD compressor - No slide.
205mm LITE compressor - Use alpha-
bet of slide number used in compres-
sor BOM.
Seal Type
V - Viton O-rings
AF - Aflas O-rings
TV - Tandem Seal w/Viton
O-rings
HV - High Pressure Design
w/ Viton O-rings
AHF - Ammonia Service
High Pressure Aflas O-ring
Special Designations
SS - Stainless Steel Internal
Hardware
C - Ceramic Bearings
x.xR - Gear Ratio of x.x (Internal
Gear Drive Example: 2.0R - Gear
Ratio of 2.0)
MV - Manual Volume slide
MCV - Manual Capacity and
Volume slide
EO - External Oil Feed
VIB - Main Housing with Vibration
Mounting
B - Balanced Main Rotor
BL - Balance Loading
PPS - Ryton Slide Clamp
PPC - Carbon Slide Clamp
N - 900# Flange
AF - Aflas O-rings
LT - 205mm LITE compressor