
Section 3
ST18 & ST22 (U.S.A. & Mexico) Operation & Maintenance Manual
3: Specifications
88291013-137 R05
Subject to EAR, ECCN EAR99 and related export control restrictions.
17
Specifications
3.1
Machine specifications
3.2
Lubricant specifications
The oil used as a lubricant in Sullair’s rotary screw com-
pressors must have the following properties:
• Low foaming
• Good resistance to emulsification
• High oxidation resistance
• Viscosity of 10.5 cSt at the compressor’s oper-
ating temperature
Table 3-1: Compressor specifications
Model
ST18
ST22
Capacity at full load pressure
2.8 m
3
/min (100 cfm)
3.6 m
3
/min (127 cfm)
Rated pressure
8.0 bar (115 psi)
8.0 bar (115 psi)
Maximum working pressure
8.6 bar (125 psi)
8.6 bar (125 psi)
Relief valve setpoint
10 bar (145 psi)
10 bar (145 psi)
Voltage & frequency
460/230V 60Hz or 460V 60 Hz
Air end type
Single stage, oil injected rotary screw
Configuration
Gear driven with integrated inlet modulation
Motor type
ODP (IP23)
Motor rating
18.5 kW (25 hp)
22 kW (30 hp)
Motor nominal speed
1770 rpm
Starting mode
Y-
∆
(Y-delta)
Service factor
1.15
Ambient temperature
Between 4° and 40°C (40° and 104°F)
Lubricant
Sullube
®
Lubricant volume
11 L (3 gal)
Service connector
NPT 1
″
Moisture drain connector
NPT
⅛″
(moisture separator shipped loose)
Machine weight
660 kg (1455 lbs)
662 kg (1460 lbs)
Machine dimensions (L × W × H)
1340 × 740 × 1300 mm (52.8 × 29.1 × 51.2 in)
Package dimensions (L × W × H)
1460 × 910 × 1535 mm (57.5 × 35.8 × 60.4 in)
Table 3-2: Lubricant specifications
Synthetic oils
Ambient temperature
Sullube
®
(factory fill)
Up to 40°C (104°F)
WARRANTY INFORMATION
Mixing of fluids other than Sullube
®
will
void the
compressor’s warranty.