TM 55-1925-286-13&P
0002 00
EQUIPMENT DATA
AIR COMPRESSORS
Two 2-stage air compressors supply all of the compressed air needs of the Inland and Coastal Large Tug (LT).
The compressors are permanently mounted on the port side of Auxiliary Machinery Space 1 (AMS 1). Compres-
sor 1 is the uppermost compressor, while compressor 2 is the lowest unit.
Each compressor is driven by its own electric motor via a V-belt. These motors are controlled by motor control-
lers mounted in the vicinity of the air compressors. Maintenance of the motor controllers is contained in TM 55-
1925-273-24&P.
Technical characteristics of the compressors are contained in table 1.
Table 1. Air Compressor Technical Characteristics
Item
Data
Manufacturer ............................................................................................................................... Quincy
Series ........................................................................................................................................... QR-25
Model ............................................................................................................................................... 340
Type ........................................................................................................................................... 2 Stage
Stroke ......................................................................................................................... 3.50 in (88.9 mm)
Bore, Low Pressure ................................................................................................ 5.25 in (133.35 mm)
Bore, High Side .......................................................................................................... 3.00 in (76.2 mm)
Speed Range (r/min) ................................................................................................................. 400-900
Maximum Pressure (continuous) .............................................................................. 200 PSI (13.8 bar)
Maximum Pressure (intermittent) .............................................................................. 500 PSI (34.5 bar)
Cooling ............................................................................................................................................... Air
RECEIVERS
Two receivers, located inboard and forward of the air compressors, store the air for the starting air system. These
receivers also supply air to the ship's service air receiver, located just aft of the starting air receivers. Technical
characteristics of the receivers are contained in table 2.
Table 2. Receiver Technical Characteristics
Item
Data
Starting Air Receivers
Quantity ......................................................................................................................................... 2
Capacity ............................................................................................. 400 gallons (1514 liters) each
Working Pressure ............................................................................................... 250 PSI (17.2 bar)
Relief Pressure ................................................................................................... 275 PSI (19.0 bar)
Design Temperature .................................................................................................. 150 F (66 C)
Ship's Service Air Receivers
Quantity ......................................................................................................................................... 1
Capacity ....................................................................................................... 200 gallons (757 liters)
Working Pressure ................................................................................................. 125 PSI (8.6 bar)
Relief Pressure .................................................................................................. 137.5 PSI (9.5 bar)
Design Temperature .................................................................................................. 150 F (66 C)
0002 00-3
