Steam traps Inverted bucket
8
Capacities (in accordance with ISO 7842)
Differential pressure psi (x 100 = kPa)
1
3 4
7
14
29 43 58 72 145
304
4409
Cold water Hot water
2204
1102 881 661 441
220
110 88 66 44
Differential pressure bar (x 100 = kPa)
Dimensions/weights (approximate) in mm (inches) and kg (lbs)
D
A
Model
A B C D
Weight (Trap only)
USM21
35 (1.38)
78 (3.07)
68 (2.68)
40 (1.57)
0.6 (1.32)
C
B
How to specify Steam traps shall be of the sealed bimetal thermostatic USM21 type manufactured in stainless steel and be suitable for operating pressures up to 21 bar 305 psi. Traps to be zero maintenance and to be connected to separate pipeline connectors by two screws for quick and simple installation/replacement. The thermostatic element is to nominally operate at 10 °C, 30 °C, 50 °C or 70 °C (50 °F, 86 °F, 122 °F or 158 °F) below steam temperature. Traps can be installed in any plane. How to order The USM21 is supplied in two parts:-
8.6 24
PC10HP Standard connection PC20 + 'Y' type strainer IPC2 _
1. The swivel pipeline connector
+ 'Y' type strainer and Spiratec sensor
PC3 _ PC4 _
+ 1 integral ISO valve
+ 2 integral ISO valves 2. The USM21 trap complete with inner and outer gaskets and two connector screws.
Notes: 1. State the nominal subcooling temperature required. 2. Any optional extras need to be specified at the time of order placement.
How to order example: 1 off ½" PC10HP swivel connector having screwed NPT connections for use with a USM21 sealed bimetallic steam trap. 1 off Spirax Sarco USM21 sealed bimetallic steam trap, set to operate nominally at 30 °C (86 °F) below steam temperature.
TI-P625-04 CMGT Issue 4
Page 4 of 5
USM21 Sealed Bimetallic Steam Trap for use with Pipeline Connectors
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