STEAM TRAPS Introduction Steam Trap Selection Guidelines • DRIP Applications
Sizing Example: Size a drip trap for an 8” steam main with 100 psig steam pressure. Traps should be placed every 200 ft. A 2x safety factor based on Warm-Up load will be used. • Based on Warm-Up Load Chart: 100 lbs/hr of condensate is generated per 100 feet length of pipe. • Warm up load for 200 ft. length is therefore, 200 lbs/hr (2 x 100 lbs/hr) • If a 2x safety factor based on warm-up load is used, we require a trap with a capacity of 400 lbs/hr
• Actual running load for 100 ft. length = 41 lbs/hr • Actual running load for 200 ft. length = 82 lbs/hr
Warm-Up Loads in Pounds of Condensate per hour per 100 ft. of Steam Main
Outside Temperature at 70˚F
0˚F Correction Factor †
Pipe Size
Steam Pressure (PSIG)
2” 2 1 / 2 ” 3” 4”
5”
6”
8”
10” 12”
14” 16” 18”
20” 24”
8.4
13.4 17.5 20.3 21.7
17.5 22.9 26.6 28.4
24.9 32.6 37.8
33.8
44 57 67 71
66 86
93
124 162 188 200
146 192 222 238
191 250 290 310
241 316 366 391
284 372 431 461
396 518 600 642
1.37 1.29 1.26 1.25
20 60
11.0 12.8 13.7
44 51 55
122 142 152
100 107
100 125
40
Running Loads in Pounds of Condensate per hour per 100 ft. of Steam Main
Outside Temperature at 70˚F
Steam Pressure (PSIG)
0˚F Correction Factor†
Pipe Size
2” 2 1 / 2 ” 3” 4”
5”
6”
8”
10” 12”
14” 16” 18”
20” 24”
8
9
11 14 18 20
14 18 22 24
17 24 28 30
20 27 33 36
26 33 41 45
32 41 51 56
38 49 61 66
42 54 67 73
48 62 77 84
51 67 83 90
57 74 93
68 89
1.50 1.45 1.41 1.39
20 60
10 12 13
12 15 16
111 121
100 125
101
† For outdoor temperatures of 0˚F, multiply load value selected from table by correction factor shown.
Trap Selection: Reference the TD600S Series Capacity Chart below based on inlet steam pressure. Enter the chart under 100 psig inlet pressure to compare the capacities of different models. The 1/2” TD600LS will be capable of discharging 375 lbs/hr of condensate at 100 psig steam pressure. The capacity is slightly less than the load calculated based on warm-up load with 2x safety factor, however, this trap selection would be a suitable choice since its capacity is well in excess of what is actually required. These loads are indicative of drip applications and lend support as to why only reduced capacity 1/2" TD600L or 3/4" TD600L traps are required for the majority of drip applications.
CAPACITIES – Condensate (lbs/hr)
Inlet Pressure (Steam)
Steam Inlet Pressure (PSIG)
Size Model Code
3.5
5
10 15 20 25
30
40 50
75 100
1/2” TD600LS-12-N 1” TD600LS-14-N 3/4” TD600LS-13-N 1/2” TD600S-12-N 3/4” TD600S-13-N
180 185
190 195 200 215 220 230 250 310 375
300 315
350 380 415 440 470 515 580 710 825
100
300 315 415 430
350 380 415 440 470 515 580 710 825 475 520 565 610 650 720 825 1020 1185
Steam Pressure pushes condensate through trap
2 8
Tel: 610-495-5131 • Pottstown PA • USA •• www.watsonmcdaniel.com
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