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Specifications, Purge Curves and Replacement Parts for -100°F Pressure Dew Doint Dryers C - 5
HYDROBLOC LSC
PURGE CURVES
Calculation of Purge Pressure Setting
6. Locate the Purge Adjusting Valve. Slowly rotate
dryer’s Purge Adjusting Valve until the Purge Pres-
sure Indicator indicates the calculated purge pres-
sure setting. (See following Note).
Note: The purge pressure can only be read and ad-
justed when an off-line desiccant chamber has de-
pressurized for regeneration. (When the off-line
chamber is pressurized, the Purge Pressure Indica-
tor will read “system pressure”.)
1. Determine air pressure (psig) at the dryer inlet.
2. Refer to Table C-1. Determine the inlet airflow for your
model and inlet air pressure.
3. To calculate purge flow consumption on the critical
orifice curve:
Inlet Flow (SCFM) × 14.7 PSIG
× 1.15 = Purge (SCFM)
Inlet Pressure (PSIG) + 14.7 PSIG
4. Locate the Critical Orifice Calibration Curve that has
been sized for your specific dryer model.
5. Cross the Purge Flow requirement calculated above
to the same number on the Critical Orifice Calibra-
tion Curve. Follow this line vertically and then hori-
zontally once intersection is made with the curve line
to find the actual purge pressure setting.
¹ Maximum inlet air pressure, 150 psig.
² Based on 100°F inlet air temperature and -100°F pressure dew point. Maximum recommended inlet temperature, 120°F. For capacity at inlet
temperature higher than 100°F, consult your local distributor.
Table C - 1 Inlet Airflow at Various Inlet Air Pressures¹
Inlet Air Pressure (psig)
Model 60 70 80 90 100 110 120 130 140 150
Average Inlet Airflow (scfm)²
LSC60 23 27 30 33 36 39 42 45 49 52
LSC110 43 49 54 60 66 72 78 83 89 95
LSC130 51 58 64 71 78 85 92 98 105 112
LSC185 72 82 92 101 111 121 130 140 150 159
LSC240 94 106 119 131 144 157 169 182 194 207
LSC270 106 120 134 148 162 176 190 204 218 233
LSC360 141 160 178 197 216 235 254 272 291 310
LSC505 197 224 250 277 303 329 356 382 409 435
LSC630 246 279 312 345 378 411 444 477 510 543
LSC760 297 337 376 416 456 496 536 575 615 655
LSC1000 391 443 495 548 600 652 705 757 809 862
LSC1250 488 554 619 685 750 815 881 946 1,012 1,077
LSC1500 586 665 743 822 900 978 1,057 1,135 1,214 1,292
LSC2070 809 917 1,025 1,134 1,242 1,350 1,459 1,567 1,675 1,783
LSC2580 1,008 1,143 1,278 1,413 1,548 1,683 1,818 1,953 2,088 2,223