Dew Point Verification - Ingersoll Rand HRD Serie Manuel De Instrucciones

DANGER
Do not remove the petcock base from the
shuttle valve.
• Unscrew and remove the petcock wing from the
petcock base on the shuttle valve at the top of
the dryer (see Figure 5).
• Insert a -inch allen wrench through the pet-
3
16
cock base to the set screw.
• Adjust the set screw until the pressure on the
purge gauge corresponds to the desired purge
rate as indicated on the purge flow calibration
graph. Turn the set screw counterclockwise to
increase the
purge flow;
clockwise to de-
crease the purge
flow.
• Remove the allen
wrench.
• Replace the pet-
cock wing.
Model 30
HRD56 21
HRD100 39
HRD160 62
HRD200 78
HRD275 107
HRD350 136
HRD475 185
HRD600 234
HRD800 312
HRD1000 390
HRD1200 468
HRD1450 565
HRD1710 666
HRD2010 783
HRD2250 877
HRD2600 1013
HRD3250 1267
Average Purge Rate
38.5
(% inlet air)
Maximum inlet air pressure, 150 psig. Higher pressures available as an option on some models; consult your local distributor
1
HRD Series (Bulletin 348)
Figure 5
Cutaway of Shuttle Valve
INLET AIRFLOW AT VARIOUS INLET AIR PRESSURES
40 50 60
Average Inlet Airflow (scfm)
26 31 36
48 56 65
76 90 104
95 113 130
131 155 179
167 197 228
227 268 309
286 338 391
382 451 521
477 564 651
572 677 782
691 818 944
815 965 1114
959 1134 1309
1073 1269 1465
1240 1467 1693
1550 1833 2117
31.5 26.6 23.0
Inlet air temperatures higher than 100°F will
reduce the design dew point of the dryer.
The dryer can now be put into service. No further ad-
justments are necessary unless there are changes in op-
erating conditions. Within limits, changes in inlet flow
rate can be compensated for by adjusting the purge ad-
justment valve (repeat Steps 1 through 5 above).

Dew Point Verification

After the dryer has operated for a minimum of five
days, check the dew point of the outlet air with a pres-
sure dew point instrument. Follow the directions for
the instrument used. For extremely low dew points al-
low the probe to dry for up to 24 hours after inserting
it into the airstream. It may take up to two weeks of
dryer operation to stabilize at dew points in the –80°F
to –100°F range.
Use only metallic tubing when checking dew point
since plastics, rubber and similar materials absorb
moisture from the ambient air and give false readings.
Table 3
Inlet Air Pressure (psig)
70 80 90
41 45 50
74 83 91
118 132 146
148 165 183
203 227 251
258 289 319
351 392 434
443 495 548
591 661 730
738 826 913
886 991 1095
1071 1197 1324
1263 1412 1561
1484 1660 1835
1662 1858 2054
1920 2147 2373
2400 2683 2967
20.3 18.2 16.4
CAUTION
1
100 110 125
2
55 60 67
100 109 122
160 174 195
200 217 244
275 299 335
350 381 426
475 516 579
600 652 731
800 870 974
1000 1087 1218
1200 1305 1462
1450 1576 1766
1710 1859 2083
2010 2185 2448
2250 2446 2740
2600 2827 3167
3250 3533 3958
15.0 13.8 12.3
150
79
144
230
287
395
503
682
862
1149
1436
1723
2082
2455
2886
3231
3733
4667
10.4
1-9