Hauck OMG SERIES User manual

ORIFICE METERS
TABLE OF CONTENTS
Subject Page
A. General Information..............................................................................................…… 2
B. Receiving and Inspection.....................................................................................…… 2
C. Installation..............................................................................................................….. 3
D. Manometer Adjustment...........................................................................................…. 3
E. Operation................................................................................................................…. 3
F. Maintenance............................................................................................................…. 4
Attached: Hauck Orifice Meter Capacity Charts
INSTRUCTIONS
WARNING
These instructions are intended for use only by experienced, qualified
combustion start-up personnel.
Adjustment of this equipme
nt and its components, by unqualified personnel,
can result in fire, explosion, severe personal injury, or even death.
OMG-9
These instructions are intended to serve as guidelines covering the installation, operation, and maintenance of Hauck equipment. While
every attempt has been made to ensure completeness, unforeseen or unspecified applications, details, and variations may preclude
covering every possible contingency. WARNING: TO PREVENT THE POSSIBILITY OF SERIOUS BODILY INJURY, DO NOT USE OR
OPERATE ANY EQUIPMENT OR COMPONENT WITH ANY PARTS REMOVED OR ANY PARTS NOT APPROVED BY THE
MANUFACTURER. Should further information be required or desired or should particular problems arise which are not covered
sufficiently for the purchaser's purpose, contact Hauck Mfg. Co.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
3/99 www.hauckburner.com Fax: [phone]

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OMG-9
A. GENERAL INFORMATION
The Hauck Orifice Metering System is a family of assemblies of threaded or welded design used for
measuring the flow of either combustion air or any industrial gas. These meters may be used in the
main gas and air lines or in the gas and air lines of individual burners. The former configuration
allows the monitoring of total flow while the latter method allows precise setting of each burner.
B. RECEIVING AND INSPECTION
Upon receipt, check each item on the bill of lading/and or invoice to determine that all equipment has
been received. A careful examination of all parts should be made to ascertain if there has been any
damage in shipment.
C. INSTALLATION
1. Install the orifice meter in any position in the appropriate line. Most orifice meters are available
in either of two configurations: one designed specifically for a welded connection, the other for
a threaded female connection. The location chosen for installation should permit easy access
to both pressure cocks and allow sufficient space to remove the orifice plate, if required.
When used in the gas and air lines of individual burners, mount the orifice meter between a
flow control valve and the burner.
2. Insert and loosely tighten the three (3) connecting bolts not required to hold the orifice plate
in position.
3. Insert the orifice plate and secure it in place by insertion of the fourth connecting bolt.
NOTE
For maximum accuracy provide 10 pipe diameters
of straight piping without fittings immediately
preceding the orifice meter and 5 pipe diameters
downstream of the orifice.
IMPORTANT
If the installation is delayed and the equipment is
stored outside, provide adequate protection as
dictated by climate and period of exposure.
Special care should be given to all motors and
bearings, if applicable
, to protect them from rain or
excessive moisture.

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OMG-9
4. Firmly tighten all bolts.
5. Insert a threaded plug in the unused cock openings.
D. MANOMETER ADJUSTMENT
1. Place the manometer on a rigid support.
2. Insert the proper amount of fluid into the manometer and adjust the fluid height until a 0.0"
manometer reading is obtained.
3. Connect the orifice meter pressure cocks to the manometer, using EQUAL lengths of vinyl tub-
ing, such as Tygon, or equivalent.
E. OPERATION
The orifice metering system is designed so that the specific water column (wc) differential observed
on the manometer corresponds to a specific flow rate through the orifice (for the specific plate being
used).
1. Fully open the orifice meter pressure cocks.

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OMG-9
2. Read the water column differential in inches and tenths of an inch. If the reading differs from
the desired reading, adjust the flow control valve until the manometer coincides with the de-
sired reading.
3. Fully close the orifice meter pressure cocks (and tubing clips if applicable).
4. Disconnect the connecting tubing, if desired.
F. MAINTENANCE
The design of the orifice plate and brackets requires no service or maintenance.
If it ever becomes necessary to change the orifice plate:
1. Loosen all four (4) connecting bolts.
2. Completely remove the plate positioning bolt.
3. Remove the old plate and insert the new one.
4. Securely tighten all connecting bolts.
Periodically check the quantity of fluid in the manometer and refill as required.
NOTE
To reduce the risk of "blowing" the manometer
(forcing the fluid out of the manometer into the
tubing) tubing clips or valves can be located in
the vinyl tubing lines near the manometer.
The
clips or valves are first closed and then
the orifice meter cocks are opened. The clips
or valves are then opened. Locating the
shutoff near the manometer minimizes the
gas volume being compressed when the
opposite leg of the manometer is opened to
system pressure.
Reducing this volume limits movement of fluid
in the manometer.

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OMG-9
OMG SERIES ORIFICE METERS
AIR & NATURAL GAS FLOW CAPACITY (SCFH)
100 – 200 Series Threaded / Weld-In
3/8" Through 1 ½" Pipe Size
Air Natural Gas
Pipe
Size
OMG
Model
Number
Orifice
Bore
Size
0.5"
w.c.Δ
P
1"
w.c.Δ
P
3"
w.c.ΔP
5"
w.c.ΔP
0.5"
w.c.ΔP
1"
w.c.Δ
P
3"
w.c.ΔP
5"
w.c.ΔP
0.197 24 33 57 73 30 43 73 94
0.232 33 46 80 103 42 60 103 132
0.266 44 62 107 137 57 80 137 177
0.307 61 85 147 189 78 110 189 244
3/8" 103
0.350 84
118 203 261 108 152 262 336
0.232 32 45 78 100 41 58 100 129
0.266 42 60 103 133 55 77 133 171
0.317 61 86 149 191 79 111 192 247
0.368 85 120 206 265 109 154 266 342
1/2" 105
0.423 118
166 286 368 152 214 369 475
0.273 44 62 107 137 57 80 137 177
0.324 62 87 151 194 80 113 194 250
0.379 86 121 208 268 110 156 269 346
0.437 116 163 282 363 149 211 363 468
0.508 162 228 394 507 208 294 508 654
3/4" 107/207
0.585 221
322 555 714 294 415 716 921
0.324 61 86 149 192 79 111 192 247
0.384 86 122 210 270 111 157 271 349
0.452 120 170 293 378 155 219 378 487
0.523 163 230 398 513 211 297 513 661
0.613 231 326 562 724 297 420 725 935
1" 110/210
0.715 331
467 806 1039 427 602 1040 1340
0.456 120 170 294 379 155 219 379 488
0.533 165 233 403 520 213 301 520 671
0.630 233 330 570 734 301 425 735 947
0.735 324 457 790 1018 418 590 1020 1314
0.850 447 632 1092 1407 577 815 1409 1816
1 ¼" 112/212
0.986 641
905 1564 2015 827 1168 2018 2600
0.533 164 232 400 516 212 299 517 666
0.635 234 331 572 737 302 427 738 951
0.744 325 459 794 1023 419 593 1024 1320
0.867 450 636 1100 1417 581 821 1419 1829
1.005 626 885 1530 1972 808 1142 1974 2544
1 ½" 115/215
1.156 881
1245 2151 2771 1137 1607 2776 3576
Notes:
1. Orifice Bore Size Equals The Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Equals Schedule 40 Pipe.
2. Capacity Based On 60°F @ 1 psig Upstream Pressure. Natural Gas Specific Gravity At 0.60; Air Specific Gravity At 1.0.
3. 1__ Model Number Designates NPT Threaded Connection. 2__ Model Number Designates Weld-In Connection.
4. All Flow Rates At Standard Barometric Pressure: 29.92" Hg (Sea Level).
5. Design Capacity Is Based On 3" W.C.ΔP.
Continued
9/98

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OMG-9
OMG SERIES ORIFICE METERS
AIR & NATURAL GAS FLOW CAPACITY (SCFH)
100 – 200 Series Threaded / Weld-In
2" Through 6" Pipe Size
Air Natural Gas
Pipe
Size
OMG
Model
Number
Orifice
Bore
Size
0.5"
w.c.Δ
P
1"
w.c.Δ
P
3"
w.c.ΔP
5"
w.c.ΔP
0.5"
w.c.ΔP
1"
w.c.Δ
P
3"
w.c.ΔP
5"
w.c.Δ
P
0.640 238 335 577 743 307 432 744 958
0.754 334 470 808 1039 430 605 1041 1339
0.875 455 640 1100 1415 586 824 1417 1823
1.034 650 914 1568 2016 836 1175 2019 2597
1.203 911 1278 2192 2817 1170 1644 2822 3629
2" 120/220
1.375 1250
1753 3003 3858 1605 2253 3865 4967
0.754 330 465 800 1030 425 599 1031 1328
0.890 464 652 1123 1445 597 840 1447 1863
1.048 651 916 1576 2027 838 1180 2030 2613
1.236 926 1302 2237 2877 1191 1676 2881 3707
1.423 1266 1778 3053 3925 1628 2288 3932 5056
2 ½" 125/225
1.625 1730
2428 4164 5353 2223 3123 5362 6894
0.894 462 651 1122 1444 595 839 1446 1863
1.056 649 914 1575 2027 836 1178 2030 2614
1.252 923 1300 2237 2879 1188 1674 2884 3712
1.452 1262 1776 3056 3932 1625 2287 2938 5068
1.688 1753 2466 4238 5452 2256 3174 5460 7026
3" 130/230
1.963 2483
3489 5993 7706 3193 4491 7719 9929
1.261 919 1295 2234 2877 1184 1670 2881 3710
1.470 1258 1773 3056 3935 1621 2285 3941 5075
1.722 1748 2462 4242 5461 2251 3173 5468 7041
2.029 2479 3491 6009 7734 3192 4497 7746 9971
2.345 3418 4810 8275 10648 4400 6195 10665 13725
4" 140/240
2.691 4731
6655 11440 14716 6088 8568 14741 18966
1.735 1729 2439 4211 5425 2229 3146 5432 6998
2.067 2470 3484 6011 7743 3184 4493 7754 9988
2.437 3468 4890 8434 10863 4469 6305 10878 14011
2.879 4924 6941 11965 15408 6344 8947 15429 19870
3.314 6685 9420 16231 20897 8611 12140 20928 26946
3.850 9423 13272 22856 29419 12135 17101 29466 37931
6" 160/260
4.388 13055
18381 31638 40712 16809 23679 40781 52484
Notes:
6. Orifice Bore Size Equals The Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Equals Schedule 40 Pipe.
7. Capacity Based On 60°F @ 1 psig Upstream Pressure. Natural Gas Specific Gravity At 0.60; Air Specific Gravity At 1.0.
8. 1__ Model Number Designates NPT Threaded Connection. 2__ Model Number Designates Weld-In Connection.
9. All Flow Rates At Standard Barometric Pressure: 29.92" Hg (Sea Level).
10. Design Capacity Is Based On 3" W.C.ΔP.