Series OP Orifice Plate Flowmeter

Stainless Steel for Use with Compatible Liquids and Gases

The Series OP Orifice Plate Flowmeter is a complete orifice plate flow metering package. It incorporates a stainless steel orifice plate with a unique holder or carrier ring containing metering taps and integral gaskets. It was designed for use wherever there is an application for a conventional flow orifice plate. It can also be used in place of other primary differential producers for efficiency and cost effectiveness. Installation is accomplished simply by slipping the unit between standard flanges (orifice flanges are not required). The Series OP is available in line sizes from 1/2" to 24" and can be used with compatible liquids and gases.

Product Applications

Fluid flow rates in building water lines
Boiler feedwater
Cooling water
Combustion or compressed air
Steam flow

Starting at $473.00

Ordering

Grouped product items
Model	Description	Availability*	Price
OP-A-3	Orifice plate flowmeter, 0.5" line size, 0.430" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 13.00 GPM flow; air capacity: 200" d.p. W/C, 32.77 SCFM @ 14.7 psia, 56.15 SCFM @ 20 psig, 107.47 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00
OP-B-1	Orifice plate flowmeter, 0.75" line size, 0.250" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 0.97 GPM flow; air capacity: 20" d.p. W/C, 3.65 SCFM @ 14.7 psia, 5.66 SCFM @ 20 psig, 10.3 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00
OP-B-2	Orifice plate flowmeter, 0.75" line size, 0.400" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 5.69 GPM flow; air capacity: 100" d.p. W/C, 20.21 SCFM @ 14.7 psia, 32.44 SCFM @ 20 psig, 60.26 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00
OP-B-3	Orifice plate flowmeter, 0.75" line size, 0.580" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 23.82 GPM flow; air capacity: 200" d.p. W/C, 59.92 SCFM @ 14.7 psia, 102.91 SCFM @ 20 psig, 197.2 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00
OP-C-1	Orifice plate flowmeter, 1" line size, 0.300" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 1.38 GPM flow; air capacity: 20" d.p. W/C, 5.24 SCFM @ 14.7 psia, 8.11 SCFM @ 20 psig, 14.8 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-C-2	Orifice plate flowmeter, 1" line size, 0.520" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 9.63 GPM flow; air capacity: 100" d.p. W/C, 34.2 SCFM @ 14.7 psia, 54.92 SCFM @ 20 psig, 102.09 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-C-3	Orifice plate flowmeter, 1" line size, 0.720" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 36.15 GPM flow; air capacity: 200" d.p. W/C, 91.28 SCFM @ 14.7 psia, 156.51 SCFM @ 20 psig, 300 SCFM @ 100 psig; 2 lb.	6-7 Weeks*	$473.00
OP-D-1	Orifice plate flowmeter, 1.25" line size, 0.400" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 2.46 GPM flow; air capacity: 20" d.p. W/C, 9.31 SCFM @ 14.7 psia, 14.41 SCFM @ 20 psig, 26.3 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-D-2	Orifice plate flowmeter, 1.25" line size, 0.700" bore, 0.51 Beta, water capacity: 100" d.p. W/C, 17.48 GPM flow; air capacity: 100" d.p. W/C, 62.09 SCFM @ 14.7 psia, 99.75 SCFM @ 20 psig, 185.5 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-D-3	Orifice plate flowmeter, 1.25" line size, 1.00" bore, 0.72 Beta, water capacity: 320" d.p. W/C, 71.77 GPM flow; air capacity: 200" d.p. W/C, 180 SCFM @ 14.7 psia, 309.97 SCFM @ 20 psig, 595.2 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-E-1	Orifice plate flowmeter, 1.5" line size, 0.500" bore, 0.31 Beta, water capacity: 20" d.p. W/C, 3.85 GPM flow; air capacity: 20" d.p. W/C, 14.57 SCFM @ 14.7 psia, 22.55 SCFM @ 20 psig, 41.16 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-E-2	Orifice plate flowmeter, 1.5" line size, 0.800" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 22.73 GPM flow; air capacity: 100" d.p. W/C, 80.82 SCFM @ 14.7 psia, 129.68 SCFM @ 20 psig, 251.5 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-E-3	Orifice plate flowmeter, 1.5" line size, 1.100" bore, 0.68 Beta, water capacity: 320" d.p. W/C, 83.95 GPM flow; air capacity: 200" d.p. W/C, 212.18 SCFM @ 14.7 psia, 363.93 SCFM @ 20 psig, 697.39 SCFM @ 100 psig; 2 lb.	4-5 Weeks*	$473.00
OP-F-1	Orifice plate flowmeter, 2" line size, 0.600" bore, 0.29 Beta, water capacity: 20" d.p. W/C, 5.52 GPM flow; air capacity: 20" d.p. W/C, 20.92 SCFM @ 14.7 psia, 32.38 SCFM @ 20 psig, 59.13 SCFM @ 100 psig; 3 lb.	4-5 Weeks*	$532.00
OP-F-2	Orifice plate flowmeter, 2" line size, 1.000" bore, 0.48 Beta, water capacity: 100" d.p. W/C, 35.34 GPM flow; air capacity: 100" d.p. W/C, 125.74 SCFM @ 14.7 psia, 202.03 SCFM @ 20 psig, 375.8 SCFM @ 100 psig; 3 lb.	4-5 Weeks*	$532.00
OP-F-3	Orifice plate flowmeter, 2" line size, 1.450" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 147.74 GPM flow; air capacity: 200" d.p. W/C, 372.09 SCFM @ 14.7 psia, 639.87 SCFM @ 20 psig, 1227.63 SCFM @ 100 psig; 3 lb.	4-5 Weeks*	$532.00
OP-G-1	Orifice plate flowmeter, 2.5" line size, 0.750" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 8.63 GPM flow; air capacity: 20" d.p. W/C, 32.71 SCFM @ 14.7 psia, 50.64 SCFM @ 20 psig, 92.48 SCFM @ 100 psig; 4 lb.	4-5 Weeks*	$580.65
OP-G-2	Orifice plate flowmeter, 2.5" line size, 1.250" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 55.54 GPM flow; air capacity: 100" d.p. W/C, 197.54 SCFM @ 14.7 psia, 317.58 SCFM @ 20 psig, 590.91 SCFM @ 100 psig; 4 lb.	4-5 Weeks*	$580.65
OP-G-3	Orifice plate flowmeter, 2.5" line size, 1.750" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 216.30 GPM flow; air capacity: 200" d.p. W/C, 543.99 SCFM @ 14.7 psia, 936.56 SCFM @ 20 psig, 1798.86 SCFM @ 100 psig; 4 lb.	7-8 Weeks*	$580.65
OP-H-1	Orifice plate flowmeter, 3" line size, 0.920" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 12.97 GPM flow; air capacity: 20" d.p. W/C, 49.17 SCFM @ 14.7 psia, 78.13 SCFM @ 20 psig, 139.06 SCFM @ 100 psig; 5 lb.	4-5 Weeks*	$639.65
OP-H-2	Orifice plate flowmeter, 3" line size, 1.500" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 79.94 GPM flow; air capacity: 100" d.p. W/C, 282.9 SCFM @ 14.7 psia, 454.77 SCFM @ 20 psig, 846.21 SCFM @ 100 psig; 5 lb.	4-5 Weeks*	$639.65
OP-H-3	Orifice plate flowmeter, 3" line size, 2.150" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 324.16 GPM flow; air capacity: 200" d.p. W/C, 816.7 SCFM @ 14.7 psia, 1404.95 SCFM @ 20 psig, 2696.28 SCFM @ 100 psig; 5 lb.	8-9 Weeks*	$639.65
OP-J-1	Orifice plate flowmeter, 4" line size, 1.200" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 22.03 GPM flow; air capacity: 20" d.p. W/C, 83.58 SCFM @ 14.7 psia, 129.44 SCFM @ 20 psig, 236.48 SCFM @ 100 psig; 7 lb.	4-5 Weeks*	$857.00
OP-J-2	Orifice plate flowmeter, 4" line size, 2.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 141.51 GPM flow; air capacity: 100" d.p. W/C, 503.76 SCFM @ 14.7 psia, 810.06 SCFM @ 20 psig, 1507.64 SCFM @ 100 psig; 7 lb.	4-5 Weeks*	$857.00
OP-J-3	Orifice plate flowmeter, 4" line size, 2.800" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 547.11 GPM flow; air capacity: 200" d.p. W/C, 1380.03 SCFM @ 14.7 psia, 2373.02 SCFM @ 20 psig, 4553.68 SCFM @ 100 psig; 7 lb.	6-7 Weeks*	$857.00
OP-K-1	Orifice plate flowmeter, 5" line size, 1.500" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 34.39 GPM flow; air capacity: 20" d.p. W/C, 130.48 SCFM @ 14.7 psia, 202.11 SCFM @ 20 psig, 369.29 SCFM @ 100 psig; 8 lb.	4-5 Weeks*	$1,028.80
OP-K-2	Orifice plate flowmeter, 5" line size, 2.500" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 220.80 GPM flow; air capacity: 100" d.p. W/C, 786.23 SCFM @ 14.7 psia, 1264.42 SCFM @ 20 psig, 2353.51 SCFM @ 100 psig; 8 lb.	4-5 Weeks*	$1,028.80
OP-K-3	Orifice plate flowmeter, 5" line size, 3.500" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 853.09 GPM flow; air capacity: 200" d.p. W/C, 2152.83 SCFM @ 14.7 psia, 3701.57 SCFM @ 20 psig, 7103.22 SCFM @ 100 psig; 8 lb.	4-5 Weeks*	$1,028.80
OP-L-1	Orifice plate flowmeter, 6" line size, 1.800" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 49.46 GPM flow; air capacity: 20" d.p. W/C, 187.86 SCFM @ 14.7 psia, 291 SCFM @ 20 psig, 531.75 SCFM @ 100 psig; 10 lb.	4-5 Weeks*	$1,157.15
OP-L-2	Orifice plate flowmeter, 6" line size, 3.000" bore, 0.49 Beta, water capacity: 100" d.p. W/C, 317.74 GPM flow; air capacity: 100" d.p. W/C, 1331.63 SCFM @ 14.7 psia, 1820.05 SCFM @ 20 psig, 3387.93 SCFM @ 100 psig; 10 lb.	6-7 Weeks*	$1,157.15
OP-L-3	Orifice plate flowmeter, 6" line size, 4.200" bore, 0.69 Beta, water capacity: 320" d.p. W/C, 1226.98 GPM flow; air capacity: 200" d.p. W/C, 3097.20 SCFM @ 14.7 psia, 5325.20 SCFM @ 20 psig, 10219.28 SCFM @ 100 psig; 10 lb.	8-9 Weeks*	$1,157.15
OP-M-1	Orifice plate flowmeter, 8" line size, 2.400" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 87.95 GPM flow; air capacity: 20" d.p. W/C, 333.87 SCFM @ 14.7 psia, 517.25 SCFM @ 20 psig, 945.28 SCFM @ 100 psig; 14 lb.	4-5 Weeks*	$1,613.55
OP-M-2	Orifice plate flowmeter, 8" line size, 4.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 565.77 GPM flow; air capacity: 100" d.p. W/C, 2014.95 SCFM @ 14.7 psia, 3241.45 SCFM @ 20 psig, 6034.85 SCFM @ 100 psig; 14 lb.	4-5 Weeks*	$1,613.55
OP-M-3	Orifice plate flowmeter, 8" line size, 5.600" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 2195.86 GPM flow; air capacity: 200" d.p. W/C, 5532.00 SCFM @ 14.7 psia, 9525.43 SCFM @ 20 psig, 18290.00 SCFM @ 100 psig; 14 lb.	8-9 Weeks*	$1,613.55
OP-N-2	Orifice plate flowmeter, 10" line size, 5.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 883.04 GPM flow; air capacity: 100" d.p. W/C, 3145.50 SCFM @ 14.7 psia, 5060.38 SCFM @ 20 psig, 9421.74 SCFM @ 100 psig; 20 lb.	4-5 Weeks*	$1,960.30
OP-N-3	Orifice plate flowmeter, 10" line size, 7.000" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 3421.26 GPM flow; air capacity: 200" d.p. W/C, 8626.42 SCFM @ 14.7 psia, 14846.80 SCFM @ 20 psig, 28506.17 SCFM @ 100 psig; 20 lb.	8-9 Weeks*	$1,960.30
OP-O-2	Orifice plate flowmeter, 12" line size, 6.000" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 1271.62 GPM flow; air capacity: 100" d.p. W/C, 4530 SCFM @ 14.7 psia, 7288.16 SCFM @ 20 psig, 13570.33 SCFM @ 100 psig; 30 lb.	4-5 Weeks*	$2,982.85
OP-O-3	Orifice plate flowmeter, 12" line size, 8.400" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 4930.86 GPM flow; air capacity: 200" d.p. W/C, 12430.00 SCFM @ 14.7 psia, 21397.00 SCFM @ 20 psig, 41089.02 SCFM @ 100 psig; 30 lb.	8-9 Weeks*	$2,982.85
OP-P-1	Orifice plate flowmeter, 14" line size, 4.000" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 244.14 GPM flow; air capacity: 20" d.p. W/C, 927.14 SCFM @ 14.7 psia, 1436.59 SCFM @ 20 psig, 2625.81 SCFM @ 100 psig; 40 lb.	4-5 Weeks*	$4,157.60
OP-P-2	Orifice plate flowmeter, 14" line size, 6.600" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 1537.49 GPM flow; air capacity: 100" d.p. W/C, 5477.67 SCFM @ 14.7 psia, 8812.87 SCFM @ 20 psig, 16409.42 SCFM @ 100 psig; 40 lb.	7-8 Weeks*	$4,157.60
OP-P-3	Orifice plate flowmeter, 14" line size, 9.300" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 6052.57 GPM flow; air capacity: 200" d.p. W/C, 15251.50 SCFM @ 14.7 psia, 28262.66 SCFM @ 20 psig, 50437.78 SCFM @ 100 psig; 40 lb.	8-9 Weeks*	$4,157.60
OP-Q-1	Orifice plate flowmeter, 16" line size, 4.500" bore, 0.30 Beta, water capacity: 20" d.p. W/C, 308.76 GPM flow; air capacity: 20" d.p. W/C, 1172.63 SCFM @ 14.7 psia, 1817.05 SCFM @ 20 psig, 3321.32 SCFM @ 100 psig; 48 lb.	4-5 Weeks*	$5,192.60
OP-Q-3	Orifice plate flowmeter, 16" line size, 10.700" bore, 0.70 Beta, water capacity: 320" d.p. W/C, 8007.74 GPM flow; air capacity: 200" d.p. W/C, 20179.85 SCFM @ 14.7 psia, 34749.32 SCFM @ 20 psig, 66737.64 SCFM @ 100 psig; 48 lb.	8-9 Weeks*	$5,192.60
OP-A-2	Orifice plate flowmeter, 0.5" line size, 0.310" bore, 0.50 Beta, water capacity: 100" d.p. W/C, 3.44 GPM flow; air capacity: 100" d.p. W/C, 12.21 SCFM @ 14.7 psia, 19.58 SCFM @ 20 psig, 36.37 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00
OP-A-1	Orifice plate flowmeter, 0.5" line size, 0.200" bore, 0.32 Beta, water capacity: 20" d.p. W/C, 0.62 GPM flow; air capacity: 2.35 SCFM @ 14.7 psia, 3.63 SCFM @ 20 psig, 6.61 SCFM @ 100 psig; 1 lb.	4-5 Weeks*	$473.00

Specifications

Service:: Compatible liquids and gases.
Wetted Material:: 304 SS, Buna-N gaskets.
Accuracy:: ±0.6% full scale flow. (Beta= .2-.6) ±0.7% for Beta greater than .6.
Temperature Limits:: -50 to 200°F (-45 to 93°C).
Pressure Limits:: 150 psi max.
Head Loss:: 1 - Beta ratio², eg: 1 - 07² = 1 - 0.49 = 51% of the d.p.
Line Sizes:: 1/2" to 24".
Process Connections:: 1/4" female NPT.
Installation:: Standard flange 125#/150# rating.
Pipe Requirements:: General requirements 10 diameter upstream and 5 diameter downstream.
Weight:: Varies with line size. See Catalog page.

Features

Mounted with standard flanges
Standard "corner tap" configuration
Corrosion free material
Simplified installation
Built in metering taps (1/4" female NPT STD)
Proven through a wide range of applications for accuracy and energy efficiency
Assures long term reliability and accuracy

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series OP Catalog Page

Drawings

FAQ

Questions

Question

I purchased 4 OP-F-3 orifice plates. I do not find a torque value in the IOM for our flanges. What should these be torqued to? We typically buy 2", 3", and 4" orifice plates and are seeking to standardize on Dwyer. When you provide torque valves include all sizes. Our flanges are 150# RF.

Answer

For all orifice plate installations, please follow the recommended flange torque rating based on the specific flanges used.

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