The CompaQ meter run is used as primary element in flow measurement of liquid, gas and steam according to the differential pressure principle. The differential pressure transmitter and 3 way manifold valve is mounted directly on the CompaQ ensuring an faster and more safe installation on site. The straight pipe run requirements for optimal accuracy are met with this design.
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Design and calculation standards |
ISO 5167, ISO/TR 15377, BS 1042, ASME MFC-14M, MFC-3M, DIN 19205 Shell Flow Meter Engineering Handbook |
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Sizes |
DN 10 – DN 50, 3/8” - 2" |
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Pressure rating |
PN 10 - 400, 150 - 2500 lbs |
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Plate thickness |
3 mm |
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Vent or drain hole |
Not recommended |
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β (d/D) |
Preferred range 0,5 < β < 0,7 for highest accuracy |
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Plate Material |
AISI 316, other on request. |
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Carrier ring and pipe material |
Carbon steel, AISI 316, other materials on request |
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Pipe run |
Can be honed for increased accuracy |
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Pressure taps |
Transmitter flanges with a 54 mm centre distance |
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Connection |
Weld ends or flanges with flat or raised face or groove according to DIN 2526, 2513 or 2512, or RF and RTJ according to ANSI B 16.5 |
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Orifice plate shapes |
Square edge concentric, other shapes on request. Orifice plates are bevelled on the downstream side |
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Marking |
The orifice plate is marked with "+" and"-" and flow direction. |
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Accuracy |
+/- 0,75 - 1 %(square edge plate), +/- 2 %(conical), +/- 2 - 2,5%(¼ circle) |
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Pressure loss |
Depending on β, for β equal to 0,6 : ca. 60 % of the differential pressure measured |
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Limits for Reynolds No |
Re > 1260 x β^2 D according to ISO 5167 1000 < Re < 10^8 according to ASME MFC-14M |
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3 valve manifold - double flanged, condensing chamber unit for steam flow (only horizontal pipe line) |
DN |
Inches |
Total length (mm) |
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10
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3/8”
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400
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15
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½”
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550
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20
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¾”
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700
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25
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1”
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900
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32
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1 ¼”
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1100
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40
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1 ½”
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1300
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50
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2”
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1500
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To ensure accuracy, the CompaQ meter run should be kept clean and protected against corrosion. Installation requires it to be fitted between straight pipes without obstructions, with specific minimum straight lengths based on beta values. Full bore valves are recommended upstream. For gas applications, the differential pressure transmitter should be installed above the meter run, while for liquid, it should be installed underneath. The bevelled side of the orifice plate is the downstream side. The CompaQ requires no special maintenance but needs to maintain a sharp orifice edge and be free from deposits. Compliance with ISO 5167 and other standards is essential for quality assurance.
Download the installation guide above for more detailed information.
