GENERAL:
This specification describes a differential pressure type of metering primary for the main line metering of air in a__" pipe. The orifice plate flow meter "Oripac Model 4150-P" wafer type unit shall include high & low metering taps utilizing a "corner tap" configuration. Orifice primary shall meet or exceed ASME requirements for corner style metering taps with regards to accuracy, tolerances & calculations. A flow vs differential pressure curve shall be provided for each set of flow conditions.
MOUNTING:
The orifice metering primary shall be suitable for installation between standard ANSI 125#/150# PVC or steel flanges mounted on
HDPE, PVC or Galvanized aluminum pipe. The unit shall be "self centering" within the bolt circle of the flanges. No alignment of the orifice shall be necessary. Drilling and or tapping of the main or flanges will not be allowed or required. The overall laying length shall be 1.25" including pre-attached ring type 1/8" thick Buna "N" Gaskets.
CAPACITY:
Normal air flow rate of
_____SCFM at a differential pressure to be determined by Lambda Square Inc. at pressures & temperatures provided by engineer and calculated by Lambda Square Inc.
MATERIALS OF CONSTRUCTION:
The Oripac Model 4150-P primary element shall be monolithic (single piece) constructed entirely of Grade 2 gray PVC or CPVC. Metering connections shall be 1/8" or 1/4" NPT female taps. Hose barb connections or extension nipples may be threaded to high & low pressure connections if desired. |
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ACCURACY:
The orifice primary shall be precision
calculated, bored and bench calibrated to ASME & ISO specifications yielding a predictable accuracy of +/- 0.6 % of full scale flow. Calculations shall be performed by Lambda Square Inc. to determine exact differential & headloss at full scale & normal flow conditions. Calculation formulas shall be based on ASME guidelines. The orifice primary shall be tested under similar conditions for at least 15 years and shall be equal in all respects to ORIPAC Model 4150-P as manufactured by Lambda Square Inc. of Babylon, NY.
METER PERFORMANCE:
The Oripac 4150-P flow meter may also be used to dissipate pressure while simultaneously measuring the air flow through the main line. Calculations for the pressure dissipation shall be performed in conjunction with the Oripac flow calculations by Lambda Square Inc. The overall pressure loss and differential pressure shall be determined at maximum & normal flow conditions. The permanent headloss shall be within the requirements of the application, and determined by the engineer in conjunction with Lambda Square Inc. |
MODEL 4150-P SPECIFICATION SHEET
