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ORIPAC MODEL 4150-P
• About the Oripac Model 4150-P • Dimension Sheet Tech Support Sheet
• Part No. Reference System • Specification Sheet • Installation Instructions
MODEL 4150-P TECH SUPPORT SHEET

The importance of proper pressure tap connections for orifice plate installations is often minimized or overlooked in the field. Faulty connections nullify the precision of the machining in the manufacture of the orifice plate and calibration accuracy of the secondary instrument. An orifice plate, properly installed, will provide satisfactory, low-cost service over a wide capacity range.

ADVANTAGES:
Lambda Square, Inc. has developed the ORIPAC to combine accuracy of measurement with certainty of correct installation. Made by specialists in the manufacture of metering equipment, the ORIPAC provides the following advantages over orifices installed with main line taps.

1. Easy Installation is accomplished through elimination of drilling and taping pressure pipe connections. ORIPAC features factory made pressure taps so that drilling and tapping of the pipe line is unnecessary and the possibility of faulty installation of taps is avoided.

2. Errors resulting from incorrect pressure tap locations are avoided. Incorrect tap locations will cause inaccurate meter readings as the differential pressure measured will not correspond to the flow for which the secondary instrument has been calibrated. The downstream tap location is particularly critical in this respect. An Installation made with the ORIPAC which has the tap locations accurately placed in manufacture and secondary instrument calibrated accordingly, is not subject to such errors.

3. Factory-made pressure connections in the ORIPAC do away with the possibility of protruding nipples in the pipeline. Nipples protruding beyond the inner surface of the pipe create flow conditions unlike those on which the secondary instrument calibration is based. The amount of disturbance depends upon the degree of nipples protrusion, being more critical for downstream connections.

4. Tapping and drilling are unnecessary when the ORIPAC is used. Therefore, the possibility of burrs on the inner pipe surface is eliminated. Such burrs cause flow disturbances and consequent metering inaccuracies similar to those resulting from protruding nipples.

5. Location of pressure pipe connections in the ORIPAC overcomes metering errors caused by pipe friction between connections as made in other type orifice installations.

6. Exact centering of orifice plates aided by the concentric finish on the rim of the ORIPAC adds to overall accuracy of the installation.

7. Metering pipe taps frequently plug due to corrosion. The ORIPAC’s built in PVC metering taps minimize corrosion.
The many advantages in their installation and operation clearly indicate the superiority of the ORIPAC for the majority of conditions under which an orifice installation is suitable.

Overall Pressure Loss Across
Thin-Plate Orifices (Oripac)

The above curved graph shows pressure loss generated by the ORIPAC. For example, a 0.6 Beta Ratio (d/D) would show a loss of 62%. This is also shown on the linear graph area ratio (d/D)² =.38 with a loss of 62%.

As a quick check reference, you can use the formula:
Headloss=1-Beta Ratio² eg: 1-.62² or 1 - .38 = 62%
Source: ASME Research Report on Fluid Meters
MODEL 4150-P

ACCURACY

The Oripac utilizes the corner tap proportions as defined in ISO 5167. While this code may not be referred to as International Standard until accepted by the ISO Council, the ASME Fluid Meters Research Committee has suggested that the dimensionless coefficient equation developed by the International Standards Organization (ISO) and presented in ISO 5167 is significantly better for the broad spectrum of flow measurement applications throughout process industries.

The coefficient values used in the ORIPAC bore calculations represent the same confidence level assigned to the flange and radius taps widely accepted in fluid flow measurement.

The accuracy assigned to the coefficient values is ± 0.6% full scale for d/D (Beta) values 0.2 to 0.6 and ± ß% for Beta values 0.6 to 0.75 (i.e. ß of 0.7 would have an uncertainty value of ± 0.7% full scale).

Accuracy of the differential signal produced by the ORIPAC equals that of a properly manufactured and installed flange or radius tap orifice meter.

The elimination of errors caused by poor installation practices as well as the fact that all critical ORIPAC components are manufactured in corrosion resistant materials gives the ORIPAC an installed and sustained accuracy beyond that of the normal flange or radius tap orifice plate installation.
 

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