Figure 2 shows a single chamber orifice meter
with a downstream pressure tap and an extra DP transmitter.
The customer's installation consisted of a reciprocating compressor station with four inlet and outlet orifice meters
Meter tubes, also called "meter runs," are critical parts of the orifice meter
because the honed surface finish influences accuracy.
After calibration in the supplier's flow lab, they provide performance comparable to traditional orifice meters
, but with no more than two diameters of straight pipe upstream and downstream, and no additional flow conditioning.
These formulas are derived from the basic equation for the flow rate through an orifice meter
, and estimate errors in measured flow rate due to changes in physical dimensions of the plate and the downstream flow field.
However, although wet gas flow DP has a significantly higher standard deviation than the dry gas flow DPs, massed orifice meter
wet gas data sets have shown that the average DP is still repeatable and reproducible.
A rotameter, specially designed for diesel engine exhaust gas was used to measure the flow rate of the exhaust and the same is verified using an orifice meter
The pipes, attached to an orifice meter
to check the flow of secondary coolant, are similar to the one that ruptured and caused the fatal accident.
Reducing the bore diameter will increase the pressure drop of the orifice meter
and report incorrect mass flow.
The checking was mainly conducted around the downstream part of the orifice meter
for secondary cooling water.
For over 150 years, American Meter has pioneered many of the major developments in gas measurement: iron-case meters for the higher pressures of natural gas; coin-operated prepayment meters that helped increase gas usage; the first practical orifice meter
, lighter, easier-to-handle aluminum case meters; synthetic, molded diaphragms for residential meters and temperature compensating indexes.
A proper orifice meter
installation is one key to accurate flow measurement.