Our best Flow articles

In this section we will find articles related to flow measurement in the process industry. Some describe techniques and others allow you to discover more advanced concepts. All the articles have been written with the idea of ​​introducing and explaining concepts related to instrumentation in the process industry. Each article has a version prepared in pdf format for download and diffusion. If you have any questions or require further clarification, do not hesitate to contact us

Orifice Plate Installation Guidelines

This post is mainly a set of rules for the orifice plate installation like an orifice flow meter installation guidelines. In order that a flow instrument may accurately read flow, it’s necessary that the installation comply with certain rules.

Difference between Actual, Standard and Normal Flows

Gas density changes with pressure and temperature, so the use of standardized volumes when referring to quantities of gas is mandatory. Standardized volumes are commonly used in different types of industries which uses gas as raw material. The volum of gas ...

Pressure and Temperature Flow Compensation Formula

In steam or gas flow measurement, the density of the steam or gas changes as pressure and temperature change. This change in density can affect the accuracy of the measured flow rate if it is uncompensated.

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Frequently Asked Questions

Q1 - How does a orifice flow meter work?

An orifice flow meter operates based on the principle of measuring the differential pressure across a constriction in a pipe. It consists of a circular orifice plate with a precisely drilled hole installed in the pipe, which causes the flow to constrict as it passes through. As fluid flows through the orifice, its velocity increases, and the pressure decreases. The pressure differential between the upstream and downstream sides of the orifice is proportional to the flow rate. This differential pressure is measured using pressure sensors, such as a differential pressure transmitter. By applying the Bernoulli equation, the flow rate can be calculated using the measured pressure drop. The orifice flow meter is suitable for measuring the flow of liquids, gases, and steam.

Q2 - How to calibrate orifice flow meter?

Calibrating an orifice flow meter is crucial to ensure accurate measurements. The calibration process involves comparing the actual flow rate with the flow rate indicated by the flow meter. This is typically done in a controlled environment using a reference standard, such as a master flow meter or a volumetric flow standard. The calibration involves adjusting the meter's coefficient (known as the discharge coefficient) to account for any discrepancies between the indicated and actual flow rates. The technician may also calibrate the differential pressure transmitter to ensure accurate pressure readings. Regular calibration is essential to maintain the accuracy of the orifice flow meter over time.

Q3 - How to design orifice flow meter?

Designing an orifice flow meter involves selecting the appropriate orifice plate size, shape, and material based on the fluid properties and the required flow measurement accuracy. The design also includes determining the location for installation, which is typically a few pipe diameters downstream of any disturbances like bends or valves. Additionally, the design should consider the use of a differential pressure transmitter and associated instrumentation for pressure measurement. The orifice plate dimensions, including the orifice diameter and the downstream tapping location, must adhere to recognized industry standards, such as ISO 5167. Proper design ensures accurate and reliable flow measurements.

Q4 - Can flow meters be installed vertically?

Flow meters can be installed vertically under certain conditions. The orientation of a flow meter depends on the type and design of the flow meter and the specific application. Many flow meters, including orifice flow meters, can be installed vertically, but they must meet certain criteria. When installing a flow meter vertically, it's important to consider factors such as the flow direction, the effects of gravity on the fluid flow, and any potential air or gas pockets that may develop in the line. Proper installation and orientation are critical to ensure the accurate measurement of flow, and manufacturers' guidelines and industry standards should be followed to determine the suitability of vertical installation for a particular flow meter in a given application.

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