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May 28, 2023

ISO 5167-2 Orifice Plates: Description, Installation and Calibration

What You Need to Know About Iso 5167 2 Orifice Plates Pdf Free

If you are looking for a reliable and accurate way to measure the flow rate of fluids in circular conduits, you might want to consider using Iso 5167 2 Orifice Plates. These are pressure differential devices that are inserted in the conduit to create a pressure drop that is proportional to the flow rate. In this article, we will explain what Iso 5167 2 Orifice Plates are, how they work, and how to use them properly.

Iso 5167 2 Orifice Plates Pdf Free

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What are Iso 5167 2 Orifice Plates?

Iso 5167 2 Orifice Plates are thin metal plates with a circular hole in the center that are placed perpendicular to the flow direction in a conduit. They are part of the Iso 5167 standard, which covers the geometry and method of use of various pressure differential devices for fluid flow measurement. Iso 5167 2 specifies the dimensions, tolerances, materials, and installation requirements of orifice plates for different types of pressure tappings, such as corner, D and D/2, and flange.

How do Iso 5167 2 Orifice Plates work?

When a fluid flows through an orifice plate, it accelerates through the hole and creates a low-pressure zone downstream of the plate. The difference between the upstream and downstream pressures is measured by pressure taps that are connected to a differential pressure transmitter. The flow rate can then be calculated using the Bernoulli equation and the discharge coefficient of the orifice plate, which depends on the geometry and the Reynolds number of the flow. The discharge coefficient can be obtained from tables or empirical formulas provided by Iso 5167 2.

How to use Iso 5167 2 Orifice Plates properly?

To ensure accurate and reliable flow measurement with Iso 5167 2 Orifice Plates, you need to follow some installation and operating guidelines. Here are some of them:

Choose an orifice plate that matches the size and material of the conduit and has a suitable bore diameter for the expected flow range.

Install the orifice plate with the correct orientation and alignment with respect to the flow direction and the pressure taps.

Provide sufficient upstream and downstream straight lengths of pipe to avoid flow disturbances caused by bends, valves, fittings, or other obstructions.

Use flow conditioners if necessary to improve the flow profile and reduce turbulence.

Check the circularity and cylindricality of the pipe and ensure that there are no leaks or deposits that could affect the flow measurement.

Calibrate the orifice meter periodically using a reference standard or a test facility.

By following these guidelines, you can achieve high accuracy and repeatability with Iso 5167 2 Orifice Plates.

Conclusion

Iso 5167 2 Orifice Plates are widely used pressure differential devices for fluid flow measurement in circular conduits. They offer many advantages, such as low cost, simple installation, low maintenance, and wide applicability. However, they also require careful selection, installation, and calibration to ensure optimal performance. If you want to learn more about Iso 5167 2 Orifice Plates Pdf Free, you can download the standard from here.

What are the advantages and disadvantages of Iso 5167 2 Orifice Plates?

Iso 5167 2 Orifice Plates have some advantages and disadvantages compared to other pressure differential devices or flow meters. Here are some of them:

Advantages:

They are low-cost and easy to manufacture and install.

They are suitable for a wide range of fluids, temperatures, pressures, and flow regimes.

They have a low sensitivity to upstream disturbances and can be used with or without flow conditioners.

They have a high accuracy and repeatability if calibrated and installed properly.

They have a low maintenance requirement and a long service life.

Disadvantages:

They cause a permanent pressure loss that reduces the energy efficiency of the system.

They have a limited rangeability (the ratio of maximum to minimum flow rate) and may require different orifice plates for different flow conditions.

They may be affected by erosion, corrosion, or deposits that could alter the orifice geometry and affect the flow measurement.

They may require temperature and pressure compensation to account for the fluid properties and compressibility effects.

How to download Iso 5167 2 Orifice Plates Pdf Free?

If you want to download Iso 5167 2 Orifice Plates Pdf Free, you can do so from the official website of Iso. Iso is the International Organization for Standardization, which develops and publishes international standards for various fields and industries. Iso 5167 is one of the standards that covers the measurement of fluid flow by means of pressure differential devices.

To download Iso 5167 2 Orifice Plates Pdf Free, you need to follow these steps:

Go to this link, which is the page for Iso 5167-2:2022.

Click on the "Buy this standard" button on the right side of the page.

Select your preferred format (PDF or paper) and language (English or French).

Add the standard to your cart and proceed to checkout.

Fill in your billing and delivery details and choose your payment method.

Confirm your order and complete the payment process.

You will receive an email with a link to download your Iso 5167 2 Orifice Plates Pdf Free.

Note that Iso 5167 2 Orifice Plates Pdf Free is not actually free, but it costs CHF 138 (Swiss francs), which is equivalent to about USD 150 (US dollars). However, you can preview some pages of the standard for free before buying it.

Conclusion

Iso 5167 2 Orifice Plates are one of the most common and widely used pressure differential devices for fluid flow measurement in circular conduits. They offer many benefits, such as low cost, simple installation, low maintenance, and wide applicability. However, they also have some drawbacks, such as permanent pressure loss, limited rangeability, and potential erosion or corrosion. Therefore, they need to be selected, installed, and calibrated carefully to ensure optimal performance. If you want to learn more about Iso 5167 2 Orifice Plates Pdf Free, you can download the standard from here.

How to compare Iso 5167 2 Orifice Plates with other pressure differential devices?

Iso 5167 2 Orifice Plates are not the only pressure differential devices that can be used for fluid flow measurement in circular conduits. There are also other devices, such as nozzles, Venturi tubes, cone meters, and wedge meters, that have different characteristics and applications. Iso 5167 covers all these devices in its six parts.

To compare Iso 5167 2 Orifice Plates with other pressure differential devices, you need to consider some factors, such as:

The accuracy and uncertainty of the flow measurement.

The rangeability and turndown ratio of the device.

The pressure loss and energy consumption of the device.

The installation and maintenance requirements of the device.

The suitability of the device for different fluids, temperatures, pressures, and flow regimes.

Generally speaking, Iso 5167 2 Orifice Plates have a lower accuracy and a higher uncertainty than other pressure differential devices. They also have a lower rangeability and a higher pressure loss. However, they have a lower cost and a simpler installation and maintenance than other devices. They are also suitable for a wide range of fluids and flow conditions.

How to optimize Iso 5167 2 Orifice Plates for your specific application?

Iso 5167 2 Orifice Plates are versatile and adaptable devices that can be used for various applications and industries. However, to optimize their performance and efficiency, you need to customize them according to your specific needs and preferences. Here are some tips on how to optimize Iso 5167 2 Orifice Plates for your specific application:

Choose the appropriate type and size of orifice plate for your expected flow range and fluid properties.

Choose the best location and orientation of the pressure taps for your measurement accuracy and convenience.

Use flow conditioners if necessary to improve the flow profile and reduce the uncertainty of the measurement.

Use temperature and pressure compensation if necessary to account for the fluid properties and compressibility effects.

Calibrate your orifice meter regularly using a reference standard or a test facility to ensure its accuracy and repeatability.

By following these tips, you can optimize Iso 5167 2 Orifice Plates for your specific application and achieve the best results possible.

How to troubleshoot Iso 5167 2 Orifice Plates?

Iso 5167 2 Orifice Plates are usually reliable and robust devices that do not require much troubleshooting. However, sometimes they may encounter some problems that could affect the flow measurement and cause errors or uncertainties. Here are some common problems and how to troubleshoot them:

Leakage: If there is a leakage in the pipe, the orifice plate, the pressure taps, or the differential pressure transmitter, it could cause a false pressure drop and an erroneous flow rate. To troubleshoot this problem, you need to check the integrity of the system and fix any leaks or cracks that you find.

Erosion or corrosion: If the orifice plate is exposed to abrasive or corrosive fluids, it could wear out or deteriorate over time and change its geometry and discharge coefficient. To troubleshoot this problem, you need to inspect the orifice plate regularly and replace it if it shows signs of damage or deformation.

Deposits: If the fluid contains solid particles or impurities, they could accumulate on the orifice plate or the pipe wall and reduce the effective area of the orifice or alter the flow profile. To troubleshoot this problem, you need to clean the orifice plate and the pipe periodically and remove any deposits that you find.

Temperature or pressure variations: If the fluid temperature or pressure changes significantly during the measurement, it could affect the fluid density, viscosity, compressibility, and expansibility, and thus the flow rate. To troubleshoot this problem, you need to use temperature and pressure compensation to correct for these effects.

How to improve Iso 5167 2 Orifice Plates?

Iso 5167 2 Orifice Plates are already well-designed and standardized devices that have been proven to work effectively for fluid flow measurement in circular conduits. However, there is always room for improvement and innovation to enhance their performance and efficiency. Here are some possible ways to improve Iso 5167 2 Orifice Plates:

Use smart orifice plates: Smart orifice plates are orifice plates that have built-in sensors and transmitters that can measure not only the differential pressure but also other parameters such as temperature, pressure, density, viscosity, and flow direction. They can also communicate wirelessly with a central controller and provide real-time data and diagnostics.

Use multi-hole orifice plates: Multi-hole orifice plates are orifice plates that have multiple holes of different sizes and locations instead of a single hole in the center. They can improve the flow measurement accuracy by reducing the effects of upstream disturbances, flow profile asymmetry, swirl, and pulsation.

Use adaptive orifice plates: Adaptive orifice plates are orifice plates that can change their geometry dynamically according to the flow conditions. They can improve the rangeability and turndown ratio of the device by adjusting the effective area of the orifice to match the flow rate.

By using these improved Iso 5167 2 Orifice Plates, you can achieve better results and save more energy and resources.