Iso 5167 2 Orifice Plates Pdf Free

What is ISO 5167-2 and how to download it for free?

ISO 5167-2 is an international standard that specifies the geometry and method of use of orifice plates for measuring the flow rate of fluids in circular cross-section conduits. Orifice plates are one of the most common types of pressure differential devices, which are inserted in a pipe to create a pressure drop that is proportional to the flow rate. ISO 5167-2 provides the formulas and procedures for calculating the flow rate and the uncertainty of the measurement, as well as the requirements for the installation and operating conditions of the orifice plates.

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If you are interested in learning more about ISO 5167-2, you might want to download a PDF copy of the standard for free. However, this might not be as easy as it sounds. ISO standards are protected by copyright and are not available for free on the internet. You can only access them legally by purchasing them from the ISO website or from an authorized distributor. The price of ISO 5167-2 is CHF 187, which is equivalent to about EUR 170 or USD 200.

However, there are some ways to get a PDF copy of ISO 5167-2 for free, or at least for a lower price. Here are some tips:

• Check if your organization has a subscription to an online library or database that includes ISO standards. Some examples are IHS Markit, Techstreet, or ANSI. If so, you might be able to access ISO 5167-2 online or download it for free.

• Check if your local library has a hard copy of ISO 5167-2 in its collection. If so, you might be able to borrow it or scan it for free.

• Check if there are any academic papers or reports that cite or use ISO 5167-2. If so, you might be able to find them online or in a library and get some information from them. For example, this paper compares different methods for measuring gas flow using orifice plates and references ISO 5167-2.

• Check if there are any unofficial copies of ISO 5167-2 on the internet. However, be careful with this option, as these copies might be outdated, incomplete, inaccurate, or illegal. For example, this PDF file claims to be ISO 5167-2:2003, but it is actually a draft version from 2001 and does not include all the changes and corrections that were made in the final version.

In conclusion, ISO 5167-2 is a useful standard for measuring fluid flow using orifice plates, but it is not easy to get a PDF copy of it for free. You might have to pay for it, look for alternative sources, or use other methods for measuring flow rate. How to use orifice plates according to ISO 5167-2?

Orifice plates are simple and inexpensive devices that can be used to measure the flow rate of fluids in pipes. However, to ensure accurate and reliable results, they have to be used according to the specifications and guidelines of ISO 5167-2. Here are some of the main aspects to consider when using orifice plates:

• The type and size of the orifice plate. ISO 5167-2 defines four types of orifice plates: concentric, eccentric, segmental, and quadrant-edge. Each type has different advantages and disadvantages depending on the fluid properties, flow regime, and installation conditions. The size of the orifice plate is determined by the diameter ratio, which is the ratio of the orifice bore diameter to the pipe diameter. The diameter ratio affects the pressure drop, the flow coefficient, and the uncertainty of the measurement. ISO 5167-2 provides tables and formulas for selecting the appropriate type and size of the orifice plate for a given application.

• The installation and alignment of the orifice plate. ISO 5167-2 specifies the minimum requirements for installing and aligning the orifice plate in the pipe. These include the distance from upstream and downstream fittings, such as valves, bends, reducers, or expanders, that might affect the flow profile; the orientation of the orifice plate relative to the pipe axis and gravity; the sealing and fastening of the orifice plate to prevent leakage or movement; and the inspection and cleaning of the orifice plate to avoid damage or fouling.

• The pressure tapping and measurement. ISO 5167-2 defines three types of pressure tapping: flange tapping, corner tapping, and D-D/2 tapping. Each type has different locations for measuring the upstream and downstream pressures across the orifice plate. The pressure tapping affects the pressure differential, which is used to calculate the flow rate. ISO 5167-2 provides formulas and corrections for converting the measured pressures to standard conditions. The pressure measurement should be done with suitable instruments that have adequate accuracy and range.

• The calculation and uncertainty of the flow rate. ISO 5167-2 provides formulas for calculating the flow rate from the pressure differential, taking into account factors such as fluid density, viscosity, compressibility, Reynolds number, expansion factor, discharge coefficient, and beta ratio. ISO 5167-2 also provides methods for estimating the uncertainty of the flow rate measurement, which depends on various sources of error such as calibration, installation, operation, and environmental conditions.

In summary, ISO 5167-2 is a comprehensive standard that covers all aspects of using orifice plates for measuring fluid flow in pipes. By following its specifications and guidelines, users can obtain accurate and reliable results with minimal cost and complexity. What are the advantages and disadvantages of orifice plates?

Orifice plates are widely used for measuring fluid flow in pipes because they have several advantages over other methods. However, they also have some disadvantages that should be considered before choosing them. Here are some of the pros and cons of orifice plates:

AdvantagesDisadvantages

- Simple and inexpensive to manufacture, install, and maintain.- Cause a permanent pressure loss in the pipe, which reduces the efficiency of the system.

- Suitable for a wide range of pipe sizes, fluid types, and flow conditions.- Sensitive to changes in fluid properties, flow regime, and installation conditions, which affect the accuracy and reliability of the measurement.

- Compatible with various types of pressure tapping and measurement instruments.- Require a long straight pipe section upstream and downstream of the orifice plate to ensure a fully developed and stable flow profile.

- Based on a well-established and standardized theory and practice.- Have a relatively high uncertainty compared to other methods, especially for low flow rates and high viscosity fluids.

In conclusion, orifice plates are a simple and inexpensive method for measuring fluid flow in pipes, but they also have some drawbacks that might affect their performance and suitability for certain applications. Users should weigh the advantages and disadvantages of orifice plates before deciding to use them. What are some alternatives to orifice plates?

Orifice plates are not the only method for measuring fluid flow in pipes. There are other devices and techniques that have different principles, characteristics, and applications. Here are some of the most common alternatives to orifice plates:

• Venturi tubes: Venturi tubes are devices that have a converging section, a throat, and a diverging section. They create a pressure differential by accelerating and decelerating the fluid flow through the sections. Venturi tubes have lower pressure loss, higher accuracy, and wider rangeability than orifice plates, but they are more expensive, bulky, and difficult to install and maintain.

• Flow nozzles: Flow nozzles are devices that have a smooth converging section and a sharp-edged throat. They create a pressure differential by accelerating the fluid flow through the section and throat. Flow nozzles have lower pressure loss, higher accuracy, and wider rangeability than orifice plates, but they are more sensitive to erosion, corrosion, and fouling.

• Pitot tubes: Pitot tubes are devices that have a small opening facing the fluid flow and another opening perpendicular to it. They measure the total and static pressures of the fluid at the openings and calculate the flow rate from the difference. Pitot tubes have no pressure loss, high accuracy, and wide rangeability, but they are more sensitive to flow profile distortion, alignment errors, and blockage.

• Turbine meters: Turbine meters are devices that have a rotor with blades that spin in proportion to the fluid velocity. They measure the rotational speed of the rotor and calculate the flow rate from it. Turbine meters have low pressure loss, high accuracy, and wide rangeability, but they require power supply, calibration, and maintenance.

• Ultrasonic meters: Ultrasonic meters are devices that use sound waves to measure the fluid velocity. They send and receive ultrasonic signals across or along the pipe and calculate the flow rate from the time difference or frequency shift. Ultrasonic meters have no pressure loss, high accuracy, and wide rangeability, but they require power supply, calibration, and signal processing.

In conclusion, there are many alternatives to orifice plates for measuring fluid flow in pipes, each with its own advantages and disadvantages. Users should consider their specific needs and preferences when choosing the most suitable method for their application. I have written enough for the article. Do you want me to do something else? ?