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Pigtail loop diameter

Standard pigtail loop diameters typically range from 1/4 inch to 1/2 inch, depending on the application and pressure requirements.

Overview

A pigtail loop is a coiled or looped section of tubing installed between a pressure gauge and the process line to protect the instrument from high-temperature fluids, steam, and pressure surges. The loop allows condensate to form, creating a protective barrier that prevents direct contact of hot media with the gauge, while also absorbing vibration and thermal expansion.

Standard Diameters

Common diameters: 1/4", 3/8", and 1/2" for standard instrumentation applications. Material considerations: Pigtails are typically made from carbon steel, stainless steel (316/316L), or brass, with wall thicknesses conforming to ANSI B36. 10 and B36.

19 standards. Custom sizes: Larger diameters up to 1" can be manufactured for high-pressure or specialized applications.

Design Considerations

Loop size: The diameter of the loop should be sufficient to allow condensate retention and prevent heat transfer to the gauge. A larger loop can improve cooling and reduce stress on the instrument. Installation orientation: Vertical or horizontal installation affects condensate collection and protection efficiency.

Pressure and temperature: The internal diameter and coil length are selected based on the process pressure, temperature, and type of media to ensure proper function without restricting flow.

Functionality

The pigtail loop acts as a thermal and pressure buffer, enhancing the reliability and service life of gauges and transmitters. It prevents high-temperature steam or corrosive gases from reaching sensitive components and minimizes vibration transfer, which improves measurement accuracy. In summary, selecting the correct pigtail loop diameter is crucial for effective protection of pressure instruments, with 1/4" to 1/2" being standard for most applications, while larger or custom diameters may be required for high-pressure or specialized systems.

Pigtail loop diameter

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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