Quick delivery flow metering solution

Flow Measurement & Control

March 2005 Flow Measurement & Control

Simple, low cost installations are key benefits of insertion-type differential pressure flow devices. The Model 485 Annubar Pak-Lok configuration exemplifies these benefits by introducing an easy-to-use bolt design that meets the traditional ANSI 600# (10 MPa) requirements. This new design exerts three times as much sealing force as previous Pak-Lok designs that relied on a large thread type sealing. The Pak-Lok configuration also offers cost savings when compared to other mounting types and quick delivery to meet critical application deadlines.

Safe and simple installation

A compression mechanism is used to pin the sensor to the inside opposite pipe wall. This configuration meets the same requirements as an ANSI 600# (10 MPa) flanged assembly.

The sensor remains sealed against the opposite wall regardless of changes in pipe diameter due to pressure, temperature or mechanical force. This eliminates the need for opposite side support to ensure structural integrity. No special pipe sections, flanges, or pipe modification is required.

The body is a single cast part that arrives ready-to-weld, with no parts to assemble. It can be easily centred over the mounting hole and welded to the pipe. Packing rings are used to create a tight seal between the welded Pak-Lok body and Annubar sensor, eliminating any potential leak paths or fugitive emission points. Split-ring lock washers are used so the installer knows to stop tightening the bolts. The tight seal created by the packing also safely seals the Annubar sensor in the mounting hardware.

Standard size studs and nuts are used to secure the Annubar assembly in the Pak-Lok body. This is an improvement over previous designs based on a single, non-traditionally sized nut Pak-Lok body. A standard wrench can be used to torque the nuts and the small threads on the studs are not susceptible to galling.

Unique to the Model 485 is the ability to remove the entire flowmeter from the process and re-install it by simply replacing the graphite packing rings. Other compression designs, such as ferrule mounting systems, do not possess this flexibility.

Reduce installation costs

Considerable cost savings are to be had when compared to other mounting types; instead of flanges, nuts, and bolts, a single cast Pak-Lok body is used, which significantly reduces material costs. Since the Pak-Lok assembly pins the sensor to the inside wall of the pipe, a second pipe penetration is not required for additional support. This further reduces the cost associated with hardware and installation time.

Pak-Lok hardware and installation time is less expensive than a flanged assembly. This can result in savings by as much as 35% per installation. This makes the Pak-Lok assembly a practical and cost efficient mounting choice.

For more information contact Alpret Control Specialists, 0861 113 393, [email protected], www.alpret.co.za/annubar

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Flow Measurement & Control

Quick delivery flow metering solution

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