02072016Sun
Last updateFri, 05 Feb 2016 4pm

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Technical

Back to Basics: Pressure Relief Devices, Part 2

Back to Basics Pressure Relief Devices Part 2In Part 1 of Pressure Relief Devices, which appears in VALVE Magazine’s Winter 2016 issue, the author stresses the vital role pressure relief devices play in keeping end-user industries that deal with pressurized equipment safe. Such devices consist of reclosing- and nonreclosing-type devices. The magazine article covers reclosing; this article addresses the nonreclosing types of devices.


Protecting Valves and Actuators from the Cold

Protecting Valves and Actuators from the ColdWinter is here! For most states east of the Rockies, January and February are the coldest times of the year. In the northern states, the average temperature during these months is below freezing.

These environmental conditions can wreak havoc on pipelines. Freezing can render valves inoperable; the valve can lock up, and if there’s water it can break the gear housings. This article gives some examples of what can happen when valves aren’t properly winterized and describes how you can protect valves and actuators from the cold.

Tips: Stuffing Boxes and Quarter-Turn Valves

tips packings imageEditor’s Note: This is the first in a series planned by VALVE Magazine that will give you, our readers, the opportunity to share tips that you have found helpful in your career. It could be an unusual way of handling a problem, or perhaps you’ve learned something quick and easy during the course of a project that has saved you time or money. Is there a tip or technique that was passed down to you by someone that you would like to share? Submit your tips to This email address is being protected from spambots. You need JavaScript enabled to view it..

Recently I had the pleasure of listening to a presentation on stuffing box design. The speaker mentioned that an ideal stuffing box contains 5 rings of packing and that deeper stuffing boxes are not preferred as only the two packing rings nearest the outside of the valve are fully compressed by the force from the packing follower. This is because of friction between these packing rings and the stuffing box walls that prevents compression forces reaching the inward packing rings.

I fully agree with the speaker’s comments.

Enhancing Valve Component Performance Through Design by Nanolamination

NanolaminationToday, the total cost of corrosion in the U.S. exceeds $1 trillion annually—and from oil & gas operations to municipal infrastructure, metal-based components like valves are in some of the most corrosive environments imaginable. Some techniques to prevent corrosion are cost-effective but may not be long lasting. Others are quite effective but can be costly. Manufacturers continue to seek new ways to prevent corrosion. Here is a new process that is showing great promise.

Low-Temperature Sealing with Elastomers in Sour Gas

Low Temperature Sealing with Elastomers in Sour GasLow-temperature sealing with elastomers is critical in both arctic regions and subsea valves. Additionally, sour gas or hydrogen sulfide is increasingly being found in oil and gas production as more challenging fields are being developed throughout the world. Valves are being asked to perform in sour conditions that involve expanded temperature ranges along with pressure cycles. The performance of the seals in a valve is often the limiting factor in a valve’s performance; knowing the effects of low-temperature and sour gas on elastomers is critical in oil and gas valve applications. While many engineers are comfortable specifying metals for valves in sour environments, they may not have an understanding of the performance limitations of the elastomers. The limitations for elastomers that will determine a successful seal in a valve often include properties such as oil resistance along with high- and low-temperature performance. Following is a review of these limitations from the perspective of low-temperature performance and sour gas resistance. Additionally, strategies will be provided to ensure the best seals are selected for a given application.

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