01222019Tue
Last updateTue, 22 Jan 2019 8pm

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The Nuts and Bolts of Nuts and Bolts

Repairing a valve usually means ­discarding old fasteners and replacing them with new ones. But it takes more than just matching thread diameter and pitch to make the correct fastener selection.

First let’s discuss why a bolting change would be necessary. Nuts and bolts serve two purposes: they hold components in alignment or they provide clamping force. In some cases, they do both. In the case of valve body/bonnet joints, the fastener’s function is to clamp the two pressure-containing valve halves tightly together with a gasket between them to prevent fluid leakage. When a bolt is tightened, it is stretched a small amount. If it was not stretched, there would be no clamping force.

 


Protect Me Please

Everyone in the valve industry should be in the protection racket. No, I don’t mean dealing with cousin Vito from Jersey; I‘m talking about protecting valves after they leave the plant for shipment to the customer or while they are in storage waiting to be used. Valves that are contaminated or damaged before they are installed are a real problem that costs the industry hundreds of thousands of dollars every year to correct, either through repair or replacement.

 

Safety-Relief Valve FAQ

Our company routinely receives inquiries from end users about their safety-relief valves.

Here are some of the most frequently asked questions...


Q:  What is the proper way to install a safety or safety-relief valve?

A: Safety and safety-relief valves should be installed vertically with the drain holes open or piped to a convenient location. All piping must be fully supported.

 

Three Golden Rules for Severe Service Valves

If you’d just bought a new high-performance sports car, you’d likely protect your investment by following the manufacturer’s instructions for breaking in the engine. You’d also probably leave the spare tire in the trunk so that a flat wouldn’t leave you stranded on the side of the road.

PSV Inspection: Test Only, or Full Inspection and Overhaul?

In today’s ever-changing, fast-paced world, uptime is at a premium, while remaining in compliance with governmental and plant regulations is a requirement. With increasing demands placed on plants to produce, it is necessary to look at different ways to perform inspections on pressure relief devices and minimize plant downtime. Many plants in the United States have opted to modify their plant PSM (process safety management) programs to allow a “test only” on each pressure relief device in lieu of a complete disassembly and “VR” overhaul. The intent of this article is to explain the pro’s and con’s of both methods, while balancing additional demands of productivity, cost, safety and environmental issues.

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