![]() Do they mean the same thing? Not exactly. Often, however, the letters “WOG,” “CWP,” “WSP,” or other abbreviations, along with a number, are imprinted or cast on the valve. Source: Restek WOG and WSP ratings are expressed in PSIG and indicate allowable pressures at a given temperatureįor safety’s sake, each valve used in fire protection – from control valves to the trim valves used to drain and test sprinkler and standpipe systems – should be used only at pressures the valve can safely withstand. This brand-new (and calibrated) Ashcroft pressure gauge reads slightly below zero, suggesting that the gauge may have been calibrated at a lower elevation. In most applications, PSI is used as shorthand for PSIG (pounds per square inch gauge): the pressure in a piping system relative to the pressure of the surrounding atmosphere. Pressure gauges are calibrated to ignore this atmospheric pressure – to treat it as the “ zero” – and provide you with a reading of the difference between the pressure in your pipes and the pressure of the surrounding air. ![]() At sea level, atmosphere presses down on an average human body with a metric ton of force. While there are many ways to measure pressure – including BAR, kPa, and others – PSI is the most frequently-used standard by measuring instruments in the United States. PSI measures the pressure of the gas, liquid, or semisolid as it presses against a square inch of pipe or the inside of other fittings. In plumbing and pipefitting, one often-used measurement of pressure is pounds per square inch, or PSI. A dull knife distributes that same force around a larger area, spreading the effort thin (which is why you have to press harder with a dull blade than a sharp one). A finely-sharpened knife has a pointed end that concentrates all of the energy – the force – into a small area, which allows the knife to more easily penetrate the surface of the things it cuts. It explains why a sharp knife makes faster and cleaner cuts than a dull one. Pressure is a measurement of how force is distributed on the surface of impact. Force and area define PSI, a basic measurement of pressure In this article, we’ll explain how these and other measurements differ, and what you need to know to pick a fire protection valve with a suitable pressure rating.Īre you looking for an overview of trim valves for fire protection systems? Click here to read our guide. Part of the confusion stems from the fact that most valves have more than one use: even valves listed specifically for fire protection service may have applications in other water-based systems or even non-water systems containing chemicals, petroleum, gases, or other substances.Ĭompounding this problem is the wide range of acceptable terms used to describe fire safety valve pressure ratings, including WOG, WSP, and PSI. WOG (Water, Oil, Gas), WSP (Working Steam Pressure), and PSI (Pounds per Square Inch) are closely-related – but not interchangeable – concepts manufacturers use to describe how much pressure a valve can withstandįire sprinkler and standpipe systems feature a wide range of valves, but it’s not always easy to tell if they’ve got what it takes to withstand or control the pressurized air and water running through them.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |