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Three physical methods are used to measure the different types of pressures. The different types of pressures are gauge pressure JJ Arcega-Whiteside Game Jersey , differential pressure, absolute pressure and draft pressure. The methods used to measure pressure are broadly classified as :

1. Liquid column method where the height and density of the fluid determine the pressure

2. Use of pressure sensing elements like air pressure gauge, hydraulic pressure gauges or cylinder pressure gauge

3. By electronic method

Pressure Gauges

Pressure gauges are widely used in the anhydrous ammonia and LPG gas industry for measuring the pressure in closed containers. The different types of pressure gauges are:

• Diaphragm gauge

When pressure is applied on either side of the diaphragm, it gets deflected. The deflection is proportionate to the differential pressure. This is the basic principle of cylinder gauges.

The diaphragm can be of a metallic or non-metallic material. Metallic diaphragms are flexible discs, which may be flat or corrugated. The non metallic diaphragms are made from rubber Miles Sanders Game Jersey , neoprene, Teflon or nylon which is are highly bendable materials.

• Stainless steel gauge

This pressure gauge is used to measure pressure of fluids in petroleum, chemical, chemical fiber, power plants and metallurgy industry. The pressure gauge is designed for high accuracy and durability.

• Ammonia pressure gauge

This type of a gauge is used in the chemical fertilizer production or refrigeration equipment production Andre Dillard Game Jersey , which is used to measure the pressure of ammonia liquid, gas or for non crystallized mediums.

• Magnetic electric contact pressure gauge

This kind of pressure gauge is used to measure pressure of liquid in machine oil, metallurgy or chemical industry, without the risk of explosion.

• Vibration proof pressure gauge

This type of pressure gauge is widely used to measure pressure of gas or liquids of copper, its alloys Clayton Thorson Game Jersey , non crystallized and non explosive material.

• Stainless steel pressure gauge

A stainless steel diaphragm pressure gauge is widely used in boilers, ventilating devices and various gas applications that require high corrosion resistance.

Types of cylinder gauges

The types of cylinder gauges depend upon the different pressures it is calibrated to measure. The 2” gauges measure a range of pressures from 0 to 100 psig, 0 to 160 psig, 0 to 200 psig, 0 to 400 psig and 0 to 4000 psig. The applications of these gauges vary as per the industry they are used in.

The accessories that can be attached to dial pressure gauges are:

• Extension hose
• Bleeder valve
• Shock resistant dial cover
• Protective accessories like a shut off valve Shareef Miller Game Jersey , drain valve
• Pipe coils and siphons
• Pulsation dampeners or slubbers

Pressure gauge for LP Gas service and anhydrous ammonia service

The material used to manufacture pressure gauge for LP-gas is made of either steel or brass to measure pressures ranging from 30 psig to 300 psig.
A common gauge can be used to measure the pressure for anhydrous ammonia and LP gas is made from steel with a pressure range from 60 psig to 400 psig.
Pressure gauges have a wide application in almost every industry like the medical industry, the chemical industry and the machinery industry to list a few. Choosing a wrong gauge proves to be detrimental to the industry. Keep in mind the nature and characteristic of the components whose pressure has to be measured and choose the gauge components accordingly for the accuracy of measurement.

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Keywords: cylinder gauges, Pressure gauges, pressure gauge for LP-gas

By: Joe Cregan

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