Reasons for gauge failure & How to overcome

In this post we will discuss reasons for gauge  failure  (Pressure gauge failure) and how to overcome these failures.

 Two common reasons for gauge failure are

pipe vibration

high temperature

How to overcome these failures

by glycerin filled gauges (FOR PIPE VIBRATION AND HUMIDITY ENVIRONMENT)

The primary reason for gauge failure is vibration. Vibration has a negative impact on gauge accuracy in two ways.

First, it is difficult to accurately read a pointer on a dial when a gauge is vibrating.

Second, incremental damage to the pointer mechanism from vibration can eventually move a pointer off zero, producing an inaccurate reading.

In  dry gauges, delicate links, pivots, and pinions are prone to damage from vibration, leads to inconsistent performance. In a liquid-filled gauge, the fluid fill effectively dampens system pulsation, making the gauge pointer easier to read. Glycerin is filled to reduce the pipe vibrations. Glycerin is used in pressure gauge to damping the effect of vibration and pulsation.

Reasons for gauge failure
Reasons for gauge failure

Why glycerin Filled?

Glycerin-filled pressure gauges offer a number of advantages over traditional (without Liquid Filled)

  • In traditional gauges, condensation build-up results in visibility issues. In Dry Gauges it is difficult to read Gauge in Humidity Environment. This can be a crucial and costly  in high-humidity environments—an unreadable gauge is a worthless gauge. A solution to the impact of high humidity situations, liquid-filled gauges are designed to prevent moisture from entering not only the body casing but also the inside of the case lens.
  • Liquid-filled gauges have longer lives than traditional gauges because of their viscous fluid filling. Over time, this design advantage results in costs savings due to lowered instrumentation costs as well as lessened unscheduled downtime.
  • Internal liquids protect against severe temperature fluctuations and vibrations—major factors in the breakdown of regular gauges. Because they dampen temperature spikes and vibrations, liquid-filled gauges are easier to read, allowing for greater accuracy and process control.
  • Because they are sealed and constructed to meet rugged specifications, liquid-filled gauges are commonly used in chemical processes or in manufacturing or refining processes, and where products must be transported, stored, or handled in extreme temperature conditions.

BY USING siphons (FOR HIGH TEMPERATURE & RAPID PRESSURE CHANGES)

A pressure gauge siphon is a simple device used to protect a pressure sensor from high-temperature media, such as steam. It can also be used to reduce the potentially damaging effects of rapid pressure changes.

Reasons for gauge failure
Reasons for gauge failure

The pressure medium forms a condensate and is collected inside the coil or pigtail portion of the siphon. The condensate prevents the hot media from coming in direct contact with the pressure instrument. When the siphon is first installed, it should be filled with water or any other suitable separating liquid.


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