Pressure gauge is one of the main instruments and equipment of modern industrial production enterprises. It is an important measurement index tool for safe production and a reliable data base for safe production. Let's take a look at the causes of pressure gauge damage.
The measuring range of the pressure gauge is too large, resulting in low accuracy. Usually, the minimum value of the measured pressure is greater than 1/3 of the full scale of the pressure gauge. The upper limit of the watch is too small to cause overpressure and damage to the elastic parts of the watch, which were easily damaged in the past. Typically, the selected table value should be 1.5 times the working pressure.
When choosing the type of pressure gauge, the technical requirements of the production process are not fully considered, such as whether it is necessary to add functions such as alarm, automatic recording, and remote transmission of the pressure gauge of the department; special selection of pressure gauges in the fields of vibration, electromagnetic field, high temperature, and high temperature; Whether the selection of special pressure gauge is required to measure the physical and chemical properties such as corrosion, temperature, flammable and explosive function, pollution degree and viscosity of the medium.
The installation position of the pressure gauge is not easy to observe, or it is prone to collision and damage during operation and maintenance. The pressure gauge should be installed in a well-lit place, not easy to touch by mistake, and easy to maintain.
In addition, electrochemical corrosion is one of the environmental corrosion that cannot be ignored, and it can also be said to be a kind of corrosion, because the surface of chemical instruments is generally composed of metal, and the working environment of pressure gauges is relatively special, which often leads to the generalization of electrochemical reactions and the generation of electrochemical stimulation current, which leads to corrosion, mainly atmospheric corrosion caused by S02 and medium corrosion caused by long-term contact with acid and alkali.
Commonly used housing materials are black housing and stainless steel. The black housing is made of iron with a black anti-corrosion coating. It is recommended for indoor use and the price is more economical. Stainless steel material has the advantages of corrosion resistance, acid and alkali resistance, and can slow down the aging of sun and rain. It is suitable for outdoor installation.
Due to the properties and mechanical properties of stainless steel, it also has the characteristics of high load resistance. Pressure gauges enable this series of pressure gauges to meet the pressure measurement requirements of most petrochemical systems, but are not suitable for pressure measurement of working fluids that are prone to crystallization or solidification.
The oil-filled pressure gauge fills the pressure with glycerin as a buffer during operation. Its design feature is that it is suitable for the place where the hardware structure of the working system has vibration characteristics. The vibration of the system will cause excessive swing of the pointer. The high viscosity oil film tank pressure gauge in the pressure gauge has high damping characteristics, which can greatly reduce the wear of the internal gear and improve the service life.
The buffer tube, also known as the pressure gauge bending tube or serpentine tube, mainly has the functions of damping and shock absorption, and can also play a certain role in the heat dissipation of high temperature media, so as to protect the pressure gauge and reduce the temperature influence error of the pressure gauge.
Its main function is to protect the internal transmission mechanism of the medium from medium corrosion. Generally, the medium has a certain degree of corrosion and must be equipped with buffer pipe. The impact resistant pressure gauge must be equipped with buffer pipe when the medium temperature is greater than 60 ℃. The pressure gauge must be installed on the clean drinking water system without adding.