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Pressure gauge installation specification and maintenance guide

Author:    Source:    Date: 2021-05-26 16:15:08
Pressure gauge installation specification and maintenance guide The pressure gauge is one of the commonly used pressure gauges in industrial production. It has a wide range of uses. The accuracy of the pressure gauge is directly related to the success or failure of the installation to a large extent. In other words, it is so important. Huikeda instruments will be based on on-site experience

 1. Correct installation specifications

 1. For pressure gauges with water vapor or medium temperature exceeding 60°C, share the installation specifications and maintenance guidelines of the pressure gauge with you, and should be installed on site. In order to prevent overheating from damaging the instrument components, a ring or U-shaped elbow should be added between the pressure point and the pressure gauge valve. The valve installation position in this picture is different from that of part of the automatic control installation picture collection. The installation atlas is to install the valve at the root (red dot). Valves are prone to leakage and damage at high temperatures. When the valve is installed according to Figure 1, the valve will be in a normal temperature state, which greatly extends the service life of the valve, which has been proved by our many years of practice.

 2. When measuring the pulsating pressure at the outlet of the compressor or pump, in order to protect the pressure gauge and make the measurement accurate, a buffer or limiter can be installed in front of the pressure gauge; if necessary, a damping valve can be added to increase the resistance to the pressure gauge when the pressure changes.

When the measuring medium contains dust, particles or impurities, the pressure tube should be thickened. If necessary, install a dust collector or a drain valve to facilitate the purging of the pressure pipeline. moisture

 3 An oil-water separator should be installed, and the distance between the pressure gauge and the pressure point should be as short as possible. To avoid measurement lag, the maximum length of the pressure pipeline should not exceed 50 meters. If it is too long, you can use a remote pressure gauge. For the medium that is easy to crystallize and block up, movable joints should be installed to facilitate future disassembly and blockage; when installing low-pressure meters, try to avoid static pressure caused by liquid columns. For pressure measurement of key equipment, two pressure gauges can be installed separately to prevent accidents

 2. Error analysis of pressure gauge installation

The installation of the pressure gauge is not terrible. The scary thing is that we don't know what the problem is after the installation error? To be on the safe side, we have listed 7 error-prone installation errors:

 1. In the on-site skill training and installation operations, there are often errors that the threads are only divided into metric and imperial systems, which confuses the concepts of American and imperial threads. Actual GB/t7306.2&; mdash Company; 2000 "55&;; Sealed pipe thread Part 2: Tapered internal thread and tapered external thread thread specifications include 28, 19, 14 and 11 threads per inch, while GB /T 12716&; gas turbine; mdash company; 2011 "60&; degree; the number of threads per inch in "sealing pipe threads" includes 27, 18, 14, 11.5 and 8. It can be seen that if two threads have the same diameter, they can hardly be installed destructively. The original end face seal is changed to a linear seal, which greatly reduces the sealing ability. This situation often occurs in daily operations.

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