Do pressure vessels require maintenance when not in use?

1. Keep the pressure vessel dry and clean to prevent the air from corroding the vessel. Scientists have confirmed that dry air generally does not corrode ferroalloys such as carbon steel, and only begins to corrode when it is humid (relative humidity over 60%) and there is dust, dirt or old corrosion products on the metal surface . Therefore, in order to reduce the atmospheric corrosion on the outer surface of the out-of-service pressure vessel, the surface of the vessel should be kept clean, and the dust, ash and other dirt on the outer surface of the pressure vessel should be scrubbed frequently to keep the pressure vessel and the surrounding environment dry.

2. Paint the outer wall of the pressure vessel to prevent air corrosion. Attention should also be paid to the anticorrosion under the heat insulation layer and the pressure vessel support.

3. The pressure gauge should be kept clean, and the glass on the dial must be bright and clear, so that the pressure reading indicated by the pointer can be clearly seen. If the pressure gauge (including the pressure pipe) is found to be faulty, it should be dealt with in time. If there is any doubt about the indicated value of the pressure gauge, it should be checked with the standard pressure gauge in time. If there is an error, it should be replaced in time. Calibrate the pressure gauge regularly, and the calibration period should not be less than 6 months. The pressure gauge after calibration should be affixed with a certificate of conformity and sealed with lead.

4. If the pressure gauge has any of the following situations, it should be stopped and replaced immediately: the pressure gauge with a limited nail, when there is no pressure, the pointer must not return to the position of the limited nail; the pressure gauge without a limited nail (limited refers to positive pressure gauge) , when there is no pressure, the value of the pointer from the zero position exceeds the allowable error of the pressure gauge; the glass of the pressure gauge dial is broken or the scale of the dial is unclear; the seal is damaged or the validity period of the calibration is exceeded, the spring tube in the gauge leaks or the pointer of the pressure gauge falls off ; Defects such as broken pressure gauge pointer or severe casing corrosion affect the indication of the pressure gauge.

5. Pressure vessels should generally be equipped with required safety devices according to their technological characteristics. There are many types of safety devices, such as safety valves and pressure gauges, which should be installed and arranged reasonably. In order to keep the safety device in good condition, accurate and reliable, and easy to use, the maintenance and maintenance of the safety device must be strengthened during the operation of the pressure vessel.

6. The accessories of the pressure vessel must be kept intact. Pressure vessels with incomplete connecting fasteners shall not be put into use. Many major explosion accidents in which the end caps of pressure vessels flew out were caused by damage to the end caps.

7. During the maintenance of the pressure vessel, due to inspection, cleaning and opening of the end cover, the number of bolts is large, and the operator often only installs part of the fastening bolts into the bolts. In the case of insufficient bolt loading and poor sealing performance, the operator often puts If the nut is too tight, the pre-tightening force of the bolt is too large, so that the bolt on the rear flange of the container is broken, causing an explosion accident in which the end cover flies out. Therefore, for the fastening of the bolts and other accessories of the pressure vessel, after each removal, it should be cleaned first, and then the appearance inspection should be carried out to check whether the bolts are qualified to ensure repeated use.