Safety valve calibration

Adjustment of the safety valve during load testing 1. The adjustment of the safety valve should be carried out under the supervision of qualified technical personnel in charge. 2. Before adjustment, strength and airtightness tests shall be conducted as specified. 3. The safety valve should generally be calibrated with nitrogen and sealed with lead before the unit’s load test run. 4. Safety valves that require a second calibration during the load testing of the unit must have undergone the first calibration using water pressure in accordance with relevant regulations ； In addition to the proper functioning of the unit unloading device, the manual unloading device of the safety valve must be flexible and reliable. 5. During the load testing phase, the safety valve is adjusted in one of the following ways: during the first adjustment, the opening pressure of the safety valve is set at roughly the highest operating pressure for that stage, so that final adjustments can be made as the pressure increases during load testing. During this process, the compressor must undergo overload testing ； Another method is to first use hydraulic pressure to adjust the opening pressure of the safety valve to the lowest pressure of that level or the rated operating pressure. During the load test, it is necessary to observe whether the valve opens at this set pressure, and make appropriate adjustments (during these adjustments, the opening pressure must always remain below the highest operating pressure of that level). By examining the relationship between the degree of adjustment of the safety valve and its opening pressure, the valve can be adjusted to fall within the specified range of opening pressures based on experience. After that, the safety valve is removed and verified once more using hydraulic pressure.

For the calibration of this safety valve, a correction notice will be issued as long as it is removed; if you don’t go along with their requirements, you’ll face a lot of trouble in the future:lol

Make a spare tank, shut down this tank, and then check the safety valve; this might be more cost-effective than shutting down the plant.

This issue is worth discussing: even without a valve installed in front of the safety valve, there are still such problems! It seems that **the developers and designers of standards should give more consideration to the issue (for equipment used with special media or in special processing applications, a primary valve should be installed before the safety valve); shouldn’t they also provide more convenience for users?** To address safety concerns, can supervision be strengthened? :$ However, I’m afraid this safety valve at the boring unit today will need to be calibrated on-site.