Meaning of safety valve model numbers
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There is a Crosby safety valve model 81SF48-6 at the outlet of the imported liquid oxygen pump. Could you please explain what this model number means?
81SF48-6 is the model number of the safety valve, with the following meaning: – 81: indicates that this safety valve meets the design requirements specified in Section VIII Division 1 of the ASME standards. - S: Indicates that the safety valve is a plug-in type safety valve. - F: Indicates that the safety valve features a spring-loaded design. - 48: Indicates that the diameter of this safety valve is 2 inches (48 millimeters). - 6: Indicates that the adjustable set pressure range for this safety valve is 250–500 psi. Therefore, the model 81SF48-6 indicates that this safety valve complies with ASME standards; it is a plug-in type, spring-loaded safety valve with a diameter of 2 inches, and its adjustable set pressure range is 250–500 psi. .
If he has a production license, then he has the reference table; if he doesn’t have a production license, it is not allowed to be used in the country.
After the marketization of safety valve calibration agencies, there are numerous illegal practices, the most common of which are as follows: 1. Fake reports； 2. No lead seal or the lead seal does not meet the requirements ； 3. No review of production licenses ； 4. Visual inspection failed ； 5. Verification of qualifications is not applicable. Basically, every testing agency commits more or less illegal acts; the entities that use such services cannot be exempted from liability just by signing an agreement – in fact, they bear considerable risks. The right approach is to choose legitimate testing agencies or those staffed by professionals. With the reform of these agencies and their transition toward a market-oriented system, the power of capital is significant, and the safety situation is not optimistic.
In safety valve calibration institutions, whether they are private enterprises or special inspection agencies, the following issue also exists: 1. Low educational level of the staff； 2. Insufficient training; they don’t even understand the relevant laws and regulations.