Boiler pressure vessel safety valve running inspection, repair
Boiler pressure vessel safety valve running testing requirements
1、 there are regular release steam (gas) test records, in accordance with the provisions of regular release steam (gas).
2、 When boiler pressure vessel safety valve is in normal operation, there should be no leakage.
3、 after safety valve repair, there is checking records, setting value is fit for the procedure requirements.
4、 exhaust holes of safety valve exhaust pipe muffler without clogging, water, forming water.
5、 the device of spring type safety valve prevents the free screw movement is intact, lever-type safety valve limit device is complete, impulse-type safety valve impulse tube insulation is intact, gas chamber safety valve gas supply is according with the requirements.
6、 there is no safety valve disconnection or any increasing starting seat pressure phenomenon.
Boiler pressure vessel safety valve repair, maintenance requirements
1、 found safety valve selection errors, should be timely replacement of the correct type of safety valve.
2、 safety valve core and seat sealing surface is not tight and can not be repaired, the valve should be replaced.
3、 safety valve core and seat sticks deadly or spring is serious rust and corrosive, safety valve should be replaced.
4、 safety valve body, valve core, valve seat are intact, the surface crack-free, and the sealing surface is repaired and qualified.
5、 stem, valve core without jam phenomenon.
6、 Spring type safety valve spring deformation is normal, no cracks; lever-type safety valve lever is intact, edge is crack-free, heavy hammer limit device is easy to adjust, solid fixed; air chamber safety valve without jam phenomenon.
7、 Safety valve exhaust pipe without overheating, the internal corrosion has been cleaned up, the hanger is forced normally.
8、 Traps pipe is smooth and fixed way is right.
9、 Checking safety valve starting seat pressure, back seat pressure, measuring take-off height, to meet the standard requirements of technical documents.
10、After boiler pressure vessel safety valve installation and maintenance, should check the starting seat pressure. With the electromagnetic force-assisted operating mechanism electromagnetic safety valve, in addition to mechanical or hydraulic device check, we must also do remote operation of electrical circuit testing and automatic loop pressure test following the operation of electrical devices.
11、 After checking boiler pressure vessel safety valve, its starting seat pressure, back seat pressure, disc opening height shall comply with requirements and recorded in the boiler pressure vessel file.
12、 safety valve in the verification process must be rigorous to prevent over-pressure safety protection measures, and carry out under the supervision of the implementation. When the safety valve is being checked, verification officer shall not leave the scene half-way.
