Boiler pressure vessel safety valve commonly used debugging method
1、 Mechanical method to debug safety valve. Namely, increased media pressure direct take-off safety valve. It is easy to lead to medium waste, and the use of more than 6 to 8 years of boiler pressure vessel safety valve around the pipeline could easily lead to explosion and personal casualties. Therefore, to those boiler pressure vessel safety valve with longer using time, it is not recommend any mechanical method to debug. To new ones, we can adopt this method. but we should have the safe and protective measurements that can prevent safety valve over-pressure and without jump, and can reduce pressure.
2、 Hydraulic device debugging safety valve. Namely using hydraulic jacks and hydraulic piston device debugging safety valve. Generally under 75% ~ 80% of rated pressure. This method take-off pressure calculation formula: P0 = PS + P / k × tanQ
Symbol Description:
P0：Take-off pressure;
PS：Container medium pressure (Mpa);
P： Hydraulic jack oil pressure (Mpa);
K： Correction factor generally is 1.07
tanQ＝AS/AJ ； AS： Pressure-test valve pressure area（cm2）；AJ： Hydraulic jack pressure area（cm2），Manufacturers provide。
after hydraulic device debugging the safety valve, the minimum starting seat pressure safety valve is taken actual seat review, to confirm whether the value of take-off is accurated, if necessary, re-commissioning. At present, the power plant boilers and heating system pressure vessels safety valve mostly uses this method for the debugging, debugging results is ideal. It is proposed to promote this debugging method for application. It is noted that selecting regular manufacturer hydraulic debug device.
3、 Remove method debugging safety valve. The boiler pressure vessel safety valve is removed, and uses check equipment to check the valve separately. After checking qualified and then re-loaded safety valve. This approach uses the low-pressure boiler pressure vessel safety valve, with poor accuracy. For the boiler pressure vessel that can not be super-pressure in system, it is recommended to apply this method to debug safety valve.
4、 Once a year, on-line check boiler pressure vessel safety valves, commonly using hydraulic equipment to run under 75% ~ 80% of rated pressure.
