Steam drum issues

Are you asking about the operating pressure of the drum, or the set pressure of the safety valve on it? ? ? The steam drum should have parameters such as model and operating pressure. If it is a safety valve used for pressure control, the setting for the pressure at which the safety valve operates must be in accordance with the provisions of the \"Safety Regulations for Steam Boilers\". The set pressure for safety valves is determined based on the pressure gauge located on the boiler drum. When making adjustments, it is necessary to first adjust the safety valve with the highest opening pressure, and then proceed to adjust those with lower opening pressures in sequence. The adjustment methods vary depending on the type of safety valve. Here is a brief description of the adjustment methods for three commonly used types of safety valves: 1. Adjustment of weight-type safety valves: First, place the weight at the calculated position on the lever, then adjust the boiler’s combustion conditions so that when the steam pressure in the boiler reaches the pressure at which the safety valve is designed to operate, the valve will open automatically. Otherwise, adjust the position of the weight on the lever inward or outward until this requirement is met, and then fix the weight in that position. 2. Adjustment of spring-type safety valves: The adjustment method is basically the same as that for weight-type safety valves. That is, adjust the boiler combustion to raise the pressure to the pressure at which the safety valve operates. If the safety valve does not open or opens prematurely, the boiler pressure can be reduced, after which the spring compression nut should be adjusted (loosened if it does not open, tightened if it opens prematurely), until the safety valve opens within the range permitted by its operating pressure. 3. Adjustment of pulse safety valves: Pulse safety valves consist of a main safety valve (pendulum or spring-type) and a pulse valve. When the pulse valve operates, it controls the activation of the main safety valve; therefore, its method of adjustment is essentially the same as that of the first two types of safety valves. The difference is that the first two types of safety valves are used to adjust the main safety valve itself, whereas for pulse safety valves, only the pulse needs to be adjusted. shd163207 was posted on 2009-3-4 12:33