Definition of boiler over-temperature and over-pressure
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The boiler operation procedures state that boilers must not be operated at temperatures or pressures above the specified limits. But what exactly are these specified temperatures and pressures? Is there a clear definition? For example, if the operating temperature of the boiler superheater is currently 263 degrees, with a design temperature of 280 degrees, does exceeding the limit refer to not going above 263 degrees or 280 degrees? Also, what should the high alarm temperature for the boiler be set at?
It must not exceed the operating temperature, which is the maximum temperature limit; otherwise, it will affect the selection of the design temperature.
Is the high alarm temperature higher than the operating temperature or equal to it?
Although I don’t work with boilers, I think the alarm temperature should not exceed the maximum operating temperature, or there should be a set pressure similar to that of a safety valve. So, do you think accident prevention should take place before an incident occurs or after it? If the temperature is too high and it causes damage to the equipment, what’s the difference between triggering an alarm or not? Special situations require special treatment. In short, it should be accessory control instruments installed while ensuring the safe operation of the equipment.
Design temperature and pressure are specified values during the design phase; exceeding these values poses significant risks and may lead to accidents； The operating temperature/pressure is a value within the design range that meets all the requirements of the process and equipment; generally, upper limits and higher upper limits are established for this value. These upper limits are not fixed or predetermined, but in any case they must not exceed the design values
This post was last edited by mchb on 2018-11-16 at 16:30. So if the high temperature threshold for the boiler is set to this operating temperature, won’t the boiler remain in alarm mode all the time? Are there any guidelines specifying by how many degrees the alarm temperature should be higher than the operating temperature? Or is the temperature overreported to the design value?
The alarm temperature is between the operating temperature and the design temperature. The regulations only require that the operating temperature not exceed the design value; they do not specify exact values for triggering alarms, which are determined by the actual manufacturing process itself. Pressure is the same. Both over-temperature and over-pressure refer to the maximum operating pressure (i.e., the design pressure)
The so-called operation at excessive temperature and pressure is actually an internal regulation; the units that use boilers typically determine a maximum operating temperature and a maximum steam pressure based on their own requirements for steam usage. These two values serve as internal guidelines for such units. These restrictions have two implications: first, the manufacturing process of the company’s products does not permit the use of steam at higher temperatures and pressures, as this would affect product production； Secondly, excessive temperature and pressure can affect the safe operation of the boiler ； When considering this issue from the perspective of the boiler’s strength, it is essential that both temperature and pressure do not exceed the rated operating temperatures and pressures of each component of the boiler; this represents the minimum requirement. Typically, the limits set by the using entity are all below these values ；