Does the steam distribution cylinder on the boiler require a separate safety valve?
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A specialist came for an inspection last time and mentioned this issue; the Special Inspection Institute replied that if the cylinder’s nameplate indicates it is a pressure vessel, then a separate safety valve needs to be installed. If it is an accessory manufactured for the boiler as indicated on the nameplate. There’s no need to install a safety valve anymore. Have any of you encountered a similar situation?
If there is no overpressure factor, then it is not necessary to install it
It’s hard to say about ten thousand things; what might happen is not certain! So it’s necessary to check the specifications!
1. These requirements are put forward by the supervision agencies. In fact, the report includes an item regarding cylinders, and inspections also cover boilers and similar devices; this has nothing to do with whether they are manufactured as containers. Following this logic, does water filled into such devices when they are manufactured as pressure vessels mean that they must be used as pressure vessels as well? This is completely contrary to the spirit of the law. 2. Whether a safety valve needs to be installed on the cylinder depends on the actual circumstances; if the pressure of the gas supply does not reach the designed operating pressure, then no such valve is necessary (the setting pressure of the boiler’s safety valve should not be higher than the requirements specified for the cylinder). Of course, it is also possible to install a safety valve as per the design requirements, although some designs do not include one at all.
That is, the design drawings already include interfaces for the safety valve. . I later consulted the Special Inspection Agency, and they replied that since the cylinder blocks are manufactured in accordance with pressure vessel standards, safety valves must be installed. Because you are currently being inspected along with the boiler, as an accessory to it. But if you are not an attachment to the boiler, you are outside the boiler room. It constitutes an independent pressure vessel. It must be installed. . Now the inspection is carried out together with the boiler. However, whether to install a safety valve or not still depends on the properties of the cylinder body itself. Manufactured in accordance with pressure vessel standards. It still needs to be installed. . This is the reply from the Special Inspection Agency; after all, safety valves aren’t that expensive. Just install it then, so as to avoid having to explain to him if it gets inspected. . This thing can’t be explained clearly. . There are so many checks now; it’s too troublesome
The cylinder heads are generally inspected together with the boiler, as specified in the technical standards. Some include the first cylinder in the scope of the boiler, but this also presents a problem: boilers with 2–3 cylinders are shipped as boiler accessories, which is troublesome. It is even better to use separate cylinders as containers; the first clause of the regulations regarding large-capacity safety valves states that \"(1) Pressure vessels within the scope of application of these regulations shall be equipped with overpressure relief devices in accordance with design requirements. When the pressure source is external to the pressure vessel and can be reliably controlled, the overpressure relief device does not need to be installed directly on the pressure vessel.\" ； ”
It complies with paragraph 9.2.1, clause 1 of the Fixed Volume Regulations; it is not necessary to install it directly on the equipment, and boiler steam drums fall within this category； If it doesn’t meet the requirements, just install it anyway.