Steam pipes in sludge incineration plants
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For the steam or boiler feedwater pipes of the waste heat boilers and auxiliary boilers in sludge incineration plants, according to the scope classification diagram in GB/T 32270 \"Code for Power Piping\", should the portion that constitutes the pipes outside the boiler be subject to GB/T 32270 \"Code for Power Piping\" as well? Should the part classified as external piping not related to boilers comply with GB/T 20801 \"Industrial Piping – Specifications\"? In that case, these steam pipelines and boiler feedwater pipelines require the two design qualifications of GC2 and GCD. Generally, chemical engineering design firms do not possess the GCD qualification; so what should be done in such a situation? I would appreciate some guidance from experts, thank you!
Are the external pipes of boilers as specified in GB/T 32270 and the pipes within the boiler scope as defined in TSG G0001-2012 \"Regulations on the Safety Supervision of Boilers\" the same set of pipes? If so, should GB 50316 in the following passage in TSG G0001 be changed to GB/T 32270? I would appreciate some guidance from experts, thank you!
Not all pipes within the boiler range are governed by GB/T 32270. TSG G0001 makes it clear that boilers of Class B and below can apply GB 50316; this is because some boilers are not located within thermal power plants, and therefore the pipelines within these boilers fall under Class GC, allowing the use of GB 50316. If your boiler is rated at Class B or lower, and there is no associated steam turbine generator in the boiler room, then the boiler room is merely a boiler house rather than a thermal power plant, and can be classified as GC class.
Thank you; your explanation was very clear. It seems that there are indeed some differences between China and the United States in this regard. According to ASME B31.1, even for boilers in chemical plants that do not generate electricity, the pipes within the boiler system should still be designed in accordance with ASME B31.1, right? There is another issue: even if the pipes within the boiler scope of Class B boilers are designed in accordance with GB 50316, the qualification requirements for such pipes should apply to those specified for boiler design, rather than those for GC industrial pipes, as they fall under the regulations governing boilers. Please advise; thank you!
Your description is a bit incorrect; the design qualifications for boilers are generally held by boiler manufacturers, and the pipes involved are those part of the boiler itself, which are usually supplied by the boiler manufacturer. Pipes within the boiler area generally refer to the pipes involved in the boiler room; they are usually designed by design institutes, with the boiler manufacturer providing the main valves. Don’t always stick to American standards in your thinking; domestic regulations do not stipulate that pipes within the boiler system must be of type GCD, nor does the boiler regulation state anything such as that. GB 50316 is a standard for industrial pipelines and cannot be used in the design of GCD pipelines. That’s why the boiler standards state that boilers of Class B and below can use GB 50316 – it is intended for industrial boilers. If your boiler is rated at Class B or below, and the boiler room is classified as an industrial boiler room rather than a thermal power plant, then there’s no issue with GCD.
Okay, I finally understand. It seems you’re truly an expert in this area; your explanation was excellent. Indeed, I had mixed up the American standards with the national standards a bit
The definition of power pipelines within the country should apply to those within thermal power plants; there is no consensus as to whether pipelines outside thermal power plants should also be considered power pipelines