I have a few questions about boilers
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1. If it involves major maintenance of a boiler, is it necessary for the original design firm to prepare new design documents? I heard that replacing main steam pipes with a diameter of 273 mm or more requires new design documents to be prepared. But what about other tasks that fall under major repairs – do they all also require the original design team to produce new design documents? Or can any entity with boiler design qualifications do it? 2. To increase the number of superheater tubes, does it require design documents prepared by the original design agency, or will documents prepared by any agency with boiler design qualifications suffice? According to the definition of renovation in the Boiler Safety Supervision Regulations, this doesn’t seem to fall under that category, but I think someone should be hired to design it. 3. Boiler Safety Technical Inspection Regulations 5.4.1.1(2): Replacing more than 50% of the entire set of heating surfaces; by “entire set,” does it refer to each component such as the economizer, superheater, and water wall as a separate unit?
Any contractor with the necessary construction qualifications can carry out the work. Construct according to the original drawing. But it must be reported to the boiler inspection agency
1. Renovation requires design documents prepared by qualified units; this is not necessary for major repairs. 2. Adding heating surfaces constitutes a change in the structure of pressure-bearing components, and should therefore be considered part of the renovation. 3. The entire set of heating surfaces is determined by the design drawings; if components such as economizers are designed as multiple sets, they should be calculated separately.
The boiler does not have a design qualification; instead, the company designs the boiler and then submits the drawings to the relevant authorities for approval.