Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
(OP)
Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure require an R-stamp?
We have a steam drum atop our #2 boiler the is leaking during the hydro. There is some corrosion on the closure that is causing it to get an inadequate seal.
The company that will be machiining the surface says that as long as they do not need to do any welding, there is no need for an R-Stamp.
I disagree. The NBIC states a Repair as: "The work necessary to restore pressure-retaining items to a safe and satisfactory operating condition.".
And a Mechanical Repair Method as: "A method of repair, which restores a pressure retaining boundary to a safe and satisfactory operating condition, where the pressure retaining boundary is established by a method other than welding or brazing, as defined under the rules of the NBIC.".
We have a steam drum atop our #2 boiler the is leaking during the hydro. There is some corrosion on the closure that is causing it to get an inadequate seal.
The company that will be machiining the surface says that as long as they do not need to do any welding, there is no need for an R-Stamp.
I disagree. The NBIC states a Repair as: "The work necessary to restore pressure-retaining items to a safe and satisfactory operating condition.".
And a Mechanical Repair Method as: "A method of repair, which restores a pressure retaining boundary to a safe and satisfactory operating condition, where the pressure retaining boundary is established by a method other than welding or brazing, as defined under the rules of the NBIC.".





RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
You need to understand the real world here, as well as the "code world" that is trying to safeguard innocents and bystanders from catastrophic internal boiler pressures. The "code" cannot prevent all errors, but rather can only write down ("codify" literally) a few absolutes.
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
NOTE: unless PWHT will be required, replacing the M/W ring is typically cheaper than machineing an oval item, and leaving it with the necessary RA-125 to 250 'phonograph' finish after getting a clean-up of the defects.
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
RE: Does the machining of the gasket surface (without welding) of a 12x16 steam drum boiler closure
Other types of repairs which do not alter the mechanical properties but affect performance are matters between the repair organization and user to decide.