"RT" Namplate Stamping
"RT" Namplate Stamping
(OP)
I have a 1968 "U" stamped pressure vessel not registered with the National Board. I do not have a U1 form.
The vessel's nameplate has the shell and head thickness stamped on it and using these as-fabricated values, it doesn't pass the code using joint eff of 0.85.
The Code Nameplate merely has "RT" stamped on it not RT-1, RT-2, RT-3, RT-4.
I don't know what the practice was back in 1968??? Does a stamping of "RT" on the nameplate mean Full, Spot, or User Specified???
The vessel's nameplate has the shell and head thickness stamped on it and using these as-fabricated values, it doesn't pass the code using joint eff of 0.85.
The Code Nameplate merely has "RT" stamped on it not RT-1, RT-2, RT-3, RT-4.
I don't know what the practice was back in 1968??? Does a stamping of "RT" on the nameplate mean Full, Spot, or User Specified???





RE: "RT" Namplate Stamping
RE: "RT" Namplate Stamping
RE: "RT" Namplate Stamping
I don't see how you could do very much without the material of construction.
Is there any thing like a serial number on any name plate. A lot of times there were 2 name plates on vessels. The second plate could have the manufacturers name and serial number on it
In the 1965 code 100% radiography was XR and partial was PXR.
RE: "RT" Namplate Stamping
The Code nameplate also lists the shell material/thickness (SA-515-70/0.9375, FQ) and head material/thickness (SA-515-70/0.4375, FQ).
I've always wondered what is the difference between Flange Quality steel and Pressure Vessel Quality??? Does anybody know. I don't think it's merely the grain size, that's provided in SA-515 and SA-516. Is it heat treatment??? Normalized vs Not-Normalized, What is it???
RE: "RT" Namplate Stamping
Pressure Vessel plates are only wrought form and may require specific melting practice and heat treatment (depending on thickness) practices.
RE: "RT" Namplate Stamping
Doesn't cast steel have a little more Si for pourability???
RE: "RT" Namplate Stamping
If a material is supplied in a cast form, this implies final shape with no working performed.
Both cast and wrought forms begin with proper melting practices during steel making. Wrought by no means implies an inferior product. Silicon is added to deoxidize the steel, and it does enhance fluidity during pouring.
RE: "RT" Namplate Stamping
RE: "RT" Namplate Stamping
I have numerous items made by my grandfather from wrought iron in the twenties and thirties.
http://www.realwroughtiron.com/wiac.asp