Skirt material for column

[MikeG7]

Is it permissible to use structural grade material for skirts for ASME VIII Div.1 equipment?
Quoting UG-4(b) Material for nonpressure parts, such as skirts, supports,
baffles, lugs, clips, and extended heat transfer surfaces,
need not conform to the specifications for the
material to which they are attached or to a material specification
permitted in this Division, but if attached to the
vessel by welding shall be of weldable quality [see
UW-5(b)]. The allowable stress values for material not
identified in accordance with UG-93 shall not exceed 80%
of the maximum allowable stress value permitted for similar
material in Subsection C.

The above suggest that non-ASME II material is permitted.
I am unsure exactly how one arrives at a "similar" material?

Our inspector is questioning the fact that structural grade materials which are not in ASME II do not have any published strength data beyond room temperature and hence are not acceptable materials.

Michael

 

[SnTMan]

MikeG7, nothing "wrong" with using "structural" materials in Sec VIII, Div 1 work. A number of so-called structural materials are listed in Sec II, Part D, probably the most familiar is SA-36. Nothing "wrong" with using non-listed material for non-pressure retaining components. Code tells you how. If you want to jump thru the hoops.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

I assume that you have the material test report of this non ASME material and marked with the manufacturer’s name and
identification in the plate.

Regards

 

[MikeG7]

Hi r6155 and SnTMan
Thanks for your repies.
"I assume that you have the material test report of this non ASME material and marked with the manufacturer’s name and identification in the plate." - Yes I have the material reports, this material is manufactured to EN 10025 and below is an extract only for reference:

Structural Steel Plate and Strip to EN 10025

General description
ArcelorMittal South Africa produces and markets hot rolled structural steel plate and coil to EN 10025 in
the following thickness ranges: Plate = 5mm - 100mm

Steel to EN 10025-2 is intended for structural work where no significant forming or bending must be
done. The steels described in this data sheet are intended for use in welded, bolted and riveted
structures for service at ambient temperatures.

The weldments should not be normalised but stress relieving after welding (PWHT) is permitted. Products delivered in the N condition may be hot formed and normalised after delivery. N condition refers to both normalising rolling and normalising.

The EN 10025 structural steel grades are all readily weldable by means of the usual metal arc processes.