+3 votes
444 views

ASME Section VIII Division 1 versus Division 2?

asked Apr 12, 2015 in Mechanical by NewtonTishle (505 points)
When to use ASME Section VIII Division 1 and when Division 2 is applied?

3 Answers

+2 votes
answered Apr 12, 2015 by jakangaru (2,010 points) | selected Apr 13, 2015 by odadmin
 
Best answer

Division 1:

  • Pressure typically up to 3000 psig.
  • Not much restrictions on materials; Impact Test required unless exempted.
  • Design Factor 3.5 on tensile (4 used previously) and other yield and temperature considerations.
  • NDE requirements may be exempted through increased design factor.
  • Professional Engineer Stamp is usually not required.
  • Hydrostatic Test of 1.3 design pressure  (1.5 was used before 1999 Addenda)
  • U Stamp

Division 2:

  • Pressure usually 600 psig and larger.
  • More restrictions on materials; Impact Test required.
  • Design Factor of 3 on tensile (lower factor under reviewed) and other yield and temperature considerations.
  • More stringent NDE requirements.
  • Professional Engineer Stamp is a must.
  • Hydrostatic Test of 1.25 design pressure
  • U2 Stamp
+3 votes
answered Apr 12, 2015 by Normandy (20,760 points)

Division 1 provides requirements applicable to the design, fabrication, inspection, testing, and certification of pressure vessels operating at either internal or external pressures exceeding 15 psig. Such vessels may be fired or unfired. This pressure may be obtained from an external source or by the application of heat from a direct or indirect source, or any combination thereof. Specific requirements apply to several classes of material used in pressure vessel construction, and also to fabrication methods such as welding, forging and brazing. Division 1 contains mandatory and non-mandatory appendices detailing supplementary design criteria, nondestructive examination and inspection acceptance standards. Rules pertaining to the use of the single ASME certification mark with the U, UM and UV designators are also included.

Division 2 provides requirements on materials, design, and nondestructive examination are more rigorous than in Division 1; however, higher design stress intensify values are permitted. These rules may also apply to human occupancy pressure vessels typically in the diving industry. Rules pertaining to the use of the single ASME certification mark with the U2 and UV designators are also included.

0 votes
answered Apr 16, 2015 by palagianomar (590 points)
Just an add on relating to Pressure Vessel design requirement, the Division 3 is applicable to pressure vessels operating at either internal or external pressures generally exceeding 10,000 psi. It does not establish maximum pressure limits for either Section VIII, Divisions 1 or 2, nor minimum pressure limits for this Division. Rules pertaining to the use of the single ASME certification mark with the U3 and UV3 designator are also included.

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