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ASME Section 8 Div 1 vs Div 2(5)

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 tothepoint (Mechanical) (OP) 12 Jul 03 6:56
 Can someone familiar with both Div 1 and Div 2 design rules please give me a short explanation of the intent/use of each of these?  i.e., when to use Div 1 rules and when to use Div 2 rules?  I'm not a pressure vessel designer, but work with vessels, and I hear refences to each of these and want to be more informed.  Thanks.
 (2)  prex (Structural) 12 Jul 03 10:48
 If you make an advanced search on this site by using Div.2 as the keyword you'll get a lot of stuff to read on the subject.In short: Div.1 provides simple design rules at the expense of a heavier vessel, Div.2 requires more detailed calculations, making the design cost more but allowing higher stresses, so that, for complex or large vessels, the overall cost will be lower. Both, as any standard, try to keep low the industrial costs for different classes of vessels, still maintaining an acceptable level of safety. prexhttp://www.xcalcs.comOnline tools for structural design
 Davis224 (Mechanical) 15 Jul 03 23:55
 prex's interpretation is correct. Also, be advised that Sec. VIII Div.1 is intended for pressures below 3000 psi; beyond that ' deviations from and additions to the rules apply' meaning compliance with Div. 2 is required.
 sgasociate (Mechanical) 16 Jul 03 13:21
 I think one of the most significant differences between Div 1 and Div 2 is Div 2 is used for cyrogenic vessels.
 SPLIT (Mechanical) 17 Jul 03 16:26
 Div 2 considers the calculations under fatigue conditions.Div 1 does not
 jte (Mechanical) 17 Jul 03 20:28
 Guys-Division 1 may be used for cryogenic vessels.Division 1 considers fatigue. See the previous threads where this was discussed in detail.jt
 ReMan (Mechanical) 4 Aug 03 8:43
 Regarding the comment made on use of VIII-2 for cryogenic vessels, please note that the toughness rules in VIII-1 & VIII-2 are identical. Further, VIII-1 contains rules in Part ULT which are specifically written for vessels in cryogenic service.RE: Fatigue Design - This is a great misconception regarding VIII-1 & VIII-2. Paragraph UG-22 in VIII-1 lists all loads that must be considered in design, including cyclic service. Just because VIII-1 does not does not provide mandatory rules for fatigue design does not mean that this loading condition can be ignored. Where mandatory rules do not exist, then U-2(g) applies.
 aclark (Mechanical) 6 Aug 03 8:42
 I think all of you are missing the most basic difference. The basic difference between section VIII Div 1 and Div 2, Div 3 is that Div 1 is a Code with design rules that are based on experience and Div 2 and 3 are based on design by analysis.In other words whe the Code was written it was well known that if you made a weld of a certian size it would give you satisfactory results. Also when Section VIII was origonaly written it had a safety factor of 5 it was lowered to 4 in the 1950's or 60's and was changed a few years ago to 3.5 and was given the term Design Margin.
 Hookem (Mechanical) 8 Aug 03 14:22
 Div. 2 are made for specific purpose, for specific location, and the vessel cannot be put into different service nor in different location without going through a recertification process.I have spreadsheet for ASME Sect. VIII, both Div. 1 and Div. 2 Calculations.  Perhaps I can share.......
 MarcoE (Mechanical) 8 Aug 03 16:30
 also, div 2 is for vessels 3,000 psi to 10,000 psi.  div 3 is for 10,000 psi and greater.
 jte (Mechanical) 8 Aug 03 17:16
 MarcoE-Division 2 is by no means limited to vessels over 3000 psi. There are many, many vessels built to Div. 2 which have "ordinary" design pressures. I was heavily involved with one a few years ago which had a design pressure of 200 psi at 300°F. Just take a look a AG-100(a): "... The rules of this Division, taken as a whole, provide an alternative to the minimum construction requirements for the design, fabrication, inspection, and certification of pressure vessels falling within the scope of Division 1." It is an *alternative* to every vessel within the scope of Div. 1. Design pressure does not play a role in its applicability.jt
 LSThill (Mechanical) 9 Aug 03 6:27
 China   Product Regulations Design Code Acceptable Foreign Design Codes Stationary pressure vessels Order No. 4, 5, 6, 7, 8, 9, 11, 19, 20 Provisions for the P.R.C on the Supervision and Control of Import and Export Boilers and Pressure Vessels (Reg 8)The Implementation Regulations of Import Beoiler and Pressure Vessel Safety Quality Licensing System.Order 23, 25 and 26 GB 150-89 Steel Pressure Vessels.GB 151-89 Heat ExchangersGB 12337-90 Spherical Steel Tanks None yet accepted.Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract Trans- portable pressure equipment Ordern No. 1, 3, 21 and 27) GB 5099-85 Seamless steel gas cylindersGB 5100-85 Welded Steel gas cylindersGB 5842-86 LPG cylinders None yet accepted.Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract Boilers Order No. 4, 5, 6, 7, 8, 9, 11, 19, 20 Provisions for the P.R.C on the Supervision and Control of Import and Export Boilers and Pressure Vessels (Reg 8)The Implementation Regulations of Import Beoiler and Pressure Vessel Safety Quality Licensing System. Strenght calculations standards for stationary shell boiler pressure parts or components.GB 9222-88 Strength calculation standards for stationary watertube boiler pressure parts or componentsGB 10180-88 Test Code for Industrial Boilers None yet accepted.Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract  Dear Mr. Thill,I am sorry it took so long to get back to you, but oursupplier for international standards had a rough timefinding anything. They were not able to find English translations of Codes,they did find these in Chinese: GB 6539    $129.00JB 4708$ 153.00JB 4732     $276.00GB 150$ 207.00JB 4744     \$ 102.00 These are not stock items at our suppliers, so I am sure itwould be at least 4-5 weeks before we could have them in Houston. If you are interested, perhaps we could find out more info.Regards,Beverly Mathews Brown Technical Book Shop        toll free 800-423-18251517 San Jacinto                 voice phone 713-652-1917Houston Texas 77002 USA          fax  713-652-1930  Check out our Shopping Cart..."Click and Go" !!www.brownbookshop.com
 Tankman650 (Structural) 10 Aug 03 0:41
 Calculations for Div 2 vessel must be certified by Registered Professional Engineer.  Div 1 does not have this requirement.
 juancito (Mechanical) 10 Aug 03 17:34
 Another difference between both divisions is the failure theory.Div. 1 uses max principal stress menwhile div.2 uses max shear stress (Tresca).

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