ASME Liaison Report (5-18-11)

Report
ASME Liaison Report
to
CRE
May 18, 2011
Urey R. Miller, P.E.
Post Construction Committee
Committee is debating certification program for
bolted joint assemblers
“The purpose of qualifying flanged joint
assemblers is to ensure that they are sufficiently
familiar with the specified tools, joint assembly
procedures, and bolt size ranges such that they
consistently achieve the specified Target Prestress
within the specified tolerance for the tools and
assembly procedure that are to be used.”
Post Construction Committee
“Assemblers should be qualified by instruction
and examination by a competent instructor for
each joint assembly procedure and bolt size range
to be employed.”
 ASME will certify instructor organizations who
will in turn certify assemblers
ASME staff will prepare and implement program
in the future.
ASME Boiler and Pressure Vessel Committee
• ASME Code Publication cycle has been revised
• The 2011 Addenda will be a full reprint of the
Code (not just the revised pages)
• There will be no addenda published in the
future
• The next Edition of the Codes will be
published in 2013
• Subsequent editions will be on a two year
cycle
ASME Boiler and Pressure Vessel Committee
Section VIII Div 1
• ASME Stamp is replaced by ASME Mark with
designator for appropriate section of ASME
Code
• Change made for copyright reasons
• Code Case will allow 18 month transition
period for phase out of name plates
Example of New
ASME Mark
UT in Lieu of RT
• Paragraph UW-51 revised to incorporate Code Case
2235 which allows UT in lieu of RT
• Will allow UT for material ½ inch and thicker
instead of full RT
• Incorporated into Div 1 by reference to Div 2 which
already had UT provisions
• Allows Manufacturer to apply UT without Code
Case
• Especially advantageous for thick refinery
equipment
UT in Lieu of RT (cont’d)
UW-51 RADIOGRAPHIC EXAMINATION OF WELDED
JOINTS
(a) All welded joints to be radiographed shall be examined in
accordance with Article 2 of Section V except as specified
below.
(1) A complete set of radiographs……
(2) A written radiographic……
(3) The requirements of T-274.2…….
(4) As an alternative to radiographic examination
requirements above, all welds in material 1/2 in. (13mm)
and greater in thickness may be examined using the
ultrasonic (UT) method per the requirements of paragraph
7.5.5 of Section VIII, Division 2.
Common Rules
• ASME wishes to minimize same technical
requirements in three different books
• Upkeep and maintenance takes more
resources
• Rules get “out-of-sync” with one another
• Task Team will study alternatives for future
Common Rules (cont’d)
• Revision to UW-51 represents one “common
rule” approach
• A Code Case is near approval that will allow
Section VIII Div 2 design rules to be used in
lieu of Division 1 (using Div 1 allowable stress)
• Significant Advantages of using Div 2:
– Formed heads
– Opening Reinforcement
– External pressure (incorporates CC 2286)
Electric Immersion Heater Support
Plates
• New mandatory Appendix 41 for the design of
electric immersion support plates in lieu of
UG-39 reinforcement rules
• Based on the principles of Part UHX for U-tube
heat exchangers
• Results in significant thickness reduction of
support plates
Plate and Frame Task Group
• ASME BPV VIII has endorsed formation of
Plate and Frame Heat Exchanger Task Group
• Will consider Code rules that are specific for
the Code construction of plate and frame heat
exchangers
• Requested and will be supported by the plate
and frame exchanger Manufacturers
Cr-Mo Code Case –Div 1
• Committee approved a Code Case for
determining allowable axial compressive
stress from 700F to 1000F for 2 ¼ Cr- 1 Mo
material
• Based on time dependent properties
• Current rules allow up to 900F
• Methodology to be applied to other materials
and temperatures
Work Group on Design by Analysis
• Responsible for Part 5 of Section VIII Div 2
(Design by Analysis)
• Stress analysis, fatigue, elevated temperature
• Work Group formed and have had initial
meeting
• Chaired by Ben Hantz (will maintain synergy
with API 579/ASME FFS-1)
Consideration of Weld Peaking –
Section VIII Div 2
• Division 2 has been revised to require design
consideration of weld joint peaking when the
vessel operates in the creep regime
• Div 2 already requires consideration of
peaking when fatigue analysis is required
• Revisions will be made that will also require
design consideration of joint alignment when
fatigue analysis is required or the vessel is
operated in the creep regime
The End
Questions?

similar documents