ASME B31.5 (Interpretations N° 5).pdf

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ASME
B31.5
INTERPRETATIONS NO.
5
Replies to Technical Inquiries
October
1,
1991,
Through
July
31,
1994
Interpretations
5-1
Through
5-5
It has been agreed to publish interpretations issued by the
B31
Committee concerning
B31.5
as part of the update serviceto the Code. The interpretations have been assigned numbers in
Edition or Addenda stated in the
chronological order.
An
interpretation applies tothethe
interpretation
or,
if
none is stated, to the Edition or Addenda
in
effect on the date of issuance
of
theinterpretation. Subsequent revisions tothe Code may
have superseded the reply.
These
interpretations are not part
of
the Code or its Addenda.
These replies are taken verbatim from the original letters, except for a few typographical and
editorial corrections made for the purpose of improved clarity. In some instances, a review of the
interpretation revealed a need for corrections of a technical nature. In these cases, a revised reply
bearing the original interpretation number with the suffi
R
is
presented. In the case where an
interpretation
is
corrected by Errata, the original interpretation number with the suffi
E
is used.
ASME procedures provide for reconsideration of these interpretations when
or
if additional
information is available which the inquirer believes might affectthe interpretation. Further,
persons
aggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee.
As
stated in the Statement ofPolicyin the Code documents, ASME does not “approve,” “certify,”
“rate,” or “endorse” any item, construction, proprietary device, or activity.
For detailed instructions on preparation of technical inquiries to the
B31
Committee, refer to
Appendix
B.
17
COPYRIGHT American Society of Mechanical Engineers
Licensed by Information Handling Services
831.5
interpretations
No.
5
Interpretation:
5-1
Subject:
Date Issued:
File:
527.4.2, Examination of Welds
June
8,
1992
B31-91-29
Question (1): Please clarifythe reference to the word “cracks.” Does this refer to surface and/
or
visual cracks?
Reply
(1):
Yes.
Question (2): Does this encompass cracks that are nonvisual, subsurface
Reply
(2):
No.
Question
(3):
Is
radiographictestingamethodused
in inspectingASME/ANSI B31.5 type
welding,
or
is
it
utilized for inspecting a more stringent welding procedure?
Reply
(3):
No,
B31.5 does not address radiographic testing. See Para. 536(a)(2)
Interpretation:
5-2
Subject: Branch
504.3.1, Connection
Sections
Date Issued:
March
1-92-5
B3
File:
2,
1993
1
Question (1): Can pipe branches largerthan
Y4
the nominal diameter
of
run pipe be welded to
a piping run as a branch connection without reinforcement?
Reply
(1):
Yes, when the requirements of paras. 504.3.1 and 527.4.6 are met.
Question
(2):
Can Class
300
couplings or half couplings, of a nominal size larger than
Y.,
the
nominal diameter of a run pipe, be welded to a piping run as a branch connection without rein-
forcement?
Reply (2): Yes, when supported with calculations per para.
504.3
Question (3): Can an integrally reinforced branch connection, of a nominal size larger than
the nominal diameter of a run pipe, be welded to a run pipe
as
a branch connection?
Reply (3): Yes, when the requirements in para. 504.3.1(e)(3) are met.
‘/4
19
COPYRIGHT American Society of Mechanical Engineers
Licensed by Information Handling Services
m
0759670
05q3875
O Y 9
5-3,5-4.
5-5
831.6
Interpretations
No.
5
Interpretation: 5-3
Subject:
Date Issued:
File:
Radiography
March
2, 1993
B31-92-56
evaluated whenusedonan
Question: To what specification should random radiography be
ammonia refrigeration piping system?
Reply:
As
specified in para.
527.4.2(d).
Interpretation:
5-4
Subject:
Date Issued:
File:
523.2.2(f)(4)
Material Exempted Impact
From
1993
May
19,
B31-93-05
Test
Question
(1):
What is the allowable stress for ferrous impact tested materials in a refrigerant
piping system for metal temperatures between
-20°F
and
-
150°F?
Reply
(1):
Materials meeting the requirements of para.
523.2.2,
Impact Tests, may be used to
the allowable stresses in Table
502.3.1
at temperatures not lower than the test specimens.
Question
(2):
What is the allowable stress for piping material meeting the requirements of
SA-
333
Grade
6
in a refrigerant piping systems with a metal temperature of
-76"F?
Reply
(2):
40%
of
allowable stresses in Table
502.3.1.
Interpretation:
5-5
Subject:
Date Issued:
File:
ASME
B31.5-1992
Edition, Para.
502.2.6
May
11,
1994
B31-94-30
Question: Does para.
502.2.6
permit welding to standards not permitted by para.
527.4.2(d)
Reply:
No.
20
COPYRIGHT American Society of Mechanical Engineers
Licensed by Information Handling Services

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