Chemical Engineering August 2023 - 36

ASTM
(Identical with ASTM Specification A178/A178M-95.)
a)
(Identical with ASTM Specification A182/A182M-18 except for the inclusion of
Grade F316Ti in para.7.3.1, and the removal of reduced strength levels for thicker
sections of Grade F53 in Table 3 and note G.)
b)
FIGURE 1. Shown here are the covers for SA-178/SA-178M (a), which indicates no change from the ASTM
version, and (b) for SA-182/SA-182M, which indicates a change from the ASTM version
* ASME NM-1 - Thermoplastic
Piping Systems
* ASME NM-2 - Glass Fiber
Reinforced Thermosetting Resin
Piping Systems
* ASME NM-3-1 - Nonmetallic
Materials Part 1 Thermoplastic
Materials Specs
* ASME NM-3-2 - Nonmetallic
Materials Part 2 Thermoset
Plastic Materials Specs
* ASME NM-3-3 - Nonmetallic
Materials Part 3 Properties
ASTM and ASME
In the process of selecting material
for pressurized equipment, there
may be some confusion surrounding
the issue of specification numbers
between ASTM and those
of ASME having a different prefix.
What I refer to is the prefix A attached
to ASTM specification numbers
and the same ASME material
specification numbers in the ASME
Boiler and Pressure Vessel Code
(BPVC) Section IIA for Ferrous Metals
having an SA prefix. Section IIB
for Nonferrous Material will have SB
as the prefix. Within the BPVC are
listed materials that comply with applications
used in the manufacture
of boilers and pressure vessels.
These listed materials are contained
in the ASME BPVC Sections II Materials,
as follows:
* Part A - Ferrous Material
Specifications (Beginning of
36
SA-450)
* Part B - Nonferrous Material
Specifications
* Part C - Specifications for
Welding Rods, Electrodes and
Filler Metals
* Part D - Properties (Customary)
*
Part D - Properties (Metric)
ASTM, in standardizing a material
specification, will provide all of
the essential elements based on a
material's chemistry, manufacturing
process, intended use, testing and
examination requirements. And in
many cases, a specification will be
broken down into multiple grades
and
classifications,
plus
various
supplemental qualifications.
ASME BPVC draws from the
ASTM pool of material specifications
and then qualifies,
or
vets
those specifications through testing
and theoretical analysis to qualify
the material for use under the requirements
of the BPVC. In doing
so, the vetted material specification
will retain the same ASTM number,
but ASME will add an " S " to
the ASTM prefix to designate the
adopted ASTM specification
as an ASME
qualified specification.
For example,
ASTM A182/A182M
would become ASME
SA182/SA182M under
the ASME BPVC. In
Symbol
A
B
C
NR
many cases the adoption of an
ASTM material specification will remain
the same, without change. But
in some cases, the ASME material
specification will be modified from
its original ASTM material specification
to meet the requirements of the
ASME BPVC. In the ASME version
of a material specification, it will be
explained on the cover page of a
material specification as to whether
or not a material specification was
altered in any way, as shown in Figures
1a and 1b.
Two things you may notice, besides
the indicated note and the
different specification numbers, is
that Figure 1a has the ASTM logo
included on the specification cover
page in which there is no change to
the specification. This specification
has been adopted by ASME as written
by ASTM. And it states so on
the cover sheet in posting that it is,
" Identical with ASTM Specification
A178/A178M-95. "
In Figure 1b, the ASTM logo is not
included on the cover page, due to
the fact that ASME has determined
that the specification required modification
in order to meet the requirements
of the BPVC. And it states so
on the cover sheet in posting that
it is, " Identical with ASTM Specification
A182/A182M-18 except for
the inclusion of Grade F316Ti in
paragraph 7.3.1, and the removal of
reduced strength levels for thicker
sections of Grade F53 in Table 3
and note G. "
With regard to piping, the materials
listed for use in piping applications
are listed in Appendix A-1 and
A-1M of the ASME B31.3 Process
Piping Code. In the listing of acceptable
materials under the piping
code, you will notice that the ASTM
material specification number is retained,
as in ASTM A182/A182M.
The materials listed in B31.3 have
been vetted by that committee
and approved for use as pressureTABLE
1. LEGEND OF CORROSION RATES
Corrosion rate, in./yr
<0.002
<0.020
<0.050
Corrosion rate, mm/yr
<0.05
<0.50
<1.27
>0.050 in./yr or explosive, not recommended
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