ASTM B924-02
(Specification)Standard Specification for Seamless and Welded Nickel Alloy Condenser and Heat Exchanger Tubes With Integral Fins
Standard Specification for Seamless and Welded Nickel Alloy Condenser and Heat Exchanger Tubes With Integral Fins
SCOPE
1.1 This specification describes seamless and welded nickel alloy tubing on which the external or internal surface, or both, has been modified by a cold forming process to produce an integral enhanced surface, for improved heat transfer. The tubes are used in surface condensers, evaporators, heat exchangers and similar heat transfer apparatus in unfinned end diameters up to and including 1 in. (25.4 mm).
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following precautionary statement pertains to the test method portion only: Section 10 of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.
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Designation: B 924 – 02
Standard Specification for
Seamless and Welded Nickel Alloy Condenser and Heat
Exchanger Tubes With Integral Fins
This standard is issued under the fixed designation B 924; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Seamless Pipe and Tube
B 444 Specification for Nickel-Chromium-Molybdenum-
1.1 This specification describes seamless and welded
Columbium Alloy (UNS N06625) and Nickel-Chromium-
nickel alloy tubing on which the external or internal surface, or
Molybdenum-Silicon Alloy (UNS N06219) Pipe and
both, has been modified by a cold forming process to produce
Tube
an integral enhanced surface, for improved heat transfer. The
B 468 Specification forWelded UNS N08020, N08024, and
tubes are used in surface condensers, evaporators, heat ex-
N08026 Alloy Tubes
changers and similar heat transfer apparatus in unfinned end
B 515 Specification for Welded UNS N08120, UNS
diameters up to and including 1 in. (25.4 mm).
N08800, UNS N08810, and UNS N08811 Alloy Tubes
1.2 The values stated in inch-pound units are to be regarded
B 516 Specification for Welded Nickel-Chromium-Iron Al-
as the standard. The values given in parentheses are for
loy (UNS N06600, UNS N06603, UNS N06025, and UNS
information only.
N06045) Tubes
1.3 The following precautionary statement pertains to the
B 622 Specification for Seamless Nickel and Nickel-Cobalt
test method portion only: Section 10 of this specification. This
Alloy Pipe and Tube
standard does not purport to address all of the safety concerns,
B 626 Specification for Welded Nickel and Nickel-Cobalt
if any, associated with its use. It is the responsibility of the user
Alloy Tube
of this standard to establish appropriate safety and health
B 674 Specification for UNS N08904, UNS N08925, and
practices and determine the applicability of regulatory require-
UNS N08926 Welded Tube
ments prior to use.
B 676 Specification for UNS N08367 Welded Tube
2. Referenced Documents B 677 Specification for UNS N08904, UNS N08925, and
UNS N08926 Seamless Pipe and Tube
2.1 ASTM Standards:
B 690 Specification for Iron-Nickel-Chromium-
A 941 Terminology Relating to Steel, Stainless Steel, Re-
Molybdenum Alloys (UNS N08366 and UNS N08367)
lated Alloys, and Ferroalloys
Seamless Pipe and Tube
B 163 Specification for Seamless Nickel and Nickel Alloy
B 704 Specification for Welded UNS N06625, UNS
Condenser and Heat-Exchanger Tubes
N06219 and UNS N08825 Alloy Tubes
B 167 Specification for Nickel-Chromium-Iron Alloys
B 729 Specification for Seamless UNS N08020, UNS
(UNS N06600, N06601, N06603, N06690, N06693,
N08026, and UNS N08024 Nickel-Alloy Pipe and Tube
N06025, and N06045) and Nickel-Chromium-Cobalt-
B 751 Specification for General Requirements for Nickel
Molybdenum Alloy (UNS N06617) Seamless Pipe and
and Nickel Alloy Welded Tube
Tube
B 829 Specification for General Requirements for Nickel
B 407 Specification for Nickel-Iron-Chromium Alloy
and Nickel Alloys Seamless Pipe and Tube
Seamless Pipe and Tube
B 899 Terminology Relating to Non-ferrous Metals and
B 423 Specification for Nickel-Iron-Chromium-
Alloys
Molybdenum-Copper Alloy (UNS N08825 and N08221)
E 426 Practice for Electromagnetic (Eddy-Current) Exami-
nation of Seamless and Welded Tubular Products, Austen-
itic Stainless Steel and Similar Alloys
This specification is under the jurisdiction of ASTM Committee B02 on
E 571 Practice for Electromagnetic (Eddy-Current) Exami-
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys.
nation of Nickel and Nickel Alloy Tubular Products
Current edition approved Oct. 10, 2002. Published December 2002.
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
cation SB-924 in Section II of that Code.
Annual Book of ASTM Standards, Vol 01.01.
4 5
Annual Book of ASTM Standards, Vol 02.04. Annual Book of ASTM Standards, Vol 03.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B924–02
3. Terminology
3.1 For definition of general terms used in this specification,
refer to Terminologies A 941 and B 899.
3.2 Definitions of Terms Specific to this Document (Integral
Fin Tube Nomenclature):
D = outside diameter of unenhanced section
D = inside diameter of unenhanced section
i
d = root diameter of enhanced section outside of tube
r
d = outside diameter of enhanced section
o
d = inside diameter of enhanced section
i
FIG. 2 Outside and Inside Enhancement
W = wall thickness of unenhanced section
W = wall thickness of enhanced section
f
5.2 Welded material furnished under this specification shall
F = height of fin—enhanced section outside of tube
h
conform to the applicable requirements of Specification B 751,
F = mean fin thickness—enhanced section outside of tube
m
unless otherwise provided herein.
P = mean rib pitch—enhanced section inside of tube
5.3 Enhanced (integrally finned) sections of the tube shall
R = height of rib—enhanced section inside of tube
h
be produced by cold forming the tubing in such a manner that
H = rib helix angle—enhanced section inside of tube
a
exterior fins, wall under the fin and inside ribs (when specified)
T = transition taper
t
are homogeneous.
4. Ordering Information
5.4 Tubes described by this specification shall be furnished
4.1 It is the responsibility of the purchaser to specify all with unenhanced (plain) ends.
5.5 Enhanced sections of the tube are normally supplied in
requirements that are necessary for material ordered under this
specification. Such requirements may include, but are not the “as finned” temper (cold worked condition produced by the
enhancing operation). The unenhanced sections of the tube
limited to, the following:
4.1.1 ASTM designation and year of issue (this specifica- shall be in the annealed condition and shall be suitable for
rolling-in operations.
tion),
4.1.2 ASTM designation and year of issue (plain tube
6. Materials and Manufacture
specification),
6.1 The integrally enhanced (finned) tubes shall be manu-
4.1.3 Welded or seamless,
factured from seamless, welded, or welded/cold worked plain
4.1.4 Alloy grade and UNS designation,
tubes that conform to one of the following ASTM specifica-
4.1.5 Dimensions; plain tube outside diameter, plain tube
tions: B 163, B 167, B 407, B 423, B 444, B 468, B 515,
wall thickness (ave. or min. specified), length and location of
B 516, B 622, B 626, B 674, B 676, B 677, B 690, B 704, and
unenhancedsurfacesandthetotaltubelength.Configurationof
B 729.
enhanced surfaces (fins per unit length, fin height, wall
thickness under fin, rib pitch, rib height, etc.) shall be as agreed
7. Temper
upon between the manufacturer and purchaser. (Refer to Figs.
7.1 The tube after enhancing shall normally be supplied in
1 and 2).
the as-finned temper. When specified by the purchaser, for
4.1.6 Temper (as-finned or stress relief annealed),
bending, coiling or other fabricating operations, enhanced
4.1.7 Quantity,
portions of the tube may be stress relief annealed or solution
4.1.8 Packaging,
annealed.
4.1.9 Nondestructive tests,
7.2 Heat treatment of enhanced sections and bend areas, or
4.1.10 Customer inspection,
both, shall be in accordance with the governing plain tube
4.1.11 Mill test report, and
specification.
4.1.12 Certification.
5. General Requirements
8. Chemical Composition
5.1 Seamless material furnished under this specification
8.1 The tubing specified shall conform to the chemical
shall conform to the requirements of Specification B 829, requirements prescribed in the governing plain tube specifica-
unless otherwise provided herein.
tion.
9. Tensile Requirements
9.1 The tube prior to the finning operation, and unenhanced
portions of the finned tube, shall conform to the requirements
for tensile properties prescribed in the governing plain tube
specification.
10. Test Requirements
10.1 After enhancing operations, subject each tube to a
FIG. 1 Outside Enhancement Only nondestructive electromagnetic test, and either a pneumatic or
B924–02
hydrostatic test as specified in the purchase order. Tubes shall 10.1.3 Hydrostatic Test—When examined with this method,
normally be tested in the as-fabricated condition but, at the each tube shall be tested to an internal hydrostatic test pressure
option of the manufacturer or purchaser, may be tested in the of 1000 psi (6.9 MPa) provided that the fiber stress, calculated
stress relief annealed condition. in accordance with the following equation, does not exceed the
allowable fiber stress, S, indicated as follows:
10.1.1 Eddy Current Test—Eddy current inspect the tube in
accordance with Practice E 426 or E 571, by passing it through
P 5 2SW / d (1)
f r
an encircling coil designed to test the entire cross section of the
where:
tube.
P = hydrostatic test pressure, psi (MPa),
10.1.1.1 The reference standard used to adjust the sensitiv-
S = allowable fiber stress, for material in the condition
ity setting of the apparatus shall be sound and of the same
(temper) furnished as specified in the product speci-
nominal alloy, enhanced configuration, condition (temper) and
fication (S is calculated as the lower of ⁄3 of the
nominal dimensions as the lot of tubes to be tested on a
specified minimum 0.2 % offset yield strength or ⁄4
production basis. Drill four (4) holes not larger than 0.031 in.
of the specified minimum ultimate strength for the
(0.787 mm) in diameter radially through the enhanced wall in
material),
each of four successive planes at 0°, 90°, 180° and 270°. Use
W = minimum wall thickness under fin permitted, in.
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