ASTM F956-91(1996)
(Specification)Standard Specification for Bell, Cast, Sound Signalling
Standard Specification for Bell, Cast, Sound Signalling
SCOPE
1.1 This specification covers cast sound-signalling bells, together with bulkhead mounting plates for the smaller bells, for use on ships, boats, and other marine craft, for compliance with the rules in the convention on the International Regulations for Preventing Collisions at Sea (commonly called Colregs). See Appendix X1.
1.2 Bells and bulkhead mounting plate shall be sized as indicated in Section 4 (see Appendix X2).
1.3 For consistency with International Regulations, all measurements are in SI units.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: F 956 – 91 (Reapproved 1996) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Bell, Cast, Sound Signalling
This standard is issued under the fixed designation F 956; 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 4.1.8 550 mm.
4.2 Bulkhead mounting plates shall be furnished for the
1.1 This specification covers cast sound-signalling bells,
following bell sizes:
together with bulkhead mounting plates for the smaller bells,
4.2.1 150 mm, and
for use on ships, boats, and other marine craft, for compliance
4.2.2 200 mm.
with the rules in the convention on the International Regula-
tions for Preventing Collisions at Sea (commonly called
5. Ordering Information
Colregs). See Appendix X1.
5.1 Orders for materials under this specification shall in-
1.2 Bells and bulkhead mounting plate shall be sized as
clude the following information:
indicated in Section 4 (see Appendix X2).
5.1.1 ASTM designation and year of issue.
1.3 For consistency with International Regulations, all mea-
5.1.2 Number of bells.
surements are in SI units.
5.1.3 Size of bell(s) (see 4.1).
2. Referenced Documents 5.1.4 Additional bulkhead mounting plates (see 4.2 and
6.2.2).
2.1 ASTM Standards:
5.1.5 Inscription required (see 12.1).
B 584 Specification for Copper Alloy Sand Castings for
5.1.6 Packaging, if other than commercial (see Section13 ).
General Applications
2.2 Other Documents:
6. Materials and Manufacture
CFR 33 Part 81–72 Implementing Rules
2 6.1 Material:
CFR 33 Part 86, Subpart B, Bell or Gong
6.1.1 Bell bodies, clappers, and other cast fittings and parts
3. Terminology shall be copper alloy conforming to Specification B 584, UNS
C 87200.
3.1 Definitions:
6.1.2 Fittings such as bolts, nuts, washers, pins, and sup-
3.1.1 bell n—a hollow metal instrument that rings when
porting lugs shall be of copper alloy compatible with the bell
struck.
castings.
3.1.2 cast v—to form by molding in a hollow form for
6.2 Manufacture:
shaping a liquid or plastic substance.
6.2.1 Construction shall be in accordance with Fig. 1, Fig. 2,
3.1.3 clapper, n—the hammer like object inside a bell.
and Fig. 3.
4. Classification
6.2.2 For Fig. 1 and Fig. 2, one bulkhead mounting plate
shall be furnished with each bell, however, additional mount-
4.1 Bells shall be furnished in the following sizes, based on
ing plates may be ordered.
bellmouth diameter in millimetres (see Appendix X2):
6.2.3 For all bells, two extra supporting nuts, washers, and
4.1.1 150 mm,
acorn nuts (where used) shall be furnished.
4.1.2 200 mm (2.2 kg),
4.1.3 200 mm (4.5 kg),
7. Acoustic Requirements
4.1.4 250 mm,
7.1 Bells shall have full, clear, round, and farreaching tones.
4.1.5 300 mm,
The sound pressure level shall not be less than 110 dB at a
4.1.6 360 mm,
distance of 1 m from it.
4.1.7 400 mm, and
8. Dimensions, Mass, and Permissible Variations
This specification is under the jurisdiction of ASTM Committee F-25 on
8.1 Dimensions and mass of bells, together with tolerances,
Shipbuilding and is the direct responsibility of Subcommittee F25.07 on General
shall conform to Fig. 1, Fig. 2, and Fig. 3.
Requirements.
Current edition approved July 15, 1991. Published September 1991. Originally
published as F 956 – 86. Last previous edition F 956 – 87. 9. Workmanship, Finish, and Appearance
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
9.1 Bells shall be free of cracks, burrs, sharp cutting edges,
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
adhering sand, and other defects and blemishes affecting their
Annual Book of ASTM Standards, Vol 02.01.
F 956
Mass and Dimensions of Bells
Dimensions, mm
NOTE 1—All dimensions in millimetres.
Bell Size, Bell Mass,
Tolerances:
AB
mm kg
Up to 125 mm: 62mm
Over 125 mm: 63mm
150 1.4 150 105
Mass of bell: 9 6 0.45 kg.
200 2.2 200 133
Mass of Clapper: 0.5 6 0.05 kg.
200 4.5 200 152
FIG. 2 Size 250
NOTE 1—All dimensions in millimetres.
Tolerances:
Up to 150 mm: 62mm
perform any of the inspections set forth in this specification
Over 150 mm: 63mm
where such inspections are deemed necessary to assure that
Mass of Bell: 60.2 kg (60.3 kg for 4.5 kg bell).
supplies conform to the prescribed requirements. Nonconform-
Mass of Clapper: No less than 3 % of bell mass.
ing bells shall not be offered for delivery.
FIG. 1 Sizes 150 and 200
11.2 Inspections:
11.2.1 The dimensions of the bell and appurtenances shall
life, appearance, and serviceability.
be checked to ensure that they are within the specified
9.2 Bell exteriors and the lower part of the interior, from the
tolerances.
bellmouth to 10 mm above the line where the clapper strikes
11.2.2 The bell, without bracket or mounting plate (for 150
the bell, shall have a smooth polished finish. The “visible” part
mm and 200 mm light), and clapper shall be weighed sepa-
of the clapper shall have a similar finish.
rately to ensure that the mass is within the specified tolerance.
11.2.3 For the 150 and 200 light sizes, the brackets shall be
10. Sampling
engaged and disengaged from each of the mounting plates to
10.1 For orders for 1 or 2 bells of the same size, each bell ensure portability.
shall be inspected and tested.
11.3 Acoustic Tests—Acoustic tests shall be conducted only
10.2 For orders for 3 to 10 bells of the same size, 2 bells for the 200 mm heavy and larger bells to check the require-
shall be selected at random. If any one of them fails to meet the
ments of 7.1. Each bell tested shall be supported by the yoke or
requirements, then all bells in the order shall be inspected and eyebolt with the clapper in place. The bell shall be rung by
tested.
striking the bell with the clapper, activated by a lanyard.
10.3 For orders for more than 10 bells of the same size. 11.3.1 The sound, produced in accordance with Appendix
They shall be separated into groups of 10 (or fraction thereof)
X1.1, shall be measured in a space with no large sound
for sampling purposes. reflecting surfaces (except the floor) that are within 10 m. The
sound shall be measured using a commercial sound level meter
11. Inspection and Testing
located at a distance of 1 m and at a height above the floor
11.1 Responsibility—Unless otherwise specified in the or- equal to that of the striking point.
der, the manufacturer is responsible for the performance of all
12. Product Marking
inspection requirements specified herein. The manufacturer
may utilize his own facilities or any commercial facilities 12.1 Owner’s inscription shall be as specified. It shall be
acceptable to the purchaser. The purchaser reserves the right to applied either by being cast in relief (raised) or by engraving.
F 956
Dimensions of Bells, mm
Bell Size AB C D E F G H
300 300 270 50 65 25 208 310 M16 3 2
360 360 320 55 85 30 259 370 M20 3 2.5
400 400 350 60 100 30 291 405 M24 3 3
550 550 475 90 130 35 399 540 M24 3 3
Mass of Bells, kg
Bell Clapper
Bell Size
Mass Tolerance Mass Tolerance
300 14 60.70 0.60 0.04
360 27 61.35 0.95 0.07
400 34 61.7 1.35 0.09
550 90 63.6 3.40 0.18
NOTE 1—All dimensions in millimetres:
Tolerances:
Up to 125 mm: 62mm
125 to 250 mm: 63mm
250 to 375 mm: 65mm
375 to 500 mm: 66mm
Over 500 mm: 610 mm
FIG. 3 Size 300 and Above
Size and location shall be the same as U.S. shown in Fig. 1, 13.2 Unless otherwise specified, packing shall conform to
Fig. 2, and Fig. 3. manufacturer’s normal commercial practice, and in such a
12.1.1 For bells intended for use on ships, boats, and other manner that will ensure acceptance by common carrier and
watercraft of the U.S. Army and Navy and ot
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