ASTM F956-91(2006)
(Specification)Standard Specification for Bell, Cast, Sound Signalling
Standard Specification for Bell, Cast, Sound Signalling
ABSTRACT
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. Bell bodies, clappers, and other cast fittings and parts shall be copper alloy. Fittings such as bolts, nuts, washers, pins, and supporting lugs shall be of copper alloy compatible with the bell castings. Bells shall have full, clear, round, and farreaching tones. The sound pressure level shall not be less than 110 dB at a distance of 1 m from it. Acoustic tests shall be conducted only for the 200 mm heavy and larger bells to check the requirements prescribed.
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
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation: F956 – 91 (Reapproved 2006)
Standard Specification for
Bell, Cast, Sound Signalling
ThisstandardisissuedunderthefixeddesignationF956;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.2 200 mm (2.2 kg),
4.1.3 200 mm (4.5 kg),
1.1 This specification covers cast sound-signalling bells,
4.1.4 250 mm,
together with bulkhead mounting plates for the smaller bells,
4.1.5 300 mm,
for use on ships, boats, and other marine craft, for compliance
4.1.6 360 mm,
with the rules in the convention on the International Regula-
4.1.7 400 mm, and
tions for Preventing Collisions at Sea (commonly called
4.1.8 550 mm.
Colregs). See Appendix X1.
4.2 Bulkhead mounting plates shall be furnished for the
1.2 Bells and bulkhead mounting plate shall be sized as
following bell sizes:
indicated in Section 4 (see Appendix X2).
4.2.1 150 mm, and
1.3 For consistency with International Regulations, all mea-
4.2.2 200 mm.
surements are in SI units.
5. Ordering Information
2. Referenced Documents
5.1 Orders for materials under this specification shall in-
2.1 ASTM Standards:
clude the following information:
B584 Specification for Copper Alloy Sand Castings for
5.1.1 ASTM designation and year of issue.
General Applications
5.1.2 Number of bells.
2.2 Other Documents:
5.1.3 Size of bell(s) (see 4.1).
CFR 33 Part 81–72 Implementing Rules
5.1.4 Additional bulkhead mounting plates (see 4.2 and
CFR 33 Part 86, Subpart B, Bell or Gong
6.2.2).
3. Terminology 5.1.5 Inscription required (see 12.1).
5.1.6 Packaging, if other than commercial (see Section13 ).
3.1 Definitions:
3.1.1 bell, n—a hollow metal instrument that rings when
6. Materials and Manufacture
struck.
6.1 Material:
3.1.2 cast, v—to form by molding in a hollow form for
6.1.1 Bell bodies, clappers, and other cast fittings and parts
shaping a liquid or plastic substance.
shall be copper alloy conforming to Specification B584, UNS
3.1.3 clapper, n—the hammer like object inside a bell.
C8720.
4. Classification 6.1.2 Fittings such as bolts, nuts, washers, pins, and sup-
porting lugs shall be of copper alloy compatible with the bell
4.1 Bells shall be furnished in the following sizes, based on
castings.
bellmouth diameter in millimetres (see Appendix X2):
6.2 Manufacture:
4.1.1 150 mm,
6.2.1 ConstructionshallbeinaccordancewithFig.1,Fig.2,
and Fig. 3.
This specification is under the jurisdiction of ASTM Committee F25 on Ships
6.2.2 For Fig. 1 and Fig. 2, one bulkhead mounting plate
and Marine Technology and is the direct responsibility of Subcommittee F25.07 on
shall be furnished with each bell, however, additional mount-
General Requirements.
ing plates may be ordered.
Current edition approved Dec. 1, 2006. Published January 2007. Originally
approved in 1986. Last previous edition approved in 2001 as F956 – 91 (2001).
6.2.3 For all bells, two extra supporting nuts, washers, and
DOI: 10.1520/F0956-91R06.
acorn nuts (where used) shall be furnished.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
7. Acoustic Requirements
www.dodssp.daps.mil.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1 Bells shall have full, clear, round, and farreaching tones.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
The sound pressure level shall not be less than 110 dB at a
Standards volume information, refer to the standard’s Document Summary page on
distance of 1 m from it.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F956 – 91 (2006)
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
200 2.2 200 133 Mass of bell: 9 6 0.45 kg.
200 4.5 200 152
Mass of Clapper: 0.5 6 0.05 kg.
FIG. 2 Size 250
NOTE 1—All dimensions in millimetres.
Tolerances:
11. Inspection and Testing
Up to 150 mm: 62mm
Over 150 mm: 63mm
11.1 Responsibility—Unless otherwise specified in the or-
Mass of Bell: 60.2 kg (60.3 kg for 4.5 kg bell).
der, the manufacturer is responsible for the performance of all
Mass of Clapper: No less than 3 % of bell mass.
inspection requirements specified herein. The manufacturer
FIG. 1 Sizes 150 and 200
may utilize his own facilities or any commercial facilities
acceptable to the purchaser. The purchaser reserves the right to
8. Dimensions, Mass, and Permissible Variations
perform any of the inspections set forth in this specification
8.1 Dimensions and mass of bells, together with tolerances, where such inspections are deemed necessary to assure that
shall conform to Fig. 1, Fig. 2, and Fig. 3. supplies conform to the prescribed requirements. Nonconform-
ing bells shall not be offered for delivery.
9. Workmanship, Finish, and Appearance
11.2 Inspections:
9.1 Bells shall be free of cracks, burrs, sharp cutting edges, 11.2.1 The dimensions of the bell and appurtenances shall
adhering sand, and other defects and blemishes affecting their
be checked to ensure that they are within the specified
life, appearance, and serviceability. tolerances.
9.2 Bell exteriors and the lower part of the interior, from the 11.2.2 The bell, without bracket or mounting plate (for 150
bellmouth to 10 mm above the line where the clapper strikes mm and 200 mm light), and clapper shall be weighed sepa-
the bell, shall have a smooth polished finish. The “visible” part rately to ensure that the mass is within the specified tolerance.
of the clapper shall have a similar finish. 11.2.3 For the 150 and 200 light sizes, the brackets shall be
engaged and disengaged from each of the mounting plates to
10. Sampling
ensure portability.
10.1 For orders for 1 or 2 bells of the same size, each bell 11.3 Acoustic Tests—Acoustic tests shall be conducted only
shall be inspected and tested. for the 200 mm heavy and larger bells to check the require-
10.2 For orders for 3 to 10 bells of the same size, 2 bells ments of 7.1. Each bell tested shall be supported by the yoke or
shallbeselectedatrandom.Ifanyoneofthemfailstomeetthe eyebolt with the clapper in place. The bell shall be rung by
requirements, then all bells in the order shall be inspected and striking the bell with the clapper, activated by a lanyard.
tested. 11.3.1 The sound, produced in accordance with Appendix
10.3 For orders for more than 10 bells of the same size. X1.1, shall be measured in a space with no large sound
They shall be separated into groups of 10 (or fraction thereof) reflecting surfaces (except the floor) that are within 10 m. The
for sampling purposes. sound shall be measured using a commercial sound level meter
F956 – 91 (2006)
TABLE Continued
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
located at a distance of 1 m and at a height above the floor 12.2 The letters ASTM and this specification number shall
equal to that of the striking point. be engraved on the shank of each bell in figures at least 6 mm
high.
12. Product Marking
12.3 The manufacturer may engrave his brand name or logo
on the shank of the bell.
12.1 Owner’s inscription shall be as specified. It shall be
applied either by being cast in relief (raised) or by engraving.
13. Packaging and Package Marking
Size and location shall be the same as U.S. shown in Fig. 1,
Fig. 2, and Fig. 3. 13.1 No preservation is required.
12.1.1 For bells intended for use on ships
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