ASTM F956-91(2012)

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

• Status: Historical
• Publication Date: 30-Apr-2012
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.07 - General Requirements

Relations

• Replaces: ASTM F956-91(2006) - Standard Specification for Bell, Cast, Sound Signalling
• Effective Date: 01-May-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F956 −91 (Reapproved 2012) An American National Standard
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 4.1.1 150 mm,
4.1.2 200 mm (2.2 kg),
1.1 This specification covers cast sound-signalling bells,
4.1.3 200 mm (4.5 kg),
together with bulkhead mounting plates for the smaller bells,
for use on ships, boats, and other marine craft, for compliance
4.1.4 250 mm,
with the rules in the convention on the International Regula-
4.1.5 300 mm,
tions for Preventing Collisions at Sea (commonly called
4.1.6 360 mm,
Colregs). See Appendix X1.
4.1.7 400 mm, and
1.2 Bells and bulkhead mounting plate shall be sized as
4.1.8 550 mm.
indicated in Section 4 (see Appendix X2).
4.2 Bulkhead mounting plates shall be furnished for the
1.3 For consistency with International Regulations, all mea-
following bell sizes:
surements are in SI units.
4.2.1 150 mm, and
4.2.2 200 mm.
2. Referenced Documents
2.1 ASTM Standards:
5. Ordering Information
B584 Specification for Copper Alloy Sand Castings for
5.1 Orders for materials under this specification shall in-
General Applications
2.2 Other Documents: clude the following information:
CFR 33 Part 81–72 Implementing Rules
5.1.1 ASTM designation and year of issue.
CFR 33 Part 86, Subpart B, Bell or Gong
5.1.2 Number of bells.
5.1.3 Size of bell(s) (see
4.1).
3. Terminology
5.1.4 Additional bulkhead mounting plates (see 4.2 and
3.1 Definitions:
6.2.2).
3.1.1 bell, n—a hollow metal instrument that rings when
5.1.5 Inscription required (see 12.1).
struck.
5.1.6 Packaging, if other than commercial (see Section13 ).
3.1.2 cast, v—to form by molding in a hollow form for
shaping a liquid or plastic substance.
6. Materials and Manufacture
3.1.3 clapper, n—hammer like object inside a bell.
6.1 Material:
4. Classification
6.1.1 Bell bodies, clappers, and other cast fittings and parts
shall be copper alloy conforming to Specification B584, UNS
4.1 Bells shall be furnished in the following sizes, based on
C87200.
bellmouth diameter in millimetres (see Appendix X2):
6.1.2 Fittings such as bolts, nuts, washers, pins, and sup-
porting lugs shall be of copper alloy compatible with the bell
This specification is under the jurisdiction of ASTM Committee F25 on Ships
castings.
and Marine Technology and is the direct responsibility of Subcommittee F25.07 on
General Requirements.
6.2 Manufacture:
Current edition approved May 1, 2012. Published May 2012. Originally
approved in 1986. Last previous edition approved in 2006 as F956 – 91 (2006). 6.2.1 ConstructionshallbeinaccordancewithFig.1,Fig.2,
DOI: 10.1520/F0956-91R12.
and Fig. 3.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
6.2.2 For Fig. 1 and Fig. 2, one bulkhead mounting plate
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
www.dodssp.daps.mil. shall be furnished with each bell, however, additional mount-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ing plates may be ordered.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.2.3 For all bells, two extra supporting nuts, washers, and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. acorn nuts (where used) shall be furnished.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F956−91 (2012)
Mass and Dimensions of Bells
Dimensions, mm
Bell Size, Bell Mass,
AB NOTE 1—All dimensions in millimetres.
mm kg
Tolerances:
150 1.4 150 105
Up to 125 mm: 62mm
200 2.2 200 133
Over 125 mm: 63mm
200 4.5 200 152
Mass of bell: 9 6 0.45 kg.
Mass of Clapper: 0.5 6 0.05 kg.
NOTE 1—All dimensions in millimetres.
FIG. 2Size 250
Tolerances:
Up to 150 mm: 62mm
Over 150 mm: 63mm
Mass of Bell: 60.2 kg (60.3 kg for 4.5 kg bell). 10.2 For orders for 3 to 10 bells of the same size, 2 bells
Mass of Clapper: No less than 3 % of bell mass.
shallbeselectedatrandom.Ifanyoneofthemfailstomeetthe
FIG. 1Sizes 150 and 200
requirements, then all bells in the order shall be inspected and
tested.
10.3 For orders for more than 10 bells of the same size.
They shall be separated into groups of 10 (or fraction thereof)
7. Acoustic Requirements
for sampling purposes.
7.1 Bells shall have full, clear, round, and far reaching
11. Inspection and Testing
tones.The sound pressure level shall not be less than 110 dB at
a distance of 1 m from it.
11.1 Responsibility—Unless otherwise specified in the
order, the manufacturer is responsible for the performance of
8. Dimensions, Mass, and Permissible Variations
all inspection requirements specified herein. The manufacturer
may utilize his own facilities or any commercial facilities
8.1 Dimensions and mass of bells, together with tolerances,
acceptable to the purchaser. The purchaser reserves the right to
shall conform to Fig. 1, Fig. 2, and Fig. 3.
perform any of the inspections set forth in this specification
where such inspections are deemed necessary to assure that
9. Workmanship, Finish, and Appearance
supplies conform to the prescribed requirements. Nonconform-
9.1 Bells shall be free of cracks, burrs, sharp cutting edges,
ing bells shall not be offered for delivery.
adhering sand, and other defects and blemishes affecting their
11.2 Inspections:
life, appearance, and serviceability.
11.2.1 The dimensions of the bell and appurtenances shall
9.2 Bell exteriors and the lower part of the interior, from the
be checked to ensure that they are within the specified
bellmouth to 10 mm above the line where the clapper strikes
tolerances.
the bell, shall have a smooth polished finish. The “visible” part
11.2.2 The bell, without bracket or mounting plate (for 150
of the clapper shall have a similar finish.
mm and 200 mm light), and clapper shall be weighed sepa-
rately to ensure that the mass is within the specified tolerance.
10. Sampling
11.2.3 For the 150 and 200 light sizes, the brackets shall be
10.1 For orders for 1 or 2 bells of the same size, each bell engaged and disengaged from each of the mounting plates to
shall be inspected and tested. ensure portability.
F956−91 (2012)
Dimensions of Bells, mm
Bell Size AB C D E F G H
300 300 270 50 65 25 208 310 M16 × 2
360 360 320 55 85 30 259 370 M20 × 2.5
400 400 350 60 100 30 291 405 M24 × 3
550 550 475 90 130 35 399 540 M24 × 3
Mass of Bells, kg
Bell Clapper
Bell Size
Mass Tolerance Mass Tolerance
300 14 ±0.70 0.60 0.04
360 27 ±1.35 0.95 0.07
400 34 ±1.7 1.35 0.09
550 90 ±3.6 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. 3Size 300 and Above
11.3 Acoustic Tests—Acoustic tests shall be conducted only 12. Product Marking
for the 200 mm heavy and larger bells to check the require-
12.1 Owner’s inscription shall be as specified. It shall be
ments of 7.1. Each bell tested shall be supported by the yoke or
applied either by being cast in relief (raised) or by engraving.
eyebolt with the clapper in place. The bell shall be rung by
Size and location shall be the same as U.S. shown in Fig. 1,
striking the bell with the clapper, activated by a lanyard.
Fig. 2, and Fig. 3.
11.3.1 The sound, produced in accordance with Appendix
12.1.1 For bells intended for use on ships, boats, and other
X1.1, shall be measured in a space with no large sound
watercraft of the U.S. Army and Navy and other government
reflecting surfaces (except the floor) that are within 10 m. The
sound shall be measured using a commercial sound level meter agencies, the inscription shall be U.S.; size and location shall
located at a distance of 1 m and at a height above the floor be as shown in Fig. 1, Fig. 2, and Fig. 3.
equal to that of the striking point.
F956−91 (2012)
12.2 The letters ASTM and this specification number shall afford protection
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