Home>ASTM Standards>ASTM F956-91(R2018) pdf free download

ASTM F956-91(R2018) pdf free download

ASTM F956-91(R2018) pdf free download.Standard Specification for Bell, Cast, Sound Signalling
1. 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 Regula- tions for Preventing Collisions at Sea (commonly called Colregs). 2 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 mea- surements are in SI units. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
10. Sampling
10.1 For orders for 1 or 2 bells of the same size, each bell shall be inspected and tested. 10.2 For orders for 3 to 10 bells of the same size, 2 bells shall be selected at random. Ifany one ofthem fails to meet the 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) for sampling purposes.
11. Inspection and Testing
11.1 Responsibility—Unless otherwise specified in the order, the manufacturer is responsible for the performance of all inspection requirements specified herein. The manufacturer may utilize his own facilities or any commercial facilities acceptable to the purchaser. The purchaser reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to assure that supplies conform to the prescribed requirements. Nonconform- ing bells shall not be offered for delivery. 11.2 Inspections: 11.2.1 The dimensions of the bell and appurtenances shall be checked to ensure that they are within the specified tolerances.11.2.2 The bell, without bracket or mounting plate (for 150 mm and 200 mm light), and clapper shall be weighed sepa- 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 engaged and disengaged from each of the mounting plates to ensure portability. 11.3 Acoustic Tests—Acoustic tests shall be conducted only for the 200 mm heavy and larger bells to check the require- ments of7.1. Each bell tested shall be supported by the yoke or eyebolt with the clapper in place. The bell shall be rung by striking the bell with the clapper, activated by a lanyard. 11.3.1 The sound, produced in accordance with Appendix X1.1, shall be measured in a space with no large sound reflecting surfaces (except the floor) that are within 10 m. The sound shall be measured using a commercial sound level meter located at a distance of 1 m and at a height above the floor equal to that of the striking point.

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