BS MA 47:1977
Current
The latest, up-to-date edition.
Code of practice for ships\' cargo blocks
Hardcopy , PDF
English
30-11-1977
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Foreword
Specification
1. Scope
2. References
3. Definitions
4. Factor of safety
5. Permissible working stresses
6. Materials
7. Side and partition plates
8. Fixed head fittings
9. Shanked swivel head fittings
10. Screw threads
11. Heat treatment
12. Axle pins
13. Lubrication
14. Sheaves
15. Becket
16. Locking nuts
17. Proof load
18. Examination after proof load
19. Marking
20. Certificate of test and examination
Appendices
A. Recommendations relating to contracts
B. Proof load in relation to safe working load
C. Single sheave blocks: marking of safe working load
and use in the derrick rig
D. Guidance for the ordering of blocks
E. Particulars of screw threads for the shanks of head
fittings
F. Care and maintenance of ships' cargo blocks
G. Formulae for round section eyes
H. Head fittings
Figures
1. Ships' cargo blocks
2. Shear pull-out and tensile stress in straps
3. Position of reactions in crossheads
4. Typical rigs using single sheave blocks
5. Head fittings
Tables
1. Load transmitted by block sheaves
2. Load on supporting straps (equal spans)
3. Permissible tensile stress on shanks of head fittings
4. Diameter in sheave grooves
5. Diameter of sheaves
6. Proof load in relation to safe working load
7. Typical table of information that may be supplied
with an enquiry or order
8. Particulars of screw threads: ISO metric screw
threads, coarse series with graded pitches
Steel blocks for use with wire rope in ships\' cargo derrick rigs. Design, construction and materials, safe working load, proof load, inspection, tests and certification. Recommendations for care and maintenance.
| Committee |
MHE/3/-/6
|
| DevelopmentNote |
Supersedes 72/34747 DC and BS 408(1963) (08/2005) Reviewed and confirmed by BSI, December 2012. (11/2012)
|
| DocumentType |
Standard
|
| Pages |
22
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This standard covers ships’ steel cargo blocks for use with wire rope and forming part of the cargo derrick rig, embracing the body, sheave(s), axle pin, head fittings and becket.
Materials, workmanship, design particulars (screw threads, bearings, sheave diameters for given rope sizes, sheave grooves), permissible stresses, proof loading, inspection, marking and certificate of test and examination are specified.
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| BS 919-3:1968 | Specification for screw gauge limits and tolerances Gauges for ISO metric screw threads |
| BS 310:1972 | Specification for blackheart malleable iron castings |
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| BS 970-1(1972) : 1972 | |
| BS 919-1:1960 | Specification for screw gauge limits and tolerances Gauges for screw threads of Unified form |
| BS 302:1968 | Specification for wire ropes for cranes, excavators and general engineering purposes |
| BS 1486-2:1961 | Lubricating nipples Heavy duty lubricating nipples |
| BS 3810-6:1973 | Glossary of terms used in materials handling Terms used in connection with pulley blocks |
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| BS 1700(1963) : LATEST | MEMORANDUM ON SHIPS' DERRICK RIGS |
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| BS 3017:1958 | Specification for mild steel forged ramshorn hooks |
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