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CCS Design and technical requirements for marine anchor windlass
The following Design and technical requirements for marine anchor windlass are based on CCS standards:
1 The technical requirements for windlasses are given in Table 1.
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Table 1 |
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No. |
Items |
Technical requirements |
Basis of inspection |
Remarks |
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1 |
Inclination angle of the ship |
Heel ±15°, roll ±22.5° Trim ±5°, pitch ±7.5° |
1.2.1.1 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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2 |
Ambient temperature |
-25℃ ~ 45℃ |
1.2.1.2 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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3 |
Materials |
Pressure components are to be made of steel, no brittle material is allowed |
13.2.4 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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Materials containing asbestos are prohibited for brake band |
SOLAS Reg. II-1/3-5 |
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4 |
Driving type |
Driven by an independent prime mover, the normal work of thehydraulic windlass is not to be affected by other equipment connecting with its pipeline |
13.2.5.1 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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For ships with single anchor weightnot exceeding 250 kg, hand-operated windlass may be provided |
13.2.5.1 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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5 |
Working load |
Class A1 stud link chains: 37.5 d2(N) Class A2 stud link chains: 42.5 d2(N) Class A3 stud link chains: 47.5 d2(N) |
13.2.5.2 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Anchor casting depth(D) is to be less than 82.5m |
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Class A1 stud link chains: 37.5d2+ (D - 82.5) × 0.27 d2(N) Class A2 stud link chains: 42.5 d2+ (D - 82.5) × 0.27 d2(N) Class A1 stud link chains:47.5 d2+ (D - 82.5) × 0.27 d2(N) |
13.2.5.2 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Anchor casting depth(D) is to be more than 82.5m |
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Continued Table 1 |
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No. |
Items |
Technical requirements |
Basis of inspection |
Remarks |
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6 |
Overload pull |
Not to be less than 1.5 times the working load |
13.2.5.2 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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7 |
Nominal speed |
Not to be less than 9 m/min. |
13.2.6.3 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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8 |
Withstand load |
45% of breaking load of chain cables |
13.2.5.3 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Fitted with stopper |
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80% of breaking load of chain cables |
13.2.5.3 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Not fitted with stopper |
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9 |
Driving power |
Windlasses are to be capable ofworking continuously for 30 min under working load. |
13.2.5.2(1)of PART THREE of Classification of SeaCCS Rules for -going Steel Ships |
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Windlasses are to be capable ofworking at least for 2 min at reduced speed under overload pull |
13.2.5.2(2)of PART THREE of Classification of SeaCCS Rules for -going Steel Ships |
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Power-operated windlasses are to be reversible |
3.2.5.4 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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10 |
Chain cables |
Stud link chains of 3 strength grades |
Section 2, Chapter 10, PART ONE of CCS Rules for Materials and Welding |
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11 |
Cable lifters |
The cable lifter is to have at least 5 snugs and must be able to disengage with the driving device |
4.2.1 of ISO 4568 |
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Continued Table 1 |
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No. |
Items |
Technical requirements |
Basis of inspection |
Remarks |
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12 |
Warping ends |
The windlass may be designed with or without warping ends, which maybe fitted on the intermediate shaft or on the cable lifter shaft. The profileof warping ends is to be in compliance with the relevant standard |
4.3.1 of ISO 4568 |
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13 |
Clutches |
Clutches are to be installed between cable lifter and driving shaft. Power-operated clutches are to be capable of being disengaged manually and to have efficient locking devices |
13.2.5.5 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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14 |
Control braking device |
The brake is to be capable of holding a load on the chain cable of 1.5 times the working load of the windlass. Electromagnetic brakes are to have a hand release device |
4.6.1 of ISO 4568 2.6.4.1 of PART FOUR of CCS of Sea Rules for Classifica |
Electric windlass |
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The brake is to be capable of holding a load on the chain cable of at least 1.3 times the working load of the windlass |
4.6.1 of ISO 4568 |
Driving types other than electric type |
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15 |
Brakes |
Brakes are to be able to withstand a static pull of 45% of the breaking load of the cable or wire or a maximum static load of the cable. Parts bearing forces will not be permanently deformed and no slip will be found for the brakes |
13.2.5.6 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Fitted with stopper |
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Brakes are to be able to withstand a static pull of 80% of the breaking load of the cable or wire. Parts bearing forces will not be permanently deformed and no slip will be found for the brakes |
13.2.5.6 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
Not fitted with stopper |
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Continued Table 1 |
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No. |
Items |
Technical requirements |
Basis of inspection |
Remarks |
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16 |
Stoppers |
Chain cable stopper, if fitted, along with its attachments is to be designed to withstand, without any permanent deformation, 80% of the specified minimum breaking strength of the chain cable. |
3.2.5.7 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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17 |
Operating device |
The operating device which controlsweighing and casting of the anchor is to be able to return to braking or stop position automatically |
4.10 of ISO 4568 |
17 |
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18 |
Protection and prevention |
Prime movers and transmission gears are to be provided with means for prevention of excessive moment and impact |
13.2.5.8 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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Cable lifter and gearing are to be protected against excessive torque developed by the prime mover |
4.8.2 of ISO 4568 |
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The lowest protection level for electrical equipment on the exposed deck is IP56 |
4.11.1 of ISO 4568 |
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19 |
Hydraulic system |
Relevant requirements in Section 7 of Chapter 2 and Section 7 of Chapter 4 in PART THREE of CCS Rules for Classification of Sea-going Steel Ships are to be complied with |
13.2.5.10 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships |
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20 |
Securing of seating |
Relevant requirements in Section 2,Chapter 3, PART TWO of CCS Rules for Classification of Sea-going Steel Ships are to be complied with |
CCS Rules for Classification of Sea-going Steel Ships |
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21 |
Electrical control |
Relevant requirements in Section 4 of Chapter 3 of PART FOUR of CCS Rules for Classification of Sea-going Steel Ships are to be complied with |
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2 The stress of windlass parts must be less than the elasticity limit of the material used and comply with the following 3 conditions:
(1) Under the working load of 6.1.5, the stress of any torque transmitting component shall not exceed 40% of the yield limit of the material;
(2) when the prime mover acts with maximum set torque, the stress of the affected parts is not to exceed 95% of the yield limit of the material. When the prime mover is an electric motor, the maximum torque value should be based on the maximum pull-out torque in the motor torque-speed characteristic curve. When the prime mover is a hydraulic motor, the maximum torque value is based on the output torque of the hydraulic motor when the hydraulic system safety valve takes off the setting value. For other types of windlasses driven by the prime mover, the maximum output torque value in the torque output characteristics of the prime mover shall prevail.;
(3) with the action of the withstand load, the stress of the affected parts is not to exceed 95% of the yield limit of the material.
3 The strength of brakes is to comply with the following requirements:
(1) For band type brakes, the pull of tight side and loose side of the brake band are to be calculated according to the following Euler formula:
T = t · eμα
where: pull of tight side of the band: T = P × eμα/(eμα– 1)
pull of loose side of the band: t = P/(eμα– 1)
circular brake force: P = FsuptDL/D
where: Fsupt – withstand load;
DL —— working diameter of cable lifter;
D —— diameter of brake boss;
μ —— friction coefficient of brake band;
α —— brake band contact wrap angle;
e —— base of natural logarithm.
(2) The maximum specific pressure of the brake band is to be calculated according to the pull of the tight side of the band, and the result is to be less than the permissible specific pressure of the material of the brake band.
(3) For other types of brakes, the strength is to be checked by recognized calculation methods.
(4) The stress of parts under force such as steel brake band, tight side pin shaft, tight side pull rod, loose side pin shaft and brake screw is to comply with the requirements of 2.6.2(4) of this Chapter.
4 The strength of bolts securing the seating is to comply with the following requirements:
(1) The forces acting on the bolts and thrust plates securing the windlass to the deck are to be calculated.
(2) The axial forces and combined shear forces of the bolt group (or bolts) are to be calculated according to the formula given in 3.2.5.5 and 3.2.5.6 of PART TWO of CCS Rules for Classification of Sea-going Steel Ships.
(3) The safety factor corresponding to bolt strength is not to be less than 2.0.
