CCS Design and technical requirements for marine anchor windlass

time：2024-09-06 16:17:43

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.

Table 1
No.	Items	Technical requirements	Basis of inspection	Remarks
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
2	Ambient temperature	-25℃ ~ 45℃	1.2.1.2 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships
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
3	Materials	Materials containing asbestos are prohibited for brake band	SOLAS Reg. II-1/3-5
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
4	Driving type	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
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
5	Working load	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

Continued Table 1
No.	Items	Technical requirements	Basis of inspection	Remarks
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
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
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
8	Withstand load	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
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
		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
		Power-operated windlasses are to be reversible	3.2.5.4 of PART THREE of CCS Rules for Classification of Sea-going Steel Ships
10	Chain cables	Stud link chains of 3 strength grades	Section 2, Chapter 10, PART ONE of CCS Rules for Materials and Welding
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

Continued Table 1
No.	Items	Technical requirements	Basis of inspection	Remarks
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
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
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
14	Control braking device	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
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
15	Brakes	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

Continued Table 1
No.	Items	Technical requirements	Basis of inspection	Remarks
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
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
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
		Cable lifter and gearing are to be protected against excessive torque developed by the prime mover	4.8.2 of ISO 4568
		The lowest protection level for electrical equipment on the exposed deck is IP56	4.11.1 of ISO 4568
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
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
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

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 · e^μα

where: pull of tight side of the band: T = P × e^μα/(e^μα– 1)

pull of loose side of the band: t = P/(e^μα– 1)

circular brake force: P = FsuptDL/D

where: Fsupt – withstand load;

D_L —— 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.

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