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Rec. 1-25 - CLN (SEPT 2004) No. 10
Equipment
1.
Anchoring equipment
1.1
Anchoring equipment for ships having EN below 205 to 50
(a)
The design of the anchoring equipment for ships having EN < 205 to 50 is that given in A1 for
ships having EN
205.
(b)
These requirements are applicable to ships operating in unrestricted service. Reductions of
equipment may be permitted for ships operating in restricted service.
1.1.1 Equipment number EN
The equipment of anchors and chain cables is to be as given in Table 1 and it is to be based on an
Equipment Number EN calculated in compliance with A1.2
Table 1
Equipment No. 10
(1982)
(Rev.1
Aug.1999)
(Corr. Dec.
2004)
(Rev.2 June
2005)
Stockless bower
Stud link chain cable
Stream wire
anchors
for bower anchors
or chain
Mass
Stockless
Min. dia.
per
stream
Total
Mild
Special
Breaking
E.N.
No.
anchor
anchor
length
steel
quality
Length strength
Gr. 1
Gr. 2 or 3
(kg)
(kg)
(m)
(mm)
(mm)
(m)
kN
1
2
3
4
5
6
7
8
9
5070
2
180
60
220
14
12.5
80
65 (64.7)
7090
2
240
80
220
16
14
85
75 (73.5)
90110
2
300
100
247.5
17.5
16
85
80 (81.4)
110130
2
360
120
247.5
19
17.5
90
90 (89.2)
130150
2
420
140
275
20.5
17.5
90
100 (98.1)
150175
2
480
165
275
22
19
90
110 (107.9)
175205
2
570
190
302.5
24
20.5
90
120 (117.7)
NOTE
: The stream anchor and stream wire or chain may not be condition of classification of the concerned Society
IACS Rec. 1984/Corr.2004/Rev.2 2005 No. 10
1.1.2
Anchors
1.1.2.1 Types of anchors
1.1.2.1.1 Ordinary anchors
(a)
The requirements under A1.4.1.1 are to be complied with.
(b)
The mass of the stocked anchor, when used, and that of stream anchor, excluding the stock, is
to be 80% of the mass required in Table 1 for stockless bower anchors and the mass of the stock is
to be 20%.
1.1.2.1.2 High holding power (HHP) anchors
The requirements under A1.4.1.2 are to be complied with.
1.1.2.1.3 Super high holding power (SHHP) anchors
The requirements under A1.4.1.3 are to be complied with.
1.1.2.2 Installation of the anchors on board
The bower anchors are to be connected to their chain cables and are to be ready for use. The stream
anchor is to be ready to be connected with its cable.
1.1.2.3 Proof testing of anchors
The requirements under A.1.4.3 are to be complied with.
Table 2 (Blank)
No. 10
cont'd IACS Rec. 1984/Corr.2004/Rev.2 2005 No. 10
Table 2 (Blank)
1.1.3
Chain cables and wire ropes for anchors
1.1.3.1 Chain cables
(a)
The anchors are to be associated with stud link chain cables of one of the grades under A1.5.2,
Table 3. For equipment number EN up to 90, as an alternative to stud link chain cables,
short link chain cables may be considered, for acceptance, by the concerned Society on the basis
of their design, strength and steel quality.
(b)
Wire ropes for anchors may be adopted in compliance with 1.1.3.3.1
1.1.3.2 Proof and breaking loads of stud link chain cables
(a)
The breaking loads BL and proof loads PL are to be in compliance with the requirements under
A1.5.3.
(b)
The test loads values, rounded off from the loads in (a) above, which are to be used for testing and
acceptance of chain cables are given in Table 4.
No. 10
cont'd IACS Rec. 1984/Corr.2004/Rev.2 2005 No. 10
Table 4
Test Load Values for Stud Link Chains
1.1.3.3 Wire ropes for anchors
1.1.3.3.1 In alternative to the stud link or short link chain cables under 1.1.3.1, wire ropes may be used
for:
(a)
both the bower anchors of ships below 30 m in length
(b)
one of the two bower anchors of ships between 30 m and 40 m in length
(c)
stream anchor as stipulated in Table 1.
1.1.3.3.2 The wire ropes under (a) and (b) above are to have:
(i) length equal to 1,5 times the corresponding tabular length of chain cable (col. 5 of Table 1)
(ii) strength equal to that of tabular chain cable of Grade 1.
A short length cable is to be fitted between the wire ropes and bower or stream anchor having a length of
12,5 m or the distance between anchor in stowed position and winch, whichever is less.
1.2
Installation of the chain cables on board (see Note)
1.2.1
Capacity and arrangement of anchor chains locker
(a) The chain locker is to be of capacity and depth adequate to provide an easy direct lead of the
cables through the chain pipes and a self-stowing of the cables. The chain locker is to be
provided with an internal division so that the port and starboard chain cables may be fully and
separately stowed.
(b) The chain locker boundaries and their access openings are to be watertight as necessary to
prevent accidental flooding of the chain locker from damaging essential auxiliaries or
equipment or affecting the proper operation of the vessel.
(c) Adequate drainage facilities of the chain locker are to be adopted.
No. 10
cont'd Chain
Grade 1
Grade 2
Grade 3
diameter
Proof load
Breaking load
Proof load
Breaking load
Proof load
Breaking load
mm
kN
kN
kN
kN
kN
kN
1
2
3
4
5
6
7
2a
2b*
3a
3b*
4a
4b*
5a
5b*
6a
6b*
7a
7b*
11
36
35.8
51
51.2
51
51.2
72
71.7
72
71.7
102 102.4
12.5
46
46.1
66
65.7
66
65.7
92
92.2
92
92.2
132
14
58
57.9
82
82.4
82
82.4
116
116
165
16
76
75.5
107
107
150
150
216
17.5
89
89.2
127
127
179
179
256
19
105
150
150
211
211
301
* The values of the columns 2b, 3b, 4b, 5b, 6b and 7b may be adopted in alternative to the correspondent values of the columns 2a,
3a, 4a, 5a, 6a and 7a.
IACS Rec. 1984/Corr.2004/Rev.2 2005 Minimum mass per
Minimum mass per
length of 27.5 m
length of 27.5 m
Chain
Diameter
With Dee
With Lugless
Chain
With Dee
With Lugless
Shackle
Shackle
Diameter
Shackle
Shackle
mm
kg
kg
mm
kg
kg
26
410
405
78
3640
3535
28
480
475
81
3940
3820
30
550
545
84
4240
4105
32
620
615
87
4555
4405
34
700
690
90
4870
4705
36
785
775
92
5085
4905
38
875
860
95
5405
5210
40
965
950
97
5630
5425
42
1055
1040
100
5970
5745
44
1150
1130
102
6210
5970
46
1260
1240
105
6580
6320
48
1370
1345
107
6845
6575
50
1485
1455
111
7380
7080
52
1605
1575
114
7795
7475
54
1725
1690
117
8220
7870
56
1850
1810
120
8650
8270
58
1985
1945
122
8960
8550
60
2125
2075
124
9275
8835
62
2275
2220
127
9740
9270
64
2430
2370
130
10210
9710
66
2590
2525
132
10540
10005
68
2755
2685
137
11320
10750
70
2925
2850
142
12110
11500
73
3185
3100
147
12950
12300
76
3460
3360
152
13890
13200
No. 10
No. 10
cont'd 1.2.2
Securing of the inboard ends of chain cables
(a) The inboard ends of the chain cables are to be secured to the structures by a fastening able to
withstand a force not less than 15% BL nor more than 30% BL (BL = breaking load of the
chain cable).
(b) The fastening is to be provided with a mean suitable to permit, in case of emergency, an easy
slipping of the chain cables to sea, operable from an accessible position outside the chain
locker.
NOTE
The statements under 1.2.1 and 1.2.2 may not be condition of classification of the concerned Society.
Table 3
Mass of stud link chain cables
IACS Rec. 1984/Corr.2004/Rev.2 2005 No. 10
1.3
Windlass design and testing
1.3.1 A windlass suitable for the size of chain cable and complying with the following criteria is to be
fitted to the ship.
1.3.2 The windlass unit prime mover is to be able to supply for at least 30 minutes a continuous duty
pull Zcont, corresponding to the grade of chain cables given by:
Zcont = 37.5 d
2
N (4.33 d
2
kgf) grade 1
42.5 d
2
N (4.33 d
2
kgf) grade 2
47.5 d
2
N (4.84 d
2
kgf) grade 3
where d = chain diameter (mm).
These figures were determined taking into account the following conditions:
(i)
wind force equal to 6 on Beaufort Scale, corresponding, approximately, to 14 m/sec;
(ii)
water current velocity 3 knots = 1,54 m/sec.
(iii)
anchorage depth 100 m;
using ordinary stockless anchor.
The windlass unit prime mover is to provide the necessary temporary overload capacity for breaking out
the anchor. The temporary overload capacity or "short term pull" should not be less than 1.5 the
continuous duty pull and should be provided for at least two minutes. The speed in this period can be
lower than nominal.
NOTE
(a)
The values of Zcont include the influences of buoyancy and hawse pipe efficiency which is
assumed to be 70 percent.
(b)
The anchor masses are assumed to be the masses, excluding tolerances, as given in Table 2 above
and in A1.4.3 Table 2. The chain masses are assumed, owing to the buoyancy, smaller than those
in Table 3 and as given by P = 0,0218 d
2
kg per meter length.
(c)
Only one anchor is assumed to be raised at a time.
1.3.3 Nominal speed of the chain cable when hoisting the anchor and cable can be a mean speed only
and this speed shall be not less than 0,15 m/sec. The speed is to be measured over two shots of chain
cable during the total trip; the trial should be commenced with 3 shots (82,5 m) of chain fully submerged.
1.3.4 The capacity of the windlass brake is to be sufficient for safe stopping of anchor and chain cable
when paying out the chain cable. If a chain stopper is not fitted, the windlass is to be able to withstand a
pull of 80% of the breaking load of the chain without any permanent deformation of the stressed