Download IACS Requirement for Mooring PDF

TitleIACS Requirement for Mooring
Tags Stress (Mechanics) Ships Anchor Yield (Engineering)
File Size182.3 KB
Total Pages21
Table of Contents
                            Home page
contents
A1 Equipment
A 1.1 Design of the anchoring equipment
A 1.2 Equipment number and anchoring equipment table
A 1.3 Anchoring equipment for special purpose ships
A 1.4 Anchors
A 1.5 Chain cables for bower anchors
A 1.6 Permissible Weardown of Stud Link Chain Cable for Bower Anchors
A2 Shipboard fittings and supporting hull structures associated with towing and mooring on conventional vessels
                        
Document Text Contents
Page 1

Requirements
concerning
MOORING, ANCHORING
AND TOWING

IACS Req. 2007

INTERNATIONAL ASSOCIATION OF CLASSIFICATION SOCIETIES

Page 2

Contents, Page 1

CONTENTS

A1 Equipment Rev. 5 June 2005

A1.1 Design of the anchoring equipment 1981

A1.2 Equipment number and anchoring equipment Table (for vessels of unrestricted service) 1999

A1.3 Anchoring equipment for special purpose ships (tugs and dredgers) Rev. 1994/Corr. 95

A1.4 Anchors Rev. 4 1999

A1.5 Chain cables for bower anchors Rev. 4 1999

A1.6 Permissible weardown of stud link chain cable for bower anchors 1992

A2 Shipboard fittings and supporting hull structures associated with towing and Rev.3 July 2007
mooring on conventional vessels

IACS Req. 2007

Page 10

A1.4.4, Table 2

IACS Req. 1987/Rev.5 2005

A1
cont’d

Table 2 Proof Load Tests for Anchors



Mass
of

anchor


kg

Proof
test
load


kN

Mass
of

anchor


kg

Proof
test
load


kN

Mass
of

anchor


kg

Proof
test
load


kN

Mass
of

anchor


kg

Proof
test
load


kN

50
55
60
65


70
75
80
90


100
120
140
160


180
200
225
250


275
300
325
350


375
400
425
450


475
500
550
600


650
700
750
800


850
900
950

1000


1050
1100
1150
1200

23.2
25.2
27.1
28.9


30.7
32.4
33.9
36.3


39.1
44.3
49.0
53.3


57.4
61.3
65.8
70.4


74.9
79.5
84.1
88.8


93.4
97.9
103
107


112
116
124
132


140
149
158
166


175
182
191
199


208
216
224
231

1250
1300
1350
1400


1450
1500
1600
1700


1800
1900
2000
2100


2200
2300
2400
2500


2600
2700
2800
2900


3000
3100
3200
3300


3400
3500
3600
3700


3800
3900
4000
4100


4200
4300
4400
4500


4600
4700
4800
4900

239
247
255
262


270
278
292
307


321
335
349
362


376
388
401
414


427
438
450
462


474
484
495
506


517
528
537
547


557
567
577
586


595
604
613
622


631
638
645
653

5000
5100
5200
5300


5400
5500
5600
5700


5800
5900
6000
6100


6200
6300
6400
6500


6600
6700
6800
6900


7000
7200
7400
7600


7800
8000
8200
8400


8600
8800
9000
9200


9400
9600
9800

10000


10500
11000
11500
12000

661
669
677
685


691
699
706
713


721
728
735
740


747
754
760
767


773
779
786
794


804
818
832
845


861
877
892
908


922
936
949
961


975
987
998
1010


1040
1070
1090
1110

12500
13000
13500
14000


14500
15000
15500
16000


16500
17000
17500
18000


18500
19000
19500
20000


21000
22000
23000
24000


25000
26000
27000
28000


29000
30000
31000
32000


34000
36000
38000
40000


42000
44000
46000
48000



1130
1160
1180
1210


1230
1260
1270
1300


1330
1360
1390
1410


1440
1470
1490
1520


1570
1620
1670
1720


1770
1800
1850
1900


1940
1990
2030
2070


2160
2250
2330
2410


2490
2570
2650
2730




Proof loads for intermediate mass are to be determined by linear interpolation.

Page 11

A1.4.3.3-A1.4.3.3.2

A1.4.3.3 Testing of SHHP Anchors

A1.4.3.3.1 Anchor Proof Test

The SHHP anchor is to be proof tested with the load required by Table 2 for an anchor mass equal to 2
times the actual mass of the SHHP anchor. The proof loading procedure and examination procedure for
SHHP anchors are to comply with those for ordinary anchors, A1.4.3.1 (iii).

A1.4.3.3.2 Anchor inspections and Additional Tests

After the proof load test, all SHHP anchors are to be surface inspected by the dye penetrant method or
by the magnetic particle method. All surfaces of cast steel anchors are to be surface inspected. The
surface inspections are to follow Guidelines for NDE of Hull and Machinery Steel Castings. All cast
steel anchors are to be examined by UT in way of areas where feeder heads and risers have been
removed and where weld repairs have been carried out. The UT inspections are to follow Guidelines for
NDE of Hull and Machinery Steel Castings. Welded steel anchors are to be inspected at the welds. At
sections of high load or at suspect areas, the Society may impose volumetric nondestructive
examination; e.g ultrasonic inspection, or radiographic inspection.

At the discretion of the Society, additional tests of the anchor may be required. These tests include the
hammering test and the drop test, and are usually applied to cast steel anchors.

A1
contÕd

IACS Req. 1987/Rev.5 2005

Gauge length
Gauge length

L

L
L

L L

L
2

1 3

3
3

1
2 3

Stocked Anchor Stockless Anchor

Page 20

A2

Page 5 of 6 IACS Req. 2004/Rev.3 2007

A2
(cont)

A 2.2.4. Shipboard fittings

The selection of shipboard fittings is to be made by the shipyard in accordance with an
Industry standard (e.g. ISO3913 Shipbuilding Welded Steel Bollards) accepted by the society.
When the shipboard fitting is not selected from an accepted Industry standard, the design
load used to assess its strength and its attachment to the ship is to be in accordance with A
2.2.3

A 2.2.5. Supporting hull structure

(1) Arrangement

Arrangement of the reinforced members (carling) beneath shipboard fittings is to consider any
variation of direction (horizontally and vertically) of the mooring forces (which is to be not less
than the Design Load as per A 2.2.3) acting through the arrangement of connection to the
shipboard fittings.

(2) Acting point of mooring force

The acting point of the mooring force on shipboard fittings is to be taken at the attachment
point of a mooring line or at a change in its direction.

(3) Allowable stresses

Allowable stresses under the design load conditions as specified in A2.2.3 are as follows:

Normal stress: 100% of the specified minimum yield point of the material;
Shearing stress: 60% of the specified minimum yield point of the material;

No stress concentration factors being taken into account. Normal stress is the sum of bending
stress and axial stress with the corresponding shearing stress acting perpendicular to the
normal stress.

A 2.2.6. Safe Working Load (SWL)

1) The SWL is not to exceed 80% of the design load per A 2.2.3.

2) The SWL of each shipboard fitting is to be marked (by weld bead or equivalent) on the
deck fittings used for mooring.

3) The above requirements on SWL apply for a single post basis (no more than one turn
of one cable).

4) The towing and mooring arrangements plan mentioned in A 2.3 is to define the
method of use of mooring lines.

A 2.3. Towing and mooring arrangements plan

1) The SWL for the intended use for each shipboard fitting is to be noted in the towing
and mooring arrangements plan available on board for the guidance of the Master.

2) Information provided on the plan is to include in respect of each shipboard fitting:

.1 location on the ship;

Page 21

A2

Page 6 of 6 IACS Req. 2004/Rev.3 2007

A2
(cont)

.2 fitting type;

.3 SWL;

.4 purpose (mooring/harbour towing/escort towing); and

.5 manner of applying towing or mooring line load including limiting fleet angles.

3) Where the arrangements and details of deck fittings and their supporting hull
structures are designed based on the mooring arrangements as permitted in Note 3 to
A 2.2.3.1, the following information is to be clearly indicated on the plan:

.1 the arrangement of mooring lines showing number of lines (N), together with

.2 the breaking strength of each mooring line (BS).

This information is to be incorporated into the pilot card in order to provide the pilot proper
information on harbour/escorting operations.

A 2.4. Corrosion Addition

The total corrosion addition, tc, in mm, for both sides of the hull supporting structure is not to
be less than the following values:

¥ Ships covered by CSR for bulk carriers and CSR for double hull oil tankers: Total
corrosion additions defined in these rules

¥ Other ships: 2.0

A 2.5. Survey After Construction

The condition of deck fittings, their pedestals, if any, and the hull structures in the vicinity of
the fittings are to be examined in accordance with the society’s Rules. The wastage
allowances as specified by the society’s Rules are not to exceed the corrosion addition as
specified in A2.4.

End
of
Doc.

Similer Documents