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IS 15846 (2010): Anchors [TED 17: Shipbuilding]
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IS 15846: 2010
[Superseding IS 3267 : 1981, IS 3268 : 1981,
IS 3269 : 1981 and IS 3270 : 1966]
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—
Indian Standard
ANCHORS — SPECIFICATION
ICS 47.020.05
© BIS 2010
B U R E A U O F I N D I A N S T A N D A R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
March 2010 Price Group 9
Shipbuilding Sectional Committee, TED 17
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the finalized by the Shipbuilding
Sectional Committee had been approved by the Transport Engineering Division Council.
This standard supersedes the following Indian Standards:
IS No. Title
3267:1981 General requirements of anchors (first revision)
3268:1981 Specification for stockless anchors (for ship’s use) (first revision)
3269:1981 Specification for stock anchors (for ship’s use) (first revision)
3270:1966 Specification for stock and single fluke stock anchors (for harbour use)
The requirement of High Holding Anchors (HHP) has been included in this standard.
While formulating this standard considerable assistance have been derived from JIS F 3301:2000 ‘Anchors’.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS2:1960
‘Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off
value should be the same as that of the specified value in this standard.
IS 15846 : 2010
Indian Standard
ANCHORS — SPECIFICATION
1 SCOPE c) Stock anchor (Type A and B) (for ship and
harbour use) (see Fig. 3,Table 4 and Table 5);
This standard specifies anchors for ship and harbour
and
use (herein after referred to as ‘anchor’).
d) Single fluke stock anchor (Type A and B) (for
2 REFERENCES harbour use) (see Fig. 4 and Table 6).
The following standards contain provisions which 4.2 Normal Mass of Anchors
through reference in this text, constitute provisions of
The normal mass of anchors shall be as follows:
this standard. At the time of publication, the editions
indicated were valid. All standards are subject to a) Stockless anchors : Calculated gross mass.
revision and parties of agreements based on this
b) Stock anchors for ship use : Calculated mass
standard are encourages to investigate the possibility
excluding mass of stock.
of applying the most recent editions of the standards
c) Anchors for harbour use : Calculated gross
indicated below:
mass.
IS No. Title
4.3 Actual Mass of Stockless Anchors Excluding
2985:1990 Steel castings for ship’s structure —
Specification (third revision) Mass of Shank
3261:1980 Carbon steel forgings for It should preferably be 3/5 of the actual mass of
shipbuilding industry (first revision) anchors, actual mass of stock of stock anchor, ¼ of
actual mass of anchor excluding shank and actual mass
3 CLASSIFICATION
of stock of single fluke stock anchor, ¼ of actual gross
The anchors are classified according to their shapes as mass.
follows:
5 PERMISSIBLE DEVIATIONS
a) Stockless anchor, Type A (for ship use);
5.1 The dimensional tolerance on each part of anchor
b) HHP stockless anchor, Type B (for ship use);
shall be ± 4 percent and its maximum value shall be
c) Stock anchor, Type A (for ship and harbour
within ±20 mm. The length of shank of stockless
use);
anchor, may be modified in an unavoidable case
d) Stock anchor, Type B (for ship and harbour depending on the hawse pipe length.
use);
5.2 The masses of individual anchors shall not vary by
e) Single fluke stock anchor, Type A (for harbour
±7 percent of the tabular masses, provided that the total
use); and
mass of the anchors is not less than that would have
f) Single fluke stock anchor, Type B (for harbour
been required for anchors of equal masses.
use).
5.3 The swing angles of stockless anchors, Type A,
NOTE — Stockless anchors, Type B (for ship use) may be
shall be within 39º to 42º and designated by the
regarded as high holding power anchors defined by a
purchaser. Swing angles of stockless anchors, Type B,
classification society, if they are applied for type approval as
high holding power anchors and approved as such. High shall be 35º. The permissible tolerance of swing angles
holding power anchors, defined by a classification society shall be ±1°. The permissible difference between
shall have two time or more the holding power than that
outboard and inboard swing angles of anchor fluke
available with stockless, anchors, Type A (Stockless Buwer
shall be determined between the parties concerned.
Anchor) of the same mass.
4 CONTRUCTION, SHAPE AND DIMENSIONS 6 MATERIALS
The material for each part of the anchor shall be as
4.1 Construction, Shape and Dimensions of Anchors
given in Table 7.
a) Stockless anchor, Type A (for ship use) (see
Fig. 1 and Table 1 and Table 2); 7 MANUFACTURING METHOD
b) HHP stockless anchor, Type B (for ship use) Cast steel shall be manufactured by casting in an
(see Fig. 2 and Table 3); electric furnace. Cast steel ingots shall be subjected to
1
IS 15846 : 2010
appropriate post-casting heat treatment according to NOTES
wall thickness. 1 Drop test, hammering test, and bending test shall be carried
out for cast steel only. Also drop test shall be carried out for
8 INSPECTION AND TESTING casings for anchors of ship use only. For anchors with a nominal
mass of 0.18 or less. Drop test and bending test may be omitted.
For anchors following inspections and testing shall be 2 The weighed mass of anchors shall be the one excluding the
carried out: stock for stock anchor and single fluke stock anchor, and shall
be the total weighed mass for stockless anchor.
8.1 Construction, Shape, Dimensions, Mass and
9 DESIGNATION
Visual Inspection
The anchors shall be designated by classification and
The construction, shape, dimensions, mass and
nominal mass (for stock anchors, their applications
appearance shall be inspected and shall comply with
shall be indicated).
the requirements specified and shall also be free from
detrimental defects to use. Example: Stock anchor Type A 1.500 (for ship use).
8.2 Drop Test 10 MARKING
The test shall be performed on each steel casting of 10.1 The anchor shall be marked on its body with the
the anchor with the anchor head being hung vertically; following.
the shank and stock horizontally; the body of stock
10.1.1 Stockless Anchor
anchor horizontally and vertically, and when they are
respectively, dropped from 4 m height onto steel a) Weighed mass of anchor head,
foundation, every casting shall be free from any crack b) Total weighed mass,
or other defects. The steel foundation shall be so
c) Manufacturer’s name or mark,
constructed that steel slab of 100 mm thick or more is
d) Proof test load, and
laid over the top of concrete block of one meter thick
e) Year and month of manufacturer or serial
or more.
number.
8.3 Hammering Test
10.1.2 Stock Anchor
After the drop test, the steel castings of the anchor shall
a) Weighed mass of stock,
be hung and hammered with a hammer weighing 3 to
b) Weighed mass of body,
7 kg, these shall be not result in any defects.
c) Manufacturer’s name or trade-mark,
8.4 Proof Loading d) Proof test load, and
The stock anchor and single fluke anchor shall be e) Year and month of manufacture or serial
subjected to proof inspection and no abnormal number.
deformation or other defects shall be observed after 10.2 BIS Certification Marking
the application of proof test load corresponding of the
weighed mass of anchors as given in Table 8, onto the The anchors may also be marked with the Standard
Mark.
positions as shown in the following Fig. 5 on each fluke
or stock anchor and single fluke stock, on both flukes 10.2.1 The use of the Standard Mark is governed by
simultaneously one side and next on the other side in the provisions of the Bureau of Indian Standards Act,
turned over state for stockless anchor. When anchors 1986 and the Rules and Regulations made thereunder.
are pulled form about 10 percent of proof test load to The details of conditions under which the licence for
full load and when released to the initial. Load, the the use of the Standard Mark may be granted to the
permissible change in the gauge length may be up to manufacturers or producers may be obtained from the
20 mm (see Notes 1 and 2) (see also Fig. 5). Bureau of Indian Standards.
2
IS 15846 : 2010
FIG. 1 STOCKLESS ANCHOR TYPE A
3
IS 15846 : 2010
Table 1 Mass and Dimensions for Head and Crown Pin of Stockless Anchor (Type A)
(Clause 4.1)
Nominal Mass 60 80 100 120 140 165 180 190 200 240
kg
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
h(26.374 3√G) 103 114 122 130 137 144 149 152 154.236 164
h1 (3.51 h) 362 400 428 456 481 505 523 534 541.4 576
h2 (3.01 h) 310 343 367 391 412 433 448 458 464.25 494
h3 (2.53 h) 261 288 309 329 347 364 377 385 390.22 415
h4 (0.89 h) 92 101 109 116 122 128 133 135 137.27 146
h5 (1.68 h) 173 192 205 218 230 242 250 255 259.12 276
h6 (0.37 h) 38 42 45 48 51 53 55 56 57.07 61
h7 (0.34 h) 35 39 41 44 47 49 51 52 52.44 56
h8 (0.10 h) 10 11 12 13 14 14 15 15 15.42 16
h9 (0.27 h) 28 31 33 35 37 39 40 41 41.64 44
h10 (0.20 h) 21 23 24 26 27 29 30 30 30.85 33
h11(0.67 h) 69 76 82 87 92 96 100 102 103.34 110
h12 (0.31 h) 32 35 38 40 42 45 46 47 47.82 51
h13 (0.93 h) 96 106 113 121 127 134 139 141 143.44 153
h14 (0.35 h) 36 40 43 46 48 50 52 53 53.98 57
h15 (0.42 h) 43 48 51 55 58 60 63 64 64.78 69
h16 (1.06 h) 109 121 129 138 145 153 158 161 163.49 174
h17 (0.39 h) 40 44 48 51 53 56 58 59 60.15 64
h18 (0.56 h) 58 64 68 73 77 81 83 85 86.37 92
h19 (0.38 h) 39 43 46 49 52 55 57 58 58.61 62
h20 (0.41 h) 42 47 50 53 56 59 61 62 63.34 67
h21 (0.46 h) 47 52 56 60 63 66 69 70 70.95 75
h22 (0.70 h) 72 80 85 91 96 101 104 106 107.96 115
h23 (0.329 h) 34 38 40 43 45 47 49 50 50.74 54
h24 (0.29 h) 30 33 35 38 40 42 43 44 44.73 48
h25 (0.26 h) 27 30 32 34 36 37 39 40 40.1 43
h26 (0.87 h) 90 99 106 113 119 125 130 132 134.18 143
h27 (0.40 h) 41 46 49 52 55 58 60 61 61.7 66
h28 (0.32 h) 33 36 39 42 44 46 48 49 49.35 52
h29 (0.335 h) 35 38 41 44 46 48 50 51 51.67 55
h30 (1.37 h) 141 156 167 178 188 197 204 208 211.30 225
h31 (0.75 h) 77 86 92 98 103 108 112 114 115.68 123
h32 (1.44 h) 148 164 176 187 197 207 215 219 222.09 236
h33 (0.62 h) 64 71 76 81 85 89 92 94 95.63 102
h34 (2.28 h) 235 260 278 296 312 328 340 347 351.67 374
h35 (0.48 h) 49 55 59 62 66 69 72 73 74.03 79
h36 (0.14 h) 14 16 17 18 19 20 21 21 21.59 23
h37 (0.71 h) 73 81 87 92 97 102 106 108 109.51 116
h38 (0.44 h) 45 50 54 57 60 63 66 67 67.86 72
h39 (1.63 h) 168 186 199 212 223 235 243 248 251.40 267
h40 (0.58 h) 60 66 71 75 79 84 86 88 89.46 95
h41 (0.51 h) 53 58 62 66 70 73 76 78 78.66 84
h42 (1.3 h) 134 148 159 169 178 187 194 198 200.51 213
h43 (2.51 h) 259 286 206 326 344 361 374 382 387.13 412
h44 (0.24 h) 25 27 29 31 33 35 36 36 37.02 39
h45 (0.449 h) 46 51 55 58 62 65 67 68 69.25 74
h46 (0.45 h) 46 51 55 58 62 65 67 68 69.41 74
h47 (1.39 h) 143 158 170 181 190 200 207 211 214.39 228
h48 (0.436 h) 45 50 53 57 60 63 65 68 87.25 72
4
IS 15846 : 2010
Table 1 (Continued)
Nominal Mass 300 360 420 480 570 660 780 900 1 020 1 140
kg
(1) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
h(26.374 3√G) 176 188 198 206 219 230 243 254 266 276
h1 (3.51 h) 618 660 695 723 769 807 853 892 934 969
h2 (3.01 h) 530 566 596 620 659 692 731 765 801 831
h3 (2.53 h) 445 476 501 521 554 582 615 643 673 698
h4 (0.89 h) 157 167 176 183 195 205 216 226 237 246
h5 (1.68 h) 296 316 333 346 368 386 408 427 447 464
h6 (0.37 h) 65 70 73 76 81 85 90 94 98 102
h7 (0.34 h) 60 64 67 70 74 78 83 86 90 94
h8 (0.10 h) 18 19 20 21 22 23 24 25 27 28
h9 (0.27 h) 48 51 53 56 59 62 66 69 72 75
h10 (0.20 h) 35 38 40 41 44 46 49 51 53 55
h11(0.67 h) 118 126 133 138 147 154 163 170 178 185
h12 (0.31 h) 55 58 61 64 68 71 75 79 82 86
h13 (0.93 h) 164 175 184 192 204 214 226 236 247 257
h14 (0.35 h) 62 66 69 72 77 80 85 89 93 97
h15 (0.42 h) 74 79 83 87 92 97 102 107 112 116
h16 (1.06 h) 187 199 210 218 232 244 258 269 282 293
h17 (0.39 h) 69 73 77 80 85 90 95 99 104 108
h18 (0.56 h) 99 105 111 115 123 129 136 142 149 155
h19 (0.38 h) 67 71 75 78 83 87 92 97 101 105
h20 (0.41 h) 72 77 81 84 90 94 100 104 109 113
h21 (0.46 h) 81 86 91 95 101 106 112 117 122 127
h22 (0.70 h) 123 132 139 144 153 161 170 178 186 193
h23 (0.329 h) 58 62 65 68 72 76 80 84 88 91
h24 (0.29 h) 51 55 57 60 64 67 70 74 77 80
h25 (0.26 h) 46 49 51 54 57 60 63 66 69 72
h26 (0.87 h) 153 164 172 179 191 200 211 221 231 240
h27 (0.40 h) 70 75 79 82 88 92 97 102 106 110
h28 (0.32 h) 56 60 63 66 70 74 78 81 85 88
h29 (0.335 h) 59 63 66 69 73 77 81 85 89 92
h30 (1.37 h) 241 258 271 282 300 315 333 348 364 378
h31 (0.75 h) 132 141 148 154 164 172 182 190 200 207
h32 (1.44 h) 253 271 285 297 315 331 350 366 383 397
h33 (0.62 h) 109 117 123 128 136 143 151 157 165 171
h34 (2.28 h) 401 429 451 470 499 524 554 579 606 629
h35 (0.48 h) 84 90 95 99 105 110 117 122 128 132
h36 (0.14 h) 25 26 28 29 31 32 34 36 37 39
h37 (0.71 h) 125 133 141 146 155 163 173 180 189 196
h38 (0.44 h) 77 83 87 91 96 101 107 112 117 121
h39 (1.63 h) 287 306 323 336 357 375 396 414 434 450
h40 (0.58 h) 102 109 115 119 127 133 141 147 154 160
h41 (0.51 h) 90 96 101 105 112 117 124 130 136 141
h42 (1.3 h) 220 244 257 268 285 299 316 330 346 359
h43 (2.51 h) 442 472 497 517 550 577 610 638 668 693
h44 (0.24 h) 42 45 48 49 53 55 58 61 64 66
h45 (0.449 h) 79 84 89 92 98 103 109 114 119 124
h46 (0.45 h) 79 85 89 93 99 104 109 114 120 124
h47 (1.39 h) 245 261 375 286 304 320 338 353 370 384
h48 (0.436 h) 77 82 86 90 96 100 106 111 116 120
5
