ASTM F2936-12

Standard Specification for Chocks, Ship Mooring, Cast Steel

ABSTRACT
This specification covers the principal dimensions and materials of closed chocks for installation on ships used for mooring. It specifies the classification of chocks, their dimension requirements, and strength requirements. It also demonstrates the proper horizontal and vertical loading for Type A and Type B chocks.
SCOPE
1.1 This specification covers the principal dimensions and materials of closed chocks for installation on ships used for mooring.
1.2 Chocks can be used with either wire rope or fiber and synthetic ropes.
1.3 Chocks are for mounting directly on a deck, seat (foundation), or for mounting in a bulwark.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

General Information

• Status: Historical
• Publication Date: 31-Dec-2011
• ICS: 47.020.50 - Deck equipment and installations
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.01 - Structures

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F2936 −12 An American National Standard
Standard Specification for
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Chocks, Ship Mooring, Cast Steel
This standard is issued under the fixed designation F2936; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Classification
4.1 The size of the chocks will be identified by the nominal
1.1 This specification covers the principal dimensions and
size “L” and “H” of the opening as shown in Table 1 and Table
materials of closed chocks for installation on ships used for
2.
mooring.
4.2 Chocks are furnished in types as follows:
1.2 Chocks can be used with either wire rope or fiber and
4.2.1 Type I—Deck mounted as shown in Fig. 1 and
synthetic ropes.
conforming to all dimensions in Table 1.
1.3 Chocks are for mounting directly on a deck, seat
4.2.2 Type II—Bulwark mounted as shown in Fig. 2 and
(foundation), or for mounting in a bulwark.
conforming to all dimensions in Table 2.
1.4 The values stated in SI units are to be regarded as 4.2.3 Type III—Deck mounted, conforming only to dimen-
sions “L” and “H” of Table 1 and is of adequate strength to at
standard. No other units of measurement are included in this
standard. least meet 7.2 requirement and the requirements of Sections 6
to 10.
4.2.4 Type IV—Bulwark mounted, conforming only to di-
2. Referenced Documents
mensions “L” and “H” of Table 2 and is of adequate strength
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2.1 ASTM Standards:
to at least meet 7.2 requirement and the requirements of
A27/A27M Specification for Steel Castings, Carbon, for
Sections 6 to 10.
General Application
4.3 Chocks shall be furnished in either of the following
2.2 ANSI Standard:
grades:
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B 46.1 Surface Texture
4.3.1 Grade 1—Surface finish shall be in the as cast
condition.
3. Terminology
4.3.2 Grade 2—Surface finish in way of rope contact shall
3.1 Definitions of Terms Specific to This Standard:
be in accordance with 8.2.
3.1.1 bulwark—a structural enclosure along the edge of the
ship to serve as a rail.
5. Ordering Information
3.1.2 closed chock—a metal flared ring-like fitting mounted
5.1 Orders for chocks under this specification shall include
on a ship, through which mooring lines pass to moor a ship.
this standard, date, and the following:
5.1.1 Descriptive information (size, material, etc.) of moor-
3.1.3 mooring ring or pipe—a chock mounted in the bul-
ing lines,
wark and conforming to Type II and IV.
5.1.2 Quantity (number) of chocks required,
3.1.4 rope contact area—that part of the fitting in contact
5.1.3 Size (opening,L×H),
with the mooring line in normal mooring operations.
5.1.4 Type and grade,
5.1.5 Primer and coating, if any (see 8.3), and
5.1.6 Marking.
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This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.01 on
6. Materials and Manufacture
Structures.
Current edition approved Jan. 1, 2012. Published February 2012. DOI: 10.1520/
6.1 Material shall be cast steel in accordance with Specifi-
F2936-12.
cation A27/A27M, Grade 60-30.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.2 For Types III and IV the manufacturer shall certify that
Standards volume information, refer to the standard’s Document Summary page on
strength of the chock will at least meet 7.2 requirement, and
the ASTM website.
3
that it is suitable for the mooring lines specified in the ordering
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. information.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F2936−12
TABLE 1 Dimension Requirements (see Fig. 1)
(Units: mm)
Nominal size
l l l l H H H RR R R
1 2 3 4 1 2 3 1 2 3
L×H×D
250×200×214 488 453 76 265 427 368 108 100 219 160 108
300×250×286 614 565 89 330 551 481 144 125 282 212 144
350×250×333 716 660 114 403 601 525 168 125 308 232 168
400×250×381 820 754 139 475 652 553 192 125 335 236 192
450×250×381 870 804 164 524 652 553 192 125 335 236 192
500×250×381 920 854 189 574 652 553 192 125 335 236 192
400×250×428 870 796 139 500 701 609 216 125 360 268 216
450×250×428 920 846 164 550 701 609 216 125 360 268 216
500×250×428 970 896 189 600 701 609 216 125 360 268 216
500×400×428 970 896 176 600 851 759 216 200 435 343 216
A
500×250×525 1068 1000 190 652 798 675 264 125 409 286 264
A
500×400×525 1068 1000 193 652 948 825 264 200 484 361 264
B
500×250×525 1074 1000 176 652 801 680 264
...