ASTM F2936-23

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.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2023
• ICS: 47.020.50 - Deck equipment and installations
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.01 - Structures

Relations

• Refers: ASTM A27/A27M-20 - Standard Specification for Steel Castings, Carbon, for General Application
• Effective Date: 01-May-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2936 − 23 An American National Standard
Standard Specification for
1
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 3.1.3 mooring ring or pipe—a chock mounted in the bul-
wark and conforming to Type II and IV.
1.1 This specification covers the principal dimensions and
materials of closed chocks for installation on ships used for 3.1.4 rope contact area—that part of the fitting in contact
mooring. with the mooring line in normal mooring operations.
1.2 Chocks can be used with either wire rope or fiber and
4. Classification
synthetic ropes.
4.1 The size of the chocks will be identified by the nominal
1.3 Chocks are for mounting directly on a deck, seat
size “L” and “H” of the opening as shown in Table 1 and Table
(foundation), or for mounting in a bulwark.
2.
1.4 The values stated in SI units are to be regarded as
4.2 Chocks are furnished in types as follows:
standard. No other units of measurement are included in this
4.2.1 Type I—Deck mounted as shown in Fig. 1 and
standard.
conforming to all dimensions in Table 1.
1.5 This international standard was developed in accor-
4.2.2 Type II—Bulwark mounted as shown in Fig. 2 and
dance with internationally recognized principles on standard-
conforming to all dimensions in Table 2.
ization established in the Decision on Principles for the
4.2.3 Type III—Deck mounted, conforming only to dimen-
Development of International Standards, Guides and Recom-
sions “L” and “H” of Table 1 and is of adequate strength to at
mendations issued by the World Trade Organization Technical
least meet 7.2 requirement.
Barriers to Trade (TBT) Committee.
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
2
to at least meet 7.2 requirement.
2.1 ASTM Standards:
A27/A27M Specification for Steel Castings, Carbon, for
4.3 Chocks shall be furnished in either of the following
General Application
grades:
3
2.2 ANSI Standards:
4.3.1 Grade 1—Surface finish shall be in the as cast
B 46.1 Surface Texture (Roughness, Waviness, Lay)
condition.
4.3.2 Grade 2—Surface finish in way of rope contact shall
3. Terminology
be in accordance with 8.2.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bulwark—a structural enclosure along the edge of the
5. Ordering Information
ship to serve as a rail.
5.1 Orders for chocks under this specification shall include
3.1.2 closed chock—a metal flared ring-like fitting mounted
this standard, date, and the following:
on a ship, through which mooring lines pass to moor a ship.
5.1.1 Descriptive information (size, material, etc.) of moor-
ing lines,
1 5.1.2 Quantity (number) of chocks required,
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
5.1.3 Size (opening, L × H),
Structures.
5.1.4 Type and grade,
Current edition approved May 1, 2023. Published May 2023. Originally
ɛ1
approved in 2012. Last previous edition approved in 2018 as F2936 – 12 (2018) . 5.1.5 Primer and coating, if any (see 8.3), and
DOI:10.1520/F2936-23.
5.1.6 Marking.
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. Materials and Manufacture
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
6.1 Material shall be cast steel in accordance with Specifi-
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. cation A27/A27M, Grade 60–30.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F2936 − 23
TABLE 1 Dimension Requirements (see Fig. 1)
(Units: mm)
Nominal size
l l l l H H H R R 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×
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: F2936 − 12 (Reapproved 2018) F2936 − 23 An American National Standard
Standard Specification for
1
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
ε NOTE—Keywords section was editorially added in March 2018.
1. 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.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A27/A27M Specification for Steel Castings, Carbon, for General Application
3
2.2 ANSI Standards:
B 46.1 Surface Texture (Roughness, Waviness, Lay)
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bulwark—a structural enclosure along the edge of the ship to serve as a rail.
3.1.2 closed chock—a metal flared ring-like fitting mounted on a ship, through which mooring lines pass to moor a ship.
3.1.3 mooring ring or pipe—a chock mounted in the bulwark and conforming to Type II and IV.
1
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
Structures.
Current edition approved March 1, 2018May 1, 2023. Published April 2018May 2023. Originally approved in 2012. Last previous edition approved in 20122018 as F2936
ɛ1
– 12. DOI:10.1520/F2936-12R18E01.12 (2018) . DOI:10.1520/F2936-23.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F2936 − 23
3.1.4 rope contact area—that part of the fitting in contact with the mooring line in normal mooring operations.
4. Classification
4.1 The size of the chocks will be identified by the nominal size “L” and “H” of the opening as shown in Table 1 and Table 2.
4.2 Chocks are furnished in types as follows:
4.2.1 Type I—Deck mounted as shown in Fig. 1 and conforming to all dimensions in Table 1.
4.2.2 Type II—Bulwark mounted as shown in Fig. 2 and conforming to all dimensions in Table 2.
4.2.3 Type III—Deck mounted, conforming only to dimensions “L” and “H” of Table 1 and is of adequate strength to at least meet
7.2 requirement and the requirements of Sections requirement.6 to 10.
4.2.4 Type IV—Bulwark mounted, conforming only to dimensions “L” and “H” of Table 2 and is of adequate strength to at least
meet 7.2 requirement and the requirements of Sections requirement.6 to 10.
4.3 Chocks shall be furnished in either of the following grades:
4.3.1 Grade 1—Surface finish shall be in the as cast condition.
4.3.2 Grade 2—Surface finish in way of rope contact shall be in accordance with 8.2.
TABLE 1 Dimension Requirements (see Fig. 1)
(Units: mm)
Nominal size
l l l l H H H R R 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
5
...