Anchor Chains and Ground Tackle Inspect and Repair.pdf

55 (Rev-0)

58101_1019_FLT

REC_58110_FLT_270B WMEC (ALL) (1019)

Anchor Chain(s) and Ground Tackle, Inspect and Repair

1. SCOPE

1.1 Intent. This work item describes the requirements for industrial to perform inspection, preservation and repairs to the anchor chain assemblies (port and starboard), including associated ground tackle.

1.2 Government-furnished property.

None.

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 905 WMEC 581-001, Rev D, Anchor Handling A & D

Coast Guard Drawing 905 WMEC 631-001, Rev L, Paint Schedule

COAST GUARD PUBLICATIONS

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2018, General Requirements

Surface Forces Logistics Center Standard Specification 6310 (SFLC Std Spec 6310), 2018, Requirements for Preservation of Ship Structures

OTHER REFERENCES

American Bureau of Shipping (ABS) Approved Chain, Accessory and Bar Manufacturing Facilities List, Oct 2016

Federal Specification (Fed Spec) RR-C-271, Rev E, Mar 2016, Chains and Attachments, Carbon and Alloy Steel

MIL-DTL-23549, Sep 2016, Grease, General Purpose

MIL-C-24633, Oct 2014, Chain, Stud Link, Anchor, Low Alloy Steel, Flash Butt Welded

The Society for Protective Coatings (SSPC)/NACE International (NACE) Joint Surface Preparation Standard SSPC-SP 6/NACE No. 3, 2007, Commercial Blast Cleaning

The Society for Protective Coatings (SSPC) Surface Preparation Specification No. 1 (SSPC-SP 1), 2015, Solvent Cleaning

56 (Rev-0)

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.: N/A

3.1.2 Tech Rep.

Not applicable.

3.1.3 Protective measures. The Ships Force(SF) shall furnish and install all protective coverings to seal off and protect all non-affected vessel's components, equipment, and spaces near the work area against contamination during the performance of work. Upon completion of work, SF shall remove all installed protective measures, inspect for the presence of contamination, and return all contaminated equipment, components, and spaces to original condition of cleanliness.

3.1.4 Interferences. Unit will be in a dockside period from Aug 5th to Sep 27th.

3.2 Required work particulars. Industrial shall use the chain description (see 4.1 (Component characteristics)) and Coast Guard Drawing 905 WMEC 581-001 for guidance, for accomplishing the tasks specified below for each anchor chain assembly.

3.2.1 Removal. Disconnect and remove the anchor and anchor chain assembly and fake out the chain on the pier or in a suitable location, to facilitate the performance of the tasks specified herein.

NOTE

The use of Coast Guard equipment (e.g. anchor windlass) for off-loading and on-loading of anchors and anchor chain is authorized. Coast Guard personnel will operate all Government equipment.

3.2.2 Pre-inspection surface preparation.

3.2.2.1 Pressure wash the anchor, anchor chain and other components with fresh water and a fire hose to remove any mud, salts, or other contaminants adhering to the chain

3.2.2.2 Prepare the anchor and all shots of chain (including swivel shot) to a “Commercial Blast” standard, in accordance with SSPC-SP 6.

3.2.3 Inspections. Perform the following inspections and submit a CFR:

3.2.3.1 Visual inspection. Visually inspect the following:

All swivels, outboard swivel shots, pelican hook and shackles, and cats paw (if applicable).

Entire length of Shot 1, Shot 2, Shot n-1, and Shot n.

57 (Rev-0)

NOTES

1. For the purpose of reference in this item, the shots will be referred to by numbers. Mark each shot with a removable tag. Moving inboard from the anchor, the shots will be referred to as follows: ANCHOR, Shot 1, Shot 2, Shot 3...Shot n-2, Shot n-1, Shot n, and BITTER END. These shot numbers are designated in the order existing prior to work, and will not change -although the shot order itself will change.

2. Number n in the paragraph above is equal to the number of shots per chain.

3.2.3.2 Measurements – and condemning criteria.

3.2.3.2.1 Determine the suitability for continued service of the anchor chain assembly, by checking wire diameter dimension, using information provided in Table I (Dimensions for Condemning Anchor Chain) as guidance, as applicable. Gage the wire diameter of ten links per shot of chain, ensuring that each link shall be separated by approximately 10% of the shot length.

NOTE

For commercial grade chain, use 90 percent of the link diameter for condemning criteria.

58 (Rev-0)

TABLE 1 - DIMENSIONS FOR CONDEMNING ANCHOR CHAIN

SIZE OF CHAIN

(INCHES)

90 PERCENT OF

LINK DIAMETER(1)

(INCHES)

SIX-LINK

DIMENSION(2)

(INCHES)

1 0.90 26-3/4

1-1/8 1.013 30-1/16 1-1/4 1.125 33-7/16 1-3/8 1.238 36-3/4 1-1/2 1.35 40-1/8 1-5/8 1.463 43-7/16 1-3/4 1.575 46-13/16 1-7/8 1.688 50-1/8

2 1.80 53-1/2 2-1/8 1.913 56-13/16 2-1/4 2.025 60-3/16 2-3/8 2.138 63-1/2 2-1/2 2.25 66-7/8 2-5/8 2.363 70-3/16 2-7/8 2.475 73-9/16

3 2.558 76-7/8

1. Use a micrometer, caliper or GO/NO-GO gage* to check wire diameter dimension. Gage is to be made by Contractor/repair facility in accordance with the dimensions shown in Table 1 above. Check the diameters at right angles to the link. When measuring with a micrometer or caliper take one-half the sum of the two diameters as representing the line diameter.

2. Take six-link measurements with a load applied to the chain in order to take all slack out of the chain. Use a bar gauge to check the six-link dimension. When the gauge will not fit over six links, the chain has been stretched beyond allowable limit. Measure six links for the entire length of each shot, measuring from every third link.

*When using a GO/NO-GO gage, a failed check is to be verified by measuring with a micrometer or caliper. Measure the diameter at right angles and take one-half the sum of the two diameters as representing the link diameter. Take measurements on clean, bare metal.

3.2.4 Detachable link assemblies maintenance.

NOTE

Detachable link components are not interchangeable.

3.2.4.1 Renew all detachable link taper pins and associated hairpins and taper pin plugs.

3.2.4.2 Assemble detachable links, swivels and shackles; and repack detachable links with molybdenum disulfide grease (MIL-DTL-23549).

3.2.4.3 Change the relative position of the shots, as designated by the Coast Guard Inspector, to distribute the wear on the chain, ensuring that shot shall be rotated end for end upon reinstallation, as follows:

ANCHOR, Shot 3... Shot n-2, Shot n-1, Shot n, Shot 1, Shot 2, BITTER END.

3.2.4.4 Renew shackle at bitter end of chain.

59 (Rev-0)

3.2.5 Chain renewal. If a Change Request has been released, renew designated section of chain with material conforming to MIL-C-24633. See paragraph 4.2 (Supply Information).

3.2.6 Surface coating. Using the coating system specified for “Anchor/Anchor Chain” in SFLC Std Spec 6310, Appendix A (Cutters and Boats Exterior Painting Systems), do the following:

3.2.6.1 Perform solvent cleaning of all surfaces specified to be coated (see below), in accordance with

SSPC-SP 1.

3.2.6.2 Coat the anchor White (17925) and all shots of chain Black (17038).

3.2.6.3 Color-coat the following shots:

Shot n-1: Black (17038).

Shot n: Black (17038).

Shot 1: Yellow (13538).

Shot 2: Red (11105).

3.2.6.4 Color coat/mark all detachable links, adjacent chain links, shackles, and swivels in accordance with Attached Figure “Painting and Markings On Mooring Chain”.

3.2.6.4.1 Remove all existing stainless steel wire prior to the installation of new markings.

3.2.6.4.2 Install new stainless steel wiring as shown in General Note 4.2 of Coast Guard Drawing 905

WMEC 631-001.

3.2.7 Chain restowing. When directed by the Coast Guard Inspector, reassemble the anchor and anchor chain; restow the anchor chain in its chain locker, free for running, with the anchor properly housed and secured with the chain stopper set.

3.2.7.1 Lead the bitter ends down and through the deck bolts in the chain locker and secure to the chain locker pad eye.

3.2.7.2 Back out the chains to ensure the chain stopper is set properly.

3.2.7.3 Ensure that:

the bitter ends of the chain are securely fastened in the chain locker with new bitter end shackles, conforming to Fed Spec RR-C-271, Type IV-A, Class 3, Grade A.

the ground tackle is kept ready for use.

nothing interferes with a readiness to veer or slip the anchors.

the detachable links located just inboard of the riding stopper and the detachable link tool set are readily accessible for use in slipping the anchor chains in an emergency.

the anchor has a crown buoy attached, with sufficient length of rope to facilitate indicating the depths of water in which moored.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

60 (Rev-0)

3.3 Operational test, post repairs. After completion of work, the Industrial shall, in the presence of the Coast Guard Inspector, thoroughly test the anchor chain assembly to prove satisfactory operating condition, by releasing the chain stoppers and lowering both anchors under power to the drydock floor (or waterline, as applicable), letting out one additional shot, and raising again to ensure chains run on the wildcats without binding.

3.3.1 Correct any discrepancies, house the anchors and set the anchor chain pelican hooks.

3.3.2 Submit a CFR.

3.4 Touch-up preservation. The Contractor shall prepare and coat all new and disturbed surfaces to match existing adjacent surfaces, in accordance with SFLC Std Spec 6310, paragraph 3.1.13 (Touch-ups and minor coating repairs).

4. NOTES

4.1 Component characteristics. Each anchor weighs 4,000 pounds and each chain is 1-1/2 inch Die-Lock, with a length of 8 shots. All shots of anchor chain include the corresponding detachable link(s).

USCGC FORWARD (WMEC-270B) DOCKSIDE AVAILABILITY FY2021

61 (Rev-0)

B L

U E

S ee

N ot e

H U

L L

B L

A C

K B

L A

C K

W H

IT

E

Y E

L L

O W

R E

D

N O

T E

R ep ea t r ed

, w hi te , b lu e m ar ki ng of d et ac ha bl e lin ks u nt il n ex t t o la s t in bo ar d sh ot

PAINTING AND MARKINGS

ON MOORING CHAIN

C ol or pe r N ot e

R E

D S ee N o t e

W

H

IT

E W

H

IT

E

S e e

N ot e

D E

T A

C H

A B

L E

L

IN

K

T Y

P

(1

USCGC FORWARD (WMEC-270B) DOCKSIDE AVAILABILITY FY2021

62 (Rev-0)

4.2 Supply information. An ABS approved list of chain manufacturers may be found at the following website: http://ww2.eagle.org/en/rules-and-resources/approved-manufacturers-and-products.html