Specification_Work_Item_14_(Revised_05-08-2017).pdf

42410_1215_FLT

REC_42410_FLT_270B WMEC (1215)

WORK ITEM 14: Fathometer Transducer, Renew

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew the transducer(s).

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN QTY

ESTIMATED

COST

($/UNIT)

N

*** Fathometer transducer, shallow water, 50-200 kHz

(Airmar Technology SS505) (without adapter plate)

NSN: 5845-01-470-2500

1 ea. 346.83

Y ** Fathometer Transducer, deep water, 12 kHz (ODOM Hydrographic Inc.)

NSN: 5845-01-460-9969 1 ea. 14,530.00

***Government-furnished property, which is to be supplied by either the vessel or the C4IT Service Center.

**New or refurbished equipment that the Government may provide for installation in place of existing equipment.

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 905 WMEC 184-010, Rev E, Transducer Foundations & Shell

Mods Coast Guard Drawing FL 6713-203, Rev -, CRP-V850 Transducer (SS505) Adapter

Assembly

COAST GUARD PUBLICATIONS

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2014, General Requirements Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2014, Welding and Allied Processes

OTHER REFERENCES

Federal Specification (Fed Spec) HH-P-151, Mar 1991, Packing; Rubber-Sheet, Cloth-

Insert

Raytheon V850 Color Echosounder, 2nd Edition, Mar 1993, Operation Manual ODOM Echotrac DF3200 MKII, Rev 2, Technical Manual

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None.

3.1.2 Tech Rep.

Not applicable.

3.1.3 Protective measures. The Contractor 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, the Contractor 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.

3.1.3.1 Transducer and lines. Protect all exposed ends of transmission lines, control lines, connectors, and cables from weather, moisture, and physical damage while they are disconnected from the transducer. Take all necessary measures to protect transducer from damage during the performance of work specified herein. Inform the COR, in writing, of all damage, if any, that is incurred by the transducer.

3.1.4 Interferences. The Contractor shall handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences).

3.2 Transducer renewal particulars. The Contractor shall accomplish the following tasks using ODOM Echotrac Technical Manual, Raytheon Echosounder Technical Manual and Coast Guard Drawing FL 6713-203 for guidance:

3.2.1 Transducer removal. Disconnect and remove the existing fathometer transducers taking care not to damage the ODOM transducer. Retain the ODOM transducer and mounting hardware for reinstallation. Dispose of the shallow water transducer.

NOTE

Do not discard any hull ring adapter(s). They are to be reused with the new transducer(s).

3.2.2 New transducer installation. Install new Government-furnished transducer(s), in place of the removed. Reinstall each hull ring adapter and transducers in accordance with the applicable drawing listed in Section 2 (References) using new gaskets, mold release coating, and adhesive sealants. Apply mold release aerosol coating to both adaptor orifice and transducer to facilitate future removal of the transducer from the adaptor ring.

NOTE

A piece of neoprene or a washer may need to be placed at the bottom of the hull ring adaptor to facilitate transducer and bottom of hull ring flushness.

3.2.2.1 Using chocking compound as transducer bedding material, install transducer into hull ring adaptor. After the chocking compound has cured, paint the bottom half of the hull ring adaptor and transducer in accordance with drawing notes.

3.2.2.2 Renew the transducer head to hull ring gasket with new gasket conforming to HH-P-151, Class 4. Using appropriate thickness gasket, place gasket on adaptor plate of transducer; apply ½” bead of marine adhesive on adaptor plate along the inside edge of the gasket. Install transducer flush with hull.

3.2.2.3 Reconnect each transducer cable to its terminal board in the adjacent connection box.

Renew all stuffing tube packing and seals. Inspect the connection in the presence of the Coast Guard Inspector. Submit a CFR. If cable renewal is authorized via approved Change Request, cut the transducer cable to length leaving 2-foot service loop in the cable. Ensure cables are installed in a manner to prevent any chaffing which may require new cable way clamps and stuffing tubes.

3.2.2.4 Following completion of transducer installation, fabricate a ¾” × 3” × ¼” aluminum label plate, engraved with ¼-inch high numbers stating the installation date. Affix a label plate, using suitable epoxy cement. Ensure that the label plate is visible and legible, without the need to move equipment or cables.

3.2.2.5 Thoroughly clean the transducer radiating surfaces with a strong solution of household detergent to remove any oil, dirt, and all other surface contaminants.

3.3 Transducer seal. If not waterborne, the Contractor shall inspect the transducer to ensure that its outer circumference is installed flush to the hull ring and the transducer cover plate forms a tight seal with the hull ring. Submit CFR.

3.4 Post installation tests. After completion of work, the Contractor shall accomplish the following tasks, in the presence of the Coast Guard Inspector:

3.4.1 Preliminary leak test. If not waterborne, inspect and perform a water hose test of all affected boundaries in accordance with SFLC Std Spec 0740, Appendix C. If waterborne, slowly back off the emergency cover plate bolts and allow seawater to flood the transducer well. No leakage allowed. Submit a CFR.

3.4.2 Not waterborne. Replace the hull ring set screws with new Monel fasteners, coating the threads with anti-seize compound. Recess the set screws ⅛” and cover with beeswax tallow.

3.4.3 Waterborne. Using a diver, remove and retain the hull ring set screws. Install an emergency cover plate and gasket over the transducer to be renewed. If available, the vessel’s emergency cover plate may be used; otherwise a new cover plate shall be fabricated and turned over to the vessel at the completion of the work.

3.4.3.1 Slowly back off the fasteners that normally maintain the transducer pressure boundary to sea. Ensure that any leakage through the emergency cover plate pressure boundary is minor prior to proceeding with transducer removal.

3.4.3.2 Upon completion of work and preliminary leak testing, completely remove the emergency cover plate. Clean all vacated tapped holes of anti-seize compound and beeswax tallow. Chase all threads. Install new Monel set screws in each hull ring, coating the threads with anti-seize compound. Recess the set screws ⅛” and cover with beeswax tallow.

3. 5 Leak repairs. The Contractor shall observe each transducer for leaks during the vessel re-floating process (if drydocked) or emergency cover plate removal (if waterborne). Repair all leaks detected. Submit a CFR.

3.6 Operational test – post repairs. After completion of work, the Contractor shall thoroughly test and prove the transducer(s) to be in satisfactory operating condition. Submit a CFR.

4. NOTES

4.1 Operation of equipment. Coast Guard personnel will operate all shipboard machinery and equipment.

WORK ITEM 14: Fathometer Transducer, Renew