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INSTRUCTION MANUAL FOR

TYPE 2325

SYSTEM DESCRIPTIONAND OPERATING/MAINTENANCE

INSTRUCTIONS FOR

GFB

GAS FREEING COVER

REV. 1

CUSTOMER INFORMATIONOWNER: HULL NO.: PRES-VAC REF. NO.:

PRES-VAC ENGINEERING A/S PHONE: +45 4817 4055

SVANEVANG 3-5 TELEFAX: +45 4817 1788

DK-3450 ALLERD E-mail: presvac@pres-vac.com

DENMARK

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INSTRUCTION MANUAL

GAS FREEING COVER

TYPE 2325

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Rev. 1 December 10, 2009

CONTENTSPage

1. Functional System Description ....................................................................................... 3

1.1. General ................................................................................................................... 3

1.2. Function .................................................................................................................. 3

1.3. Capacity .................................................................................................................. 3

2. Operating Instructions ................................................................................................... 3

2.1. Installation .............................................................................................................. 3

2.2. Operation ................................................................................................................ 3

3. Maintenance Instructions ............................................................................................... 4

3.1. General ................................................................................................................... 4

3.2 Safety Regulations for Maintenance Work .................................................................... 4

3.3 Directions for Disassembly / Assembly and Cleaning ..................................................... 4

4. Spares ............................................................................................................................ 5

DRAWING NO. 2325 .............................................................................................................. 6

5. Laboratory Report, Summary ......................................................................................... 7

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INSTRUCTION MANUAL

GAS FREEING COVER

TYPE 2325

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1. Functional System Description

1.1. GeneralThe purpose of the gas-freeing cover is to prevent the passage of flames into the cargo tanks during the

gas-freeing procedure.

1.2. FunctionUnder normal conditions there is free venting throughout the gas-freeing cover. If an ignition occurs

outside the tank space, the flames will be quenched in the flame trap.

1.3. CapacityThe gas-freeing covers capacity is rated in standard air. For convention to maximum loading rates for

different cargoes, please refer to the MASTERS LOADING CHART as per latest revision of IMO MSC/Circ.

731.

2. Operating Instructions

2.1. InstallationRemove all packing material

Installation is accomplished by bolting the gas-freeing cover flange to the vent pipe mating flange withsuitable gasket between.

As per SOLAS 1974, Reg 59 + 62, the cover shall be located 2 m above the cargo deck level, and thedischarge from the open cover shall be vertically upwards having an exit velocity of at least 20 m/sec.

2.2. OperationDuring gas-freeing the cover is open. When the hydrocarbon vapour concentration in the tank is reducedto less than 2% by volume, venting may also be at the cargo deck level. After gas-freeing, the cover isclosed and the wing nut tightened. Ref. SOLAS 1974 Regulation II-2/59.2.1.

CAUTION! If the gas-freeing cover has been exposed for an explosion, the cover must beinspected for any damage.

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INSTRUCTION MANUAL

GAS FREEING COVER

TYPE 2325

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Rev. 1 December 10, 2009

3. Maintenance Instructions

3.1. GeneralAs per SOLAS-requirements, the following service intervals shall be followed as a minimum:

After 6 month of operation, the cover shall be inspected for proper function and, if necessary, be cleaned.However, we recommend that the cover be inspected more often depending on the cargo type.

After further 6 months of operation, the cover shall be taken apart and cleaned.

NOTE! The need for inspection and cleaning may increase depending on operation conditions,the loading frequency and the type of cargo.

3.2. Safety Regulations for Maintenance WorkThe maintenance work can be carried out when the cover is mounted on the piping system or when thecover is removed and blind flanges mounted on the corresponding flange joints. In both cases, the cargotank should be gas-freed and depressurised before maintenance work is commenced.

Spark free tools should be used if maintenance work is carried out while the cover is mounted on thecargo tank.

WARNING! All maintenance work must be carried out with necessary precautions in regard to thecargos flammability and toxicity.

3.3. Directions for Disassembly / Assembly and Cleaning

The following procedures refer to drawing no 2325.

1. Open the cover2. Remove the retaining ring (item 6)3. Pull out the filter elements (item 5)

Inspection and cleaning4. The filter elements as well as the rim of the cover must be free from damages, and dust or deposit

must be removed. Do not clean the filter elements using tools - only a solvent should be used.5. In case of damages filter elements or gaskets, the damaged parts shall be replaced by genuine

PRES-VAC spare parts

NOTE! For cleaning we recommend thin lubrication oil and a brush. If any damage on anyparts is observed, repair or replacement must take place.

Assembly after cleaning and inspection

6. Assembly is done in the opposite sequence.

General

Screws and bolts not protected from loosening should be secured by a suitable adhesive, such as PRES-

VAC part no.: 1323-8.

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GAS FREEING COVER

TYPE 2325

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Rev. 1 December 10, 2009

4. SparesThere are no class requirements for carrying spares on board. If spares are required, please use the

following procedure:

1. Identify the components on the inserted drawing no. 2325

2. Advise builder of ship and new building number.

3. Advise Vessel name.

4. Advise serial number of the cover

When we have the above information, our files contain all further details.

When ordering spare parts, please call our office in DENMARK.

Our telefax and e-mail are open 24 hours a day

Telefax no. ....... +45 48 17 17 88

E-mail .............. presvac@pres-vac.com

Our telephone is open during normal office hours

Telephone no.: . +45 48 17 40 55

Our postal address:

PRES-VAC ENGINEERING ApS

Svanevang 3-5

DK-3450 Allerd

Denmark

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GAS FREEING COVER

TYPE 2325

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Rev. 1 December 10, 2009

DRAWING NO.: 2325 GAS-FREEING COVER Type GFB

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