2 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO When nominated to load grain cargo ship staff shall remember the following issues :Even after discharging other grain cargo prior to nomination, the holds will require as thorough cleaning and preparation as required for any other previous cargo.There shall be no trace of any previous cargo residue anywhere in the holds and its structures.There shall be no Loose Rust or flaking paint patches allowed at any part of the cargo holds.The hatch covers underneath and hatch coamings with their channels & drainage shall be free of loose rust, paint flakes and cargo residue.
3 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO 5. Cargo holds bulkheads and sides and hopper plates shall have no previous cargo dirty stains (coal or dark ore cargo stains)6. Rust on the Tank top is common on bulk carriers. Loose rust is not accepted. Hard adhering rust need not be removed.7. Cargo holds and weather decks shall be inspected after cleaning and washing to ensure that there is no trace of any live or dead insect/weevils8. The cargo hold bilges shall be clean, free of any trace of previous cargo residue or rust particles and odour-free. The bilge suction effectiveness shall be verifiedWeather deck including cross decks and around the coaming stays and underneath pipelines shall have no trace of previous cargo residue.
4 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO Hold cleaning Criteria :Previous cargo determinationFind out what was last 3-5 cargoes carried and inform all crew so that allknow what cargo residue to look for.2. Removal of cargo residue:Air Blow from top using high pressure air ( air nozzle tied to long pole to reach all accessible corners) or if available, close washing with high pressure (250 bars and above) water lance gunspecial attention to following areas:Australian ladder and its platforms and stanchionsBeams and girders under cross decksPipe guards recess behind the pipesLarge pipes holding brackets behind the pipesBehind the flat face of the transverse framesHorizontal stringer plates wherever fitted
5 Cargo hold-cargo residue of cement sticking all over
6 Brackets for pipes where cargo residues usually accumulate
7 Cargo residue stuck hard behind shell frames Frame face plateCargo residue
9 The areas under cross decks where the beams and girder flanges can have cargo residue Flanges of beams & girders
10 Solid plate guards of pipes passing through holds Solid plate guards of pipes passing through holds. Cargo residue remains inside the guard plates and bracketsbracketsCargo residue
11 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO 3. Removal of Loose Rust & Paint Flakes:Wherever loose rust is suspected (general appearance of paint flakes or blisters on painted surface) a sharp hand scraper shall be used to take off the peeling rust & paint flakesSpecial attention to following areas:Australian ladder and its platforms, hand rails and stanchionsBeams and girders under cross decksPipe guards recess and behind the pipesLarge pipes holding brackets and behind the pipesBehind the flat face and vertical face of the transverse frames and brackets- also hopper tank platesHatch coamings and under hatch coversMan entry booby hatches & covers
12 Loose rust flakes and blisters on hold bulkheads Loose rust and rust blisters and paint blisters
13 Widespread rust blisters on cargo hold bulkhead
14 Rust scales on side frames which come off with scraper
18 PREPARING HOLDS FOR GRAIN Condition of underneath of hatch coversInspect condition of underneath of H/Covers when in open conditionAny loose rust or cargo residue shall be scraped offAreas around the grain hole/ cement holes –special attentionH/Cover vent louvres and nets are usually found rustyPaint the scraped areas to have clean lookH/Cover channels and drains require clean appearance-no cargo residue accepted
25 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO 5. Removal of previous cargo stainCargo stains left by previous dirty cargos such as Coal and Mineral Ores must be remove as much as possibleSuch stains shall not be acceptable if it comes off on a white cloth rubbing – surveyor/inspectors do carry out this processVessel shall have sufficient cleaning chemical like Aquatuf available on board along with spraying equipment, chemical resistant personal protective clothes and safeguards.Vessel must have Air pressure Combi-Gun/Tobey Gun to clean such stains at higher places
26 Cargo stains of coal cargo on the end bulkhead and hopper
27 Cargo stains of coal cargo on the hopper plates
28 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO 6. Removal of tank top loose rustTank tops of bulk carriers can never stay painted as heavy bulldozers and grabs work on them.Tank top should be free of loose rust and cargo residueAny rust which can be scraped by hand scrapers should be removed. Hard adhering rust is not a hindrance to hold acceptability.The tank top should be rinsed with fresh water.
30 Tank top extensive loose rust coming up by scraping
31 PEST INFESTATION IN HOLDS 7. Presence of Insect/ Weevil/Larvae in cargo holds.If vessel had carried grain cargo in the recent past it is possible to have such live or dead insect/weevil/larvae in holdsThey are usually found at the welding seams of tank top & hopper or bulkheads, in the hold bilges upper corners, corners of frames and brackets.Crew shall look for these insect specifically and carefully after all cleaning is done.Brooms, Mops and burlaps used for preparation may also bring them in.
34 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO 8. Cleanliness of cargo hold bilgesHold bilges must be cleaned thoroughly to remove all residue, rust particles and cargo stains etc.The filter (Rose Box) must be cleaned thoroughlyThe bilge well sections shall be washed with continuous running of sea water to remove all odour and later rinsed with fresh water.The bilge well must be sponged dry to remove all trace of water and dried.
35 Hold bilge clean and dry but stains and loose flakes remains. Rose box dirty and bilge well stains remain
37 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO Hold cleaning – Best PracticesUse High pressure Air Blow from starting from top to collecting at bottom all dusty cargo residue- hold the nozzle tied to a long bamboo pole for cleaning the difficult to reach areas.Collect all sweeping of cargo residue from tank top before start of washing.Use air/water Combi -Gun (also called Tobey Gun) placed on a tri-pod stand/platform.The best results of such high pressure jet washing is obtained if followed the following procedure :
38 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO Start pointing the jet from bottom of the structure like side frames and bulkheads, slowly moving up- holding enough time at one place so that the jet of water have the chance to soften the accumulated cargo residue and dislodge them.The forceful jet acting on the surface at an acute angle will have a scraping effect. Shift the Tobey Gun platform/stand closer to the hopper edge/bulkhead to obtain the acute angle.Once the jet has reached the top of the structure, make a down sweep of the water jet to wash down all the debris which is now soft and dislodged. Patiently holding the water jet while going up and down is the key to remove all possible cargo residue from the difficult to reach areas.Operating the water jet from first upper platform of Australian ladder for removing all cargo residue from flanges of beams and girders under cross decks.
39 PREPARATION OF CARGO HOLDS FOR GRAIN CARGO When the holds are dry- all side frames, pipe guards, spiral & other ladder steps to be hit with sledge hammers- loose rust will fall down.Any loose rust areas and peeling paint need to be scraped using hand scrapersAluminum extension ladders to be used for reaching upper areas of the holds.There are some types of Aluminum light weight ladders available for the ship’s crew to reach high areas for close inspection and cleaning.Safety of crew when working aloft on these ladders is important specially when working at sea and with ship movement.Tower extension ladders with extended platform are the best and most effective.