Chemical Tankers / Day 2 / Day 2 Topic 5 Cargo Hoses & Pipelines
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Cargo hoses and pipe lines.
Cargo hoses and pipe lines.
Cargo hoses and pipe lines.
Manufacturers
Resistancy List
Cargo hoses and pipe lines.
Size:
Ship’s manifold connections are usually 4”,6” or 8”. Shore connections are broadly the same. We would prefer not to use a 6” hose to connect between two 4” manifolds
If you are going to have a lot of hose rigging, consideration needs to be given to hose sizes at the planning stage, in order to optimize the use of hoses, reducers, etc.
Cargo hoses and pipe lines.
We should also consider length - some ships are lucky enough to have a number of short 3m length hoses, which are ideal for loops on internal rigging. On the other hand, if we are making a connection direct to a Pump stack, we are usually looking for the longest possible single length (or several standard 6m lengths joined together). Rigid bends can also be incorporated.
Good planning and Preparation are essential.
Cargo hoses and pipe lines.
Cleanliness:
A dirty or wet hose will put a cargo “off-spec”. If the hose is in the middle of a multi-hose rig, it will be almost impossible to trace the source from the one or more foot samples affected.
Several terminals require pre-inspection of cargo hoses and will ask you to leave one end disconnected for this purpose.
Cargo hoses and pipe lines.
Good cleaning and storage will minimize potential problems. A rack, hose box or container is ideal and end-covers should be used to prevent dust, water, etc from being blown into clean hoses. If a hose has been lying for some time, it must be re-inspected, especially to check for moisture lying in the internal ribbing of the hose (blow with dry air or Nitrogen to remove).
Cargo hoses and pipe lines.
If you receive instructions to make or supervise a new hose connection, you must inspect the hose to ensure it is clean and dry.
Hoses must be prepared to the same standard of cleanliness as the tank receiving the cargo, e.g. water white or wall wash. Recommendations on cleaning of hoses may be found in makers instructions, in particular warning regarding damage due to excessive steaming or use of cleaning products which are not stated on the resistancy list.
Cargo hoses and pipe lines.
Certification and Marking:
Cargo hoses must be pressure tested annually (or if C/P required to be send ashore) and, as a Deck Officer, you may be called on to assist with onboard tests. A valid certificate must be displayed to indicate those hoses which met the test criteria. Hoses are supplied to the ship with a manufacturer’s certificate but subsequent annual tests are conducted on board.
Cargo hoses and pipe lines.
Details of hose testing and marking are contained in the Chemical Tanker Manual, section 12.23 but in general it requires a hydrostatic test to 1.5 times normal working pressure.