Test of Salinity

One of the remote untoward sea-fearing during the voyage of the vessel is the seepage of saline water into the holds of ships. This risk may bring with it several problems. One of those is the danger of marine corrosion from prolonged contact with seawater and spray. Sea-goers have to be always vigilant about organic and chemical damage. The steel hulls of ships are expensive and have to be maintained well. Rust is a common enemy and eats away at the structural integrity of a vessel.
Salt in the air and water leads to chemical degradation of all exposed surfaces and also leads to the growth of corrosive organisms. If seawater seeps into the holds of ships, microbial, chemical, and physical agents may be contained in it. There are already risks from black water (sewage), great water (discard from deck drains, showers, dishwashers, and laundries), garbage, ballast water, effluent from oil/water separators, cooling water, boiler and steam generator blowdown, medical wastes (from healthcare, laboratories, and veterinary care), Industrial wastewater (from photo processing), and hazardous waste (radioactive, biological, chemical, and unwanted pharmaceuticals). Rodents, flies, and cockroaches which are reservoirs and vectors of etiological agents of many diseases are an ever-present problem. Therefore, further trouble cannot be taken on board at any cost. The problems caused by the salinity of the water that seeps into ships should be avoided at all times.
To recount few such experiences of remote possibility MSK & it’s Client has had in this regard, we can take the example of some Australian vessels which had free water in holds at the Discharge Port. The client enquired with us about the possibility of conducting tests on the salinity of that water in the apprehension whether any seawater seeped into the hatch during its voyage.
MSK performed the test on probable salinity of the free water observed inside the hatch through the Silver Nitrate test (using the AgNO3 test method).
The range of typical seawater salinity is in between 31,000mg/Kg to 38,000mg/Kg (in the form of Sodium Chloride, NaCl). The salinity of normal water is 10,000 mg/Kg.
The salinity of free water range observed inside the hatch (undergone through this test) was in between 200 mg/Kg to 1100 mg/Kg which was nowhere near the typical Sea Water Salinity & didn’t indicate the trace of sea water contamination in the cargo.
This service provided by MSK was of great help to it’s client who could then concentrate on areas that needed further attention.