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Static accumulator oils may be electrostatically charged by pipeline flow. When the charged liquid flows through non-conducting flexible ship/shore connections part of the cargo may be picked up by intermediate metal flanges and other metal parts, which are in contact with the liquid inside the hose.
In order to prevent the accumulation of a dangerous voltage, [...]
Archive for the ‘Cargo Handling Systems’ Category
Electrical Continuity – Bonding and Earthing
Posted by author on June 12th, 2008
Posted in Cargo Handling Systems 
Tags: accumulation, cargoes, circumstances, cleaning machines, cloud tank, concentration, conductors, continuous path, disconnection, earth, electrical connection, electrical continuity, electrical potentials, electrostatic charge, flammable vapours, flow rates, flow velocity, gauging system, hazardous area, hazardous environment, hazardous situation, high velocity, hydrants, initial stages, insulating flange, liquid flows, liquid surface, loading method, loading rate, metal reinforcement, ohm meter, pipeline, pipeline flow, pointed ends, pumps, sounding rods, static charge, static electricity, steam cloud, steam jet, tank cleaning, tanks, ullage, water droplets 
1 Comment »Static Electricity
Posted by author on June 12th, 2008
Matter consists of equal numbers of positive and negative ions and under normal conditions is electrically neutral. This is true of oils, chemical products and other liquids. A redistribution of ions tends to occur when a liquid comes into contact with a solid, giving rise to the formation of an electric double layer where the [...]
Posted in Cargo Handling Systems Tags: cargo operations, charge separation, cleaning machines, double layer, electrical sign, electrostatic charging, high electrical conductivity, impurities, line flow, liquids, nozzle, pipe line, positive and negative ions, potential hazard, rate of flow, recombination, refined products, steam jet, tank cleaning, water droplets No Comments »Restoring Stability
Posted by author on June 12th, 2008
Intact Stability – the condition of the vessel in respect to controlled trim and list during cargo operation.
Unstable Condition – a condition that occur as a result of uncontrolled and/or unknown filling of a cargo and/or ballast tank during cargo operation. Such condition is considered to have occur if the vessel suddenly develop a list [...]
Posted in Cargo Handling Systems Tags: actual condition, ballast tank, berth, bunker tank, cargo operations, cargo loading, corrective actions, deck officer, deck officers, discrepancy, extreme caution, failure, free surface, moorings, sequence of operation, slack, stability criteria, surface effect, tank levels, tank valves, uneven distribution, unstable condition, void space No Comments »SHIP/SHORE CHECKLIST
Posted by author on June 6th, 2008
Instructions for Completion
The safety operations require that all questions should be answered affirmatively YES/NO. If an affirmative answer is not possible, the reason should be given and agreement reached upon appropriate precautions to be taken between the ship and the terminal. Where any question is not considered to be applicable, a note to that effect [...]
Cargo Ventilation System
Posted by author on May 7th, 2008
Cargo Tank Vent Systems
All Cargo Tanks should be provided with a pressure relief system appropriate to the design of the cargo containment system and the cargo being carried.
Posted in Cargo Handling Systems Tags: breaking the seal, cargo control, cargo tank, Cargo Tank Vent Systems, cargo tanks, CARGO TANKS RELIEF VALVES, clear water, containment system, DECK PURGING TANK RELIEF VALVES, design capabilities, design pilot, domes, drains, EXPANSION BELOWS, logbook, m3, piping, Pressure Relief System, pressure relief valves, relief valve, safety relief valves, stacks, tank design, vapor pressure, VENT MAST, vent systems 2 Comments »
