MEOclassIIexamnotes

The working pressures in case of jacket water system or lubricating oil system are usually of higher pressure than sea water system. If the leakage takes place in the jacket cooling water side or lubricating oil side, the flow from any point of leakage is in to the sea water side of the cooler. If the leakage is heavy then, usual indication is loss of jacket cooling water or lubricating oil. Procedure: Ensure the end covers are removed from the sea water box side and secure the tube stack by dog clamp arrangement-tube stack should not be disturbed when shell is under pressure. • Clean the sea water side of the cooler. • Start the fresh water cooling pump or lubricating oil pump. • Let the fluid circulate through the cooler spaces on the outside of the tubes. • Leakage within the tubes or at the junction of the tube plate will show up as liquid trickling. • Identify the tube which is leaking. It is a time consuming procedure so be patient. Fluorescent Halo Test Small leaks are extremely...

 Testing Compressor Discharge Valves Close the liquid valve in the receiver outlet and collect the refrigerant. The compressor will stop on LP trip. Shut the suction and discharge valves quickly. Observe the suction and discharge pressure gauges. If the discharge pressure falls roughly by 1 bar and above in five minutes and simultaneously if suction pressure rises, then the discharge valve is leaking. Testing of Compressor Suction Valve Run the compressor under manual control. Close the suction valve slowly to prevent foaming of lubricating oil in the crankcase. With the suction valves shut, the compressor should develop a vacuum of 0.4 bar or more. This indicates the suction valves are ‘holding’ and functioning correctly.

 The procedure refers to purging of air from 4 ram type steering gear system: Carry out the system isolation as mentioned before. In case of hydraulic ram type steering gear, the casing and the sump should be maintained with 75% of its capacity. Turning bar inserted in the holes of flexible coupling between motor and pump. The air release purge screws on the cylinders are then opened partially. Use correct allen key. The pump put on stroke by pressing the end button of the bi-directional valve. The gear is slowly moved from one direction to another. Ram movement should be on both sides. The level in the tank should start to fall. Air free or bubble free liquid should escape through air release valves. Stop pressing the end button of the bi-directional valve and stop turning the pump. Switch on the breaker and Start the electric motor. Put the switch on local. Under local control, use bi directional valve to move the gear should be moved from one side to another. The air release on ...

Increased efficiency due to the longer length allowed for the flame giving more time for complete combustion. This also allows more heat to be released as radiant rather than convective cutting down the required number of screen wall generating tubes. The longer period allowed for complete combustion means that less excess air is required, this has the knock on effect of lowering the Dew Point of the flue gasses. Better gas flow.  Better flame propagation  Maximum utilization of heat  Easy maintenance Lower furnace exit gas temperature

Fire detection system    BANWAS back up source   Automatic telephone exchange backup source   Common battery telephone   Echo sounder power fail monitoring   Battery charging etc.

The Elcometer range of digital coating thickness gauges has been specifically designed to provide highly accurate, reliable and repeatable coating thickness measurements on almost any substrate, whether ferrous or non-ferrous.  Dry Film Thickness can be measured on either magnetic steel surfaces or non-magnetic metal surfaces such as stainless steel or aluminium using a digital coating thickness gauge.  The principle of electromagnetic induction is used for non-magnetic coatings on magnetic substrates such as steel.  The eddy current principle is used for non-conductive coatings on non-ferrous metals substrates.

Scavenging in AE is mostly done by piston during exhaust stroke so excess air pressure is boost pressure whereas in ME it's done by air pressure only hence scavenge pressure.