Author: Amarine Antonio

Shipbuilding and welding professional.
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Questions and Answers for Marine Engineers

Amarine Antonio

Explain the term water hammer indicating possible effects on the system ? Water hammer occurs when steam is admitted into a cold pipeline. The steam condenses producing both water, and a vacuum (when the water seals the pipeline from the steam supply). This vacuum causes the water plug to be drawn into the closed end of the pipe with increasing velocity producing high impact forces on the pipework. This impact force can be high enough to rupture the pipeline. State how the risk of water hammer may be avoided ? Water hammer is avoided by slowly admitting the steam into the cold line, and draining/venting … Continue reading Questions and Answers for Marine Engineers

MACHINERY3 Comments

COLD/HOT CORROSION IN MAIN ENGINE

Amarine Antonio

There are 2 types of corrosion in Marine Diesel Engine : Cold Corrosion Hot Corrosion Cold Corrosion : JACKET WATER TEMP TOO LOW/ “EEDI” COMPILATION –> COLD CYLINDER COLD –> VAPOUR FORM + SOx –>ACID –> CORROSION Cold corrosion can be caused by low exhaust temperatures during very low load operations. Care should be taken to avoid exhaust temperature after the cylinder to drop below 250 deg C. This figure is particularly important as temperature will drop further after extraction of heat in the exhaust boiler. It’s low temperature corrosion Due to sulphur and sulphur products Source : Fuel oil … Continue reading COLD/HOT CORROSION IN MAIN ENGINE

HULL, MACHINERY, SHIP SURVEY2 Comments

SHIP ICE CLASS

Amarine Antonio

1-WHY DO SHIPS HAVE ICE CLASS? To permit the safe operation of ships in ice-covered sea areas   Visit: Shipbuilding Knowledge A-Z for more free topics on shipbuilding 2-WHO REQUIRE ICE CLASS QUALIFICATION? Coastal states with seasonal or year-round ice-covered oceans and seas Specific oceans and sea areas in the context of current and earlier commercial shipping developments for ice operation as well as applicable ice classes: BALTIC SEA: Bay and Gulf of Bothnia, Gulf of Finland – Finnish-Swedish Ice Class Rules (FSICR) Gulf of Finland (Russia territorial waters) – Russian Maritime Register (RMR) Ice Class Rules ARCTIC OCEAN: Barents, Kara, … Continue reading SHIP ICE CLASS

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List of queries

Amarine Antonio

RBI/HAZOP/HAZID. Risk assessment Testing follow guide rule. Metallurgy. WPS sample. Offshore book, corrosion book, pipeline book. Piping stress, free span. Engine problems. buttering qualify or not??? nozzle of boiler tube sheet require qualify WPS QW 288 Skew Tee joint Cu-Ni procedure WELDING REPAIR (ASME 31.3 NACE) CVN B31.3 EXEMPTION UNDERSTANDING Ship Hull Inspection PROJECT CONTROL: ITP MASTER SCHEDULE (DETAIL AND NOTE ON SYSTEM) BEFORE LAUNCHING BEFORE SEA TRIAL DELIVERY DOCUMENTATION   Continue reading List of queries