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Ways to Differentiate Alternator, Generator & Motor

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  Content : 1) Principle Electromagnetic Induction  2) Alternator(AC only) Vs Generator(AC/DC) Vs Motor(AC/DC) 3) Brushes VS Brushless Alternator/Motor 4) Synchronous(AC) & Asynchronous Motor(AC) 5) Cylindrical & Salient Pole Rotor  1) Principle Electromagnetic Induction 1) Faraday's Law ; when there is change in magnetic flux , an electro motive force (e.m.f) is induced OR we can say Relative motion between magnet & coil induced EMF 2) Fleming rule use to determine direction of current / Right Hand Rule (motor), Left Hand Rule(generator). 3) Lenz law ; Induced EMF or Voltage  direction oppose to the cause of it (magnet motion). Lenz Law show magnetic flux/B induced , opposite to △ B that cause it. Using right hand grip onto induced B , we can determine +/-  or current poles. 4) Right Hand rule ;  By also using right hand grip rule to current coil we can determine magnetic field poles North or South Conclusion ;  1) By all of these rules we can't get somethi
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Fire Fighting Regulation By SOLAS

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For this post I would like to quote SOLAS regulation for Fire Fighting and simplified it from SOLAS Version 3 (2004), Regulation 10 and some circular form SOLAS Version 1, Regulation 4. It's my own notes, and try to understand the basics but still a lot to learn.      CONTENT: Water Supply System Consist of: 1) Fire pump 2) Fire main  3) Fire Hydrant  4) Fire Hose Note:  THE SENTENCES HIGHLIGHTED WITH YELLOW COLOUR EXPLAINED THROUGH PICTURE FROM MARINE INSIGHT,  THE SENTENCES WITH GREEN HIGHLIGHTED IS SPECIFIC FOR EMERGENCY FIRE PUMP. THE BLUE COLOUR IS FROM SOLAS VERSION 1, NOV 2000.  Fire Pump  1) Reg 10, 2.2.1 Sanitary, Ballast, Bilge or General Service may be accepted as fire pump. 2)  Reg 10, 2.2.2   Numbers of independently fire pumps........ 3) Reg 10, 2.2.3   Location  not contiguous with boundary machinery space class A, or space of main fire pump. (if not practical the common bulkhead between two space must
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Ways to differentiate purifier

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Purifier can be classified in many ways and in fact to differentiate it itself is an interesting subtopic of discussion as there are too many ways base on how we see it through the experiences, readings, personal opinions as long as it not out of topic. Into the topic.    1) Base on manufacturer (branding just like grocery)     Example, Alfa Laval P605, Mitsubishi Selfjector SJ30G(genius series) / SJ30F(future series), GEA Westfalia, Samgong, ALCAP and etc. 2) Base on it's specification (when we have to concern) Purifier Alpha Laval P605 Control by EPC-50 1300 L/Hr 9512 rpm 2.2kW (motor output) Or Mitsubishi Selfjector SJ30EH 1800 rev 4400 L/Hr 11 kW 3) Base on driver's mechanism   There are at least two very mechanical mechanisms which are by belting and gearing. This explains on how the electric motor turns the purifier from static to rated rotation speed.  Why not we directly connect the motor and purifier? L
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My Preparation for 4th Engineer Interview

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Basically this post is about the job as a 4th Engineer, This is not a complete guide but just to give ideas base on my personal opinions and what I have done in just 2 days last minute prep for my interview yeah.   The job as 4th Engineer also varies base on type of vessels, operations for cargo and machines that we encounter. Here are a my study checklists that I had prepared before went to an interview, not only to pass  but for mentally preparation  for those responsibilities. Pump alignment Bumping clearance, valve lift for compressor Rectify purifier problem and overflow preventive measure Gravity disc selection for purifier. PMS system and running hour base maintenance Screw and thread and few legs job in overhauling Watch-keeping and quick E/R round check     etc.........like boiler water test Pump Alignment Here is my simplified one. There are few methods for p/p alignment depending on availability of tools, precision base on pump size and time.
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