HKIE Professional Assessment - Mechanical Discipline case studies
HKIE Professional Assessment - Mechanical Discipline · Put your knowledge to work in context.
The HKIE Professional Assessment - Mechanical Discipline is the route by which a graduate engineer in Hong Kong demonstrates readiness for Corporate Membership of the Hong Kong Institution of Engineers and, through it, for registration as a professional engineer. Candidates are typically mechanical engineering graduates who have completed a period of recognised training and are now presenting their training and experience report, sitting a written assessment, and attending a professional interview. The HKIE Professional Assessment - Mechanical Discipline case studies are 5 cases and about 3,960 words.
1Variable-speed retrofit triggers a structural resonance in a chilled-water pump
A hotel plant room in Kowloon contains three vertical in-line chilled-water pumps, each directly coupled to a 2-pole induction motor rated 2,950 r/min at 50 Hz and controlled by a variable-speed drive installed during a recent retrofit. The drives float the duty pump between 38 and 50 Hz to hold a differential-pressure setpoint of 180 kPa across the secondary loop.
804 words, about 4 min2Seawater cooling circuit: 316L failure and a proposed duplex substitution
A coastal data centre in Tseung Kwan O uses once-through seawater cooling. Titanium plate heat exchangers transfer heat from a closed chilled-water loop to seawater drawn from a nearby intake.
772 words, about 4 min3Part-load chiller trips and a fresh-air cutback in a Grade A office tower
A 28-storey Grade A office tower in Quarry Bay is served by two 500 RT water-cooled centrifugal chillers with variable-speed drives, designed for 6.5 °C/13 °C chilled water with variable primary flow. The lead chiller runs alone until it reaches 85% of design current before the second chiller is enabled.
803 words, about 4 min4Lifting incident during rooftop AHU replacement: notifications, causation and controls
At a hospital redevelopment site in Kowloon, an 1,800 kg rooftop air-handling unit was being lifted 3 m by a 2 t chain block suspended from a rolled-steel purlin that no structural engineer had checked. The lift plan was a hand sketch; no shackle was used at the purlin and the top hook was hooked over the flange; the signalman was also acting as banksman.
741 words, about 4 min5Extension-of-time claim and pressure to certify a convenient number
You are the mechanical lead of the consultant team on a HK$1.4 billion hospital redevelopment under a re-measurement contract. The main contractor has submitted an extension-of-time claim of 45 days for late handover of the electrical plant room (30 days), late approval of chiller shop drawings (20 days), and two black rainstorm days.
840 words, about 4 min