HKIE Professional Assessment - Control, Automation & Instrumentation Discipline case studies
HKIE Professional Assessment - Control, Automation & Instrumentation Discipline · Put your knowledge to work in context.
The HKIE Professional Assessment in the Control, Automation and Instrumentation (CAI) discipline is the route by which engineers in Hong Kong demonstrate that they can practise at professional level in this field. It is aimed at graduates working in process control, industrial automation, instrumentation and safety-related systems who are ready to be assessed against the standard of a chartered-level engineer. The HKIE Professional Assessment - Control, Automation & Instrumentation Discipline case studies are 5 cases and about 6,279 words.
1Level loop cycling on a CIP balance tank - tuning, stiction or measurement?
A beverage bottling plant in Tsuen Wan reports a persistent level oscillation on a 10 m3 CIP balance tank. Level is measured by a 24 GHz radar transmitter (4-20 mA, 2 s damping) and controlled by an S7-1200 PID driving a 2-inch equal-percentage globe valve with a smart electro-pneumatic positioner.
1,144 words, about 6 min2Steam flow reads high at part load - impulse line condensate or a worn orifice plate?
At a food plant, saturated steam at 1.0 MPa(g) is measured by an orifice plate with a DP transmitter ranged 0-100 kPa, which the flow computer square-roots and scales to 0-20 t/h. Both impulse lines run to condensate pots and the transmitter sits 600 mm below the taps.
1,243 words, about 6 min3LPG high-pressure shutdown - can a proof-test interval be extended and the SIL 2 claim sustained?
An LPG storage and cylinder-filling depot in Tuen Mun has two 100 m3 bullets protected by a high-pressure shutdown function. A 2019 LOPA set the requirement at SIL 2 (PFDavg 0.01 to 0.001).
1,233 words, about 6 min4Broadcast storm at a sewage pumping network - root cause and the control gaps behind it
A Hong Kong sewage pumping station network comprises 22 unmanned stations linked by a private fibre ring to a central control room. Each station has a PLC that reports over Modbus TCP to the SCADA server, and pump start and stop is decided centrally.
1,315 words, about 7 min5Hospital theatre pressurisation at handover - certifying under commercial pressure
You are the control and instrumentation lead for a consulting engineer on a new 12-theatre block at a private hospital. The contract requires each operating theatre to be held at +15 Pa relative to the corridor, monitored by a BACnet DDC system with room pressure sensors and an alarm to the nurse station.
1,344 words, about 7 min