PEB Singapore PPE Mechanical case studies
PEB Singapore PPE Mechanical · Put your knowledge to work in context.
The Professional Practice Examination (Mechanical Engineering) is the written stage that the Professional Engineers Board, Singapore, sets for engineers seeking registration as a Professional Engineer in the mechanical branch. It is not a replay of a university syllabus. The PEB Singapore PPE Mechanical case studies are 5 cases and about 4,497 words.
1Uprating an Ageing Air Receiver: Code Thickness Versus Local Pitting
A plant owner wants to raise the compressed-air header from 8 to 10 barg and has asked you to endorse the existing vertical receiver for the higher pressure. The records show: shell to SA-516 Gr 70, outside diameter 1219 mm, nominal thickness 9.5 mm, longitudinal seam spot-radiographed (joint efficiency 0.85), allowable stress 138 MPa, built in 2004 with a 1.5 mm corrosion allowance.
843 words, about 4 min2Warm Upper Floors and a Low Plant Delta-T: Capacity or Distribution?
A 12-storey office tower has levels 5–8 served by one AHU, design 24,000 m³/h through a 105 kW chilled-water coil at 7/12.5 °C, with two-way control valves throughout. Occupants on the upper floors complain of afternoon heat and stuffiness.
900 words, about 5 min3Batch Reactor Scale-Up: Fire-Case Relief Is Not the Governing Scenario
A batch reactor of 6.0 m³ working volume is charged with 4,500 kg of reaction mass of specific heat 3.2 kJ/(kg·K). Normal operating temperature is 70 °C on jacket steam at 6 barg.
895 words, about 4 min4Concurrent Delay, Liquidated Damages and an Instruction to Withhold Certification
You are the Engineer's representative on an S 18 million PSSCOC contract for the ACMV upgrade of an operating hospital. Completion is 30 June, liquidated damages S 30,000/day.
945 words, about 5 min5Chiller Replacement Economics: Which kW/RT Are You Actually Buying?
An office owner's metered chiller-plant energy is 1.90 GWh over a 3,600-hour year at an average load of 620 RT, with electricity at S 0.26/kWh. The plant is three 400 RT water-cooled screw chillers (two duty), constant-speed primary pumps and fixed-speed cooling towers, with an implied plant performance of 0.85 kW/RT (chillers about 0.68, pumps 0.11, towers 0.06).
914 words, about 5 min