ISA CCST Level III case studies
ISA CCST Level III · Put your knowledge to work in context.
The ISA Certified Control Systems Technician (CCST) Master - Level 3 is the highest of the three CCST certification levels. It is aimed at experienced automation and control technicians who already demonstrate the calibration, maintenance, repair, and troubleshooting knowledge tested at Level 1, and the broader process-control and project knowledge associated with Level 2, and who now carry administration, supervision, or management responsibility. The ISA CCST Level III case studies are 5 cases and about 3,416 words.
1Wet-Leg Temperature Error on a Deaerator Level Loop
At a combined-cycle plant, a smart DP transmitter measures level in a deaerator storage tank. The transmitter is ranged −200 to −100 inH2O, with a 200 in wet leg filled with silicone oil (density 1.07 g/cm³ at 20 °C, volumetric expansion about 0.0011/°C).
738 words, about 4 min2Flow Loop Cycling After a Control Valve Replacement
A hydrocracker charge-flow loop uses a 6 in equal-percentage ball valve, a 4–20 mA positioner, and a 0–120 t/h magnetic flowmeter. After the original butterfly valve was replaced with the ball valve, the flow oscillates ±12% at about 0.25 Hz.
731 words, about 4 min3Loop-Check Sign-Off Under Schedule Pressure
A greenfield 25 MGD wastewater plant is in commissioning. The loop-check package has 80 loops; 15 analog loops and 6 control valves cannot be stroked because the plant air compressor has not been commissioned.
654 words, about 3 min4Blanket Calibration Interval Extension
The instrument maintenance budget at a 300-person refinery is cut 18%. The reliability engineer proposes extending the calibration interval for all 420 smart transmitters from 12 to 24 months, saving about $95,000/year.
633 words, about 3 min5Nonlinear pH Control Loop Cycling
A municipal wastewater plant uses two-stage pH neutralization. Influent pH swings between 2 and 11 at 800 gpm; 93% sulfuric acid and 25% caustic are added.
660 words, about 3 min