NYC high pressure boiler license practical exam Q&A Latest

NYC high pressure boiler license practical exam Q&A Latest How do you use the bottom blow? - CORRECT ANSWER-1. Requires two people. one to operate valves, one to watch water level 2. Verify blow down tank is lined up. 3. Verify slow opening valve is closed. 4. Open (inner) Quick opening valve. 5. Then open (outer) slow opening valve for 10-15 seconds. 6. Close (outer) slow opening valve. 7. Then close(inner) quick opening valve. 8. Re-Open (outer) slow opening valve to relieve pressure. 9. Close (outer) slow opening valve. Name Boiler Safeties? - CORRECT ANSWER-1.Low water cutout 2. Vaporstat 3. High furnace pressure explosion door 4. high furnace pressure trip 5. flame detector 6. safety valves 7. fuel oil fusible link 8. pressuretrols ( low/high oil pressure) 9. proof of closure gas valve (block and bleed) 10. solenoid valves 11. non-return valve 12. high and low gas pressure switches 13. low fuel pressure 14. low atomizing air pressure 15. main gas supply low pressure What is desirable percentage of CO2,CO and O2? - CORRECT ANSWER-GAS OIL O2 1-4% 3-7% CO2 10% 12% CO 0% 0% Explain Boiler Cycle? - CORRECT ANSWER-1. System pressure drops and calls for more steam 2. Controller checks safety devices on boiler- water level, oil pressure, oil valves closed, dampers at minimum. building dampers open. 3. Controller starts Forced Draft fan with dampers at min. (draft sensed by vaporstat) 4. Controller opens dampers and purges boiler of combustible gases for predetermined period of time.