Exam (elaborations) Stationary Engineer

ow much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of steam? - ANSWER 7 feet On a gas fired boiler what is the proper gas to air mixture - ANSWER 30%-70% and in special arrangements it can be as high as 100% . ANSWER CHAPTER 11 remember% What is the total hardness in a system that was found to have calcium hardness of 60ppm and magnesium hardness of 18ppm and carbon hardness of 12 ppm? - ANSWER TH=(Ca x 2.5) + (Mg x 4.1)nTH=(60 x 2.5) + (18 x 4.1)nTH= 150+73.8 =( 223.8 PPM) How often should a complete external inspection of the boiler be done? - ANSWER Once a Shift With 24 hr operation how often do you check the water level? - ANSWER Once per shift How often do you check the LWCO? - ANSWER Once per shift How often do you check the High Limit Switch? - ANSWER Annually A 2" pipe was found to be delivering water at 100 psia at 1040ft per second. How many gallons per hour will it deliver? - ANSWER GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG What controls the amount of blowback on a safety valve? - ANSWER Blowback ring or adjusting ring On a open air expansion tank hot water boiler system; how high should it be mounted? - ANSWER (4 Feet ) above the highest heating element.