Stationary Engineer Exam Study Guide

Stationary Engineer Exam Study Guide How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of steam? - 7 feet On a gas fired boiler what is the proper gas to air mixture - 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? - 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? - Once a Shift With 24 hr operation how often do you check the water level? - Once per shift How often do you check the LWCO? - Once per shift How often do you check the High Limit Switch? - 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? - GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG What controls the amount of blowback on a safety valve? - Blowback ring or adjusting ring On a open air expansion tank hot water boiler system; how high should it be mounted? - (4 Feet ) above the highest heating element. What is the minimum top clearance of boilers with manholes? - 5 feet Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of? - 2 feet from ceiling. Code chapter 10 page76 Most important safety device on a boiler? - Safety relief valve What does a Black Liquor Boiler do? - Black Liquor is the by product of wood pulp processing in the paper making industry. What does Black liquor boiler known for? - Steam generation and recovery of soda ash Maximum line voltage for control on a boiler? - 150 volts Under what code are boilers designed and constructed? - ASME- CSD 1 How many low water cut offs are needed per code for a hot water system when a boiler has inputs greater than 400,000 btu per hr - 1 LWCO is needed. What is the minimum and maximum size for a safety valve per code for boilers? - Minimum 3/4" and Maximum 4 1/2" What stamp is put on a boiler after repairs? - "R" What is the equalizing system used for? - The equalizing system is for warming up the steam lead. A blowdown valve is located at the lowest water space of a boiler for three purposes - 1. to remove precipitated sludge or loose scale n2. To permit rapid lowering of the boiler water if it has become too high accidentally n3. As a means of removing water from the boiler so that fresh water may be added to keep the concentration of solids below the point where difficulties may be experienced. In the old power boiler which type of feed-water regulators were not used? - Electronic After opening a boiler for repairs how much oxygen is needed? - 19% What is the first thing you do when shutting down a boiler? - Turn off (extinguish fire) What is the legal limit of acceptable asbestos particles ? - 0.1 fibers per cubic centimeter What is CREEP? - Creep is defined as the slow deformation of material with time; with the deformation taking place at elevated temperatures with no increase in stress. What is the BTU content of Anthracite coal?