- How can you lose your license? City Code
Drinking on the Job, negligence, unsafe work, signing a falsified license application for someone or failing to renew your license annually.
- What must you do if you change jobs? City Code
Notify City Hall. Also of a new address or if you retire.
- Why should you do rounds? LPB 2-3 BOW 3-4
So you can find and correct problems to prevent breakdowns. Keeping permanent records will make it easy to forecast breakdowns because you will get to know your equipment.
- What is a steam boiler? SPO 6-7-8 LPB 2-3 BOW 2-3-4
A steam boiler is a closed vessel partly filled with water, under pressure that transforms water to steam with application of heat.
- What are the requirements of a good boiler? SPO 6-7-8 BOW 2-3-4
A. D esigned to accommodate expansion and contraction B. E fficient C. A dequate steam and water space D. R esponsive to demands E. A ccessible for cleaning and repair F. S imple G. S afe
- Name and describe three types of heat transfer used in boiler operation. SPO 6-7-8 LPB 2-3 BOW 2-3-4
Radiant: Heat is transferred from a hot body to a cold body by means of direct radiation.
Conduction: Heat is transferred by physical contact.
Convection: Heat is transferred by a conveying medium, eg. (air)
- What is a combustion chamber? BOW 2-3-4
Area of the boiler where complete burning of the fuel occurs.
- What is an internally fired boiler and name four types. SP06-7-8 BOW 2-3-4
Internally fired boilers have grates and a combustion chamber enclosed within the boiler shell. A. Scotch Marine boiler B. Vertical Fire Tube boiler C. Locomotive D. Cast Iron Package boiler
- What is an externally fired boiler and name four types. SPO 6-7-8 BOW 2-3-4
Externally fired boilers have a setting, including the furnace and grates, separate and distinct from the boiler shell. A. HRT set in brick work B. Some water tube boilers C. Heine D. Stirling
- What is a crown sheet and its purpose? What is a tube sheet and its purpose? SP06-7-8 BOW 2
Crown sheet in a vertical fire tube boiler holds the tubes and thicker because it is exposed to the fire.
Tube sheet holds the tubes and does not see the fire.
- What is a water leg on a boiler? SPO 6-7-8 LPB 2-3 BOW 2-34
The space between the outer shell and the furnace shell containing boiler water. It absorbs heat that would be wasted and increases the capacity of the boiler. The surfaces are flat and must be stayed.
- Is an H.R.T. boiler set level or inclined and why? Are H.R.T. boiler tubes set level or inclined and why? SPO 6-7-8 BOW 2-3-4
Boiler is inclined 1 to 3 inches, front to rear, for drainage and removal of impurities.
Tubes are inclined with the boiler.
- Name two ways to support and take care of expansion of an H.R.T. boiler. Which way is best? SPO 6-7-8 LPB 2-3 BOW 2-3-4
- Set on saddles equipped with rollers to permit movement of the boiler as it expands and contracts.
- Suspended from hangers and supported by overhead beams.
Hanging from beams works no hardship on the furnace walls
- What is a longitudinal joint? What is a circumferential joint? SPO 6-7-8 BOW 2-3-4
Longitudinal: Seam running the length of the shell and is butt strap connected or fusion welded. Joint is above the fire line to avoid overheating.
Circumferential: A lap joint running the circumference of the shell
- What is the difference between a flue and a tube? SPO 6 BOW 2-3-4
Tube is 4” or less measured externally.
Flue is 4” or more measured internally.
- What is a dry pipe and where is it located? SPO 6-7-8 BOW 2-3-4
Dry pipe is a steam separator located within the boiler shell and connects to the steam outlet. It’s upper surface is perforated. Steam enters the perforations, rapidly changing its direction of flow before entering the steam outlet. This causes droplets and impurities to separate from the steam.
- Describe a scotch marine boiler and how it is fired? SPO 6-7 LPB 2-3BOW 2-3-4
Internally fired, self contained, horizontal return, firetube boiler. It is a cylindrical shell containing the combustion chamber and tubes that are surrounded by water.
- How is a Stirling boiler suspended? SPO 6-7-8
Lugs on the ends of the upper drums rest on the beams of its structure. The lower (Mud) drum is suspended from the tubes and is free to move by expansion.
- Describe the circulation of water within the Stirling boiler. SPO 6-7-8 BOW 2-34
Water enters the top rear drum, passes through the rear bank of tubes to the mud drum then up to the forward and center drums. Circulating tubes allow boiler water to pass between the drums. What does not go out as steam goes back down the rear tubes.
- What provisions are made for tube removal on water tube boilers?
The tubes are staggered. Some boiler tubes are left out. Sometimes every other row is omitted.
