1. R. J. Jones 5930 Bandini Blvd. Los Angeles, CA., 90040 323-727-9800

2. Overview
A discussion of basic definitions and the various types of boilers commonly found in use today
Advantages and disadvantages
Governing Codes
Selection criteria
Applications .

3. Definition of a Boiler A device for generating steam or hot water
Designed to transmit heat from an external combustion source to a fluid contained in the boiler
Contained/controlled combustion
Boiler HP = output of 33,482 BTU/Hr.
Boiler HP = 34.5 lbs/hr evaporation of water
Low pressure or High pressure

4. TYPES OF BOILERS
Thrust of our discussion will focus on most commonly encountered boilers - below 8,000,000 btuh
- commonly referred to as “Package Boilers”

5. TYPES OF BOILERS Field erected built in place at job site
usually above 20,000,000 btuh
typical of power generation plants or very large industrial application or a central plant

6. FIRETUBE TYPE FIRE IN TUBES WATER IN VESSEL SURROUNDING TUBES
TYPICAL EXAMPLES
Cleaver Brooks
Superior
Nebraska

7. FIRETUBE TYPE
CLEAVER BROOKS

8. FIRETUBE TYPE -ADVANTAGES
CAN HANDLE LARGE INSTANEOUS DRAWS WELL
POTENTIAL FOR GOOD EFFICIENCY
NOT PARTICULARLY PRONE TO SCALING

9. FIRETUBE TYPE -DISADVANTAGES
LARGE VOLUME OF WATER TO HEAT UP FROM A COLD START
STRAIGHT TUBES EXPAND --CAN LEAK IF BOILER IS CYCLED FROM COLD OR IS THERMALLY SHOCKED
IF HEAVY SCALING OCCURS, EXPENSIVE OR IMPOSSIBLE TO REPAIR
LARGE VOLUME OF WATER AT ELEVATED TEMPERATURE AND PRESSURE

10. WATER TUBE TYPE Water inside tubes Fire surrounds tubes Typical types
in Combustion Chamber
Typical types
Parker
Bryan
Ajax

11. WATERTUBE TYPES

12. Straight watertube

13. ADVANTAGES - WATERTUBE TYPE
Quick heat up time
Some designs handle Thermal Shock well
Small water volume

14. DISADVANTAGES - WATERTUBE TYPE
Can scale slightly sooner in steam service
Must be sized for instantaneous loads

15. CAST IRON SECTIONAL

16. Cast Iron Sectional

17. CAST IRON SECTIONAL TYPE
Assembled of pancake-like sections
Cast iron material
Factory or Field assembled
Rope gasket seals between sections
Draw rods hold sections together
Typical = Weil McLain, Peerless,
H .B. Smith

18. ADVANTAGES - CAST IRON TYPE
Tend to last a long time in most applications
Can operate with little water treatment
Can operate with some scale buildup

19. DISADVANTAGES - CAST IRON TYPE
Cast iron is brittle
Susceptible to Thermal Shock
Severe Damage and Cracked Sections
Leaks between sections
Limited Pressure and Temperature
15 PSI Steam
75 PSI Hot Water
ASME Section 4 only