Hydronic Heating Boilers Flashcards
What is the maximum temperature for a low temperature hot water boiler?
120 c
250 f
What is the maximum pressure for a low temperature hot water boiler?
1100 kPa or 160 psig
How are low temperature hot water boilers rated?
BTUH or EDR
Are low temperature hot water boilers net or gross rated?
Net
What section of the ASME do low temperature boilers comply with?
4
What is the lower temperature that high temperature hot water boilers may exceede?
120 c
250 f
What is the upper pressure limit for a heigh temperature hot water boiler?
There is none
How are high temperature hot water boilers rated?
MBH or BHP
Are high temperature hot water boilers net or gross rated?
Gross
With what section of the ASME must heigh temperature hot water boilers comply?
1
In what 3 ways are boilers rated?
Input
Gross output
Net rating
How many BTU’s dose it take to raise one pound of water one degree Fahrenheit?
1
One Boiler Horse Power (BHP) will evaporate how many pounds of water per hour?
34.5
What dose input represent in a boiler consumption?
Amount of heat in the fuel burned by the burner.
Name 4 types of boilers.
Fire tube
Water tube
Cast iron sectional
Condensing
In a fire tube boiler what surrounds the tubes?
Water.
In a water tube boiler what is in the tubes?
Water.
Cast iron is an excellent material for the construction of sectional boilers. Why?
Natural corrosion resistance provides them a long life span with minimal maintenance.
Do cast iron sectionals hold more or less fluid than their copper and steel counterparts?
Much more volume of fluid.
What are the 2 categories of cast iron sectional boilers?
Vertical
Horizontal
What are horizontal cast iron sectional boilers also called?
Pancake boiler
In a condensing boiler what is the heat exchanger made from?
Stainless steel
Condensing boilers operate with a high or low temperature return?
Low
Both water and fire tube boilers use steel heat exchangers.
True or False?
True
Water tube boilers use only copper tube heat exchangers.
True or False?
True
Name 2 high mass boilers.
Fire tube
Cast iron sectional
Name 2 low mass boilers
Water tube
Condensing
Which type of boiler uses tie rods and push nipples for assembly?
Cast iron sectional
What is the major disadvantage of a high mass boiler?
Slow recovery
Potential for explosion
What is the first process before installation of a boiler?
Inspect unit for damage
What 2 types of air supply must be supplied for proper installation?
Combustion and ventilation
Which section of the ASME contains rules for care and operation of heating boilers?
6
Why could be the result of low fluid pressure in a boiler?
Lead to no fluid and boiler not firing
If you find fluid leaking past the pressure relief valve what is the first thing to check?
Pressure in boiler
What should be checked on the combustion air inlet?
Free from obstruction and dirt.
What is the BTU value of an EDR?
Steam 240 btu/h
Hot water 150 btu/h
What problem will occur in a conventional boiler if the flue gases are cooled to their dew point?
Draft hood spillage or damage caused by corrosive condensate.
Which is classified as a high mass boiler?
Copper tube
Steel water tube
Copper tube for domestic water supply
Cast iron sectional
Cast iron sectional
What code covers the fabrication, installation, and inspection of boilers?
ASME code
What does ASME stand for?
American Society of Mechanical Engineers
Which of these boilers can be used to directly heat domestic water?
Cast iron sectional
Steel fire tube
Cast iron condensing
Copper water tube
Copper water tube
How would you classify a fire tube boiler?
High Mass
What can cause coil damage in a low mass boiler?
Low or no flow through the heat exchanger.
What material is commonly used to construct sectional boilers?
Cast iron
What is the purpose of the safety relief valve?
To protect the boiler system from excess pressure.
When installing a boiler where would you find the clearance to combustibles?
Appliance rating plate.
When providing a maintenance check you find a low mass boiler with excessive noise and popping sounds. What could this indicate?
Low flow condition.
When checking the combustion air and venting system of a high efficient boiler, you notice the termination is covered in ice. What should be done?
Remove the ice and snow and any debris .
Incomplete combustion will cause a carbon build up on the fins of the exchanger. Who should be consulted?
Gasfitter
