Exam Prep Flashcards
More k factor
More flow
Universal orifice
Propane and gas
Products of combustion
Co2 h2o heat
Perfect combustion
Complete combustion
Total combustion
Perfect: 1cuft ch4 10ft air
Complete: 1 cuft ch4 15 ft air
Total: 1 cuft ch4 30 ft air
Venturi definition
Low pressure high velocity
3 main categories of shut off valves
Needle ball plug
100% shut off 80% shutoff
80% shutoff has pilot on
Opening mechanism of solenoid gas valve
Electromagnetic
Opening mechanism diaphragm valve
Gas pressure
Combination gas valve
Pilot safety assembly
Appliance safety regulator
Gas valve
Redundant gas valve
100% safe
Gas water heater valve operation
As the copper expands it closes valve looks like a penis
What operates seismic valve
Shuts off gas w movement manual reset
Emergency fuel shutoff
Cable akutated
3 types of elements in gas regs
Loading
Measuring
Restrictive
Force used to lockup service regulator
Lever
What gas needs 2 stage regulator
Propane
Integral twin reg is used
Piping distances 30 ft or less
Expansion ratio
Propane
Natural gas
Water
C3h8 1:270
Ch4 1:600
Water 1:1700
Set point
Desired downstream pressure
Lockup
The pressure above setpoint that is needed to shut off tight
Droop
Downstream pressure drop below setpoint
