What should be CO ppm in flue gas of a gas fired furnace?
The production of carbon monoxide (CO) in the flue gases should be kept below 100-ppm air-free, even though the allowable limit in the stack is 400-ppm air-free. A burner with rising CO is far more dangerous than a stable reading because the CO could continue to rise far above dangerous levels.
What is a safe level of CO ppm?
50 parts per million
OSHA Carbon Monoxide Exposure Limits The OSHA personal exposure limit (PEL) for CO is 50 parts per million (ppm). OSHA standards prohibit worker exposure to more than 50 parts of CO gas per million parts of air averaged during an 8-hour time period. The 8-hour PEL for CO in maritime operations is also 50 ppm.
What is the maximum level of undiluted CO that is acceptable in a sample of the flue gas?
400 ppm
The ANSI Z-21 maximum CO level is 400 ppm air-free.
What should the CO reading be on a 90% furnace?
Flame stability has a lot to do with proper adjustments. You should read between 2 to 10 microamps normal is about 3 to 5.
What is the ideal CO2 content of flue gas for a gas furnace?
approximately 10%
Carbon dioxide – CO2 – is a combustion product and the content of CO2 in a flue gas is an important indication of the combustion efficiency. Optimal content of carbon dioxide CO2 after combustion is approximately 10% for natural gas and approximately 13% for lighter oils.
How do you calculate CO in a gas flue?
Total amount of dry flue gas per 1 kg wood = 4.872 m3. Therefore % CO2 = 0.97/4.872 = 19.91 assuming stoichiometric combustion (0 % O2). For 20 % excess air = 16.6 % CO2 For 40 % excess air = 14.2 % CO2 For 50 % excess air = 13.27.
Is 40 ppm CO dangerous?
Levels of carbon monoxide exposure range from low to dangerous: Low level: 50 PPM and less. Mid level: Between 51 PPM and 100 PPM. Dangerous level: Greater than 101 PPM if someone is experiencing symptoms.
Is 10 ppm of carbon monoxide dangerous?
0-9 ppm CO: no health risk; normal CO levels in air. 10-29 ppm CO: problems over long-term exposure; chronic problems such as headaches, nausea. 100+ ppm CO: severe symptoms; confusion, intense headaches; ultimately brain damage, coma, and/or death, especially at levels 300-400+ ppm.
What is the ideal CO2 content of flue gas?
Combustion converts the carbon in the fuel to CO2. For each type of fuel there is a maximum CO2 that can be converted. When you select the fuel in the analyzer, the CO2 is calculated from the fuel type by the percentage of O2 left in the flue gas. Typically for natural gas the ultimate CO2 is 11.7%.
What causes high CO in a furnace?
Holes or cracks in the exchanger can cause serious problems. Holes can allow the exhaust to enter the duct system and be distributed throughout the house. Holes and cracks can also allow air from the blower to enter the burner chamber and disrupt burner operation, increasing the amount of CO produced.
What is the standard for flue gas in a furnace?
concentrations in the flue gas ranged from 399 ppm to more than 3,400 ppm, respectively. The current ANSI Z21.47 standard (1998) requires that an air-free flue gas sample of CO not exceed a maximum of 400 ppm (0.04 percent) when a furnace vent is either partially or completely blocked. • During disconnected vent tests:
How many ppm of co are in flue gas?
„When the furnace was fired at 100,000 Btu/hr and 112,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 6 ppm to 37 ppm, respectively. When the input rate was adjusted to 118,000 Btu/hr and 128,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 99 ppm to 1,686 ppm.
What are the CO levels in a furnace?
„When the furnace was fired at 100,000 Btu/hr and 112,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 59 ppm to 545 ppm, respectively. When the input rate was adjusted to 118,000 Btu/hr and 128,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 399 ppm to more than 3,400 ppm, respectively.
What’s the legal limit for carbon monoxide ( CO )?
>2 ppm Raises questions about why CO is elevated. Source should be identified, might be normal (ie, traffic, kitchen range) (Energy Conservatory). 9 ppm The maximum allowable concentration for 8-hour period in any year, EPA (ASHRAE). Polluted cities often reach and exceed 9 ppm, increasing incidence of congestive heart failure (Morris).
concentrations in the flue gas ranged from 399 ppm to more than 3,400 ppm, respectively. The current ANSI Z21.47 standard (1998) requires that an air-free flue gas sample of CO not exceed a maximum of 400 ppm (0.04 percent) when a furnace vent is either partially or completely blocked. • During disconnected vent tests:
„When the furnace was fired at 100,000 Btu/hr and 112,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 6 ppm to 37 ppm, respectively. When the input rate was adjusted to 118,000 Btu/hr and 128,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 99 ppm to 1,686 ppm.
„When the furnace was fired at 100,000 Btu/hr and 112,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 59 ppm to 545 ppm, respectively. When the input rate was adjusted to 118,000 Btu/hr and 128,000 Btu/hr, the air-free CO concentrations in the flue gas ranged from 399 ppm to more than 3,400 ppm, respectively.
What is the average concentration of carbon monoxide in a furnace?
„Depending on the test conditions, the average steady-state concentrations of CO in the chamber ranged from 2 ppm at 100,000 Btu/hr to 159 ppm at 128,000 Btu/hr. 1 1. INTRODUCTION CPSC began a test program in 1999 to evaluate the carbon monoxide (CO) exposure hazard posed to consumers when a furnace vent pipe is blocked or disconnected.
