According to British Gas Engineers Handbook, the maximum allowed gas concentration of CO2, CO and H2S in the environment are:
A. 5000 ppm ,200 ppm and 40 ppm
B. 3000 ppm ,200 ppm and 20 ppm
C. 5000 ppm ,100 ppm and 20 ppm
D. 3000 ppm ,100 ppm and 40 ppm
Answer:C
According to British Gas Engineers Handbook, the maximum allowed gas concentration of CO2, CO and H2S in the environment are:
A. 5000 ppm ,200 ppm and 40 ppm B. 3000 ppm ,200 ppm and 20 ppm C. 5000 ppm ,100 ppm and 20 ppm D. 3000 ppm ,100 ppm and 40 ppm