The monitoring equipment for leakage of flammable gas (Gas Detector) installed within the area of the storage tank of the new. The alarm signal to the control room. When it was found that there was a leak of flammable gas in tank area So the staff to check and closed control valves. Monitoring equipment installed by leakage will alert level 2 value including the alert level value 1 which equal to the 10%. ELE 0.18 ppm and the alert level value 2 which equal to the 25% of ELE 0.45 ppm.