804 Natural Gas and Carbon Dioxide Flashcards
What are the pressures of Natural gas lines?
High Pressure NTS 85 Bar Natural Transmission System
Medium Pressure LDZ 25 Bar Local Distribution Zones
Local Domestic 1 Bar
What is added to gas to make it easily detectable?
Ethyl mercaptan stenching agent Explosive range 2.8-18.2% yellopw colour toxic to the environment
Who is primarily responsible for Gas Leaks?
GA gas authority
How long can it take to shut off a high pressure gas system?
Upto an hour due to Staging down of pressure
How are wind directions quoted?
Wind directions are always quoted as the direction the wind is coming from.
What is the PDA for a natural gas leak?
1 Pump
How far should an appliance be parked from a suspected gas leak?
25m not in direct sight, at a 45 degree angle
NTS and LDZ Hazard Zones?
200m High/medium pressure, BA full PPE
600m Congested conditions
1000m uncontrolled leak from a mass storage site
Hazard zone for a domestic gas leak?
25m
What are L1 and L2 Carbon monoxide incidents?
L1 - CO detector actuating, GA must be requested, BA must be worn when shutting off supply
L2 - CO incidents where a suspected large release or persons trapped
What can be used to monitor the atmosphere at a suspected gas leak?
RRT or FIT with DIM equipment
When the gas supply has been cut of either before arrival of the brigade or by brigade personnel, what should be used?
A tag form 5288 should be attached to the valve and the GA informed
