3515531
| Question | Answer |
| Specific heat | Ratio between amount of heat needed to raise the temp of a specified quantity of material and the amount of heat needed to raise the temp of an identical quantity of water by the same number of degrees. Water has a specific heat of 1:1 |
| Latent heat of vaporization | Amount of heat absorbed by any substance when it is converted from a liquid to a vapor. Water vaporizes at 100 degrees |
| Water expands ____ when converted to steam | 1700 times |
| Disadvantages of water (6 points) | - high surface tension - low opacity - low viscosity - conducts electricity - reacts with certain chemicals - steam can cause injury |
| Dead end hydrant | Receives water from only one direction |
| Circulating loop hydrant | When water feeds into the hydrant from 2 or more directions. Allows for higher pressure |
| How many fire hydrants are in Edmonton | 18,000 + |
| Which way do hydrants open | Counter clockwise |
| Static Pressure | Pressure of water when it is not moving |
| Normal operating pressure | Pressures within distribution system during normal consumption demands |
| Residual Pressure | Total available pressure not used to overcome friction or gravity when water is flowing throughout system |
| Flow Pressure | Forward velocity pressure at any discharge opening |
| Water hammer | the destructive forces which develop in a piping system when a column of noncompressible liquid is stopped abruptly. **The pressure exerted can be 7X or more than the static pressure. |
| What is the LPM for a Blue/Black/Silver capped hydrant | Greater than 5700 LPM |
| Green capped | 3800-5700 LPM |
| Yellow orange capped | 1900-3800 LPM |
| Red capped | Less than 1900 LPM |
| Orange service ring | Out of service |
| Green service ring | Dont use, under construction |
| Blue service ring | in use (permitted) |
| white service ring | FD use only |
| On board water capacity of Pumper | 1890 litres |
| On board water capacity of Ladder | 1134 L |
| On board water capacity of tankers | 4500 L |
| On board water capacity of Supertankers | 13,500 L |
| On board water capacity of ATP | 1142 L |
| On board water capacity of Mule trailer | 250 L |
| 44mm attack hose nozzle pressure, rated flow, and FL | NP=500kpa Flow=550lpm FL=100kpa per 15m length |
| 65mm hose nozzle pressure, rated flow, and FL | NP=500kpa Flow=950lpm FL=50kpa per length |
| What size is the jumpline and how long is it | 44mm - limited to 30m |
| How many lengths of 125mm hi vol are on each apparatus | Pump = 20 lengths Tanker = 15 Ladder = 9 Quint = 4 |
| 150mm suction hose on the pumps and tankers comes in ___m lengths | 4 or 5 meter. It is used for drafting. |
| What size of hose are found on each apparatus | Pump - all hose except for booster Ladder - 44mm,65mm,125mm Tanker and supertanker - everything ATP - Booster, 38mm, 65mm |
| What 4 kinds of hose damage are there | Mechanical, Thermal, Organic, Chemical |
| What are the hose testing pressures for the 44mm, 65mm, and 125mm? How long are the tests? | 44mm and 65mm - 1750kpa 125mm - 1400kpa Duration of 3 minutes |
| How do you start a flat load? | By placing one coupling in the front corner of the hose bed |
| What is a dutchman | Reverse bend to change direction or location of a coupling. used to avoid having the coupling flip as hose is deployed. |
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