The app uses FL=C*GPM²*L.
*All hose lengths are in 100' segments no 50' lengths*
I need your suggestions to make the app better! Please comment!
The total pressure loss in the system results from the combined losses due to friction in length of pipe and friction losses due to valves, fittings, and other components. The first are "major losses" associated with energy loss per length of pipe, and seconds are "minor losses" associated with bends, fittings, valves, etc.
The factors that determine friction losses in pipe are:
The velocity of the water: As velocity increases, pressure losses increase. Velocity is directly related to flow rate.
The size (inside diameter) of the pipe: Smaller pipe causes a greater proportion of the water to be in contact with the pipe, which creates friction. Pipe size also affects velocity. Given a constant flow rate, decreasing pipe size increases the water’s velocity, which increases friction.
The roughness of the inside of the pipe: Pipe inside wall roughness is rated by a C factor, which can be selected depending on material of pipe. The lower the C value, the rougher the inside and the more pressure loss due to friction.
The length of the pipe: The friction losses are cumulative as the water travels through the length of pipe. The greater the distance, the greater the friction losses will be.
The friction losses for, elbows, and tees can also be selected. The friction losses in fittings such as couplings, elbows, tees, valves and other elements play a role. Friction loss from these components must be taken into account when calculating friction losses for each section of pipe.
Calculation of friction factor is based on the Hazen-Williams equation. Local resistances factor K for valves and some fittings (tees, elbows, pipes contraction and enlargement), can be found in app itself.
Calculate pressure losses in a pumping of 10 l / s. The diameter of the suction and discharge is 100 mm or 4 ". We have the following items on the Suction: 1 foot valve, 1 gate valve , 1 elbow 90, 1 contraction to 3" to entering the pump. In the discharge we have: 1 expansion, 2 elbow 90,
a check valve, 1 gate valve. The total pipe length is 10 meters in diameter of 100 mm. Must be calculated the pressure losses for the given flow.
Version 2.0 - Includes a Friction Loss Calculator. The calculation is based on a fire hose diameter, fire hose length and GPM.
Version 3.0 - Removed adds and making it a paid for app so I can afford to continue development for the app.
Developed for you by SpotFire to make life a bit easier for wildland firefighters.
To use this app, you need Fahrenheit and Feet for your units. Input your Air Temp, Wet Bulb Temp, and Elevation and mash the button, your RH Value as a percentage will appear on the screen. Simple as that.
Thank you for your feedback.
This app has NO ads, NO permissions and requires NO network connection once installed.
The RH CALC is also available in the SpotFire IRPG and SpotFire IRPG-FULL
Keywords: Firefighter Professional, Wildland fire, Search and Rescue, EMS, First Responders, Law Enforcement, Police, Sheriff, Deputy, Volunteer, National Guard, Spot Weather, Forecast, Meteorologist, Science, Home Owner, General interest.
*** The new version of the Fire Weather Calculator includes ANONYMOUS sharing of weather observations with researchers at the University of Montana. The anonymous observations will be used to support research in weather prediction, analysis, and content display. Data shared with UM will only contain data fields from the app (photos are excluded) and a device ID (to differentiate between users). No personal information is shared. We ask that you "opt-in" to anonymous sharing in order to support these research projects. Anonymous sharing can be changed any time in the "Settings" page of the app. Thank you! ***
This application allows quick calculation of RH, Fine Dead Fuel Moisture (FDFM), and Probability of Ignition (PIG) based on standard fire line weather observations.
The app also provides means of archiving AND sharing those observations through other core Android functionality such as email, Dropbox, and Google Drive.
Partial form submissions are allowed (and can be archived and shared), but entire form must be filled in to calculate FDFM and PIG.
Bulk submission of multiple observations are now done on first page of app.
This is a beta release. Please forward questions to email listed below.
Developed by The National Center for Landscape Fire Analysis, College of Forestry and Conservation, University of Montana.
* For tips and hints, please visit our blog: http://firecenter.umt.edu/content/android-app-weather-calculator-tips