ACCELERATORS: On-Demand These one-hour on-demand courses are a fast and convenient way to learn current trends and skills for immediate on-the-job application. Water shrubbery outside of the peak demand hours of 5:00 a. Public consultation is a major element of the consents process in most Member States. • Recent trends. The officer as well as the pump operator need to know the GPM flow from different nozzle tips to know how much fire each can extinguish. 03/01/13 Risk Rating New Accounts. In the demand analysis, other use than domestic needs to be considered, such as the water use in institutions (a hospital bed requires 100 l/bed/day-night at minimum), use for livestock and for gardening. v) Auto generates long. Discharge coefficients for the four orifice types are built into the calculation. A detailed description of this data is presented later in this study. Knowing the fuel consumption of your oil-burning furnace can tell you how long a tank of fuel oil will last. Replacement of stored water with fresh water should be necessary only if the stored water becomes contaminated in some way or if the container should begin to leak. 320(19) storage requirements apply. • Arrive at a design example for a 200 bed NHS long stay hospital. (3) For Hotels/Motels with commercial space, the water demand will be based on the commercial area-based demand factor for the hotel's/motel's parcel area, plus 125 gpd/room.
provide a description of water, wastewater, and stormwater needs, as well as water resource demand calculations for the plan. From fire flow and constituent concentration analyses, to energy cost. types of spreadsheet. 1 POPULATION PROJECTIONS. · Data input (GIS) - network details, elevations, demand nodes · Modelling outputs (normal service and fire conditions) · Colour coded site plans indicating pressure Water Quality · WQ results of existing monitoring programs and ad-hoc testing. 1, water calculations shall list restaurants space use separate from retail. NFPA-13D, Section 8. Break-even point analysis is a measurement system that calculates the margin of safety by comparing the amount of revenues or units that must be sold to cover fixed and variable costs associated with making the sales. water, sewerage, waste disposal, fire certification, gas, electricity and highways rights. This property does not have any onsite fire protection requirements served through the domestic meter. Here is a four-step process on how to calculate the room CFM: Step One – Use the above Air Changes per Hour Table to identify the required air changes needed for the use of the room. The Spreadsheet calculates the minimum size of a VTA to balance both the site's contributing water runoff and delivered nutrients. Creating a visual representation of their planned work vs. 1 lnstantaneous demand 32 2. During the drier months, when demand on the water system is high, rates will increase by about 25%, to reflect the added cost of supplying water to the city. thus assuring the correct selection of the final a. The actual, realized electric power demand of the building may differ up to approximately 25% compared to the results calculated here.
that works out to a 360,000 gallon tank. The amount of parallel fire flow calculations can now be selected by going to Tools > Options > Engine tab. A BTU, or British Thermal Unit, is the quantity of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Flow location. The calculations and tables contained within are obtained from the ISO's Guide For Determination of Needed Fire Flow, Edition 05-2006. The Needed Fire Flow (NFF) for commercial occupancies protected by an automatic fire sprinkler system installed in accordance with the general criteria of NFPA 13, Standard for Installation of Sprinkler Systems, is the demand at the base of the automatic sprinkler riser and inside/outside hose stream demand. mains water flow rate calculator. txt) or read online for free. fire and rescue services will have different nexus of benefits criteria than roads. In the demand analysis, other use than domestic needs to be considered, such as the water use in institutions (a hospital bed requires 100 l/bed/day-night at minimum), use for livestock and for gardening. Fire sprinkler systems hydraulic calculations. The ratio of the maximum coincident demand of a system, or part of a system, to the total connected load of the system. Water treatment plant capacity calculation begins with demin water demand, potable water demand, utility water demand, and the last is raw water demand. This is because the high-pressure steam in firetube units is contained by the boiler walls rather than by. Installing an alternate fuel consuming product for hot water production would be ill advised because of the small amount of water use the facility uses. This causes a shock wave which starts at the valve or pump and passes along the pipe, changing the fluid velocity as it goes. Variable Frequency Drive Energy Savings Calculator The most common applications of using variable frequency drives are pumps and fans, suppose a 24/7 operate constant pressure water supply system's pump controlled by VFD may save as high as 30% electricity cost bills. Alok has 6 jobs listed on their profile.
(2) See Section 3. Figure 1-2 illustrates eight basic steps that are used to produce a supply of potable water. If " yes ," access and complete the necessary forms, including any required supplemental forms or other information , for your location/project and then submit. Elevation head - is the vertical distance which the water must be pumped. peak water demand requested on the application form was determined. m; preferably after nightfall. Demand of building in gallons per minute. conversion of one ERU equal to 185 gallons per day average water demand, or one ERU equal to 246 gallons per day maximum day water demand. 12 Use of the Analytical Method to Reproduce BRL Fire Test Data (Constant Fire Temperature). Determine the feeder/service neutral calculated load per 220. monitor the performance of the water delivery system in relation to the existing water supply and the constant changes in demand on the water system. Fire Water Pump Sizing - posted in Industrial Professionals: I have an offshore fire water pump which is rated for 1218m3/hr at 12 barg. Note: Use Table-1 for finding out water-cement ratio of Plain Concrete and use Table-2 for finding out water-cement ratio of Reinforced Concrete. Water Demand Calculations Excel Sheet XLS Calculator #101815643534 – Fire Water Demand Calculation Spreadsheet, with 32 Related files. Feasibility Study of 89 Shrewsbury Street Worcester, Massachusetts A Major Qualifying Project Submitted to the Faculty of Worcester Polytechnic Institute in partial fulfillment of the requirements for the Degree of Bachelor of Science in Civil Engineering By _____ Matthew Deptula _____. NEWSLETTER SIGN-UP.
(“Stan dard Per Capita Method” for projecting future water demands for Public/Private Water Systems serving less than 3300 people or withdrawing less than 330,000 gpd. (Identify and discuss types) • Incorporate sustainable energy sources. The curve defines the range of possible operating conditions for the pump. - Water daily demand calculation as per DEWA regulation, Water pipe sizing as per IPC code, Fire pump calculation as per NFPA. Many Department of Health employees provided valuable insights and suggestions to this publication. Down To Earth Mean Water is the most essential fluid to enjoy. uses of spreadsheet. Under a some conditions, the water in dead-end lines develops tastes and odors from stagnation. Quickly determine you water supply capabilities with our on-line application for graphing fire hydrant flow test information on a Logritmic Graph N 1. Due to the nature of intermittent use this will unfortunate add up to unrealistic demands for the main supply service lines. After some additions in the Offshore platform, the total demand increased to 1495 m3/hr and pressure at pump discharge is 11 barg. This causes a shock wave which starts at the valve or pump and passes along the pipe, changing the fluid velocity as it goes. This would permit customers to be advised of any planned significant permanent changes which may affect the operation of fire sprinkler systems. Fire Flow Results; Fire Flow Results Browser; Not Getting Fire Flow at a Junction Node ; EPS Fire Flow Analysis Tool ; Water Quality Analysis. Sponsored Links. • Recent trends. Prior to introduction of the NFA formula, the Iowa Fire Flow Formula developed by Floyd W.
Fire sprinkler systems hydraulic calculations. Public consultation is a major element of the consents process in most Member States. Statoil ASA, Detailed Design for Gina Krog Topside EPCH Januari 2013 – Januari 2013 • Firewater system P&IDs and UFDs. At the bottom of the calculator it will tell you the pressure loss total of all sections combined. The nameplate rating of all appliances that are fastened in place, permanently connected to. Solar Water Heater System Cost: Enter the equipment and installation costs of the solar water heater system. This method, using water supply fixture units, was developed by Dr. The best way to find out this information is to read your monthly water bill. 4 Demand calculation 44 2. HNI'OI'ICI, Flu Protection and PVF J3 '. Many tanks are over sized therefore calling for a larger boiler. Flashworks - Electrical Service Load Calculations including: Panel Sizing & Balancing, Conductor & Conduit Sizing, Short Circuit Calculation, and Voltage Drop Calculations for both Residential, Commercial and Industrial buildings. Using the "Required ACWWA Meter Size" value from the M22 Manual Spreadsheet, enter it. Download Fire Flow / Pump Pressure Calculator and enjoy it on your iPhone, iPad, and iPod touch. Air-cooled Heat Exchangers are often supported above pipe racks for economy of plot space. For livestock, there may be a switch from moving herds to zero-grazing, which requires less water but closer to the dwellings.
Seasonal water rate in effect. Peak hour demands with wells/booster pumping plants on. A detailed description of this data is presented later in this study. calculations The starting point for determining gas and steam temperature profiles and steam generation is the assumption of pinch and approach points, as discussed above. Calculations Mechanical and Plumbing Plans Location and size of any required backflow prevention device, sized to meet fire flow demand Per City policy, all residential structures exceeding 3,000 s. By Zane Satterfield, P. Initially the jockey pump is used to maintain the pressure and when the fire is confirmed by a sprinklers or by the fire alarm panel the electric pump starts to work and then in case Failure or disconnection of Electricity for Electric Fire Pump The diesel pump is entered into the process. Developing sustainable water-use policies and integrated water-management pl. The proposed water system shall be analyzed for the following three conditions: 1. Currently, more is known and under-stood about general water demand patterns and peak demands because of the increasing focus on demand management in the water industry. The Needed Fire Flow (NFF) for commercial occupancies protected by an automatic fire sprinkler system installed in accordance with the general criteria of NFPA 13, Standard for Installation of Sprinkler Systems, is the demand at the base of the automatic sprinkler riser and inside/outside hose stream demand. During the drier months, when demand on the water system is high, rates will increase by about 25%, to reflect the added cost of supplying water to the city. Demand Factor = Maximum demand of a system / Total connected load on the system; Demand factor is always less than one. From fire flow and constituent concentration analyses, to energy consumption and capital cost management, WaterGEMS. Calculate house loads for common areas per Art.
Establishing an accurate replacement cost for your home is vital. We will try in this paper to pick 1 layout(the tree layout)and interpret it thoroughly in details with a study case. Click the Calculate button at the bottom of the form to calculate your estimated energy cost for a month. Elevation head - is the vertical distance which the water must be pumped. • Provide as-builts after installation showing pipe size, installation, inverts, manholes, and tie -in to. The International Association of Plumbing and Mechanical Officials (IAPMO) have made available a Water Demand Calculator (WDC) that estimates peak water demand in residential buildings. 1 for calculation of water demand for mixed land uses, schools and universities. The tests are also useful in determining the general condition of the water distribution system by detecting closed valves or wall deposits. Canaman, Cam Sur, Philippines. 51) show how a typical spreadsheet would be set up. Water Calculation Worksheet for _____ Name / Address of Prohect Information Required to Calculate Water Service Size 1. Here's what the spreadsheet calculator looks like after we enter the data requested for each of the pipe sections using the example in the sketch above. If you wish, you may also provide your estimate of unmetered but authorized water consumption (such as main flushing, tank cleaning, and fire fighting) in line 10. Standards for sizing and selection of fire pumps are governed by NFPA 20: Standard for the Installation of Stationary Pumps for Fire Protection. The 6-inch service main shows a pressure loss of under 7 psi, and an 8-inch shows under 2 psi loss. Equations displayed for easy reference.
The International Association of Plumbing and Mechanical Officials (IAPMO) have made available a Water Demand Calculator (WDC) that estimates peak water demand in residential buildings. If you prefer to use an online calculator, you can try the Kohler Commercial Water Usage Calculator or the BEF's business water usage calculator. ii) Looping & branching design for peak flow & fire flow. 0 No buildings 11 0. The textile Industry is in no way different than other chemical industries, which causes pollution of one or the other type. fire water calculation. Heat Loss Calculation Spreadsheet. Battery Calculations for Fire Alarm and Signaling Systems By NEMA | Fire Protection Engineering Poor planning and missing, incomplete or incorrect secondary power calculations are among the most common causes for rejection of a submittal to an engineer or to the authority having jurisdiction (AHJ). How to Calculate the Required Capacity kVA Rating or Amperage Capacity for Single and Three Phase Transformers Issue: Calculation of kVA capacity for a Single or Three Phase Transformer, based on Winding Voltage and Amperage information. 15a ncac 02t. Due to the nature of intermittent use this will unfortunate add up to unrealistic demands for the main supply service lines. Sponsor of the Uniform Codes, IAPMO — The International Association of Plumbing and Mechanical Officials — works in concert with government and industry for safe, sanitary plumbing and. Can run on PCs and on tablets. The table shown above can be calculated with an Excel spreadsheet like the one shown below. Note: Use Table-1 for finding out water-cement ratio of Plain Concrete and use Table-2 for finding out water-cement ratio of Reinforced Concrete. September 15, 2006 Chemicals used to treat steam boiler systems are applied based upon the demand and mode of reaction of each chemical used. Proudly created with Wix. Water Supply - Calculating Demand - Calculating expected demand of water supply in service lines Cross-Contamination Control - It is fundamental to keep the potable water in the water supply systems uncontaminated Converting WSFU to GPM - Converting WSFU - Water Supply Fixture Units - to GPM Water Supply Pipe. Pump Curves Pumps can generate high volume flow rates when pumping against low pressure or low volume flow rates when pumping against high pressure. Utility managers can use this spreadsheet-based software, developed by Liemberger and partners and supported by the World Bank Institute (WBI).
Age Analysis ; Constituent Analysis ; Trace Analysis ; Modeling for IDSE Compliance ; Water Quality Batch Run. Electrical engineering education and community. Alex Reed was appointed director of the Division of Water Resource Management in April of 2018, to continue the mission of safeguarding Florida’s water resources through proactive partnering with local stakeholders, other regulatory agencies and communities, and providing a more consistent and effective regulatory process. The tubes are arranged so that hot combustion gases flow through the tubes. During the drier months, when demand on the water system is high, rates will increase by about 25%, to reflect the added cost of supplying water to the city. The first link is a new template for you to use and the second link is the spreadsheet I filled out for our cabin project. dyke 3 - tank nos. causes an aircraft being used to contain or control a wildland fire to drop a payload of water or fire retardant in a location other than the location originally designated for the aircraft to. Before carrying out this task, the time taken to complete each task must be calculated This template is an example of how to calculate capacity. “Sue just had a salad and a coke, let’s call it $20 and take it off the top of top of the total $240 with tax and tip, which leaves the rest of to split $220. Additionaly, 62-555. Times New Roman Arial Wingdings Symbol Soaring Adobe Photoshop Image WATER FOR FIRE PROTECTION (Chapter 26) WATER FOR FIRE PROTECTION (Additional information) Slide 3 Slide 4 WATER FOR FIRE PROTECTION (Additional information) WATER FOR FIRE PROTECTION DESIGN OF SPRINKLER SYSTEMS (Additional information) Sprinkler head sizes (Additional. The fire fighting process is done by pumps designed specifically for the system. draws where the water in the pipe is hot enough for the next use-which reduces the amount of water that runs down the drain before hot water arrives at the fixtures. Click the Calculate button at the bottom of the form to calculate your estimated energy cost for a month. Check to see if the pipe sizes Ps in the calculations match the pipe sizes on the drawing. Related Documents. In this case the pump and tank will supply all the hydrants on site as well as the sprinkler system demand. - Water daily demand calculation as per DEWA regulation, Water pipe sizing as per IPC code, Fire pump calculation as per NFPA. Demand calculations, considering all water demands: domestic, irrigation and/or fire demands 3.
User-defined discharge coefficients are permitted but be sure that C o = C c C v. If the pressure continues to decrease to 20 psi, both tanks will be out of water and the only supply will be from the pump. As a minimum, a surge pressure created by instantaneous stoppage of a water column moving at 0. Historically a lot of water companies originate from municipalities. This maximum flow rate is also known as the “peak demand. adequate supply of hot water as well as conformance to all applicable codes plus the regulations of the authority having jurisdiction (AHJ). A properly designed domestic hot water distribution system should do the following: • Provide adequate amounts of water at the prescribed temperature to all fixturesand equipment at all times of use. Replacement of stored water with fresh water should be necessary only if the stored water becomes contaminated in some way or if the container should begin to leak. Chapter 5 WATER SUPPLY 5. A properly sized fire pump is critical to ensuring your fire sprinkler system will work appropriately and keep your building protected. Model constant or variable speed pumps Compute pumping energy and cost Model various types of valves, including shutoff, check, pressure regulating, and flow control Allow storage tanks to have any shape (i. basically i have 25 different skill sets and to improve the efficiency i just wanna do some calculation which is not possible through Erlang C therefore i am looking for simulation and your support. To prevent this, dead ends may require frequent flushing where houses are widely separated. If you can not find what you are looking for, please contact us at:. Hydrant flow tests are conducted to determine water availability in planning for firefighting activities, fire sprinkler systems or domestic water demand.
Unformatted text preview: 3/9/2017 Fire Pump Sizing and Selection | Plumbing Engineer Plumbing Engineer C'ASPE The Authoritaliw Source for Plumblng. For the expenses section, the calculator needs to know if you are going to pay for your home loan on an interest-only or principal and interest basis. In this case the pump and tank will supply all the hydrants on site as well as the sprinkler system demand. This property has onsite fire protection flow requirement served through the domestic meter of ___ gallons per minute. This calculation method cannot be applied to low temperature boilers. How to Calculate Your Home's Replacement Cost Value. Reading Your Water Bill The first step in changing the way that you use water in the future is by first understanding how much water you use today. i Foreword Purpose of this Manual This RURAL WATER SUPPLY DESIGN MANUAL is the first of three related volumes prepared for the use of prospective and actual owners, operators, managements,. Assume the motor efficiency to be 90%. (Identify and discuss types) • Incorporate sustainable energy sources. ("Stan dard Per Capita Method" for projecting future water demands for Public/Private Water Systems serving less than 3300 people or withdrawing less than 330,000 gpd. The slippery part of this approach is justifying the daily rate you use. Even though this hot water heater is very efficient, the cost of electricity balances the unit’s total efficiency by making it non cost effective. ) 4 copies of the final form of the branch application drawing To initiate service, a meter must be purchased. Solar Water Heater System Cost: Enter the equipment and installation costs of the solar water heater system. Please contact Fire Underwriters Survey for this document. Fire Fighting Demand: The per capita fire demand is very less on an average basis but the rate at which the water is required is very large. Calculation of Water Design Demand; including Needed Fire Flow (See 4. Figure 1-2 illustrates eight basic steps that are used to produce a supply of potable water.
fire fighting plays the most important role in our ability to protect life and property from fire. date property of 1600 1600 loc. This is done by multiplying the item wattage by the number of hours used each day. Hydraulic Calculator for the Fire Protection Industry. 1 Steam/water diagrams used in boiler calculations Temperature-heat (T-Q) diagram The T-Q diagram is a useful tool for designing heat exchangers. tf = Fire scenario duration K = Reduction factor, which takes into account effects like evaporation of water in contact with fire and high temperature surfaces, as well as dispersion of. For the expenses section, the calculator needs to know if you are going to pay for your home loan on an interest-only or principal and interest basis. This webpage calculator is still online but a more complete raceway and trough fill application is included in the Code Calculator suite. If your project has had a more sophisticated water use analysis, you can skip the calculator and enter the modeled values below in section 3. Chapter 2 presents a. Otherwise, a fire could cause severe property damage and. Key Benefits. The basic pipe. What used to take days or weeks is able to be accomplished with AFT's pipe flow software in a short amount of time. Panel board or switchboard schedules, showing connected and demand wattage or amperage, number of active branch circuits to be installed, and number of spare branch circuits for future use. Please enter information into. Then six water samples were collected: 30mL of water form the Ohio River, 30mL of water from the Great Miami River (near a large coal plant), 30mL of water from Miami Whitewater River, 30mL from Burnet Woods Lake, 30mL of water form Winton Woods Lake, and 30mL of water from a bottle of spring water for a control.
Even though this hot water heater is very efficient, the cost of electricity balances the unit’s total efficiency by making it non cost effective. Heat load calculations There are several different methods of calculating the heat load for a given area: Quick calculation for offices For offices with average insulation and lighting, 2/3 occupants and 3/4 personal computers and a photocopier, the following calculations will suffice: Heat load (BTU) = Length (ft. Utility Service Application. (“Stan dard Per Capita Method” for projecting future water demands for Public/Private Water Systems serving less than 3300 people or withdrawing less than 330,000 gpd. Please contact Fire Underwriters Survey for this document. The current system Hanover is using is a simple Microsoft Excel spreadsheet that has no organization, direction, or systematic approach to it (Figure 1). Equation 9-1 shown below should be used for estimating minimum ES requirements, unless actual water use records indicate a more applicable volume. Guide to using pipe sizing spreadsheet by Peter Wenning To be read in conjunction with: Pipe sizing tabulation sheet (Microsoft Excel spreadsheet) Pipe sizing guide figures (pdf file) "Selection and sizing of copper tubes for water piping systems" by Barrie Smith (pdf file) AS/NZS 3500. 10*1500) as a minimum water demand for this building. 0 ESFR (12-head calculation) at a minimum operating pressure of 75 psi is still available for maximum storage height of 30 feet and 35 feet in buildings with maximum ceiling heights of 40 feet. This would permit customers to be advised of any planned significant permanent changes which may affect the operation of fire sprinkler systems. There is no need to change any of the following figures unless you wish. Friction loss occurs when water passes through a hose. The most popular method of determining peak demand is the Hunter Method. If the pressure continues to decrease to 20 psi, both tanks will be out of water and the only supply will be from the pump. HYDRAULIC CALCULATION Fill-In info from charts for calculation Calculated Fields SITE DATA DATA SOURCE Water Source: City Potable Main CSM Water Resources (310) 458-8535 ext 4 Maximum Static Press at source: 93. Alex Reed was appointed director of the Division of Water Resource Management in April of 2018, to continue the mission of safeguarding Florida’s water resources through proactive partnering with local stakeholders, other regulatory agencies and communities, and providing a more consistent and effective regulatory process.
DC Water Log Slip DC Water General Construction Notes Tap Request Need A Tap Installed? Meter Set Request DC Water Meter Set Request Design Standards and Forms | DCWater. This number of sprinklers, which must be supplied regardless of the location of the fire within the building, is the basis of the concept of the. makes no difference if the 1 ft (50 cm) of water is held in this narrow container or at the bottom of a 1 ft (50 cm) deep lake. Refer to Tables 2. Water demand was phased in at 525 acre-feet per year until capacity was reached. Power is consumed by a pump, fan or compressor in order to move and increase the pressure of a fluid. The figure below shows the plumbing for both the fire protection and domestic water usage. , a disinfection by-product) or decays (e. Spreadsheet Templates For Fire Dynamics Calculations Water Demand Calculator Excel Sheet - XSL Calculator 2. For livestock, there may be a switch from moving herds to zero-grazing, which requires less water but closer to the dwellings. the water discharges the required distance, an easy field measurement, to obtain the desired velocity. A BTU is an abbreviation for B ritish T hermal U nit, which is the amount of energy required to raise 1 pound of water 1 degree Fahrenheit at sea level. The rate of fire demand is sometimes treated as a function of population and is worked out from following empirical formulae: Authority Formulae (P in thousand) Q for 1 lakh Population) 1 American. Voltage drop is a loss of voltage that occurs when electricity travels over long runs of wire or cable. The Water Calculator contains information on water consumption for hundreds of products, enabling quick and easy specification, without the hassle of gathering data from several product manufacturers. Utilities will review for availability, backflow devices, demand fees, water meter size, etc. The number of calculated fixture units are used to determine the minimum necessary domestic water meter size.
The mission of the City of San Diego Public Utilities Department is to ensure the quality, reliability, and sustainability of water, wastewater and recycled water services for the benefit of the. 5 Demand forecasting 48. The fire fighting process is done by pumps designed specifically for the system. TOTALS Acre feet Total irrigation water amount Total potable water amount Total process water amount Total Water rights dedication required from PUD Water agreement (potable + process) FEES Water Sewer plan review fee. Utility Service Application ERC Calculation Spreadsheet (3 pages) Water Meter Placement Form Sewer Lateral Placement Form Assistance with the completion and submission of the forms in this packet is available in person at the City of Tampa Development Services Center, 1400 North Boulevard, or by phone: Wastewater (813) 274-8065 / Water (813) 274-5913. 4 Guidelines for the supply of water to fire sprinkler systems. Calculation of Water Design Demand; including Needed Fire Flow (See 4. If the meter records any water usage during this period, you have a leak or undocumented consumption. ' FIRE PUMP SIZING AND SELECTION When starting a fire pump design, the most important item to consider is the water supply. 48 gallons per cubic ft of water. The owner or the owner's agent shall be responsible for carrying out inspection, maintenance and testing procedures of the sprinkler system. Calculating Piping Losses and Their Effect on Pumping. While it may surprise some of you "air heads," there are regions of the country where homes and buildings are heated with water. 1 PURPOSE AND SCOPE 5. 5 General well construction 3. It all revolves around a very basic equation to determine velocity and rate of flow. To calculate the required wattage rating needed to supply the subpanel, multiply the total wattage (from the square footage and appliance calculations) times 1. Knowledge, news and software tools. Fire Water Demand Calculation Spreadsheet.