In this article we learn how to perform pump calculations in both imperial and metric units to assess pumping performance following the change of flow rate, pump speed, head pressure and power. These formulas are common practice rules of thumb and provide theoretical values to which actual values will likely differ. YouTube video tutorial at the bottom of the page.

To calculate the new flow rate of a pump from an increase or decrease in pump speed RPM, the following formula and calculation can be used. To calculate the new flow rate of a pump from an increase or decrease in impeller diameter, the following formula and calculation can be used. To calculate the new pump speed RPM from an increase or decrease in flow rate, the following formula and calculation can be used.

To calculate the new pump head pressure from an increase or decrease in pump speed RPM, the following formula and calculation can be used.

### All Plumbing Design Calculation In One Excel Sheet

To calculate the new pump head pressure from an increase or decrease in flow rate, the following formula and calculation can be used.

To calculate the new pump head pressure from an increase or decrease in pump speed rpm, the following formula and calculation can be used. To calculate the new pump impeller diameter to suit a change in pump flow rate, the following formula and calculation and be used. Can you please tell me the direct relationship between pump capacity, head, impeller speed and impeller dia. Save my name, email, and website in this browser for the next time I comment.

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Sign in. Log into your account. Password recovery. The Engineering Mindset. Home Building services Pump calculations. Pump calculations how to calculate pump speed, head pressure, rpm, volume flow rate, impeller diameter. Calculate pump flow rate from an increase or decrease in pump speed RPM To calculate the new flow rate of a pump from an increase or decrease in impeller diameter, the following formula and calculation can be used.

Calculate pump flow rate from a change in impeller diameter To calculate the new pump speed RPM from an increase or decrease in flow rate, the following formula and calculation can be used.

Calculate pump speed RPM with an increase or decrease in flow rate To calculate the new pump head pressure from an increase or decrease in pump speed RPM, the following formula and calculation can be used.

Calculate head pressure for an increase or decrease in pump speed rpm To calculate the new pump head pressure from an increase or decrease in flow rate, the following formula and calculation can be used. Calculate pump head pressure for an increase or decrease in flow rate To calculate the new pump head pressure from an increase or decrease in pump speed rpm, the following formula and calculation can be used.

Calculate head pressure for an increase or decrease in pump speed rpm To calculate the new pump impeller diameter to suit a change in pump flow rate, the following formula and calculation and be used. Calculate new pump impeller diameter to suit a change in flow rate.

Centrifugal Pump Basics.This spreadsheet allows the user to find the pump power requirement Watts or Brake Horse Power for various feeder pipe diameters in and given a known flow rate LPSpipe length m and head m and then select a suitable pump based upon available pump characteristic data. This site is aimed at providing technical resources and information to assist Appropriate Technology AT specialists working in the following areas: drinking water supply, sanitation, electrical supply, construction, fuel-efficient cooking stoves and environmental education.

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Any projects making use of information from this website are undertaken at your own risk. The application of Appropriate Technology. Welcome This site is aimed at providing technical resources and information to assist Appropriate Technology AT specialists working in the following areas: drinking water supply, sanitation, electrical supply, construction, fuel-efficient cooking stoves and environmental education.

Our Mission ITACA understands AT as technologies that are easy to construct and maintain, low cost, using local resources as far as possible, simple to replicate and adapt to different contexts, and both environmentally and economically sustainable in the long-term.

Search This Site. Admin Eng Admin Esp.Few people ever think about how the water gets to the top floors of high-rise buildings for everyday living purposes. High-rise buildings decorate the landscape of our major cities across our great nation. Few people ever think about how the water gets to the top floors of these buildings for everyday living purposes, such as drinking and bathing, and mechanical uses, such as cooling towers and supplying HVAC equipment.

For as long as high-rise buildings have existed, delivering water to every floor has been a necessity. The most common system used in the late s and early s consisted of a roof tank combined with constant-speed pumps that operated by a level switch in the tank.

When the level in the tank would approach a pre-determined height, the pumps would either turn on to pump more water to the tank or turn off because the tank was full. In colder climates, the roof tank system required heating the water to prevent freezing. During the summer months, the water was warm. On many of the older buildings in major cities, you can still see some of these tanks on the rooftops, although they may not be in service.

New York City still uses this type of design, but addressed the old pigeon problem. In the s, pneumatic pressure tank systems replaced many roof tank systems. These systems put the pneumatic tank inside the building. The pumping equipment pumped water to the pneumatic tank pressurized by an air compressor that supplied water to the floors.

The systems, for the most part, worked well if properly maintained, but required large areas for equipment installation and were expensive to install.

In addition, these systems were big consumers of energy because they ran at a constant speed, despite low demand periods where water was hardly used. Water pressure systems or booster systems have come a long way since the early days. Now, building owners have many control and pumping options that solve any pumping application, while saving on energy costs and space. Booster systems now come prefabricated and skid-mounted, which allows for ease of installation and provides many design solutions to meet constrictive space requirements.

Building owners can now choose from state-of-the-art variable- speed control, which can cut energy bills in half over the life of the system while increasing system life by years. Because a constant water pressure is desired in the building, various control schemes can be employed to maintain the desired pressure with varying flows.

Variable-speed water pressure systems use a transducer to sense pressure and automatically adjust the speed of the pump in order to maintain a constant discharge pressure regardless of demand or flow. The result is that the pump energy used is reduced as the flow demand decreases. On the other hand, constant-speed systems maintain the same pump speed, regardless of flow, and depend on pressure-reducing valves PRV to adjust building pressure.

Applications of more than gpm should consider three-pump installations for greater dependability. For systems with extremely variable demands-i.We use cookies to provide you with a better experience. By continuing to browse the site you are agreeing to our use of cookies in accordance with our Cookie Policy. Demand for water in multi-story buildings such as hotels, multifamily, office and other institutional applications — require pressure-boosting equipment to raise incoming municipal water pressure to serve upper floors.

Booster systems or packages contain one or more pumps and related accessories and controls. Until the early s, pressure regulator valves were typically used to control booster system pressure.

**How booster pump & pressure tank works & why you need CSV a cycle stop valve**

The more energy-efficient option is to design a booster system that ramps up to meet the specific demand. These systems are designed to deliver the minimal pump output necessary to achieve optimal performance — all without direct human intervention. For commercial building applications, the flow will be determined by the total number of fixtures or fixture units Fu being served sinks, WCs, urinals, hose bibbs, showers, drinking fountains, cooling towers, irrigation, etc.

The fixture unit computation is based on the average use of each fixture and its corresponding gpm. Within these references, tables provide the fixture unit values for both private installations residential or multi-family settings and institutional installations public spaces with multiple users such as a restaurant for each type of fixture.

Once the fixture unit values are determined, multiply each fixture type by its corresponding rate to calculate the total fixture unit. A fixture vs. The first step in calculating a flow rate is to find the sum of each type of fixture and multiple by the number of fixture units assigned to that type of fixture, referencing either the ASPE Design Handbook or Engineered Plumbing Design II:.

Using the 1, total fixture units in the above example, we find a flow rate of approximately gpm. For a conservative approach to calculating total fixture units and resulting flow gpmcross reference multiple sources for fixture unit values and use the highest count of fixture units when calculating flow gpm. Variations in fixture units can occur between sources or how different terms are interpreted. Once the required flow rate is calculated, we need to determine the head pressure required by a specific application.

Four main elements are needed to determine head:. Calculating static head HS: We multiply the number of floors by the height of each floor:. To do so we first need to determine the friction loss, or the resistance to flow caused by friction as the water moves along the walls of the pipe, as well as the resistance caused by its own turbulence.

Added together, these losses are referred to as friction loss and may significantly reduce system pressure. Distance, pipe diameter and gpm all affect friction loss and standard friction figures vary between 4 feet to 10 feet per feet of pipe. For this example, pipe friction loss per feet of pipe is 6 feet, which means we need to overcome 6 feet of head loss for every feet of vertical pipe that we have in the system.Roof Top Domestic Booster Pump.

Booster System Calculation. C Cistern. Wash Basin. Long Bath. UR FV. WC FV. Shower Points. Bib Taps. Therefore based on CP48, the total loadings units of. Water Closet. Total nos. Therefore according to CP48, the flowrate for. Frictional losses. Therefore friction losses through.

Page 1. Velocity of. Total Dynamic Discharge Head.

## How to Properly Size a Domestic Water Pressure Booster System

Static Head. Discharge Pressure. Based on flowrate o. Page 2.

### Pressure Booster System Basics

Page 3. Learn more about Scribd Membership Home.Printer Friendly PDF. Deppmann announcements section. Always start with an analysis of the required pressure in the building. The chances of surprises later on are drastically reduced.

All of these should be identified as inlet and outlet conditions. The pump head will include the required pressure boost as well as any package pressure drop losses. Of course, you may schedule that head to keep package losses to a minimum for energy conservation, but the manufacturer should be responsible to provide a required discharge pressure when supplied with a minimum suction pressure.

This is the pressure required by the water closet, flush valve, or other fixture. It is provided by the specified valve or fixture manufacturer. This is the pressure you will use for the booster system calculation under load. I like to have a little extra and not design at the minimum required. Normally this is at the same elevation, but once in a while you may have an application where the pressure booster is located on a different floor.

This would be the horizontal pipe on the discharge of the booster system plus the longest run on the floors to the controlling fixture. This would be the horizontal pipe on the inlet of the booster system from the incoming water line, including fittings. This is the maximum pressure drop you design to in your office. Examples are water meters, double wall plate heat exchangers, water heaters, thermostatic master mixers, and backflow preventers.

What is the pressure drop at design flow and minimum flow? Example: a backflow preventer on a ground-level cooling tower would not be a factor if a fixture at the top of the 3-story building needed 35 PSIG.

A water heater and master mixer on the hot water side with a combined pressure drop of 15 PSIG will not make a difference if the cold water flush valve requires 35 PSIG and the hot water faucet does not. You still need to be the engineer and use judgment. Pressure Analysis Always start with an analysis of the required pressure in the building.

Example: 35 PSIG to a flush valve Maximum fixture pressure required This is normally limited by code or your internal office standards. Example: 85 PSIG to any fixture Your design fixture pressure required This is the pressure you will use for the booster system calculation under load.

Example: 75 feet Elevation from the incoming water supply to the booster suction Normally this is at the same elevation, but once in a while you may have an application where the pressure booster is located on a different floor. Example: 0 feet Total horizontal distance of longest run on the discharge side: This would be the horizontal pipe on the discharge of the booster system plus the longest run on the floors to the controlling fixture.

Example: feet plus a tee at 15 ft. Example: 20 feet horizontal plus 3 elbows at 7 ft. TEH each equals 41 feet Maximum friction loss per feet This is the maximum pressure drop you design to in your office. Pumps and Accessories. Boilers and Water Heaters. Hydronic Systems. Plumbing Systems. Steam and Condensate. Glycol Installation. Snowmelt Designs.

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Updated: March 29, Reader-Approved References. A pump is a basic but important mechanical device that supplies the force to move fluid at a specific flow rate.

Like any device that does work transfers energy across a distanceits effectiveness is measured in power. Although watts and kilowatts are more common units of power measurement, horsepower is still commonly used for high-output electrical devices in the United States.

In this context, 1 horsepower is equal to watts. Measure the vertical distance between the water level in the base reservoir tank and the water input at the destination tank and write down the measurement in feet.

Turn on the pump and a stopwatch at the same time. Once the pump is working, measure how many gallons per minute are being pumped and estimate the horsepower based on these values. To learn how to calculate the water horsepower for a specific project, read on!

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