A jockey pump is a small pump connected to a fire sprinkler system in order to maintain a certain pressure in the sprinkler system, and sized to ensure that if a. If these conductors also supply related equipment, such as another fire pump motor, pressure maintenance pumps, and associated fire pump accessory equipment, they must have a minimum ampacity of at least 125% of the sum of the fire pump motors and pressure maintenance motors fullload currents and 100% of the associated fire pump accessory. All jockey pump valves to be located as required per nfpa 20. To calculate pump gpm, two sizing methods are available, the standpipe method and the sprinkler area calculation. In all cases, the pumping stations should be protected from physical damage. The horsepower required is dictated by the flow and pressure required. Also, remember that the election of the jockey depends of the longitude, size, type and leaks of the underground piping.
With 100 years of experience, aurora provides consistent, quality manufacturing and performance. Introduction to pumping stations for water supply systems course no. Sizing a jockey pump for these is more of a swag scientific. Standard for the installation of standpipes and hose systems says that the first standpipe requires 500 gpm and each additional standpipe requires 250 gpm, up to a. Pressure of jockey pump shall be greater than the pressure of main fire pump by minimum of 10 psi to avoid. In the event of a fire, the system pressure will drop further to start the main pump. Find a grundfos pump to replace old grundfos and competitor products.
The way to size a jockey pump for any fire pump system is the same no matter who the manufacturer is aurora or peerless or patterson, etc. The jockey being a tap off of the fp service is common, i cannot recall a jockey being fed from another source. Please contact me if a date becomes available sooner than i have selected. A jockey pump, or a pressuremaintenance pump, is a small apparatus that works together with a fire pump as part of a fireprotection sprinkler system. Also, what method should i used in order to size the flow capacity of the jockey pump. The jockey pump should only maintain system pressure and be able to handle small leaks. When starting a fire pump design, the most important item to consider is the water supply. Sizing of a jockey pump for an aurora fire pump system. When sizing a jockey pump set it is important to ensure that the performance of the. You cannot use the fire pump controller as a junction box for wiring to supply other electrical equipment. The pump manufacturer, armstrong pumps, recommends, as a rule of thumb, to size the jockey for about 1 % of the rated flow of the main fire. If youre referring to sizing the flow rate of a jockey pump as it relates to a normal leakage rate, generally we size the jockey pump flow rate to be 1% of the fire pumps rated gpm 1 gpm per 100 gpm of fire pump. With revenues of 25 billion in fy2016, our 144,000 employees serve customers in over 100 countries, helping. In a fully sprinklered structure with standpipes, nfpa 14 2010.
Submersible pumps frequently require smaller drop pipe than do line shaft pumps since the full area of the pipe is used to deliver water to the surface. It does not matter who the makes it, the method of sizing the pump is the same. The pump is a centrifugal pump that will need to pump 800 galmin when in normal operation. It is designed to keep the pressure in the system elevated to a specific level when the system is not in use, so that the fire pump doesnt have to run all the time and the system doesnt go off. These controllers are intended for use with fire pump systems. Installation and operation instructions peerless pump.
In other regions, singlephase motors are more widely used. The jockey pump, an important part of a fire pump system. Patterson jockey pump controllers are built to nema industrial standards and are ul508 listed and etl certified. It doesnt cover the jockey pumps or the internal wiring of the system photo. You are told to purchase a pump for your manufacturing facility that will carry water to the top of a tower at your facility. Line and load side power to the fire and jockey pump controllers and drivers must be completed per nfpa20 and. If the underground piping leaks excessively, jockey pump sizing must be increased to the maximum permitted. Remember that a jockey pump is a pressure maintenance pump.
Overall pump and fan efficiency is the ratio power actually gained by the fluid to the shaft power supplied. Get product recommendation based on your liquid requirements. Its built to withstand a variety of, mechanically aggressive and high temperature liquids, and is designed to extend uptime and help reduce lifecycle costs in a wide range of demanding applications. Positive displacement pumps are those in which energy is imparted to the liquid in a fixed displacement volume, such as a casing or a cylinder, by the rotary motion of gears. Aug 28, 2017 schneider electric is the global specialist in energy management and automation. Guidance is provided for sizing and selection of pumps and pump. Pumps and drivers on separately coupledtype pumps shall be aligned in accordance with the coupling and pump manufacturers speci. Pdf fire pump layout and sizing subash kumar academia. Achieving this mass flowrate requires a pump that can generate a. It does not matter who the makes it, the method of sizing the pump. Jan 02, 2014 the national fire protection agency nfpa guidelines do not put much attention on jockey pump sizing. Before we answer the quetion, itd better to understand what jockey pump is and what the function in fire fighting sytem. Jockey pumps are typically small multistage centrifugal pumps, and do not have to be listed or certified for fire system application.
If you are utilizing the city water supply as the primary source for the pump, you need to make sure that an accurate city water test is used. Schneider electric is the global specialist in energy management and automation. A qualified electrician must be onsite in the pump room during the startup and test to make an changes to the wiring. Fire hydrated 1500 spt which pamp size jacky modal purchase. If you work with the connections or controls for fire pumps, you need to understand article 695. But even medium to small pump stations need access by maintenance crews and equipment, and ease of access should always be considered. Centrifugal pump design is the most typical for fire pumps and auxiliary pumps in modern fire apparatus and its proven design has been used in fire apparatus for well over a century. Feb 05, 2016 im in the middle of designing a service to a new fire pump building. Fire pumps are normally purchased as a complete package that includes the following. As a manufacturer and supplier of centrifugal pumps and positive displacement pumps we offer the optimum for both applications. If a transformer supplies an electric fire pump motor, size it at least 125% of the sum of the fire pump and pressure maintenance pump s motor loads, and 100% of the ampere rating of the fire pump s accessory equipment 695. Calculating the size of jockey pump for an underground distribution. The jockey pump is not as mundane as many engineers, contractors, and installers would have you believe. Jun 05, 2017 if youre referring to sizing the flow rate of a jockey pump as it relates to a normal leakage rate, generally we size the jockey pump flow rate to be 1% of the fire pump s rated gpm 1 gpm per 100 gpm of fire pump.
The mass flowrate of the system is established on the process flow diagram by the mass balance. Guidance is provided for sizing and selection of pumps and pump drives, piping, control valving, flow metering, pump station. The esv fabricated vertical multistage pump is an energy saving, nonpriming pump coupled to a standard premiumefficient motor. Jockey pumps are a low cost yet essential component of a fire pump sprinkler system. The following is a pump sizing problem to illustrate the calculations in this article. In a basic centrifugal pump, typically a single casing, water enters through the pump inlet into the center eye of the impeller which is spinning on a shaft. Fire pump sizing the estimated performance of the fire pump between 100% and 150% of rated flow can be calculated using the following formula. Find a suitable pump based on head, flow and design. Does this sizing seem ok or does anyone have any issues with this set up. Anything over 20 gpm is getting excessive and approaches the flow capacity of some heads. Today, you can expect to find a fire pump in almost any public building or factory. How to calculate jockey pump capacity in fire fighting system.
Each pump is tested hydrostatically for not less than 5 minutes. Then the jockey pump flow rate is 1500 gpm 1% 15 gpm. The jockey pump is not intended to handle fire sprinkler discharge. Typically the jockey pump is sized to 1% of the fire pumps rated flow. But vendor who supply fire fighting package stated that they will supply jockey pump with the capacity of 25 gpm. There is a limitation to the performance of a pump powered by a singlephase motor. Armstrong horizontal endsuction hes fire pumps deploy a heavyduty bearing frame to provide long and reliable service in an overhung impeller design. Design of sewage pumping stations zoeller engineered products. Design of sewage pumping stations by john zoeller, pe, ceopresident. Except for no test header requirement, a jockey pump has the same basic components as the main fire pump. A jockey pump should be sized to make up the allowable leakage rate within 10 minutes or 3. Aurora is a reknowned supplier of pumps and pump systems used in a variety of commercial, fire suppression, hvac, industrial, marine, oil and gas and municipalwater treatment markets and applications throughout the world. Since fire pumps are considered life safety equipment, they must be reliable.
Mar 22, 2020 a jockey pump, or a pressuremaintenance pump, is a small apparatus that works together with a fire pump as part of a fireprotection sprinkler system. You must not connect conductors supplying power for pressure maintenance jockey or make up pump s to the fire pump controller, per sec. Fire fighting how to calculate fire pump and jockey pump capacity in fire. If the pump is powered by a diesel driver the below items must be completed before sth arrives. The pump shall be hydrostatically tested and run tested prior to shipment. Drop pipe selection size of drop pipe is selected based on the capacity to be pumped. Pump sizing and selection made easy chemical engineering. I would defer to traviss wisdom and ensure that the pump has a flow rate of 1% of the pump rating and has the appropriate pressure rating for your system.
Jockey pumps are variable speed pumps used in conjunction with the main. This suggest the jockey pump be sized less than the smallest single sprinkler head but also cautions to make sure it. The standard method of sizing the foampak capacity is by multiplying the area of the hazard by the required density, multiply. Mar 28, 2002 in some parts of the country, all jockey pumps are powered by threephase motors. Fire fighting how to calculate fire pump and jockey pump.
Most stationary fire pump assemblies are installed with devices that automatically sense a pressure loss in a fire protection system, and start running to supply water or boost pressure in that system. It is designed to keep the pressure in the system elevated to a specific level when the system is not in use, so that the fire pump doesnt have to run all the time and the system doesnt go off randomly. The jockey pump is not as mundane as many engineers, contractors, and installers would. The jockey pump jp or pressure maintenance pumps pmp as. Note 7 will indicate wire size for 125% of the flc of the jockey pump. The other is a low flow, high head jockey pump which keeps the system pressurized during normal non. From time to time, though, small water leaks, unwanted pressure drops, or even. The fire protection solutions for mainland applications include entire pump systems, complete with jockey pumps and main pumps that are either diesel or electrical driven, while a dedicated range of grundfos offshore pumps is available for vessels and oil rigs. Jockey pumps are small, motor driven pumps used in conjunction with main fire pumps to. If you have a leakage rate greater than 15 gpm, then you have bigger issues than the size of the jockey pump. The pump size must conform to the flow rate, pressure, speed, suction conditons etc. Municipal these systems are designed to serve a given natural drainage area and are part of the public sanitary sewer system. Since the jockey pump is not required to be listed, the control valves and check valve are not required to be listed. Aug 11, 2012 how to calculate jockey pump capacity in fire fighting system.
In our design basis, we stated that the capacity of jockey pump is 50 gpm the capacity of main fire pump is 500 gpm for electric motor fire fighting and diesel engine fire fighting, respectively. Turbo machines affinity laws can be used to calculate volume capacity, head or power consumption in centrifugal pumps with changing speed or wheel diameters. The national fire protection agency nfpa guidelines do not put much attention on jockey pump sizing. Hence a jockey pump is an important part of the fire pumps control system. There shall be provided a pressureactuated switch having independent high and low calibrated adjustments in the controller circuit. This may help provide a constant pressure control with a slight to moderate over sizing a jockey pump for future leaks or large system expansions. Mar 17, 2015 how to and not to size a jockey pump published on march 17, 2015 march 17, 2015 37 likes comments. This enables the pump to start dry and reprime itself without manually adding water.
One is the main fire pump which delivers large volumes of water to the fire standpipe system in case of fire. Your system remains hydrostatic until a a sprinkler operates or b you have a leak upstream of the pump discharge. Installation and operation instructions peerless pump company 2005 dr. Introduction to pumping stations for water supply systems. Fire fighting how to calculate fire pump electrical driven pump diesel driven pump and jockey pump capacity in fire fighting system. In addition, these pumps can be used when lots of air has to be moved such as with well point dewatering systems. Generally spoken, the pump is a device that conveys a certain volume of a specific liquid from point a to point b within a unit of. A jockey pump is sized for a flow less than the flow to one sprinkler in order to ensure a system pressure drop. Pump sizing pump sizing involves matching the flow and pressure rating of a pump with the flowrate and pressure required for the process. A rule of thumb for sizing jockey pump supplying underground piping is to use 1% of the fire pump rated capacity.
A jockey pump is an important component of fire fighting system. Centrifugal pumps closecoupled 6 features booster service jockey pumps liquid transfer spray systems general service water circulation capacities to 640 gpm heads to 175 feet. The control valves to and from the jockey pump shall be supervised butterfly. Fire pump overview fire pump unit defined a fire pump is a device that provides the required water flow and pressure for a fire protection system. It will switch the pump on and off periodically to maintain trunk main pressure at high level. Select impeller in exactly the same manner as for lineshaft type pump.
The other is a low flow, high head jockey pump which keeps the system pressurized during normal nonfire conditions. When designing or installing electrical power supplies for fire pumps and their accessories, you must apply special rules as listed in nfpa 70, the national electrical code nec, and the standard for centrifugal fire pumps cfp nfpa 20. The pump shall be hydrostatically tested at a pressure of not less than one and onehalf times the. Design of sewage pumping stations by john zoeller, pe, ceopresident this article provides guidelines for designing municipal pumping systems. Other than the method of taking the 1% pressure capacity of fire pump to calculate the jockey pump pressure capacity, is there any calculation method on how to size its pressure capacity. The armstrong 4700 multistage pumps are designed for reliability and low maintenance cost. The test pressure is to be upto 2 times the maximum working pressure of the pump, but in no case less than 250 psi 1724 kpa to ensure no rupture or leakage through the castings at the test pressure. The jockey pump shall be installed in accordance with nfpa 20. Following is the most relevant text related to this, from nfpa 20.
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