Formula to calculate psi required to deliver gpm through nozzel

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Discussion Overview

The discussion revolves around calculating the required PSI to deliver a specific flow rate (2.5 GPM) through a nozzle with a 2mm opening. It touches on fluid mechanics principles and practical applications related to testing water resistance in restaurant equipment.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant requests a formula to calculate the required PSI for delivering 2.5 GPM through a 2mm nozzle.
  • Another participant notes that the answer depends on the configuration and suggests considering mass flow, which is related to fluid velocity, cross-sectional area, and fluid density.
  • A participant shares their limited experience with fluid mechanics and describes an experiment using a garden hose that delivered significantly less water than required, expressing uncertainty about measuring supply pressure.
  • One suggestion involves using a pressure tank with compressed air to increase pressure, but the participant is unsure how to calculate the necessary PSI for this setup.
  • A participant recommends looking up orifice flow and provides a link to a calculator and explanation for further exploration.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific formula or method to calculate the required PSI, and multiple approaches and uncertainties remain in the discussion.

Contextual Notes

Participants express limitations in their understanding of fluid mechanics, and there are unresolved aspects regarding the configuration of the setup and the method for measuring pressure.

Who May Find This Useful

This discussion may be useful for individuals interested in fluid mechanics, practical applications of pressure calculations, or those involved in testing equipment for water resistance.

SALTYFRIES
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I need to build a device to test the water resistance of a piece of restaurant equipment. The device must deliver 2.5 GPM of water through a nozzel with an opening of 2mm. Can someone please give me a formula to calculate the required PSI to deliver the needed volume of water?

Thank you.
 
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The answer to that question largely depends on the configuration of your set up. How much experience do you have with fluid mechanics? For starters, the mass flow (your GPS) is equal to the velocity of the fluid times the cross sectional area of the pipe times the fluid density.
 
I am mostly mechanical and have almost no experience with fluid mechanics. I experimented with 3/4 diameter garden hose, connected to the city water supply, on the end of which was a cap with a drilled 2mm hole. I currently have no practical method to check the pressure of the supply but it delivered 91oz of water per minute, much less than the 320 required. I then had the idea to fill a pressure tank with water and connect compressed air to the tank to increase the pressure, but I do not know how to calculate how many psi would be required and so can't determine if that might be a feasible solution.
 

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