Pypley: Pump & Pipe Calculator

Pypley: Pump & Pipe Calculator

System Curve, NPSH & Head Loss

0 ratings
6 reviews
$2.99
In-App Purchases

Details

Released
November 15, 2020
Updated
November 14, 2026

Features

Pypley: Pump & Pipe Calculator screenshot #1 for iPhone
Pypley: Pump & Pipe Calculator screenshot #2 for iPhone
Pypley: Pump & Pipe Calculator screenshot #3 for iPhone
Pypley: Pump & Pipe Calculator screenshot #4 for iPhone
Pypley: Pump & Pipe Calculator screenshot #5 for iPhone
Pypley: Pump & Pipe Calculator screenshot #6 for iPhone
Pypley: Pump & Pipe Calculator screenshot #7 for iPhone
Pypley: Pump & Pipe Calculator screenshot #8 for iPhone
Pypley: Pump & Pipe Calculator screenshot #9 for iPhone
Pypley: Pump & Pipe Calculator screenshot #10 for iPhone
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About

This app calculates flow rate, pressure drop, and pump performance for circular pipe systems. It supports custom pumps and fittings, and allows for unit conversions between Metric and US Imperial. Ideal for hydraulic and process engineers for early-stage design and quick estimations.

✓Flow rate and pressure drop calculation
✓Customizable pump and fitting database
✓Metric/Imperial unit conversion
✓Pump performance curve plotting
✓Cavitation risk assessment (NPSH)
✓Reynolds number and friction factor calculation
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What's New in Pypley

5.1

November 14, 2026

The biggest Pypley update yet. • Now free to download, with one full project and every feature. A one-time purchase unlocks unlimited projects. No subscription. • Bought Pypley before? Unlimited projects stay free for you, and your saved projects carry over. If the upgrade screen ever appears, tap Restore. • Trace pump curves from a photo or PDF • Closed loops with expansion vessel sizing to EN 12828 • Chillers and heat exchangers, corrected to your fluid • 413 fluids with properties across temperature • NPSH margins to ANSI/HI 9.6.1 for your type of service • Notes that point out problems and suggest fixes • PDF and CSV reports • Pipe sizes from 16 standards and 69 pipe materials • Speed and impeller trim with the affinity laws • A new design with dark mode, in metric or US customary units

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Subscriptions & In-App Purchases

$19.99

Unlimited Project

Save unlimited projects. One-time purchase.

User reviews

I would purchase this in a heartbeat, if…

I was able to add pipe data and I could enter a negative value for elevation below pump centerline. Dead in the water after the first two minutes of trying to use this app.

Response from developer

Thank you for your feedback, and I’m sorry to hear about your experience. As an engineer, this app started as a personal project, and I realize my initial approach might have made it challenging for others to use. I’m currently working on an update to make navigation more intuitive and address the issues you mentioned. I’m also putting together a quick two-minute tutorial video that will explain both the current version and the upcoming changes. I genuinely appreciate your patience and hope you’ll find the app more user-friendly with these improvements. Your feedback is invaluable as I continue to refine and improve it.

Very useful

As a mechanical engineer I constantly need to verify hydraulic pipe sizing and pump capacity. So I was always looking for something that can easily cross check my work like a second eye and this application is amazing in this regard. I just wish if the pumps selection are actual pumps from the market so you can just pick your selection and quickly check things in and that’s why I went for 4 starts instead of 5 :) .
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Very detailed application

I have been looking for an application that can calculate flow rate of fluids with different densities and viscosities and this one does it.

Great App

Definitely worth spending some time in the tutorials. App very easy to use and accurate results. I would definitely recommend.

Finally a simple app to solve a big problem

Simple and easy to use

FAQ

What is Pypley used for?

Pypley is a design tool for hydraulic and process applications. It calculates flow rate, pressure drop, and pump performance for circular pipe systems with Newtonian liquids, aiding in early-stage design and quick estimations.

What kind of pipe systems does Pypley support?

Pypley supports serial pipe systems with Newtonian liquids. It does not support parallel or network flow analysis.

Can I add my own pumps and fittings to Pypley?

Yes, Pypley allows you to store custom pumps and fittings via iCloud. You can also support custom fitting lists with Kv/Cv coefficients or pressure/flow data.

Does Pypley support different units of measurement?

Yes, Pypley converts all project parameters between Metric and US Imperial units, making it versatile for different engineering standards.

How does Pypley help assess pump issues?

Pypley evaluates NPSHr and NPSHa to assess pump cavitation risk. It also detects negative pressure in pipelines and identifies when centrifugal pumps reach maximum flow capacity.

What is the price of Pypley?

Pypley is a paid application, priced at $2.99. It does not have in-app purchases or advertisements.

How often is Pypley updated?

The latest version of Pypley is 4.0, last updated on September 16, 2025. This indicates a relatively active development cycle for the application.

What devices is Pypley available on?

Pypley is supported on iPhone and iPod devices. It is rated for ages 4 and up.