# Pypley: Pump & Pipe Calculator — System Curve, NPSH & Head Loss > Pipe flow rate, pressure drop, and pump performance calculator for engineers. (iPhone/iPad app by Ali Mohammed.) - Source: https://appshunter.io/ios/app/pypley-pump-and-pipe-calculator/id1540444278 (this page in markdown: same URL + `.md`) - Developer: [Ali Mohammed](https://appshunter.io/developer/1540444280) - Category: Utilities, Productivity - Price: $2.99 with in-app purchases - Age rating: 4+ - Requires: iOS 17.0 · 8 MB - Languages: American English - Released: 2020-11-15 - Data updated: 2026-11-15 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/pypley-pump-and-pipe-calculator/id1540444278/reviews.md ## What is Pypley? Size and check pumped pipe systems on your iPhone. Describe the fluid, pipes, pump and suction side, tap Calculate, and Pypley finds where the pump will run, shows where every psi goes and checks for cavitation. Free to download, with one full project and every feature included. A one-time purchase unlocks unlimited projects. No subscription, no ads. WHERE WILL THE PUMP RUN? • Operating point on the pump and system curves, with efficiency and shaft power • Speed changes and impeller trims with the affinity laws • Viscous fluid correction to ANSI/HI 9.6.7 • A duty finder that ranks library pumps by efficiency at your flow and head WILL IT CAVITATE? • NPSH available against NPSH required, with ANSI/HI 9.6.1 margins for your service: general, building services, water, chemical, hydrocarbon, cooling water or boiler feed • Atmospheric pressure corrected for your site's altitude • Every suction loss itemized, so you can see what is using up your margin WHERE DOES THE PRESSURE GO? • Every pipe, fitting and valve itemized, with its share of the pump head • Friction from Colebrook–White, with roughness for 69 pipe materials • Notes that flag negative pressure, velocities outside guidance, pumps running outside their preferred range and check valves that aren't fully open, each with a suggested fix PUMP CURVES FROM A PHOTO OR PDF • Calibrate the axes, then tap along the head, efficiency and NPSHr curves • Polynomial fit, with CSV export • Or choose a generic 50 Hz or 60 Hz pump from the library, import a CSV or enter the curve by hand CLOSED LOOPS, CHILLERS AND HEAT EXCHANGERS • Open tanks, pressurized tanks and closed loops • Expansion vessel sizing to EN 12828, with pre-charge and safety valve checks • Local pressure at every point around the loop • 14 types of rated equipment, including chillers with the AHRI 550/590 test tolerance, entered from the datasheet and corrected to your fluid • Plate, shell-and-tube, coil and double-pipe heat exchangers estimated from their geometry LIBRARIES • 413 fluids, from water and glycols to oils, fuels and acids, with density, viscosity and vapor pressure across temperature • Pipe sizes from 16 standards, including ASME B36.10M, ASTM, AWWA, EN and ISO • 20 check valve types, orifices, strainers, filters and packed beds • A Kv and Cv library of fittings and valves up to NPS 48, including HVAC balancing and triple-duty valves • Save your own pumps and fittings to reuse in any project REPORTS • Share a PDF report with the system diagram, curves, losses and notes • Export the results to CSV BUILT FOR ENGINEERS • US customary or metric units, switchable at any time • Everything is calculated on your iPhone, so it works offline • Projects sync across your devices with iCloud • Model Check shows what's missing before you calculate • A step-by-step guide, searchable help and a glossary ## Key features - 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 ## Pricing and in-app purchases Base price: $2.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Unlimited Project | $19.99 | one-time | ## Is Pypley safe? Not enough ratings yet to assess Pypley. ## Is Pypley legit? Pypley: Pump & Pipe Calculator appears to be a legitimate app. The AppsHunter Legitimacy Score for Pypley is 83 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/pypley-pump-and-pipe-calculator/id1540444278/reviews.md ### 1/5 — I would purchase this in a heartbeat, if… *2024-08-29* 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. **Developer response:** 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. ### 4/5 — Very useful *2022-08-09, version 3.21* 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 :) . ### 4/5 — Very detailed application *2021-08-12, version 3.1* I have been looking for an application that can calculate flow rate of fluids with different densities and viscosities and this one does it. ### 5/5 — Great App *2020-11-19, version 1.0* Definitely worth spending some time in the tutorials. App very easy to use and accurate results. I would definitely recommend. ### 5/5 — Finally a simple app to solve a big problem *2020-11-18* Simple and easy to use ### 5/5 — Great App *2020-11-18, version 1.0* Recently downloaded this app to help with general pipework calculations. Can’t fault it 5⭐️ ## Frequently asked questions about Pypley ### 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. ## Version history (last 5 releases) ### 5.1 — 2026-11-14 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 ### 5.0 — 2026-11-12 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 US customary or metric units ### 4.0 — 2025-09-16 * Converts all project entries between US and Metric units. * Added in-app guidance for easier navigation and use. * Resolved bugs to prevent unexpected app crashes. * Projects now saved in chronological order, with newest first. * Updated material library with additional entries and improved data. ### 3.21 — 2022-04-23 *Improving the UI to be more user friendly. *fixing a problem with negative pressure detection. *fixing a bug in custom fittings number. *fixing a bug that can cause the app to crash. ### 3.2 — 2022-04-19 *Improving the UI to be more user friendly. *fixing a problem with negative pressure detection. *fixing a bug in custom fittings number. ## Apps similar to Pypley | App | Rating | Price | Category | | --- | --- | --- | --- | | [Emko-Isometric_Pipefitter](https://appshunter.io/ios/app/emko-isometric-pipefitter/id6471570117) | — | Free | Utilities | | [MEP Calc: HVAC Fire Calculator](https://appshunter.io/ios/app/mep-calc-hvac-fire-calculator/id6759204237) | — | Free | Utilities | | [AVK Assist](https://appshunter.io/ios/app/avk-assist/id1539642349) | — | Free | Utilities | | [EFHW Remote Switch](https://appshunter.io/ios/app/efhw-remote-switch/id6742027566) | — | Free | Utilities | | [SmartP](https://appshunter.io/ios/app/smartp/id6478264819) | — | Free | Utilities | | [GreenLine by XTIAN](https://appshunter.io/ios/app/greenline-by-xtian/id6754384434) | — | Free | Utilities | ## Related topics [pypley](https://appshunter.io/ios/topics/pypley) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-15.*