# PipeDN — Nominal Pipe Size Calculator

> Nominal Pipe Size Calculator (iPhone/iPad app by AQUILES DE LIMA.)

- Source: https://appshunter.io/ios/app/pipedn/id6760237428 (this page in markdown: same URL + `.md`)
- Developer: [AQUILES DE LIMA](https://appshunter.io/developer/1883397199)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 40 MB
- Languages: American English
- Released: 2026-03-30
- Data updated: 2026-07-24
- User reviews in markdown: https://appshunter.io/ios/app/pipedn/id6760237428/reviews.md

## What is PipeDN?

Need to determine the pipe size for a new industrial project? Want to check the maximum recommended flow rate for an existing fluid line?

PipeDN is the ultimate pocket tool for industry professionals. Quickly find the ideal Nominal Diameter (DN) or maximum operating flow rate using velocity limits based on practical, field-tested engineering standards.

Beyond delivering the exact requirement, the app generates a smart reference table of neighboring commercial pipe sizes (larger and smaller). This gives you the comprehensive technical data to choose the best design alternative for your facility.

Highlighted Features: 
• Calculation Modules: "Find Ideal DN" and "Find Max Flow". 
• Native support for multiple pipe materials and schedules. 
• Professional PDF Reports: Export a detailed calculation memory directly to PDF. Include specific pipeline TAGs for customized, ready-to-archive engineering results. 
• Custom Units: Fully adapt pressure, temperature, flow rate, and diameter unit sets to match your region's standard. 
• Embedded Physical Tables: The Steam module features built-in thermodynamic properties for precise dynamic density tracking.

Supported Fluids & Applications: 
• Water & Condensate: Treated Water, Condensate (Pump Discharge, Pump Suction, Steam Trap Return). 
• Steam: Advanced sizing targeting Saturated Steam and Superheated Steam lines. 
• Process Gases: Combustion Air, Flammable & Non-Flammable Gases, N₂, O₂, LPG. 
• Compressed Air: Limits tailored for Main Lines and Secondary Branches. 
• Vacuum Systems (Manifolds, Separators, Blowers). 
• Pulp & Paper Industry Niche: Exclusive calculation module for Cellulose Pulp responding to various consistency levels (up to 6%), as well as comprehensive chemical recovery liquors (Black Liquor in 4 concentrations, Green Liquor, Lime Mud, Dregs, Filtrate, Alkalis, and Tall Oil Soap). 
• Common Chemicals: Sodium Hydroxide, Sulphuric Acid, Antifoams, and Lubricating Oils.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| PipeDN Pro | $7.99 | per month |
| PipeDN Pro | $49.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PipeDN Pro | $79.99 | one-time |



## Version history (last 4 releases)

### 1.0.3 — 2026-07-19

• New Cellulose Pulp Consistencies: Added 4.5% and 5.5% consistency options for even more precise calculations in pulp line sizing.
• Dark Mode Improvements: Refined button contrast and card styles for a seamless experience in low-light environments.
• Bug Fixes & Performance: Minor visual polishes and navigation performance optimizations.

### 1.0.2 — 2026-07-01

In this version, we bring important sizing updates and subscription model adjustments:

- Added support for pipe diameters up to 40 inches (including the new 30-inch size).
- Simplified subscription plans to a single Annual Pro option.
- Applied flow rate limits (up to 100 m³/h) and fluid restrictions for the free tier.
- Fixed version display issues in the settings screen and applied general stability improvements.

### 1.0.1 — 2026-04-03

In this update, we fixed an issue affecting the calculation display in the Pulp report. We also made stability improvements and minor under-the-hood fixes to ensure the app runs more smoothly. Update now for the best experience!

### 1.0 — 2026-03-30

No release notes.

---

*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 2026-07-24.*