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How to use Pipewise

Pipewise puts pipe, fitting, flange and bolting dimensions next to 20 field calculators, with 3D models you can turn. Everything works offline. This guide covers the main features and a few shortcuts.

Questions or a value that looks wrong? Email hello@sterin.dev.

First launch
The Home screen
Search
Reference tables
3D models and drawings
Calculators
Typing numbers: the keypad
Saving, sharing and pinning
Settings
Calculator quick reference
Reporting a problem
Good to know

1. First launch

Choose how you measure:

Imperial: inches, feet-inch-fractions, psi, °F
Metric: millimetres, bar, °C

Pipewise suggests one based on your phone’s region. Tap Start. You can change units any time in Settings, and every value converts straight away.

2. The Home screen

Search bar at the top: the fastest way to any number (see Search).
Your pipe size: a 3D model of the selected size with a weld-neck flange.
- Drag the tape-measure ruler or tap − / + to change size. The yellow needle marks your size.
- The size you pick here becomes your working size. Every table and calculator opens at it, so you set it once.
- Below the ruler: outside diameter, standard wall and 90° long-radius centre-to-end for that size.
- Everything for [size] opens one page with that size’s pipe, fittings, socket-weld, flange, gasket and valve figures.
- Tap the full-screen icon on the model to turn and zoom it.
Pinned: your favourite tables and calculators. Tap the ★ on any page to add or remove it.
Recent: the last few things you opened.

The bottom bar switches between Home, Tables, Calculators and Saved. Tap the current tab again to go back to its first page.

3. Search

Search gives you the answer itself where it can, not just a list of pages. Try:

Type	You get
`6 sch 80`	Wall, inside diameter and weight of 6″ Schedule 80
`4 300 flange`	Bolt circle, number and size of studs, stud length for a 4″ Class 300 flange
`2 elbow`	Elbow centre-to-end dimensions for 2″
`DN150`	The NPS size and its key dimensions
`rolling offset`, `torque`, `stud length`, `spiral wound`	The matching calculator or table

Sizes can be written as 1 1/2, 1-1/2, 1.5 or DN40. Classes can be written 300, 300# or class 300.

4. Reference tables

Open Tables to see them grouped by colour (the colours follow the ASME A13.1 pipe-marker scheme):

Pipe (green): dimensions to ASME B36.10M / B36.19M, every schedule, with weight, volume, area, moment of inertia and section modulus
Fittings (blue): buttweld (B16.9), stub ends, socket-weld and threaded (B16.11), olets and swages
Flanges & gaskets (yellow): B16.5 flanges Class 150–2500, gaskets (B16.20), pressure–temperature ratings
Valves (red): face-to-face (B16.10)
Bolting & threads (orange): studs and nuts, NPT threads
Materials (brown): matching ASTM specs, strengths, P-numbers

On each table page:

Choose the size (and class, schedule or fitting type where shown) from the chips. Your choice becomes the working size.
One size shows every value for that size. Full chart shows all sizes at once; scroll sideways for more columns and tap a size to jump back to it.
Tap any value to copy it to the clipboard. If it has a letter (A, T, Y…), that dimension lights up yellow on the drawing or model.

Flange note: for Class 150 and 300, thickness (T) and hub length (Y) include the 1/16″ raised face. For Class 400 and above they exclude the 1/4″ raised face. The labels in the app say which applies.

5. 3D models and drawings

Most tables and the layout calculators have a picture at the top. Use the switch in its corner to choose:

3D: a model in true proportions, built from the same numbers as the table, or from your inputs on a calculator.
- Drag sideways to turn it. Flick to spin.
- Double-tap to go back to the starting view.
- Tap full screen (the arrows icon) to orbit in any direction and pinch to zoom.
Drawing: the classic lettered fabrication sketch.

Lettered values link to both views: tap a lettered value in the list and it lights up in the picture.

To make drawings the default instead of 3D, turn off Settings → Show 3D models first.

6. Calculators

Open Calculators. Ones marked 3D draw your actual job as a model.

How every calculator works:

Tap a field and enter the value with the keypad. Choices like pipe size, fitting angle or material are chips, switches or pick-lists.
The answer card at the top updates as you type and stays visible while the keypad is open.
Tap the answer card to copy it.
Results below list every value. Tap a lettered one to highlight it on the picture.
Yellow boxes are warnings, for example when an offset is too tight for the elbows or a flange class is too low.

Each calculator remembers your last inputs. Tap the 🗑 icon at the top to reset it to the defaults.

7. Typing numbers: the keypad

The keypad has big keys designed for gloves.

Imperial lengths have ft ′ and in ″ keys and a row of one-tap fractions. Example: 10 ft 3 1/2 gives 10′ 3-1/2″.
You can also type 10' 3 1/2", 3-1/2, 3.5 or 7/8, or add a unit: 1.2m, 450mm, 2.5ft.
Metric lengths are millimetres unless you add a unit.
The line under the number shows the same value converted, so you can check it before you go on.
The first key you press replaces the old value, like a calculator.
Press Next to move to the next field, or Done to close the keypad.
A hardware keyboard works too: Enter moves on, and Backspace deletes.

Save on a calculator stores the inputs and answer under a name you choose (for example “Line 12 tie-in”). Find it in the Saved tab and tap to reopen it with the same inputs. Swipe left to delete.
Share sends a text summary of the inputs and results to any app, for example WhatsApp, email or notes.
★ Pin puts a table or calculator on the Home screen.

9. Settings

Open Settings with the ⚙ icon on Home.

Units: imperial or metric
Round fractions to: 1/8″, 1/16″ or 1/32″
Appearance: Auto (follows your phone), Light, Dark, or Sunlight, a black-on-white theme with heavier lines for reading outdoors
Vibrate on tap
Show 3D models first
Questions, fixes and ideas: email the developer or report a problem

10. Calculator quick reference

Layout & fitting

Simple offset: travel, run and pipe cut length for any fitting angle, with long-radius, short-radius or no elbow takeout.
Rolling offset: enter the rise and roll, then the fitting angle or the run. Gives the true offset, travel, the angle to roll the fittings, and the cut length. The 3D model shows the job in its box.
Pipe cut length: centre-to-centre minus the takeout of each end fitting (buttweld, weld-neck flange, socket-weld, threaded) and root gaps.
Cut an elbow to angle: takeout plus the heel and throat marks for cutting a 90° elbow down to any angle.
Mitred bend: cut angle and segment lengths for a lobster-back bend.
Branch saddle template: fishmouth ordinates for a branch at any angle. Wrap a sheet round the branch, mark the lines and transfer each ordinate down from the baseline. The 3D model shows how the cut sits on the header.

Design & process

Wall thickness (B31.3): minimum wall and the lightest schedule that works.
Flow, velocity & pressure drop: Darcy–Weisbach for liquids.
Flange rating (P–T): maximum pressure for a class and temperature, and the lowest class that holds your pressure.
Hydrotest: test pressure, water volume and weight.
Blind / blank thickness: spectacle and paddle blanks to B31.3.
Thermal expansion: growth of a straight run, and an estimate of loop leg length.

Bolting & welding

Bolt torque: torque per pass, preload and tightening order.
Weld metal & rods: filler needed for single-V butt welds.
Pipe weight & volume: empty and full weight for lifting.
Paint & insulation: surface area, paint quantity, cladding area.

Field maths

Slope & drain fall, Right triangle, Fractions & decimals, Unit converter.

11. Reporting a problem

If a number doesn’t match your standard or something doesn’t work:

On a calculator, tap Something look wrong? Send these inputs. Your email app opens with the inputs and results filled in.
On a table, tap Report a value. The table and size are filled in for you.
Or use Settings → Report a problem, or write to hello@sterin.dev.

Nothing is sent until you press send in your email app. Every message is read, and fixes ship in updates.

12. Good to know

Works offline: no signal is needed on site.
No ads, no subscription, no account. One purchase unlocks everything.
Your data stays on your phone. See the Privacy Policy.
Accuracy: values come from ASME B36.10M, B36.19M, B16.5, B16.9, B16.10, B16.11, B16.20, B1.20.1 and MSS SP-43/95/97. Olet and swage figures are typical manufacturer values. Pipewise is a field reference, not a substitute for the current edition of the standards, your project specification or a qualified engineer. Check critical dimensions before you cut.

Made in the United Kingdom by an Indian developer · hello@sterin.dev