Showing Posts From
Pipe sizing
This tag page collects 7 TradesQuote articles related to Pipe sizing. Use it to browse contractor-focused guidance on sizing, code, cost, diagnostics, and estimating without hunting through the full blog archive.
Each post below is written for people who bid and run trade work — HVAC and electrical contractors, estimators, and technicians who need clear explanations they can apply on the next job. Skim the summaries, open the guides that match your question, then follow related calculator links when you need interactive numbers.
Featured reading in this collection includes: Plumbing Formulas in Google Sheets: Stop Filling Down; Plumbing Formulas in Excel: Which Ones Survive a Spreadsheet; How Many Fixtures Can a 3/4 Inch Line Serve?; Friction Loss in Water Pipes: Hazen-Williams Without the Nomograph. Open any article for full detail, examples, and links to free tools that support faster estimating.
Looking for a broader topic? Browse all tags from the tags index, or jump to HVAC and electrical categories for curated topic hubs. TradesQuote also offers free calculators and an AI estimator when you are ready to turn a job description into a line-item quote.
Guides in this tag
- Plumbing Formulas in Google Sheets: Stop Filling Down
Every plumbing formula pastes into Google Sheets unchanged, so the interesting question is what you would build differently. One formula per column instead of one per cell, QUERY instead of a pivot table, and a 189-character interpolation collapsing to =WSFU_TO_GPM(B2).
- Plumbing Formulas in Excel: Which Ones Survive a Spreadsheet
Twenty-seven of the thirty-five plumbing formulas paste into a cell unchanged. Eight are IPC code tables wearing a formula as a hat — and those are the ones that quietly go stale in your sheet.
- How Many Fixtures Can a 3/4 Inch Line Serve?
Fewer than almost anyone guesses — about six fixture units on velocity alone, and fewer once the run is long enough to matter. Why the question needs a length attached before it has an answer.
- Friction Loss in Water Pipes: Hazen-Williams Without the Nomograph
Two exponents explain every surprise in pipe sizing. Double the flow and friction goes up 3.6x; double the diameter and it falls 23.8x. Plus the fittings a tape measure never sees.
- Water Velocity in Pipes: The 8 and 5 ft/s Limits Nobody Can Cite
Everyone quotes 8 ft/s cold and 5 ft/s hot as though it were code. It is not in the IPC or the UPC — it is design practice, and knowing that changes how you argue about it.
- Low Water Pressure in a House: Static vs Flowing, and What Each Tells You
One gauge reading diagnoses nothing. Static pressure tells you what the street gives you; flowing pressure tells you what the house destroys. The two readings together name the fault — with the friction numbers worked through.
Related resources
- 07 Sep, 2026
Plumbing Formulas in Google Sheets: Stop Filling Down
Every plumbing formula pastes into Google Sheets unchanged, so the interesting question is what you would build differently. One formula per column instead of one per cell, QUERY instead of a pivot table, and a 189-character interpolation collapsing to =WSFU_TO_GPM(B2).
- 06 Sep, 2026
Plumbing Formulas in Excel: Which Ones Survive a Spreadsheet
Twenty-seven of the thirty-five plumbing formulas paste into a cell unchanged. Eight are IPC code tables wearing a formula as a hat — and those are the ones that quietly go stale in your sheet.
- 04 Sep, 2026
How Many Fixtures Can a 3/4 Inch Line Serve?
Fewer than almost anyone guesses — about six fixture units on velocity alone, and fewer once the run is long enough to matter. Why the question needs a length attached before it has an answer.
- 04 Sep, 2026
Friction Loss in Water Pipes: Hazen-Williams Without the Nomograph
Two exponents explain every surprise in pipe sizing. Double the flow and friction goes up 3.6x; double the diameter and it falls 23.8x. Plus the fittings a tape measure never sees.
- 04 Sep, 2026
Water Velocity in Pipes: The 8 and 5 ft/s Limits Nobody Can Cite
Everyone quotes 8 ft/s cold and 5 ft/s hot as though it were code. It is not in the IPC or the UPC — it is design practice, and knowing that changes how you argue about it.
- 03 Sep, 2026
Low Water Pressure in a House: Static vs Flowing, and What Each Tells You
One gauge reading diagnoses nothing. Static pressure tells you what the street gives you; flowing pressure tells you what the house destroys. The two readings together name the fault — with the friction numbers worked through.
- 02 Sep, 2026
Water Pipe Size Chart: GPM and Fixture Units to Nominal Size
A pipe size chart that shows its working. 10 gpm is 3/4 inch at 60 psi over 120 ft — and 15 gpm needs 1-1/2 inch at 40 psi over 400 ft. Why every row is conditional.
Frequently asked questions
Common questions about Pipe sizing guides on the TradesQuote blog.
What will I find under Pipe sizing?+
This tag lists 7 published guides tagged or categorized as Pipe sizing. Topics typically include sizing, cost estimating, diagnostics, and practical contractor workflows tied to that subject.
Are these articles a substitute for code or engineered design?+
No. TradesQuote guides explain concepts and estimating shortcuts so you can work faster and communicate clearly. Always follow applicable codes, manufacturer instructions, and professional engineering requirements for the job.
How do these pages relate to TradesQuote tools?+
Many articles link to free HVAC or electrical calculators and to TradesQuote estimating features. Use the guides to understand the topic, then use the tools to produce numbers for proposals and field checks.