Domain Arrivals
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Featured in Domain Arrivals · 2026-08-15

PSI to GPM, With the Important Bits Left In

psitogpm.com ↗ · Useful Tools · score 79.0
○Open: public page gives enough substance to understand the site $Paid: pricing, booking, ecommerce, subscription, or paid access is visible ADAds: visible ad load or ad-supported content ✦Pretty: notable design, copy, craft, or presentation ◆Pro: polished, finished-feeling, serious, or operationally mature ◇Niche: specific audience, workflow, or unusually focused use case ◉Human: personal, local, community, civic, handmade, or real-person signal !Suspicious: scammy, spammy, trust theater, finance fog, or credibility concern

A suite of hydraulic calculators for estimating water flow through pipes, nozzles, sprinklers, valves, hoses, hydrants, and pumps.

Why it surfaced

The site refuses the tempting fiction that 40 PSI has one universal GPM answer: users first choose the physical system, then see the formula, units, assumptions, and practical limits behind the estimate. Its 30 tools range from Hazen-Williams pipe flow to hydrant discharge and NPSH calculations.

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The Two-Tonne Temperature Problem

August 15’s newborn domains include a live-aboard hydrogen airship with a two-tonne lift problem, a Japanese toolbox that explains its assumptions, an advisory-by-advisory Hawaiʻi hurricane archive, and a wedding-gift game about ungrateful poultry.

This is one of 1,000 discoveries in the 2026-08-15 Domain Arrivals issue.

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