LoopWatt
Fire alarm and life safety. NFPA 72 inspections that become authority ready PDFs, battery calculations.
Cut overfill-prevention drop tubes right the first time. Get exact upper, lower, and total tube lengths for OPW, Franklin Defender, and EMCO valves—plus tank charts and a searchable dispenser & ATG error-code library, all built for the field.
Practical tools for petroleum service work—no fluff, just the numbers you need on site.
Enter your tank measurements and get exact upper, lower, and total drop tube lengths for OPW 71SO, Franklin Defender, and EMCO overfill valves.
Shutoff is solved at 95% of tank volume—the way a horizontal tank actually fills—instead of a rough 95% of height. The OPW method matches the 71SO worksheet, and the geometry follows the Georgia EPD drop-tube approach.
Build a calibration chart from tank diameter, length, and capacity in 1/8-inch increments to find the level you need.
Search dispenser and ATG codes for Gilbarco, Wayne, and Veeder-Root TLS-300/350/450/450 Plus/4i—with plain-English causes and troubleshooting.
Export a clean calculation report to share or keep on file, and pull up past jobs from your saved history.
English, Spanish, French, German, Hindi, and Chinese—so the whole crew can use it.
Skip the scratch-paper geometry—measure, tap, and cut with the right numbers.
Set overfill valves where they belong, with a record you can export and keep.
Shutoff math grounded in the 95%-by-volume standard, not a height shortcut.
DropTubeBuilder lives at the fill riser and the dispenser. USTex Guide covers the paperwork and the regulations that come with the same tanks. It was built by Doug Metzker, the licensed technician who runs USTEX LLC, an independent UST and AST compliance testing firm in Jackson, Wisconsin, so it is written from the field rather than from a desk. In one place you get state by state UST regulations for all 50 states alongside 40 CFR Part 280, more than 200 state compliance forms, monthly walkthrough and annual inspection log generators, a testing frequency planner, manufacturer tank calibration charts, red tag rules, and plain language overviews of PEI RP300, RP400, RP900 and RP1200. When the job in front of you is a deadline, a form or an inspector rather than a cut length, that is where we send people.
Field-ready on iPhone and iPad. Try it on your next drop tube job.
Same idea, built for other trades: everything bundled, fully offline, no account and no tracking.
Fire alarm and life safety. NFPA 72 inspections that become authority ready PDFs, battery calculations.
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Data centers. Methods of Procedure executed step by step, power and cooling calculators.
Battery storage (BESS). Battery calculators, BMS and PCS fault families, thermal and protection.
Utility scale solar. NEC calculators, inverter fault codes, SCADA and protection references.