Used High Pressure Gas Storage for Sale

Equipment that stores gas compressed at high pressure rather than as a cold liquid: tube skids and tube trailers, ASME pressure vessels, DOT cylinders, and banks built from them. Tubes like these are commonly rated in the 2,400 to 4,000 psi range.

Sources: FIBA tube trailers · Gas Innovations HP tubes

Two ways. Water volume (cubic feet, gallons or liters) is the physical size of the tubes. Gas capacity in standard cubic feet (scf) depends on fill pressure and the gas. Helium and nitrogen usually come out close, while natural gas fits noticeably more scf in the same tubes, so ask for capacity in your gas.

Sources: FIBA tube trailers · Gas Innovations HP tubes

DOT 3AAX and 3T tubes are requalified every 5 years. 3A and 3AA cylinders run on 5, 10 or 12 years depending on conditions; the 10-year star rule is limited to certain non-corrosive gases. Only a requalifier with current DOT approval can do the work. A passed cylinder is stamped with the requalifier's ID between the test month and year.

Sources: 49 CFR 180.209 · 49 CFR 180.205 · 49 CFR 180.213

ASME vessels are built for stationary use and inspected under the rules of the state where they're installed, which vary. DOT vessels follow the federal requalification schedule. Federal rules require compressed gas moved on the road to be in DOT-spec or UN containers, so a standard ASME vessel isn't for hauling product. Know which you're buying first, because it decides where and how the equipment can be used.

Sources: National Board NB-57 · 49 CFR 173.301 · 49 CFR 180.209

Requalification status first: a DOT cylinder that's overdue can't be filled and shipped until it passes. Look for dents, corrosion, cracks or abrasion, leaks, and any sign of fire or heat damage, since these all trigger testing before reuse. Confirm the stampings are readable, check valves, manifolds and relief devices, and have composite cylinders inspected under CGA C-6.2, keeping in mind their limited service life.

Sources: 49 CFR 180.205 · 49 CFR 173.301

ASME vessels: the data plate, the manufacturer's data report (such as a U-1A) and the National Board number. Most states require National Board registration for ASME-stamped vessels. DOT tubes and cylinders: the stamps should show the spec and service pressure, serial number, maker's mark, original test date, and each requalification date with the requalifier's ID. Both: get the gas service history.

Sources: National Board NB-57 · NB-264 · 49 CFR 178.35 · 49 CFR 180.213

It depends on the manufacturer and the vessel, so contact the manufacturer before changing service. Some limits are set by regulation: DOT 3T tubes aren't authorized for hydrogen, and hydrogen in 3A, 3AX, 3AA or 3AAX cylinders comes with steel-treatment conditions. Oxygen service requires cleaning for oxygen. On LNG specifically: that call is ours, not something the sources below set — we treat equipment built for LNG as staying in LNG service.

Sources: 49 CFR 173.302a · CGA G-4.1

Four things: how long until the next requalification is due; whether code stamps and paperwork are intact; which gases it can legally carry; and the condition of the pressure shell. Timing matters because an overdue DOT cylinder can't be filled for transport until it passes, and one that fails is condemned.

Sources: 49 CFR 180.205 · 49 CFR 173.301 · 49 CFR 173.302a