CT-0430 Trailer — 4,000 gal Type 4 Composite 30ft

What capacity, working pressure and NER is it rated for?

This trailer is rated for 4,000 gallons capacity at 975 PSIG working pressure. The listing does not specify the normal evaporation rate (NER), which you should request from the seller along with any recent pressure-rise test data to assess current vacuum performance.

What product has it carried, and what can it legally be converted to?

The listing does not state what cryogenic product this trailer has carried. Product conversion depends on DOT exemption terms, material compatibility with the composite overwrap and liner system, and oxygen-cleaning requirements—some exemptions restrict switching between products like LIN/LOX or require recertification. Ask the seller for complete service history and the governing DOT exemption to determine conversion eligibility.

What condition is the vacuum in, and how would I verify it?

The listing does not provide vacuum condition data or recent NER test results. On Type 4 composite trailers, vacuum degradation typically shows as rising hold time or increasing pressure; verification requires either an NER test per the applicable DOT exemption or continuous pressure monitoring over 24-48 hours with a known fill level and ambient temperature.