Engineering Plaistow, N.H. model H-21000-2-90 liquid methane storage tank, built in 1970, rated for 90 PSIG maximum allowable working pressure with external vacuum at +100 degrees Fahrenheit. Maximum weight of contents is 78,400 lbs., with minimum design metal temperature of -320 degrees Fahrenheit at 90 PSIG. Head radius is 2:1, with minimum head thickness of .704 and shell thickness of .710.
Specification:
90 PSIG W/EXT. Vac at +100 degrees Fahrenheit (Max. Allowable Working Pressure)
-320 degrees Fahrenheit at 90 PSIG (Min. Design Metal Temperature)
Year Built: 1970
HD RAD: 2:1
MIN HD. THK:.704
SHELL THK:.710
Maximum Weight of Contents: 78,400 Lbs.
Questions buyers ask
What is the current vacuum reading, and what is the NER?
The listing does not provide current vacuum readings or normal evaporation rate data. Ask the seller for recent vacuum hold performance, annulus pressure trend, and NER measurements taken within the last six months, as these are critical indicators of insulation condition on a 1970-era tank.
What product has it held, and what can it be converted to?
The listing specifies this tank was designed for liquid methane service at -320°F minimum design metal temperature. Generally, cryogenic vessels built for methane or LNG can handle other products with warmer service temperatures (such as liquid nitrogen at -320°F or ethylene at -155°F) without rerating, but any conversion requires reviewing the original metallurgy and ASME stamping against the proposed service.
Is the data plate legible, and is the U-1A available?
The listing does not confirm data plate condition or U-1A form availability. Request photos of the data plate showing the ASME stamp, National Board number, and manufacturer's serial number, along with a copy of the original U-1A Manufacturer's Data Report, as both are typically required for registration and jurisdictional inspections.
General guidance for this type of equipment. Ask about this specific unit in your inquiry — the seller answers directly.
Inspection, shipping & payment
Inspection
Pre-purchase inspections are welcome during normal business hours by appointment arranged in advance. We can provide complimentary transportation from DFW Airport and back if you would like to send someone to see the equipment in person. We can also walk through the item over a video call for domestic or international buyers. We are on US Central Time.
Shipping and loading
The equipment is located at our yard south of Dallas, Texas. We can assist with shipping arrangements.
Loading is provided at no charge for equipment under 15,000 lb when scheduled in advance. Equipment over 15,000 lb requires a crane, which is arranged and paid for by the buyer.
Payment
Payment in full is required FOB our yard in South Dallas. A verifiable cashier's check is accepted for collection in person. For release to a third-party shipper we require a wire transfer cleared in our account before the equipment leaves the yard.
Used