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Offshore Cryogenic Tanks

Offshore Cryogenic Tanks

Hoover offers Offshore Cryogenic Tanks for the safe handling, transportation and storage of liquid nitrogen, primarily for wells, pipeline, and processing equipment operations.  These cryogenic bulk tanks are designed and manufactured to meet DNV, EU Directive 1999/36/EC and EN 13530 standards. Frames meet DNV 27-1 standards.

Our offshore cryogenic tanks are designed for use on offshore platforms and rigs and are configured to fit in the confined spaces found on oil rigs. They are constructed to safely store high pressure liquid nitrogen and withstand the harsh offshore environment. Stainless steel is used for the inner vessel, piping, valves, instruments and welds, providing strength, superior corrosion resistance and easy clean-up between loads. The external shell is constructed of carbon steel treated to provide corrosion resistance. The storage frames are designed for safe and secure stacking during transport and are available in bolt-down options. Safety features include dual relief valves in the inner tank and safety discs on the outer tank.

Fittings and Accessories

Valve Type: Herose & Rego valves offered on standard tanks.
Piping Option: Incorporates a direct rear fill to allow for concurrent fill/liquid decant

Frame & Tanks Design

The frame and tank is design to carry LIN and LAR. As Liquid Argon has a greater specific gravity than Liquid Nitrogen, the fame and tank supports are design to carry an increase payload of approximately 4,200Kg.

The oil and gas industry uses LIN only in this type of vessel which has a M.G.W. of approx. 11,500Kg. The “LIN Only” tank and frame are designed to meet the higher payloads.

As the tank is design to have a greater M.G.W. by 4,200Kg than the other competitors tanks, this should serve the customer to have a more robust and longer life which would add to their R.O.I.


Swipe left to view additional table data.

Technical Specification for 6 Bar 10’ ISO Offshore Cryogenic Tank

 Quantity:  TBA
 Tank Type:  IMDG T75, DNV 2.7-1, EN12079, 10’ ISO Cryogenic Tank in Rectangular Frame


 Frame Dimensions:  2991 x 2438 x 2591mm high (10’x 8’ x 8’6” high ISO)
 Capacity:  7,890L gross +/-2%
 Cargo:  Liquid Nitrogen (LIN)
 M.G.W.:  11,432 kg (LAR)
 Tare (est.):  5,300kg
 Max Payload:  6,132 kg (LAR)
 MAWP:  6 Bar
 Test Pressure:  9.46 Bar


 Design Temp:  -196°C to +50°C
 Holding Time:  25 days
 Evaporation rate:  0.4 % per day
 Inner Shell Material:  304 Stainless Steel
 Outer Shell Material:  355 Carbon Steel
 Corner Castings:  4 top and 4 bottom
 Insulation:  Super insulation with high vacuum
 Piping:  Minimum SCH 10 316 SS


 Frame Material:  

EN 10219 S355 J2H on primary structure,

EN 10028 S355 J2G3 on Padeyes

EN 10219 S275 J2H on secondary structure

ISO bottom type Corner castings on top & bottom corners(x8)

  • External Finish: Frame/Cradles/Vessel
  • Shot blasted to Swedish standard SA 2 1/2.
  • International Paint System
  • Prime with 1 coat of zinc rich epoxy (Interzinc 52) to a nominal d.f.t. of 50 microns. Intermediate coat of micaceous iron oxide (Intercure 200) to a nominal d.f.t. of 100 microns.
  • Finish with 1 topcoat of epoxy acrylic isocyanate free (Interfine 691) to a nominal d.f.t. of 50 microns.
  • Overall nominal d.f.t. 200 microns Colour: TBA (Frame)
  • Colour: TBA (Cradles/Vessel)
  • Slings: Included
  • ISO Connectors: Optional
  • Forklift Pockets: 2 off in 300mm x 150mm x 6mm Carbon Steel box-section, Slotted, 1200mm between Centres.
  • Walkway: Aluminium
  • Rear Ladder: Welded Rear Ladder
  • Connections: NIT 150 S/S with Nylon Dust cap (Welded)
  • Vacuum Port: Saunders Diaphragm Valve (1 1/2”)
  • Vacuum Measurement: Hastings DV-6R Vacuum Gauge
  • Vessel Design Code: ASME VIII Div.1
  • Inspection Agency: Lloyd’s Register
  • Test Requirements: As per DNV 2.7-1, EN12079, ISO 1496-3:1995
  • Pressure test (Hydro or Gas) @ 1.3 x MAWP (+ 1 Bar for Vacuum insulated) Leak test & Service equipment test (Gas) @ 0.9 Bar x MAWP
  • Approvals: IMDG T75, ADR/RID, DNV 2.7-1, EN 12079, TIR, EN 13530
  • Approval Details: LR 7044
  • Pressure raisingStainless steel finned tubing 316L
  • Sign Writing: Standard Decal Layout with Customer Logo
  • (Customer to Provide Details on the logo)
  • Marking: Cross hatching on top rail
  • Customer Number to be welded to frame (beside ladder on bottom rail)
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    Customer Information

    Application Information

    Bolt Down Cradle

    This picture shows the bolt down cradles onto the frame. These cradles have been design in big box feet to reduce any loads/stresses that may be transferred into the tanks during transportation.

    The addition of the bolt down cradles makes it easier for the customer/operator to maintain or service there tank and frame over time.

    The cradle/doublers has been designed to meet the higher payload (LAR) of 15,644Kg and has been rail impacted tested at this M.G.W.