Tank Insulation2024-03-06T12:11:19+02:00

Tank Insulation

Cryogenic Insulation for Gas Carriers

LR Marine AS in cooperation with Marine Gas Insulation AS are offering a variety of services for the marine gas market, covering both new buildings and retrofit:

  • Complete tailor made insulation solutions
  • General engineering services for thermal insulation
  • Feasibility studies, economical and technical analyses
  • Repair programs and cost estimates
  • Documentation for class approvals
  • Project management
  • Supervision and manpower for installation
  • Training of ships crew for insulation maintenance and repair
  • Inspection and status reports for repair and maintenance of vessels in operation
  • Turnkey supply comprising all or part of the above

Spray Foam Insulation

The Spray Foam System is developed to improve insulation efficiency, minimize maintenance and reduce application time. Our Spray Foam System is based on a long experience from working with polyurethane foam for LPG, LEG and LNG cargo tank insulation.

System Description

The Spray Foam System consists of two types of materials; a polyurethane foam for low temperature insulation, and a polymeric coating for surface protection.
The foam is sprayed on the tank surface in 5 to 10 layers until a total insulation thickness of >120 mm for LPG and > 180 for LEG. Insulation thickness for LNG is from 250 mm to 300 mm. The surface thickness tolerances is +10/-5 mm. Coating is sprayed on the foam surface with a thickness of 3 mm on top of the tank and 1 mm on sides and bottom.
The spray system is a bonded insulation system with flexible materials. Foam and coating will follow the contraction and expansion of the tank.


The insulation system is designed to fulfi l requirements from all the classification societies.
The system is approved for LPG and LEG projects by:

  • Lloyd’s Register
  • Germanischer Lloyds
  • Det Norske Veritas

The system is approved for LNG projects by:

  • Germanischer Lloyds

Why Spray Foam Insulation?

  • Very short application time at the ship yard
  • Improved weather exposure resistance during assembly
  • No protection needed for storage of insulated tanks outdoors
  • Improved insulation life time
  • No maintenance in operation
  • The best thermal efficiency


Insulation System

  • The risk of voids in the insulation is eliminated by the spray method
  • No joints in the foam, hence increased tightness
  • Homogeneous insulation
  • Increased insulation efficiency
  • Non-corrosive and watertight cladding
  • Complete bonding to all surfaces
  • No space for moisture accumulation
  • Excellent corrosion protection

Application Method

  • The visual control during spray application secures the quality
  • Insulation applied by 4 to 6 skilled operators
  • Onboard or on land application
  • Easy to repair
  • Low material consumption
  • Easy material handling
  • Small storage volumes
  • Short application time



  • Premixed Polyols and Isocyanate
  • Foam density 38 kg/m3 +/- 10%
  • Flammability, B2 – DIN 4102, Part 1, and ASTM D365
  • HFC foam with ODP
  • (Ozone Depletion Factor) = 0
  • Accepted in accordance with the Montreal Protocol and later amendments


  • Two components polymeric coating – solvent free
  • Density 1.1g/cm3±10%
  • Flammability, B2 – DIN 4102, Part 1, and ASTM D365
  • Thickness from 1 mm to 3 mm depending on the surface location


Finite Element Analyses – Thermal and Structural

  • Linear
  • Non-linear
  • Static
  • Transient
  • Contact

3D Modeling

  • Concept modeling
  • Presentation drawings
  • Production drawings


  • Physical cryogenic testing
  • Technical feasibility studies
  • Insulation design and system documentation
  • Class approvals
  • Heat transfer and boil-off rate calculations

Repair and Maintenance

A well maintained insulation system saves costs and operates environmentally friendly. LR Marine in cooperation with MGI offers engineered and cost-effi cient solutions for application worldwide. We have the technology and the experience to maintain, repair and improve existing insulation on all types of gas carriers.

Cargo Tank Insulation

  • Inspection and status reports for repair and maintenance of ships in operation, including repair procedures and cost estimates.
  • Supply of engineering, supervision, materials, and installation for repairs during docking or voyage.
  • Repair or upgrade of LPG/LEG cargo tank insulation by using polyurethane spray foam and polymeric coating.
  • Part or full replacement of existing insulation onboard during docking. All materials and systems are approved by classification societies.
  • Full replacement will give the same properties as for a new building, and can meet “NEW” demand for BOR.
  • Renewal of insulation can be done area by area to fit the vessel operation program.
  • Training and instruction to ships crew for maintenance and repair of insulation.

Pipe Insulation

  • Repair of pipe insulation by use of one or two layers of PU insulation section with GRP or glass cloth and mastic.
  • Pre-insulated pipe systems in cooperation with LOGSTOR.
  • Replacement of pipe HDPU pipe supports including steel cradles/supports.
  • Worldwide material deliveries, installation and supervision.

Spherical LNG Tanks

Maintenance / Upgrade – Program

  • Repair or upgrade of cargo tank insulation by use of polyurethane spray foam and cryogenic coating
  • No removal of main existing insulation
  • Reduced boil-off rate
  • Vapour tight system
  • Reduced inert gas consumption
  • Efficient application
  • Renewed insulation system
  • System approved by classification society

Panel Insulation

IMO Type A – LNG Fuel and Cargo Tanks

Innovative Insulation System developed by MGI is to be used in combination with Jahre Groups new designed tank solution for LNG Cargo and Fuel.

  • Insulation with full secondary barrier
  • Designed for temperatures down to – 163oC.
  • Minimizing boil off by restricting heat ingress.
  • Protecting the hull structure against harmful temperature fluctuations and absolute temperatures during operation.
  • Acting as full secondary barrier in case of leakage on LNG tank.