Tank Service Q&A: CLADDING FOR INSULATION REQUIRED UNDER SPECIAL PROVISION TP38

Question:  This question pertains to cladding for insulation required under special provision TP38. Do we need to use stainless steel cladding when insulating tanks with 4″ insulation (as required for PIH products)?”

Tank Guru:  The insulation requirement for toxic products which are considered an inhalation hazard (special provision TP38) is as follows:  “Each portable tank must be insulated with an insulating material so that the overall thermal conductance at 15.5 °C (60 °F) is no more than 1.5333 kilojoules per hour per square meter per degree Celsius (0.075 Btu per hour per square foot per degree Fahrenheit) temperature differential. Insulating materials may not promote corrosion to steel when wet.”

In the simplest terms, 100mm (4″) of any of the normal insulating materials used on tank containers (mineral wool, fiberglass, polyurethane, etc.) more than meets the requirement.  And while it is most common to see tanks carrying PIH products with SS cladding, this is not required and any jacketing material will work.

Read more on TP38

4 thoughts on “Tank Service Q&A: CLADDING FOR INSULATION REQUIRED UNDER SPECIAL PROVISION TP38

  1. Stainless Steel Cladding Reply

    This Special Provision TP38 should really require cladding for installation because any normal insulating materials especially used on tank containers should more than meet the requirements.

  2. Jackson Reply

    why the iso tank container external cladding when after completed new bulid from china (cold weather) to singapore. The cladding become wobby without any impact sign evidance. Thanks

    • tankguru Reply

      You should really report the problem to the manufacturer, and work with them to investigate the problem and come up with a solution.

  3. Paul Sireci Reply

    In my case, a recently built tank exhibited the ‘wobbliness’ referred to by Jackson. The manufacturer determined that it was due to (coefficient of) expansion issue. Consequently, the fit-up and fastening was adjusted (the gap at the seam joints was fractionally increased to allow for any expansion in the cladding).

    It appeared to work because the waviness disappeared in subsequent productions.

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