Specification #JI 0304
(Semi-rigid Fiberglass with Galvanized Steel Jacket)

  • The insulation medium is purpose – manufactured semi-rigid premium quality
    fiberglass wrap with Kraft lining and foil vapor barrier. The fiberglass filaments
    are laminated parallel to the facings for enhanced flexibility and maximum

Installed Density:

2.5 lbs./cu ft

R. Value:

4.17 per inch

Thermal Conductivity:

K=0.24 Btu-in/hr-sq
@ 75 ºF mean

Standard Thickness:

2 inches (R-8

Optional Thickness:

3 inches (R-12

Max Thickness:

4 inches (R-16

  • After installation, the insulation is clad with a galvanized
    steel jacket secured with #8 sheet metal screws and painted with 2
    to 3 mils of high gloss alkyd enamel. Color is light gray.

  • All tank connections are recessed and the ASME nameplate exposed. All seams are caulked with pigmented silicone for weather protection. Regular inspection and re-sealing as necessary is required.

Jacket Thickness:

24 gage
(.0239″/.607 mm)

Finish: Outside:

2 to 3 mils alkyd
enamel over galvanizing

  • (IMPORTANT: Minor shipping damage is more noticeable on jacketed
    tanks due to the uniform finish and the nature of the jacket. Extra
    lugs are installed on jacketed vessels for securing the tanks during
    shipment and they are normally palletized and shipped on a flat bed.
    Even so, minor cosmetic damage can occur and must be considered normal.

  • Rev. 102320171855