• Mission Supreme Liner

    NOV Mission supreme liners are precision machined to exacting tolerances to keep the liner concentric to the liner guide and flat to the fluid end (or wear plate). This reduces the possibility of misalignment.
    Description

    National Oilwell Varco Mission supreme liners are manufactured using only the highest-grade materials. The outer section, or shell, is manufactured from high strength carbon or alloy steel and heat-treated to provide optimum mechanical properties. It is precision machined to exacting tolerances to keep the liner concentric to the liner guide and flat to the fluid end (or wear plate). This reduces the possibility of misalignment on installation and provides the end user with longer liner and piston life.

    The inner section of Mission liners, or the liner sleeve, is manufactured from a proprietary high chrome content iron alloy that offers excellent resistance to wear. The high percentage and thorough distribution of chrome carbides in conjunction with controlled heat treatment for maximum metallurgical properties, prior to assembly in the shell, gives a very high degree of uniformity in microstructure and wall section hardness. This results in a sleeve that has excellent abrasion, erosion and corrosion resistance. The sleeve is through hardened during heat treat to provide high material hardness at all depths throughout the material. This material and process allows the end user to have basically the same surface hardness of the sleeve in the new condition and throughout the product life. The sleeve is manufactured to the bore tolerances specified by API or better to provide longer life by reducing gaps between the liner bore and piston.

    Refer to the Drilling Expendables Databook for part number information.

    Features/Benefits

    • Liner outer shell manufactured from high strength carbon or alloy steel and heat-treated
    • Liner sleeve manufactured from a proprietary high chrome content iron alloy
    • Excellent resistance to abrasion, erosion and corrosion
    • Extended run times