4. Typical Size

Size	Outside Diameter mm	Permissible Variations in Outside Diameter mm	Wall Thickness mm	Average Wall Permissible Variations in Wall Thickness
89×4	89	±0.85%D	4	±10%S

  Note: The control scope of the standard：OD：±0.85%Dmm，WT：±10%S

5. Typical Application Environment

    1）Chemical  Equipment

    2）The equipment pipes of petrochemical and petroleum

    3）Waste water treatment 

    4）Heat  Exchanger

    5）Fluid Service

    6)  Power  station

    7) New energy and environmental protection

    8) Aerospace

    9) Ships

    10) Medical Equipment