GFI Composites Ltd. was asked to design and supply light weight drifts of various diameters to offshore Oil and Gas customers.
These drifts have to meet existing criteria including meeting tolerances of +/- 0.001″. In addition, they have to be light weight; chemical and corrosion resistance; excellent abrasion resistance which will not shrink or swell in any weather condition; and possess good impact strength.
Teflon drifts can grow or shrink .007″ from the finished dimension with moderate temperature changes. The OD tolerance should therefore be considered when ordering these. A minimum .007″ over nominal is recommended. Teflon drifts are recommended for drift sizes 4″ diameter and under.