Circulating head 4-1/2" Premium Thread Pin x 1502 weco connection
Circulating swage 7” 38ppf P-110 Premium threads x 2” 1502 Hammer Union closed end thread protectors
Circulating sub 4-1/2” x 15.1ppf P-110 Premium coupled casing connection c/w 2” – 1502 Hammer Union closed end thread protectors manufactured from (PVC) and steel.
The Circulating head(Circulating swage) is a joint installed on the top of drill pipe, and the upper end is connected with the circulating system of casing, tubing and union thread to circulate drilling fluid. Tianjin Forwell's Circulating sub can be divided into casing Circulating head, tubing Circulating head,union Circulating head and tee joint.