available for API tubing threads

API Tubing Spool

1. Structure
Tubing head is usually a spool with both flanged ends, which is set on the top flange of casing head to hang tubing hanger and seal the annular space between the tubing string and oil-layer casing and which consists of tubing head spool and tubing hanger.
2. Functions:
1) Hang the tubing string inside well;
2) Seal the annular space between tubing and casing;
3) Give a crossover to connect casing head downwards and to connect Christmas tree upwards;
4) Provide both side outlets in tubing head spool body through which to execute injection and wellwash operation.

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