Geothermal Wellhead Program

Oil price is rising recently, and we get some tenders for geothermal wellhead from different countries. Geothermal wellhead is one kind of special wellhead which is used for steam. Wellhead program is simple, but it refers to different standard. Normally, wellhead is designed and fabricated according to API 6A. But for geothermal wellhead, the master valve is normally fabricated to API 6D.

Maybe some friends will ask how 6A flange can connect with 6D flange. If you compare with ASME standard, you will find that for low pressure connection, 6A and 6D adopt flange size from ASME. So 6D mater valve can connect with 6A Casing house.

Below is two G.A drawing which will show you more and clearly.