API 6A Casing Head/Casing Spool Oil Well Drilling high quality

API 6A Oil Well Drilling Casing Head/Casing Spool Feature 1.The spool is made of alloy steel and heat-treated. It is used on the oil and gas well which is with a pressure of less than 105Mpa. It is tested according to ((SY/T5053.1-2000 BOP and control equipment, BOP)) before shipping to be used safely. 2.The spool applies to drilling high pressure oil and gas well, the connecting of the by passage of the spool with the valves and pipes will play not only a role of blowout and