16E.220.127.116.11 Subsea electrical equipment should meet the applicable recommendations of Section 16E.4.14. ... This system may serve as a backup control if the primary control systems are inoperative. ... prevent flow of nitrogen into the accumulator circuit and prevent hydraulic fluid from entering the nitrogen back-up circuit.
|Title||:||Recommended Practice for Design of Control Systems for Drilling Well Control Equipment|
|Author||:||American Petroleum Institute. Production Dept|