High pressure gas storage

Abstract

A storage wellhead allowing on-line system maintenance and testing is provided. Including at least two fluidically parallel gas passages adapted to allow testing or maintenance of one gas passage, while the other gas passage remains in service. The gas may be hydrogen. Also including at least two fluidically parallel liquid passages adapted to allow testing or maintenance of one liquid passage, while the other liquid passage remains in service. The liquid may be brine.

1 - 15 . (canceled) 
     
     
         16 . A method of on-line system maintenance and testing of a storage wellhead, comprising
 performing testing or maintenance on a first fluidically parallel and interchangeable hydrogen passage of a hydrogen wellhead spool passages while a second fluidically parallel and interchangeable hydrogen passage of the hydrogen wellhead spool simultaneously remains in service, or   performing testing or maintenance on a first fluidically parallel and interchangeable brine passage of a brine wellhead spool while a second fluidically parallel and interchangeable brine passage of the brine wellhead spool simultaneously remains in service.   
     
     
         17 . The method of  claim 16 , wherein the hydrogen passage testing occurs at predefined first intervals. 
     
     
         18 . The method of  claim 17 , wherein the predefined first interval is once a month. 
     
     
         19 . The method of  claim 16 , wherein the brine passage testing occurs at predefined second intervals. 
     
     
         20 . The method of  claim 19 , wherein the predefined second interval is once a month. 
     
     
         21 . The method of  claim 16 , wherein the hydrogen wellhead spool operates at a pressure of greater than 2400 psig. 
     
     
         22 . The method of  claim 21 , wherein the hydrogen wellhead spool operates at a pressure of less than 4000 psig. 
     
     
         23 . The method of  claim 22 , wherein the hydrogen wellhead spool operates at a pressure of less than 3000 psig. 
     
     
         24 . The method of  claim 16 , wherein the brine wellhead spool operates at a pressure of greater than 2400 psig. 
     
     
         25 . method of  claim 24 , wherein the brine wellhead spool operates at a pressure of less than 4000 psig. 
     
     
         26 . The method of  claim 25 , wherein the brine wellhead spool operates at a pressure of less than 3000 psig.