DRILL STEM CIRCULATION SUB
A class with identifier
http://staging4.data.posccaesar.org/iso/15926-4/rdl/RDS17511940
| Definition | A <DRILL STEM CIRCULATION SUB> is a <DRILL STEM SUB> for circulating mud around and/or through the drillstring or fishing string to prevent sticking or for cleaning the hole. | 
| ISO number | 12694 | 
| RDS number | RDS17511940 | 
| Source | Ref.: PennWell Petroleum Dictionar; 1991 | 
| Piping |