Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17918238_1 (maximum_diameter VARCHAR, owner_operator VARCHAR)

### Question ###
What is Esperance pipeline co total diameter?

### Accurate SQL ###

SELECT maximum_diameter FROM table_17918238_1 WHERE owner_operator = "Esperance Pipeline Co"