CREATE TABLE table_22001 ("Name  ( year commissioned ) " TEXT, "Owner/operator" TEXT, "Length" TEXT, "Maximum diameter" TEXT, "From/to" TEXT, "Licence number" TEXT)

What is Esperance pipeline co total diameter?
SELECT "Maximum diameter" FROM table_22001 WHERE "Owner/operator" = 'Esperance Pipeline Co'
SELECT "Maximum diameter" FROM "table_22001" WHERE "Owner/operator" = 'Esperance Pipeline Co'