Though the Admiralty would have preferred Loch-class frigates, the inability of many small shipyards to construct the larger ships required them to come up with a smaller vessel.

This powered one vertical triple expansion engine that drove one shaft, giving the ships a maximum speed of 16.5 knots (30.6 km/h; 19.0 mph).

[2] The ships carried 480 tons of oil giving them a range of 6,200 nautical miles (11,500 km; 7,100 mi) at 15 knots (28 km/h; 17 mph).

[4] The Type 147B was tied to the Squid anti-submarine mortar and would automatically set the depth on the fuses of the projectiles until the moment of firing.

AS member of the group, the corvette remained a convoy escort for the rest of the war, returning to Canada in June 1945.

In August 1945, the ship underwent a refit at Charlottetown, Prince Edward Island before being placed in reserve at Halifax, Nova Scotia in October.

[8] Petrolia was sold for mercantile use on 8 March 1946 to Castle Sg Co SA and renamed Maid of Athens with a Panamanian registry.