Like the other Laird-built 30-knotters, Seal was propelled by two triple expansion steam engines, fed by four Normand boilers, rated at , and was fitted with four funnels.
Similar to the other Laird-built vessels that reached a speed of 30 knots, Seal utilized two triple expansion steam engines, supplied by four Normand boilers, had a capacity rating of , and was fitted with four smokestacks.