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.
Seal, like other Laird-built vessels that achieved a maximum speed of 30 knots, was propelled by two triple expansion steam engines, fueled by four Normand boilers, had a capacity rating of , and was fitted with four smokestacks.