3.—(1) Subject to paragraph (2) of this regulation, and regulation 6 below, these Regulations apply only to vessels manufactured in series.
(2) These Regulations do not apply to–
(a)vessels designed specifically for nuclear use, where vessel failure might or would result in an emission of radioactivity;
(b)vessels intended specifically for installation in, or for use as part of the propulsive system of, a ship or aircraft; or
(c)fire-extinguishers,
and in this paragraph, “ship” has the meaning given by section 742 of the Merchant Shipping Act 1894(1).