30. Every person is guilty of an offence who(1) hinders, in the exercise of his functions, an inspector or a person to whom the Minister has delegated powers provided for by this Act;
(2) makes a false declaration to obtain a certificate provided for by this Act;
(3) manufactures a pressure vessel without having his plans and specifications approved;
(4) instals a pressure vessel without having its installation approved;
(5) puts into operation or again puts into operation, uses, again deals with commercially or re-uses a pressure vessel without holding the certificate provided for by this Act;
(6) does welding without holding the certificate of qualification contemplated by this Act;
(7) does welding or has welding done without having had his welding procedure approved and registered, or without respecting the approved welding procedure.