Caution: The use of boiling chromic acid solution in an apparatus under reduced pressure is a hazardous operation and requires appropriate precautions.

Caution: The use of boiling chromic acid solution in an apparatus under reduced pressure is a hazardous operation and requires appropriate precautions.

The hydraulic pressure bursting test must be carried put in thwo successive stages, using a test-rig which allows pressure in the cylinder to be increased at an even rate until the cylinder bursts and the curve of pressure variation against time to be recorded.

Whereas national regulations on pressure vessels cover many categories of pressure vessels of widely varying uses, capacities and pressures ; whereas this Directive should lay down the general provisions dealing, in particular, with EEC pattern approval and verification procedures ; whereas separate Directives for each category of vessel will lay down the technical requirements as to the design and methods of inspection of such vessels and, where appropriate, the conditions under which Community technical requirements are to replace ...[+++] the previous national provisions;

The application shall be accompanied by a file containing drawings and calculations relating to the vessel or pattern, specifications of the materials, information on the manufacturing processes involved, and details of the verification methods during manufacture, together with any other information which the manufacturer or his representative consider may help the recipient administration's decision as to whether a pressure vessel, or vessels of the same pattern, conforming to the plans, satisfies the statutory requirements for pressure vessels in the recipient country.

2.3.2. If it is apparent from a substantive examination of the file that the vessel, or the vessels of a single type, have been produced or are intended to be produced in accordance with the relevant documents, but do not satisfy the statutory requirements for pressure vessels in the recipient country and may not be granted a derogation from these requirements, the recipient administration shall notify the applicant accordingly within the period laid down in 2.2.1, and shall indicate which provisions have not been complied with and wh ...[+++]ich provisions must be complied with if the vessel, or the vessels of a single type are to be accepted.