Government Decree No 175 / 1997 Coll.
Government Regulation laying down technical requirements for simple pressure vessels
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Regulation
Effective from 01.09.1997
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175
GOVERNMENT REGULATION
of 25 June 1997
laying down technical requirements for simple pressure vessels
The Government orders pursuant to Section 22 of Act No. 22 / 1997 Coll., on Technical Requirements for Products and on the Amendment and Addition of Certain Acts (hereinafter referred to as "the Act") to implement Sections 12 (1) and (4) and 13 (2) and (4) of the Act:
(1) This Regulation lays down technical requirements for simple pressure vessels, in accordance with the law of the European Communities (1) and the international Treaty (2).
(2) For the purposes of this Regulation, a single pressure vessel (hereinafter referred to as the "container ') shall be considered to be any welded vessel exposed to internal pressure of more than 0,5 bar intended for the collection of air or nitrogen which is not exposed to flame and whose parts and joints having a strength effect are made either from non-alloy stainless steel, from non-alloy aluminium or from unhardened aluminium alloys. It is either made of a cylindrical part of a circular cross-section closed on the outside by arched or flat days coupled with a cylindrical part or of two arched arched days. Its maximum working pressure is not more than 30 bar and the product of this pressure and volume of the container (" PS.V') is not more than 10 000 bar.L and the lowest working temperature is not less than 50 ° C and the maximum working temperature is not more than 300 ° C for steel containers and for aluminium or aluminium alloy containers is not more than 100 ° C.
(3) This Regulation shall not apply to:
(a) containers specially designed for nuclear purposes, the failure of which may cause the leakage of radioactivity;
(b) containers specially designed to be placed on and operated by vessels and aircraft;
(c) fire extinguishers.
(1) The specified products pursuant to Section 12 (1) of the Act are mass-produced containers.
(2) The technical requirements for vessels the product of which exceeds 50 bar.L are set out in Annex 1 (hereinafter referred to as "essential requirements"). Containers whose product is PS. V is 50 bar.L or less, must be produced in accordance with the state of scientific and technical knowledge known at the time of placing the products on the market and must be marked as specified in point 1 of Annex No 2, except for CE3 marking) according to § 9a.
(3) Where the essential requirements for vessels are specified by harmonised Czech technical standards (§ 4a of the Act) or by foreign technical standards transposing a harmonised European standard in the EU States and complying with them, the essential requirements shall be deemed to be met.
(1) The manufacturer or importer shall ensure conformity assessment (Section 12 (4) of the Act) prior to the production of containers for which the product of the PS.V is more than 50 bar.L and in the course of the production process the procedures referred to in paragraphs 2 and 3.
(2) Prior to production or import
(a) containers designed in accordance with the technical standards referred to in Article 2 (3) by the manufacturer or importer
1. ensure EC type-examination of the vessel type in accordance with § 4; or
2. arrange for the authorised person (Article 11 (1) of the Act) to check the structural and manufacturing documents referred to in point 3 of Annex 2. The authorised person shall draw up a certificate of adequacy of the documentation. With this certificate of adequacy, the documentation confirms that the design and production documents are eligible for the container manufactured according to them to comply with the essential requirements,
(b) containers which have not been fully designed in accordance with the technical standards referred to in Article 2 (3) or such standards do not specify all the essential requirements applicable to the containers shall be provided by the manufacturer or importer of the EC type-examination of the container pursuant to Article 4.
(3) In addition, during the production process, the container shall be the product of PS. V
(a) more than 3000 bar.L, subject to EC verification by an authorised person pursuant to Article 5;
(b) more than 50 bar.L and not more than 3000 bar.L, subject, at the choice of the manufacturer or importer, to EC verification by an authorized person pursuant to § 5 or to the conformity verification by the manufacturer pursuant to § 6.
(4) Documents and correspondence relating to conformity assessment procedures must be drawn up in the Czech language or in a language agreed between the manufacturer or importer and the authorised person.
(1) EC examination of the type of container is a procedure whereby the authorised person ascertains and confirms that the sample (prototype) of the container complies with the essential requirements.
(2) For EC type examination of the container, the manufacturer or importer shall provide the authorised person:
(a) identification details of the manufacturer or importer (name and surname, address, place of business and identification number of the natural person or business name, registered office and identification number of the legal person and place of manufacture of the containers);
(b) a written declaration that the EC vessel type-examination contract has not been negotiated with another authorised person;
(c) the design and production documents referred to in point 3 of Annex 2;
(d) the container which is a sample of the production under consideration.
(3) The authorised person checks not only the design and production documents for verification of conformity but also the container submitted for EC examination of the type of vessel. When checking the vessel, the authorised person shall:
(a) verify that the container has been manufactured in accordance with the design and production documents and can be safely used under the working conditions under consideration;
(b) carry out examinations and tests to verify that the container complies with the essential requirements applicable to it.
(4) If the sample (prototype) of the container complies with the essential requirements, the authorised person shall issue an EC type-examination certificate. The EC-type examination certificate, which shall contain the conclusions of the findings and tests, the conditions of validity and the descriptions and drawings necessary for the identification of the certified type, shall be transmitted by the authorised person to the manufacturer or importer.
(5) An authorised person who refuses to issue an EC type-examination certificate shall inform the Technical Standardisation, Metrology and State Testing Office (hereinafter referred to as the Office) and other authorised persons thereof. The authorised person who has revoked the EC type-examination certificate shall inform the Office thereof.
(1) EC verification is a procedure whereby the manufacturer or importer ensures and declares that the vessels which have been tested in accordance with paragraph 3 are in conformity with the type described in the certificate referred to in § 4 (4) or with the design and production documents referred to in point 3 of Annex 2 to this Regulation for which a document has been issued under § 3 (2) (a) (2).
(2) The manufacturer shall take all necessary measures to ensure conformity of the containers with the type described in the certificate referred to in § 4 (4) or in the design and production documentation referred to in point 3 of Annex 2 to this Regulation in the manufacture.
(3) The authorised person shall carry out conformity assessment findings and tests. To that end,
(a) the manufacturer submits to the authorised person the container in the form of individual homogeneous production doses produced at a certain time interval under the same conditions, the measures in the production process ensuring the homogeneity of the containers in each production dose;
(b) these doses shall be accompanied by the certificate referred to in Article 4 (4); if the containers are not manufactured in accordance with the type to be certified, the design and production documents referred to in point 3 of Annex No 2 shall be attached thereto, which shall be checked by the authorised person prior to the EC verification to certify that they are fit to comply with the essential requirements for the product manufactured accordingly;
(c) in examining the production levy, the authorised person shall ascertain whether the vessels have been manufactured and checked according to the construction and production documents; Further perform a hydraulic or pneumatic test on each container at a dose of Ph equal to 1,5 times the calculation pressure to verify its leakage; the use of the pneumatic test is subject to the approval of the safety procedures by the national safety authorities under a specific legislation; (5) for checking the quality of welds, tests shall be carried out on samples taken at the choice of the manufacturer from a representative test sample from production or from the container; tests shall be carried out on longitudinal welds, and if the welding methods used for longitudinal and circumferential welds differ, the tests shall also be carried out on circumferential welds; for containers covered by point 2.1.2 of Annex 1 to this Regulation, these tests on samples shall be replaced by a hydraulic test on five containers selected randomly from each batch to determine whether they comply with the requirements of point 2.1.2 of Annex 1 to this Regulation,
(d) if the dose complies with the requirements of (c), the authorised person shall ensure that the CE.3 marking is placed on the containers) The authorised person shall place or have his CE marking number affixed to each individual container of the batch and issue a certificate of conformity concerning the tests carried out, which he shall transmit to the manufacturer; the manufacturer may, with the agreement of the authorised person, mark each container of the batch already during the manufacturing process and all containers of the batch other than those which have failed the hydraulic or pneumatic test may be placed on the market; the manufacturer or importer must be able to submit on request certificates of conformity issued by an authorised person;
(e) if the dose is rejected, the authorised person shall inform the manufacturer accordingly in order to prevent the placing on the market of the dose; in case of frequent detection of non-compliant doses, the authorised person may refuse further statistical verification of the doses.
(1) EC declaration of conformity is a procedure whereby a manufacturer, meeting the requirements of paragraph 2, ensures conformity of the containers with the design and production documents referred to in point 3 of Annex 2 to this Regulation on which a document has been issued pursuant to Paragraph 3 (2) (a) (2) or ensures conformity of the containers with the approved type.
(2) Before the start of production, the manufacturer shall submit to the authorised person who has issued the certificate referred to in Article 4 (4) or the document referred to in Article 3 (2) (a) (2), supporting documents containing a description of the production processes and any pre-determined system measures to ensure compliance of pressure vessels with the technical standards referred to in Article 2 (3) or with the approved type. These documents shall include:
(a) a description of the manufacturing and testing equipment used in the manufacture of containers;
(b) a test report describing the checks and tests carried out during manufacture, together with the relevant procedures and the frequency of their implementation;
(c) an undertaking to carry out checks and tests in accordance with the test protocol and to carry out a hydraulic or pneumatic pressure test on each container manufactured by a test pressure equal to 1,5 times the calculation pressure; checks and tests must be carried out under the authority of qualified personnel who are sufficiently independent from the workers of production and a report on the checks and tests must be drawn up,
(d) the addresses of the manufacturing and storage sites and the date of the start of production.
(3) If the containers are not manufactured in accordance with the approved type, the authorised person who has issued the certificate referred to in Article 4 (4) or the document referred to in Article 3 (2) (a) (2) shall examine the supporting documents referred to in paragraph 2 and the design and production documents referred to in point 3 of Annex No 2, whether they are fit for the container manufactured according to them to comply with the essential requirements and shall report to the manufacturer on the result of the examination.
(4) If the vessel is the product of PS. In more than 200 bar.L, their production is subject to supervision by an authorised person pursuant to § 7.
(1) For vessels complying with Article 6 (4), the authorised person who issued the certificate referred to in Article 4 (4) or, where applicable, the authorised person who issued the document referred to in Article 3 (2) (a) (2) shall supervise the production process. The purpose of the supervision referred to in paragraph 2 shall be to ensure that the manufacturer properly fulfils the obligations referred to in paragraph 3.
(2) Authorised person in the case referred to in Article 6 (4)
(a) determine whether the manufacturer checks the mass-produced vessels in accordance with Article 6 (2) (c);
(b) take random samples of containers for control purposes at the place of manufacture or at the place of storage of the containers.
(3) In the case referred to in Article 6 (4), the manufacturer shall allow the authorised person, for supervisory purposes, access to the manufacturing and storage sites of the containers, allow him to select samples of the containers and provide all necessary information, in particular:
(a) design and production documents;
(b) control procedures;
(c) the certificate referred to in Article 4 (4) or the document referred to in Article 3 (2) (a) (2),
(d) a report of the manufacturer's inspections and tests.
(4) The authorised person shall send a copy of the surveillance report referred to in paragraph 2 to the Authority and to other authorised persons upon request.
(6) The conditions for authorising activities in conformity assessment of vessels (Section 11 of the Act) are set out in Annex 3 to this Regulation.
The evidence of the conformity assessment method used (Section 13 (8) of the Act) shall include the instructions for use, the design and production documents referred to in points 2 and 3 of Annex 2 to this Regulation and the documents and findings issued when assessing conformity by an authorised person. In cases resulting from Paragraph 13 (8) of the Act, the importer shall submit to the supervisory authority documentation in the language of one of the Member States of the European Union or in a language agreed with the supervisory authority.
(1) For containers meeting the requirements of § 5 or § 6, the manufacturer shall, instead of issuing a declaration of conformity, place on each product a CE marking certifying that the containers comply with the technical standards referred to in § 2 (3) or with the approved type.
(2) The CE marking and the inscriptions referred to in points 1 and 5 of Annex 2 to this Regulation must be placed on a container or on a production label which cannot be separated from the container and made visibly, legibly and indelibly. The CE marking shall be accompanied by an identification number assigned to the authorised person responsible for EC verification or supervision.
(3) Other permissible markings may be affixed to the container or to the production label provided that the visibility and legibility of the CE marking are not thereby reduced.
(4) Where vessels are subject to other government regulations which relate to other aspects and also provide for the location of the CE marking, the CE marking shall also indicate compliance with the provisions of those other government regulations.
(5) However, if one or more of these Regulations allow a manufacturer or importer to choose which conformity assessment procedure to apply during a transitional period, the CE marking shall only indicate compliance with those regulations of the Government which the manufacturer or importer used. In this case, the accompanying documentation, warnings or instructions for use required by the relevant government regulations and attached to the relevant containers shall include a list of the government regulations used.
(1) For containers which will be placed on the market after the entry into force of this Regulation by 30 June 1998, the manufacturer or importer may ensure conformity assessment within the meaning of Article 12 (4) (a) of the Act.
(2) Containers which will be placed on the market after the entry into force of this Regulation by 30 June 1998 may only meet the technical requirements applicable under the legislation in force before the entry into force of this Regulation.
This Regulation shall enter into force on 1 September 1997.
Prime Minister:
Prof. Ing. Klaus CSc.
Minister for Industry and Trade:
JUDr. Kühnl v. r.
Příloha č. 1
Annex No 1 to Decree-Law No 175 / 1997 Coll.
ESSENTIAL REQUIREMENTS
1. Materials
The materials shall be selected according to the intended purpose of using the containers and in accordance with points 1.1 to 1.4.
1.1. Pressure parts
The materials referred to in point 1 used for the production of pressure components shall be:
(a) suitable for welding;
(b) malleable and tenacious in such a way that the material breach at the lowest working temperature does not result in a fragmented or fragile refraction;
(c) ageing resistant.
In addition, for steel containers, the materials shall comply with the requirements set out in 1.1.1. and for aluminium or aluminium alloy containers with the requirements of 1.1.2. The materials shall be supported by a metallurgical certificate from the material manufacturer as set out in Annex 2.
1.1.1. Steel containers
The steel used shall meet the following requirements:
(a) they must not be uncalmed and must be delivered in a state of normally annealed or comparable condition;
(b) the carbon content of the product must be less than 0,25% and the sulphur and phosphorus content must be less than 0,05% for each individual element;
(c) they must have the following mechanical characteristics for each product:
(ca) maximum tensile strength Rm, max shall be less than 580 N. mm-2
(cb) the tensile strength shall be as follows:
(1) if the test samples are taken parallel to the rolling direction:
by thickness ≥ 3 mm: A ≥ 22%,
for thickness < 3 mm: A80 mm ≥ 17%,
(2) if the test samples are taken perpendicular to the direction of rolling:
for thickness ≥ 3 mm: A ≥ 20%,
for thickness < 3 mm: A80 mm ≥ 15%,
(cc) the mean value of KCV in three samples at the lowest working temperature shall not be less than 35 J.cm-2 Maximum one of three values may be less than 35 J. cm-2 but not less than 25 J.cm-2
In the case of steels used for the manufacture of containers whose lowest working temperature is less than -10 ° C and whose wall thickness is more than 5 mm, this property shall be checked.
1.1.2 Aluminium containers
Unalloyed aluminium shall have an aluminium content of at least 99,5% and an unhardened aluminium alloy shall have sufficient resistance to intercrystal corrosion at the highest working temperature.
In addition, these materials shall comply with the following requirements:
(a) they must be delivered in an annealed state; and
(b) each semi-finished product shall show the following mechanical values:
(ba) maximum value of the tensile strength limit Rm, max shall not exceed 350 N.mm-2
(bb) the traction shall have the following values:
A ≥ 16% if the test sample is taken in the direction of rolling,
A ≥ 14% if the test sample is taken perpendicular to the direction of rolling.
1.2 Additional materials for welding
Additional materials which are used for the production of welding connections of vessels or on containers shall be suitable for and compatible with welded materials.
1.3 Accessories affecting the strength of the container.
These parts (e.g. screws and nuts) shall be made from the material referred to in paragraph 1.1 or from other suitable types of steel, aluminium or aluminium alloys which are compatible with the materials used for the production of pressure components.
These materials shall have adequate elasticity and tenacity at the lowest working temperature.
1.4. Non-pressure parts
All non-pressurised parts of welded containers shall be made of materials compatible with the materials of the components to which they are to be welded.
2. Design of containers
When designing the container, the manufacturer shall be:
(a) determined according to the purpose of using the following value:
1. the lowest working temperature of Tmin,
2. maximum working temperature Tmax,
3. maximum working pressure PS.
If the selected lowest working temperature is higher than -10 ° C, the required material properties shall be guaranteed for -10 ° C,
(b) the following requirements are also taken into account:
1. it must be possible to carry out an internal surface check;
2. it shall be possible to empty the vessels;
3. the mechanical characteristics must be maintained throughout the specified life of the container when used for the purpose;
4. the containers must be adequately protected against corrosion, taking into account their prescribed use;
(c) account taken of the fact that under the intended conditions of use:
1. the containers will not be exposed to a voltage which could jeopardise their safety during use,
2. the internal pressure will not continuously exceed the maximum working pressure PS, but may be temporarily exceeded by up to 10%.
Circular and longitudinal welds shall be made of fully welded welds or welds equivalent. The gilt bottom, with the exception of semi-spherical days, shall have a cylindrical hem.
2.1. Wall thickness
If product PS. V is not greater than 3000 bar.l, the manufacturer chooses one of the methods described in paragraphs 2.1.1 and 2.1.2 for determining the thickness of the container wall; if the product is PS. In more than 3000 bar.l, or if the maximum working temperature is more than 100 ° C, this thickness shall be determined by the method described in paragraph 2.1.1.
However, the actual wall thickness of the cylindrical part and the day of steel containers shall not be less than 2 mm and shall not be less than 3 mm for aluminium and aluminium alloy containers.
2.1.1. Calculation method
The minimum thickness of the pressure components shall be calculated taking into account the size of the following loads and conditions:
(a) the calculated calculation pressure shall not be less than the highest working pressure chosen;
(b) the total permissible membrane voltage may not exceed the lower of 0,6 RT and 0,3 Rm. For the determination of the permissible voltage, the smallest of the RET and Rm values, min guaranteed by the material manufacturer, shall be used.
However, if the cylindrical part of the container has one or more longitudinal welds made by means other than an automatic device, the thickness calculated by the above method shall be multiplied by 1,15.
2.1.2. Experimental method
The wall thickness shall be determined in such a way that the vessels at ambient temperature are resistant to pressure equivalent to at least five times the maximum working pressure, with a permanent perimeter deformation of not more than 1 per cent.
3. Production
The containers shall be manufactured and subjected to production checks in accordance with the design and production documents referred to in point 3 of Annex 2.
3.1. Production of components
In the manufacture of components (e.g. forming or fencing), surface defects or cracks or changes in mechanical properties likely to affect the safety of containers shall not occur.
3.2. Welding on pressure parts
The characteristics of welds and adjacent areas shall be similar to those of welded materials and shall be free of surface or internal defects which could affect the safety of the vessels.
The welds shall be made by qualified welders or workers with adequate competence for the chosen welding method.
Approval and qualification tests shall be carried out by recognised independent organisations.
During production, the continuous quality of welds shall also be ensured by carrying out appropriate tests corresponding to the welding method used. A report shall be drawn up on these tests.
4. The instructions drawn up in accordance with point 2 of Annex 2 shall be supplied with the container.
Příloha č. 2
Annex No 2 to Government Decree No 175 / 1997 Coll.
1. Labels
The container or label shall contain at least the following information:
(a) maximum working pressure (PS in bars),
(b) maximum working temperature (Tmax in ° C);
(c) the lowest working temperature (Tmin in ° C);
(d) volume of container (V - to be declared in litres),
(e) the name or trade name or mark of the manufacturer;
(f) the type and production or serial number of the vessels,
(g) the last two digits of the year in which the CE marking was affixed.
In the case of the use of a data label, the label shall be designed so that it cannot be re-used and shall contain a space available to complete any additional data.
2. Instructions for use
The instructions for use shall include the following information:
(a) the particulars referred to in point 1, except for the identification of the series of vessels;
(b) the intended use of the container;
(c) operator, maintenance and installation requirements with regard to the safety of the container.
This information must be in the Czech language.
3. Construction and production materials
The design and production documents shall include a description of the methods and operational procedures in place to meet the requirements of Annex 1 or the technical standards referred to in Section 2 (3), in particular:
(a) a detailed production drawing of the type of container;
(b) descriptions and explanations of the design and production supporting documents;
(c) a document describing:
(ca) selected materials,
(cb) selected welding procedures,
(cc) the checks chosen,
(cd) any details concerning the design of the container, if any.
Where the procedures laid down in Sections 5 to 7 are applied, the supporting documents shall also include:
(c) documents relating to the suitability of welding processes and the qualification of welders or welding operators;
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Regulation Information
| Citation | Government Decree No. 175 / 1997 Coll., laying down technical requirements for simple pressure vessels |
|---|---|
| Regulation Type | Regulation |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 08.08.1997 |
|---|---|
| Effective from | 01.09.1997 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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