Bsi bs en 12300 1999 (2006)

www bzfxw com BRITISH STANDARD BS EN 12300 1999 Incorporating Amendment No 1 Cryogenic vessels — Cleanliness for cryogenic service The European Standard EN 12300 1998, with the incorporation of Amendm[.]

BRITISH STANDARD BS EN

12300:1999

Incorporating Amendment No 1

Cryogenic vessels —

Cleanliness for

cryogenic service

The European Standard EN 12300:1998, with the incorporation of

Amendment A1:2006, has the status of a British Standard

ICS 27.200

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BS EN 12300:1999

This British Standard, having

been prepared under the

direction of the Engineering

Sector Committee, was published

under the authority of the

Standards Committee and comes

into effect on 15 February 1999

© BSI 2006

ISBN 0 580 30386 1

National foreword

This British Standard is the English language version of EN 12300:1998, including amendment A1:2006

The start and finish of text introduced or altered by amendment is indicated in the text by tags !" Tags indicating changes to CEN text carry the number

of the CEN amendment For example, text altered by CEN amendment 1:2006

is indicated by !"

The UK participation in its preparation was entrusted to Technical Committee PVE/18, Cryogenic vessels, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary

Cross-references

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Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover

The BSI copyright notice displayed in this document indicates when the document was last issued

Amendments issued since publication

16379 31 July 2006 See national foreword

European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈr Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

EUROPA È ISCHE NORM

November 1998

ICS 27.200

Descriptors: pressure vessels, cryogeny, area, cleanliness checks, cleaning, protection, specifications, marking

English version

Cryogenic vessels Ð Cleanliness for cryogenic service

ReÂcipients cryogeÂniques Ð Proprete Kryo-BehaÈlter Ð Reinheit fuÈr den tiefkalten Betrieb

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member

This European Standard exists in three official versions (English, French, German)

A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

+ A1

May 2006

This European Standard was approved by CEN on 1 September 1998

Ref: No EN 12300:1998 E

Page 2

EN 12300:1998

 BSI 02-1999

Foreword

This European Standard has been prepared by

Technical Committee CEN/TC 268, Cryogenic vessels,

the Secretariat of which is held by AFNOR

This European Standard shall be given the status of a

national standard, either by publication of an identical

text or by endorsement, at the latest by May 1999, and

conflicting national standards shall be withdrawn at

the latest by May 1999

According to the CEN/CENELEC Internal Regulations,

the national standards organizations of the following

countries are bound to implement this European

Standard: Austria, Belgium, Czech Republic, Denmark,

Finland, France, Germany, Greece, Iceland, Ireland,

Italy, Luxembourg, Netherlands, Norway, Portugal,

Spain, Sweden, Switzerland and the United Kingdom

Contents

Page

2 Normative references 3

5 Cleaning procedure 3

6 Cleanliness evaluation 3

7 Post cleaning protection 3

Annex A (informative) Inspection methods 5

Foreword to amendment A1

This document (EN 12300:1998/A1:2006) has been

prepared by Technical Committee CEN/TC 268

“Cryogenic vessels”, the secretariat of which is held by

AFNOR

This Amendment to the European Standard

EN 12300:1998 shall be given the status of a national

standard, either by publication of an identical text or

by endorsement, at the latest by November 2006, and

conflicting national standards shall be withdrawn at

the latest by November 2006

This document has been prepared under a mandate

given to CEN by the European Commission and the

European Free Trade Association, and supports

essential requirements of EU Directive(s)

According to the CEN/CENELEC Internal Regulations,

the national standards organizations of the following

countries are bound to implement this European

Standard: Austria, Belgium, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom

This document has been prepared under a mandate

given to CEN by the European Commission and the

European Free Trade Association

Page 3

EN 12300:1998

 BSI 02-1999

1 Scope

This standard specifies the minimum requirements for

the cleanliness of all surfaces of cryogenic vessels and

associated accessories that are in contact with the

cryogenic fluid at any expected operating conditions

This standard defines the acceptable level of surface

and particle contamination to minimize the risk of

malfunction of equipment and ensure safety against

ignition when in contact with oxygen or oxidizing

fluids (see EN 720-2)

2 Normative references

EN 720-2, Transportable gas cylinders Ð Gases and

gas mixtures Ð Part 2: Determination of

flammability and oxidizing ability of gases and gas

mixtures.

prEN 1251-1:1995, Cryogenic vessels Ð Transportable

vacuum insulated vessels of not more than 1000 litres

volume Ð Part 1: Fundamental requirements.

EN 1797-1, Cryogenic vessels Ð Gas/material

compatibility Ð Part 1: Oxygen compatibility.

3 Definitions

For the purpose of this European Standard, the

following definitions apply

3.1

cryogenic fluid

see prEN 1251-1:1995

3.2

oxidizing fluid

cryogenic fluid with oxidizing properties in accordance

with EN 720-2

4 Requirements

4.1 General requirements

Chips, foreign matter, major potentially loose particles

such as oxide scale and weld spatter, are not

acceptable

Particles visible under daylight or white light without

magnification are not acceptable More stringent

requirements for particle size may be required

depending upon the design of the system to avoid

malfunction of equipment

Free water shall not be detectable by visual

examination

4.2 Additional requirements for oxygen and oxidizing fluids

For oxygen and other oxidizing fluids, hydrocarbon contamination, paint, adhesives, sealants and protective coating shall not be detectable by visual examination using white light unless they are oxygen compatible in accordance with EN 1797-1

The maximum acceptable hydrocarbon contamination (oil, grease, etc.) is 500 mg/m2

5 Cleaning procedure

Any cleaning procedure may be used, providing the

requirements of 4.1 and 4.2, if relevant, are met If

solvent or cleaning agents are used, they shall be compatible with all materials to be cleaned in particular plastics Special care shall be taken to remove any non oxygen compatible agents (see EN 1797-1) from equipment cleaned for oxygen or oxidizing fluid service

6 Cleanliness evaluation

An inspection and sampling method shall be selected

to ensure that the requirements of 4.1 and 4.2, if

relevant, are met It shall take into account the cleaning procedure to be used, the equipment to be cleaned and its level of contamination Cleanliness evaluation methods may include those listed in annex A

The method of inspection shall not itself result in

contamination levels greater than those specified in 4.1 and 4.2.

The cleanliness evaluation method shall be documented and the results obtained shall be recorded

7 Post cleaning protection

After cleaning, items shall be protected to maintain their clean condition until used To reduce the risk of condensing any atmospheric moisture during storage, consideration shall be given to purging and sealing the equipment

Any packaging, plugs, etc that can contact the clean surfaces shall be clean and removable without leaving any residue Any packaging material shall be strong enough to resist the expected handling and storage conditions and be able to be sealed and water proof

Any protective gas used shall be dry and oil and dust free

Any pressurizing gas shall be kept at low pressure compatible with the strength of the packaging and should not exceed 0,5 bar For pressure above 0,5 bar the package may fall under transportable pressure vessels regulation

The following referenced documents are indispensable for the application of this document For

dated references, only the edition cited applies For

undated references, the latest edition of the referenced

document (including any amendments) applies

!

"

Page 4

EN 12300:1998

 BSI 02-1999

8 Marking

Evidence of conformity with the requirements of this

standard shall be documented by either:

Ð a certificate accompanying the equipment/item; or

Ð a label fixed to the protective packaging or

equipment/item

The certificate or label shall indicate:

Ð ªEN 12300 Ð O2º when cleaned for oxygen or

other oxidizing fluids;

Ð ªEN 12300º when cleaned for other cryogenic

fluids only

If a protective gas is used, the type of gas and its

pressure shall be legibly marked

Page 5

EN 12300:1998

 BSI 02-1999

Annex A (informative)

Inspection methods

A.1 General

Various methods exist for determining the cleanliness

acceptance of equipment and it is necessary that the

method selected complements the cleaning method

used This annex covers the most practical and

effective methods available It is necessary that

competent persons with the necessary training and

relevant industrial experience are used for this activity

All parts being checked by solvent flushing or

immersion should be able to drain freely to empty the

solvent If an area is identified which cannot freely

drain, a method should be developed to remove

completely the solvent without leaving contamination

For parts that are inaccessible for inspection after

assembly, it may be necessary to disassemble or

inspect parts prior to assembly Consideration should

be given to any contamination which may occur during

the assembly of inspected components

If an inspection reveals the presence of any

contaminants, the item should be partially or totally

recleaned Persistent rejection requires a re-evaluation

of the cleaning methods and quality control provisions

before re-acceptance

A.2 Direct visual examination with daylight or

white light

This is the most common inspection method used to

detect the presence of contaminants on equipment

with easily accessible surfaces This method will

without magnification detect very small particulate

matter and moisture, oils, grease, etc in relatively small

amounts

The effectiveness of this method is dependent on the

roughness of the inspected surface The method can be

used for sandblasted or mechanically cleaned steel

surfaces

Magnifying glasses are not necessary, but it is

important to have a sufficient bright level of daylight

or artificial white light

Visual examination of the surfaces is appropriate for

detecting:

Ð moisture (free water);

Ð cleaning agents;

Ð flux residues from brazing, soldering or welding;

Ð rust and loose scale, weld spatters, particles, fibres or other foreign matter;

Ð organic material such as oils, grease, paint, etc

This direct visual examination method enables

detection of a hydrocarbon contamination level

of 500 mg/m2

A.3 Direct visual examination method with ultraviolet light

Ultraviolet light causes many common, but not all, hydrocarbon or organic oils to fluoresce An ultraviolet light with a wavelength of about 370 nm used in dark

or near darkness at a distance of about 10 cm to 20 cm from the surface or piece being examined can show fluorescent areas for further inspection by other means such as wipe test, etc Fluorescent traces due to material residues known to be harmless are acceptable

When considering a piece of equipment cleaned for use

in oxygen service, it is important not to rely alone on the result of this test as, for example, some vegetable oils do not fluoresce under ultraviolet light Therefore although this test can be useful, it is certainly not the most important inspection method and should be supported by white light and/or wipe tests

NOTE Excessive exposure to direct or reflected ultraviolet light can cause eye and skin damage and therefore care should be taken when it is being used and the lamp manufacturer's instructions should be complied with.

A.4 Wipe test method

This test is useful when white light examination has been inconclusive

The surface is rubbed lightly with a clean lintfree cotton or linen cloth or with a white filter paper

This cloth or paper is examined under white light and/or ultraviolet light to find any contaminating traces

A light oxide discoloration is in some cases acceptable Since it is not acceptable to leave paper or cloth particles on the equipment, this method is not recommended for rough or cast materials

A.5 Water break test

This test may be used to detect oily residues not found

by other means The surface is wetted with a spray of clean water This should form a thin layer and remain unbroken for at least 5 s Beading of the water droplets indicates the presence of oil contaminants

A.6 Solvent contamination test method

This inspection method is used to check the result of highly specialized methods of solvent cleaning when inaccessible surfaces or bigger installations have to be cleaned For most small components it is easier and more economical to disassemble for inspection or to inspect before assembly It should be taken into account that this method of cleaning and inspection is limited by the ability to reach and dissolve the

contaminants if present Local contamination in pockets of complex equipment may be detected using this method of inspection by getting successive slight but constant indications of contamination

Considerable experience is necessary to assess the results of this method

Page 6

EN 12300:1998

 BSI 02-1999

The method of inspection is based on the comparison

of used and unused solvent The level of, or freedom

from contamination present during solvent cleaning

can be closely followed by taking successive solvent

samples during the entire cleaning process until

inspection confirms that the acceptance standard is

reached Checking the amount of contaminants in a

used sample is a good indication of the cleanliness

level reached

The amount of contaminants in a sample can be

determined in three ways:

Ð weight of residue (laboratory test);

Ð volume of residue (laboratory test);

Ð light transmission

A.6.1 Weight of residue

A known quantity (MS) of a representative sample of

unfiltered used solvent is contained in a small weighed

beaker and is evaporated to dryness, being careful not

to overheat the residue and the weight (m2) of the

residue established In the same manner, the weight

(m1) of residue from a similar quantity of clean unused

solvent is determined The difference in weight

between the two residues and the quantity of

representative sample used is related to the total

quantity (MV) of solvent used and is used to compute

the amount of residual contaminant removed per

square metre (mc) of surface area A cleaned.

mc=(m22 m1) MV/MS

A

where

m1 is the weight of residue (clean solvent);

m2 is the weight of residue (used solvent);

MS is the weight of representative sample (used solvent);

MV is the total weight of solvent used;

A is the surface area of component cleaned;

mc is the weight of contamination present per area cleaned

A.6.2 Volume of residue

A measured quantity of a sample of the unfiltered used solvent can be placed in a clear glass containment and evaporated to dryness The volume of residue can be measured directly and used to compute the volume of contaminant extracted per square metre of surface area cleaned Greater sensitivity can be achieved by successive evaporation of quantities of the same extracted solvent batch in the same glass containment

A.6.3 Light transmission

A sample of the unfiltered used solvent is compared to

a reference sample of unused solvent by comparing light transmission through the two samples

simultaneously The difference in colour or light absorption and in particle content of the solvents are a qualitative indication of the amount of contaminants dissolved The quantity of any contaminants in a sample can be estimated by analysis techniques, e.g making use of ultraviolet or infra-red light

 BSI 02-1999

Page 7

EN 12300:1998

Annex deleted

BS EN

12300:1999

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