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1、BRITISH STANDARD BS EN
14863:2005
Vitreous and porcelain enamels — Determination of the edge covering on enamelled steel plate to be used in heat exchangers
The European Standard EN 14863:2005 has the status of a
British Standard
2、
ICS 25.220.50
BS EN 14863:2005
National foreword
This British Standard is the official English language version of
EN 14863:2005.
The UK participation in its preparation was entrusted t
3、o Technical Committee
STI/36, Vitreous enamel coatings, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed;
— mon
4、itor related international and European developments and promulgate them in the UK.
A list of organizations represented on this committee can be obtained on request to its secretary.
Cross-references
The British Standards which implement international or European publications referred to in
5、this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.
This publication does not purport to include all the necessary provisions of
6、 a contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8,
7、 an inside back cover and a back cover.
The BSI copyright notice displayed in this document indicates when the document was last issued.
Amd. No.
Date
Comments
This British Standard was published under the authority of the Standards Policy and Strategy Com
8、mittee
on 17 February 2006
? BSI 17 February 2006
ISBN 0 580 46949 2
Amendments issued since publication
EUROPEAN STANDARD NORME EUROPéENNE
EUROP?ISCHE NORM
EN 14863
December 2005
ICS
English Version
Vitreous and porcelain enamels - Determination o
9、f the edge covering on enamelled steel plate to be used in heat exchangers
émaux vitrifiés - Détermination du revêtement de l'arête sur une plaque en acier émaillé destinée aux échangeurs de chaleur
Emails und Emaillierungen - Bestimmung der Kantenabdeckung von emaillierten Stahlblechen für
10、 W?rmeaustauscher
This European Standard was approved by CEN on 4 November 2005.
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 l
11、ists 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
12、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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icelan
13、d, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I Té EUR O P éEN DE NOR M A L I S A
14、 TI ON EUR O P ? I S C H ES KOM I TEE F ü R NOR M UNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
? 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. EN 14863:2005: E
Conten
15、ts Page
Foreword ..........................................................................................................................................................3
1 Scope ..............................................................................................................
16、.....................................4
2 Normative references .........................................................................................................................4
3 Principle..................................................................................................
17、.............................................4
4 Reagents and materials ......................................................................................................................4
5 Apparatus ..........................................................................................
18、..................................................4
6 Test specimens ...................................................................................................................................7
7 Procedure ................................................................................
19、............................................................7
8 Calculation and expression of results...............................................................................................7
9 Accuracy......................................................................................
20、........................................................8
10 Test report ...........................................................................................................................................8
Foreword
This European Standard (EN 14863:2005) has been prep
21、ared by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings”, the secretariat of which is held by BSI.
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 June 2006, and conflicti
22、ng national standards shall be withdrawn at the latest by June 2006.
WARNING – The use of this European Standard may involve hazardous materials, operations and equipment. This European Standard does not purport to address all of the safety problems associated with its use. It is the responsibil
23、ity of the user of this European Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to
24、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and
25、United Kingdom.
1 Scope
This European Standard specifies a test method for the determination of the covering of the edge of enamelled steel plate to be used in heat exchangers. This method is applicable to all enamelling processes.
It is applicable to plates with a thi
26、ckness between 0,5 mm and 1,5 mm.
This method is not applicable where the current flow generated in the test exceeds 3 A.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cit
27、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3693:1987)
3 Principle
The edge of an enamelled steel plate to be tested is submerg
28、ed in a fluid electrolyte. An alternating current source and a stabilized voltage are connected to the plate. The recorded current is a measure of the covering at the edge.
4 Reagents and materials
During the analysis, unless otherwise stated, use only reagents of recognized analytical gra
29、de and distilled or de-mineralized water or water of equivalent.
2 4
4.1 Pickling fluid, consisting of sulfuric acid (H SO ) solution, (7 ± 0,5) % by mass, with an Fe2+
concentration of (2 ± 1,5) g/l, at a temperature of (60 ± 2) °C.
4.2 Test bath electrolyte, consisting of s
30、odium chloride solution, 5 % NaCl by mass, made with distilled water conforming to grade 3 of EN ISO 3696, at a temperature of (22 ± 3) °C.
5 Apparatus
5.1 Test bath, consisting of a polypropylene container holding electrolyte solution in which the electrodes and a test plate are placed. P
31、olypropylene plates are used for centring and holding the test plate 10 mm from the bottom of the bath.
The arrangement of the bath and the dimensions of the components are shown in Figures 1, 2 and 3.
Key
1 Plate to be tested
80
2 Plates for centring and
32、 lifting the test plate from the bottom.
Figure 1 — Dimensions of the test bath
Dimensions in millimetres
Dimensions in millimetres
94
1
Key 2
1 Electrodes
(1264 mm long)
2 NaCl solution 24
Figure 2 — Dim
33、ensions of the two stainless steel electrodes (EN 10088-1 grade 01)
80
Dimensions in millimetres
10
10
94
Figure 3 — Dimensions of the two polypropylene centring plates
5.2 Voltage source, consisting of a stabilized alternating sou
34、rce of (10,0± 0,05) V. The electrical diagram is shown in Figure 4.
NOTE This voltage source should be able to maintain these voltage limits throughout the test.
L1
A
V
0
Figure 4 — Electrical diagram
5.3 Ammeter, capable of reading to the nearest 0,01 A.
35、
6 Test specimens
Select at least one pair of plates, one corrugated and one undulated, of the same length. The minimum length of the edge to be used for the test is 300 mm.
Immerse the plates in the pickling solution (4.1) in a suitable container for a period of 10 min ± 10 s. Rin
36、se the plates well with water and dry them.
7 Procedure
Using the design drawing, determine to the nearest 1 mm the total or stretched edge length of the corrugated or undulated test specimen.
NOTE The stretched edge length is the length taking into account the profiling of the corrugati
37、on and undulation of the test specimen.
Determine the un-enamelled thickness of the test specimen to the nearest 0,1 mm.
Position a plate in the bath (5.1) in such a way that a maximum of 10 mm of the edge to be measured (one of the edges in the flue gas direction) is immersed in the electroly
38、te solution (4.2). Do this within one hour after rinsing off the sulfuric acid.
Connect the voltage source (5.2) between the bath electrodes and electrode L1 to the test specimen and, using the ammeter (5.3), record the current automatically (3 ± 0,5) s after switching on the test voltage.
R
39、epeat the test for the other edge of the test specimen and for the second test specimen.
8 Calculation and expression of results
For each edge, calculate the uncoated surface area, a in mm2, using the equation:
a = 1,222·I2 + 12,903·I (1)
where
I is the measured current in A.
40、Calculate the percentage free surface area S using the equation:
S = a
b ′ c
100
(2)
where
a is the uncoated surface area in mm2, calculated from Equation (1);
b is the stretched edge length plate in mm;
c is the thickness of the un-enamelled plate in mm. Calculate the
41、percentage edge covering, E, using the equation:
E = 100 - S
(3)
Express the percentage edge covering as the mean of all determinations, rounded to the nearest 0,1 %, reporting the results of all determinations.
Calculate the uncoated surface area U, in mm2/m, using the equatio
42、n:
U = a 1000
b
(4)
Express the uncoated surface area per metre length, as the mean of all determinations, rounded to the nearest 10 mm2/m.
9 Accuracy
The accuracy of this measurement is ± 0,3 % of the calculated percentage edge covering and ± 2 mm2/m of the uncoated surf
43、ace area.
10 Test report
The test report shall include the following information:
a) all information necessary for identification of the sample tested;
b) reference to this European Standard, i.e. EN 14863:2005;
c) results of the test calculated as described in Clause 8, expressed
44、as:
? mean percentage edge covering, rounded to the nearest 0,1 %;
? mean uncoated surface area per metre length, rounded to the nearest 10 mm2/m;
including the results of the individual determinations the thickness of the un-enamelled plate. d) any deviations from the procedure specifi
45、ed;
e) any unusual features (anomalies) observed during the test;
f) date of the test.
blank
BS EN
14863:2005
46、
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bs英國(guó)標(biāo)準(zhǔn)】bs en 14863 vitreous and porcelain enamels determination of the edge covering on
