prEN 15045
(Main)Transportable gas cylinders - Specification for the design and construction of refillable seamless aluminium or aluminium alloy gas cylinders for portable carbon dioxide fire extinguishers of water capacities from 0,5 litre up to 150 litres
Transportable gas cylinders - Specification for the design and construction of refillable seamless aluminium or aluminium alloy gas cylinders for portable carbon dioxide fire extinguishers of water capacities from 0,5 litre up to 150 litres
This standard specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes and tests at manufacture of refillable seamless aluminium or aluminium alloy gas cylinders that are fitted with bursting disc devices for portable CO2 fire extinguishers of water capacities from 0,5 l up to 15 l.
Ortsbewegliche Gasflaschen - Gestaltung und Konstruktion von wiederbefüllbaren ortsbeweglichen nahtlosen Gasflaschen aus Aluminium und Aluminiumlegierung für Tragbare Feuerlösche Kohlenstoffdioxid mit einem Fassungsraum von 0,5 Liter bis einschließlich 150 Liter
Bouteilles à gaz transportables - Spécifications pour la conception et la fabrication de bouteilles à gaz rechargeables et transportables en aluminium ou alliage d'aluminium sans soudure d'extincteurs d'incedie portatif de dioxide de carbone de capacité de l'eau comprise entre 0,5 litre et 150 litres inclus
Premične plinske jeklenke – Specifikacija za zasnovo in konstrukcijo ponovno polnljivih nevarjenih plinskih valjev iz aluminija ali aluminijeve zlitine za prenosne gasilne naprave z ogljikovim dioksidom z vodno prostornino od 0,5 litra do 150 litrov
General Information
Standards Content (Sample)
SLOVENSKI OSIST prEN 15045:2004
PREDSTANDARD
december 2004
Premične plinske jeklenke – Specifikacija za zasnovo in konstrukcijo
ponovno polnljivih nevarjenih plinskih valjev iz aluminija ali aluminijeve zlitine
za prenosne gasilne naprave z ogljikovim dioksidom z vodno prostornino od
0,5 litra do 150 litrov
Transportable gas cylinders - Specification for the design and construction of
refillable seamless aluminium or aluminium alloy gas cylinders for portable carbon
dioxide fire extinguishers of water capacities from 0,5 litre up to 150 litres
ICS 23.020.30 Referenčna številka
OSIST prEN 15045:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD
DRAFT
prEN 15045
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2004
ICS
English version
Transportable gas cylinders - Specification for the design and
construction of refillable seamless aluminium or aluminium alloy
gas cylinders for portable carbon dioxide fire extinguishers of
water capacities from 0,5 litre up to 150 litres
Bouteilles à gaz transportables - Spécifications pour la Ortsbewegliche Gasflaschen - Gestaltung und Konstruktion
conception et la fabrication de bouteilles à gaz von wiederbefüllbaren ortsbeweglichen nahtlosen
rechargeables et transportables en aluminium ou alliage Gasflaschen aus Aluminium und Aluminiumlegierung für
d'aluminium sans soudure d'extincteurs d'incedie portatif de Tragbare Feuerlösche Kohlenstoffdioxid mit einem
dioxide de carbone de capacité de l'eau comprise entre 0,5 Fassungsraum von 0,5 Liter bis einschließlich 150 Liter
litre et 150 litres inclus
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 23.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre 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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15045:2004: E
worldwide for CEN national Members.
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prEN 15045:2004 (E)
Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms, definitions and symbols.5
4 Material requirements .8
5 Design requirements .10
6 Construction and workmanship requirements.14
7 New design tests.17
8 Tests for aluminium and aluminium alloy cylinders.18
9 Tests on every cylinder.26
10 Failure to meet test requirements.26
11 Markings .27
12 Certificate .27
Annex A (normative) Corrosion tests.28
Annex B (normative) Test method to determine sustained-load-cracking resistance of aluminium
alloy cylinders.39
Annex C (normative) Description, evaluation of manufacturing defects and conditions for
rejection of seamless aluminium and aluminium alloy gas cylinders at time of visual
inspection .45
Annex D (informative) Examples of wall thickness calculation.53
Annex E (informative) Examples of new design (type) approval and production testing
certificates .55
Annex F (normative) Specific requirements for cylinders made of aluminium alloy 2001 (AA2001) .59
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC (PED) .65
Bibliography .67
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prEN 15045:2004 (E)
Foreword
This document (prEN 15045:2004) has been prepared by Technical Committee CEN/TC 23 “Transportable
gas cylinders”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
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).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This European Standard has been prepared to address the essential requirements of the PED for portable,
refillable seamless aluminium CO fire extinguishers of water capacities from 0,5 litre up to and including 15
2
litres.
Annexes A, B, C and F are normative. Annexes D, E and ZA are informative.
3
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prEN 15045:2004 (E)
Introduction
The purpose of this standard is to provide a specification for the design, manufacture, inspection and approval
of refillable seamless aluminium or aluminium alloy gas cylinders for use in portable CO fire extinguishers.
2
The specification given is based upon knowledge of, and experience with, materials, design requirements,
manufacturing processes and control during manufacture, of cylinders in common use in the countries of the
CEN members.
This standard draws upon established practice as outlined in the ADR (European Agreement Concerning the
International Carriage of Dangerous Goods by Road) for determining the test pressure of CO cylinders (ADR
2
P200 4.1.4.1)
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prEN 15045:2004 (E)
1 Scope
This standard specifies minimum requirements for the material, design, construction and workmanship,
manufacturing processes and tests at manufacture of refillable seamless aluminium or aluminium alloy gas
cylinders that are fitted with bursting disc devices for portable CO fire extinguishers of water capacities from
2
0,5 l up to 15 l.
2 Normative references
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.
EN 573-3, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 3:
Chemical composition
EN 629-1, Transportable gas cylinders — 25E taper thread for connection of valves to gas cylinders — Part 1:
Specification
EN 629-2, Transportable gas cylinders — 25E taper thread for connection of valves to gas cylinders — Part 2:
Gauge inspection
EN 10002-1, Metallic materials — Tensile testing — Part 1: Method of test at ambient temperature
EN 10003-1, Metallic materials — Brinell hardness test — Part 1: Test method
EN 10204, Metallic Products — Types of inspection documents
EN ISO 7539-6, Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of
pre-cracked specimens for tests under constant load or constant displacement (ISO 7539-6:1989)
EN ISO 13341, Transportable gas cylinders — Fitting of valves to gas cylinders
EURONORM 6-55, Bend test for steel
prEN ISO 13769: 2004, Gas cylinders — Stamp marking (ISO 13769:2002)
EN ISO 15245-1, Gas cylinders — Parallel threads for connection of valves to gas cylinders — Part 1:
Specification
EN ISO 15245-2, Gas cylinders — Parallel threads for connection of valves to gas cylinders — Part 2: Gauge
Inspection
3 Terms, definitions and symbols
For the purpose of this document, the terms, definitions and symbols given in EN ISO 7539-6:1995 and the
following apply.
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prEN 15045:2004 (E)
3.1 Terms and definitions
3.1.1
artificial ageing
heat treatment process in which the solute phase is precipitated to give an increased yield stress and tensile
strength
3.1.2
batch
quantity of up to 500 cylinders, plus cylinders for destructive testing, of the nominal diameter, thickness, length
and design made successively from the same cast and (if applicable) the same artificial ageing furnace load
3.1.3
crack mouth opening displacement (CMOD)
V
mode 1 (also called opening-mode) component of crack displacement due to elastic and plastic deformation,
measured at the location on a crack surface that has the greatest elastic displacement per unit load
3.1.4
design stress factor (variable)
F
ratio of equivalent wall stress at test pressure (P ) to guaranteed minimum yield stress (R )
h e
3.1.5
mass
weight of a cylinder, expressed in kilograms, comprising the combined weight of cylinder and permanently
attached parts (eg foot ring, neck ring) but without valve
3.1.6
quenching
controlled rapid cooling in a suitable medium to retain the solute phase in solid solution
3.1.7
solution heat treatment
thermal treatment which consists of heating the products to a suitable temperature, holding at that
temperature long enough to allow constituents to enter into solid solution and cooling rapidly enough to hold
the constituents in solution
3.1.8
stabilizing heat treatment
heat treatment applied to some 5000 series aluminium alloys in order to prevent changes in mechanical
properties and structure under service conditions
3.1.9
yield stress
value corresponding to 0,2 % proof stress (non-proportional elongation), R for aluminium alloys, or 1%
p0,2
proof stress for unalloyed aluminium in the unhardened state
3.2 Symbols
a Calculated minimum thickness, in millimetres, of the cylindrical shell
a' Guaranteed minimum thickness, in millimetres, of the cylindrical shell
A Percentage elongation, determined by the tensile test 8.2.2.2
b Guaranteed minimum thickness, in millimetres, at the centre of a convex base (see Figure 1)
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prEN 15045:2004 (E)
d Diameter of former, in millimetres (see Figure 4)
D Nominal outside diameter of the cylinder, in millimetres (see Figure 1)
E Modulus of elasticity, in megapascals (MPa)
F Design stress factor (variable) (see 3.1.4)
H Outside height of domed part (convex head or base end), in millimetres (see Figure 1)
½
K Applied elastic stress intensity, in MPa×m
IAPP
n The ratio of the diameter of the bend test former to actual thickness of test piece (t)
1)
P Measured burst pressure, in bar above atmospheric pressure
b
1)
P Lower cyclic pressure, in bar above atmospheric pressure
lc
1)
P Hydraulic test pressure, in bar above atmospheric pressure
h
P Maximum allowable pressure in bar for which the cylinder is designed, as specified in 5.2
S
r Inside knuckle radius, in millimetres (see Figure 1)
r Inside crown radius, in millimetres (see Figure 1)
i
R Minimum guaranteed value of yield stress (see 3.1.9) in megapascals, for the finished cylinder
e
R Actual value of yield stress, in megapascals, determined by the tensile test in 8.1.2
ea
R Average of measured yield stress of two specimens from the test cylinder representing the SLC test
eSLC
specimens location at room temperature, in megapascals (for location of the specimens, see B.4.3)
R Minimum guaranteed value of tensile strength, in megapascals, for the finished cylinder
g
R Actual value of tensile strength, in megapascals, determined by the tensile test in 8.1.2
m
S Original cross sectional area of tensile test piece, in square millimetres, according to EN 10002-1
o
SLC Sustained-load-cracking
T Titre
T Maximum allowable temperature, in degree Celsius (°C)
s
t Actual thickness of test specimen, in millimetres
V Crack mouth opening displacement (CMOD), in millimetres
5
1)
1bar = 10 Pa = 0.1MPa.
7
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prEN 15045:2004 (E)
4 Material requirements
4.1 General provisions
4.1.1 Cylinders for portable CO fire extinguishers may be manufactured from unalloyed aluminium of at least
2
99,5% purity.
1)
4.1.2 Aluminium alloy(s) that conform to EN 573-3 (or Aluminum Association documents) as listed in Table 1
may be used to produce portable CO fire extinguisher cylinders, provided that they satisfy the requirements
2
of the corrosion resistance tests defined in annex A, and meet all other requirements of this standard including
annex B. For specific requirements relating to Aluminium Alloy 2001, refer to annex F.
4.1.3 The cylinder manufacturer shall permanently mark the cylinders with the particular cast of the alloy from
which they are made, and shall obtain documentation prepared by the material manufacturer that affirms
conformity to the specified material. This documentation shall take the form of a certificate of specific product
control (EN 10204).
4.2 Heat treatment
4.2.1 Heat-treatable alloys
The manufacturer shall specify on the new design (type) approval documentation the solution heat treatment
and artificial ageing temperatures and the times for which the cylinders have been held at those temperatures.
The medium used for quenching after solution heat treatment shall be identified.
4.2.2 Non-heat-treatable alloys
The manufacturer shall specify on the new design (type) approval documentation the type of metal forming
operation carried out (extrusion, drawing, ironing, head forming, etc).
Unless the alloy is subjected to a temperature in excess of 400°C during the forming process, a stabilizing
heat treatment shall be carried out and the temperature and time at temperature shall be specified by the
manufacturer.
4.2.3 Control of specified heat treatment
During the heat treatment, the manufacturer shall comply with the specified temperatures and durations,
within the following tolerances.
a) Temperatures:
— solution temperature ± 10 °C;
— artificial ageing temperature ± 5 °C;
— stabilizing temperature ± 10 °C.
b) Durations:
— stabilizing treatment ± 10%.
th
2)
AA is the Aluminum Association Inc., 900 19 Street N.W.,Washington D.C., 20006-2168, USA.
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prEN 15045:2004 (E)
Table 1 — Chemical composition of aluminium alloys
a
Type of alloy Marking Chemical composition weight
code
%
reference
Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Pb Others Aluminium
Each Total
min - - - 0,50 4,5 - - - - - - - - Remainder
EN AW-5283A 5283
max 0,30 0,30 0,03 1,0 5,1 0,05 0,03 0,10 0,03 0,05 0,0030 0,05 0,15
min 0,40 - 0,15 - 0,8 0,04 - - - - - - - Remainder
EN AW-6061A 6061
max 0,8 0,7 0,40 0,15 1,2 0,35 - 0,25 0,15 - 0,0030 0,05 0,15
min - - 5,2 0,15 0,2 - - - - - - - - Remainder
EN AW-2001 2001
max 0,20 0,20 6,0 0,5 0,45 0,10 0,05 0,10 0,20 0,05 0,0030 0,05 0,15
min - - 1,8 - 1,3 0,15 - 6,1 - - - - - Remainder
EN AW-7060 7060
max 0,15 0,20 2,6 0,20 2,1 0,25 - 7,5 0,05 0,05 0,0030 0,05 0,15
min - - 1,8 - 1,7 0,15 - 5,6 - - - - - Remainder
b
AA-7032 7032
max 0,1 0,12 2,4 0,05 2,5 0,25 - 6,6 0,1 0,05 0,0030 0,05 0,15
2)
Where a melt contains scrap or other re-used material the bismuth content shall not exceed 0,0030 %.
a
Alloy designation according to EN 573-3.
th
b
AA is the Aluminum Association Inc., 900 19 Street N.W., Washington D.C., 20006-2168, USA. AA 7032 is awaiting inclusion in EN 573-3.
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prEN 15045:2004 (E)
5 Design requirements
5.1 General provisions for heat-treatable alloys
5.1.1 The calculation of the wall thickness of the pressure-containing parts shall be related to the yield stress
(R ) of the material to ensure elastic behaviour.
e
5.1.2 For calculation purposes the value of the yield stress (R ) is limited to a maximum of 0,90 R for
e g
aluminium alloys.
5.1.3 The internal pressure upon which the calculation of wall thickness is based shall be the hydraulic test
pressure (p ).
h
5.2 Calculation of cylindrical wall thickness for heat-treatable alloys
The guaranteed minimum thickness of the cylindrical shell (a') shall not be less than the thickness calculated
using the equation:
10FR − 3.p
D
e h
a = 1−
2 10FR
e
where the value of F shall not exceed 0,875.
The calculated minimum thickness shall also satisfy the equation:
D
a≥+1
100
where the value of a shall be at least 1,5 mm.
Cylinders for CO fire extinguishers shall be designed using hydraulic test pressures related to selected filling
2
ratios. The test pressure shall not be less than the developed pressure at 65°C (see Table 2).
Table 2 — Test pressure versus filling ratio
Filling ratio Maximum
Minimum test pressure P
h
allowable
kg/l
pressure P
S bar
bar
0,667 136,8 200
0,675 138,4 200
0,750 173,5 250
When choosing the minimum guaranteed value of the thickness of the cylindrical shell (a'), the manufacturer
shall take into account all requirements for type and production testing, particularly the burst test requirements
of 8.2.
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H
prEN 15045:2004 (E)
NOTE For examples of wall thickness calculations, see annex D.
5.3 Design of ends (heads and bases)
The thickness and shape of the base and head of the cylinders shall be such as to meet the requirements of
the tests laid down in 8.3 and 8.4
In order to achieve satisfactory stress distribution, the cylinder wall thickness shall increase progressively in
the transition zone between the cylindrical shell and the ends, particularly the base end. For example, typical
shapes of convex heads and base ends are shown in Figure 1. The thickness at any part of the base shall not
be less than the guaranteed minimum thickness of the cylindrical part.
The internal knuckle radius (r) shall not be less than 10 % of the internal diameter of the shell.
For convex ends, the inside crown radius (r ) shall not be greater than 1,2 times the internal diameter of the
i
shell.
a'
D
a) b)
Figure 1 — Examples of convex ends
11
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prEN 15045:2004 (E)
r
i
a'
r
D
c) d)
e) f)
r
i
a'
r
g) h)
Figure 1 — Examples of heads and convex ends (cont.)
12
b
b
H
H
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prEN 15045:2004 (E)
i) j)
k)
Figure 1 — Examples of heads and convex ends (cont.)
5.4 Neck design
5.4.1 The external diameter and thickness of the formed neck end of the cylinder shall be adequate for the
torque applied in fitting the valve to the cylinder. The torque may vary according to the diameter of thread, the
form, and the sealant used in the fitting of the valve. The torques specified in EN ISO 13341 shall not be
exceeded, since this could result in permanent damage to the cylinder. Where the cylinder manufacturer
specifies a lower torque this also shall not be exceeded. The manufacturer shall notify any such requirements
to the purchaser of aluminium or aluminium alloy cylinders for portable CO fire extinguishers.
2
5.4.2 The thickness of the wall in the cylinder neck shall be sufficient to prevent permanent expansion of the
neck during initial and subsequent fitting of the valve into the cylinder. Where the cylinder is specifically
designed to be fitted with neck reinforcement, such as a neck ring or shrunk-on collar this may be taken into
account (see EN ISO 13341).
5.4.3 Cylinders for portable CO fire extinguishers may be designed with one or two opening(s) along the
2
central cylinder axis only.
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prEN 15045:2004 (E)
5.5 Foot-rings
When a foot-ring is provided, it shall be sufficiently strong to support the cylinder in a vertical orientation and
made of material compatible with that of the cylinder. The shape should be cylindrical and shall give the
cylinder sufficient stability. The foot-ring shall be secured to the cylinder by a method other than welding,
brazing or soldering. Any gaps that may form water traps shall be sealed to prevent ingress of water, by a
method other than welding, brazing or soldering.
5.6 Neck-rings
When a neck-ring is provided, it shall be made of a material that is compatible with that of the cylinder, and
shall be securely attached by a method other than welding, brazing or soldering.
The manufacturer shall ensure that the axial load required to remove the neck ring is greater than 10 times the
weight of the empty cylinder and not less than 1 000 N, and shall also ensure that the minimum torque
required to turn the neck ring is greater than 100 N.m.
5.7 Design drawing
A design drawing that is fully annotated with all dimensions, including the specification of the material and that
makes reference to this standard, shall be prepared.
6 Construction and workmanship requirements
6.1 General
The cylinder shall be produced by:
— cold or hot extrusion from cast or extruded or rolled billet;
— cold or hot extrusion, followed by cold drawing, from cast or extruded or rolled billet;
— cupping, flow forming, spinning and cold drawing sheet or plate;
— formed from tube by spinning of the ends – specific for double ended cylinders only.
Once the manufacturing route has been established and new design approval obtained, no other significant
changes to the process shall be permitted unless the product is submitted for re-approval.
6.2 Welding
Welding of seamless aluminium and aluminium alloy gas cylinders shall not be permitted under any
circumstances.
6.3 Wall thickness
Each cylinder shall be examined for thickness and for external and internal surface defects. The wall thickness
at any point shall not be less than the minimum design thickness.
6.4 End forming
The crown end shall be homogeneously formed by an appropriate method, e.g. forging, swaging or spinning.
Prior to and/or after the closing-in operation, significant remnants of the as-cast structure of the open-end of
the shell shall be removed.
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prEN 15045:2004 (E)
Where heat has to be applied in order to form the cylinder neck/shoulder, uniform heat distribution shall be
achieved prior to the forming operation (e.g. by means of induction heating). This heat distribution shall be
achieved independently of the process employed for the manufacture of the shell.
For 6000 series alloys special precautions shall be taken to achieve a fine grain structure in the neck of the
finished cylinder.
Regardless of the method used for the closing-in operation, the tools used for the head forming process shall
facilitate metal flow and result in smooth surfaces of the cylinder, especially in the neck/shoulder areas. There
shall be no crimping effect, sudden contour changes or significant folds (see 6.7) that can act as stress raisers
during the cylinder's eventual service conditions.
6.5 Surface defects
The internal and external surfaces of the finished cylinder shall be free from defects that would adversely
affect the safe working of the cylinder. Such defects shall be removed by local dressing. The wall thickness of
any dressed area shall not be less than the minimum thickness specified.
6.6 Neck threads
The internal neck threads shall conform to a recognized standard (e.g. EN 629-1 or EN ISO 15245-1) to
permit the use of a corresponding valve, thus minimizing neck stresses following the valve torquing operation.
Internal neck threads may be checked using gauges, e.g. gauges that conform to EN 629-2 or EN ISO 15245-
2. Particular care shall be taken to ensure that neck threads are accurately cut, are of full form and free from
any sharp profiles, edge burrs or severe tap marks.
6.7 Examination for surface imperfections and neck folds
Each cylinder shall be examined for neck folds by e.g. introscope, borescope, dental mirror, tactile, ultrasonics.
Folds that are visible as a line running into the threaded portion (as shown on the left hand side of Figure 2)
shall be removed by a machining operation until the lines are no longer visible. After the machining operation,
the thickness of the machined area and the thread characteristics shall be at least that required to pass all
necessary testing. The whole internal shoulder area shall be re-inspected to verify that folding or its lines have
been removed.
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prEN 15045:2004 (E)
12
Key
1 Folds
2 Machine away
Figure 2 — Example of cylinder neck folds before and after machining
6.8 Out-of-roundness
The out-of-roundness of the cylindrical shell, i.e. the difference between the maximum and minimum outside
diameters at the same cross-section, shall not exceed 2 % of the mean of these diameters.
6.9 Straightness
The maximum deviation of the cylindrical part of the shell from a straight line shall not exceed 3 mm per metre
length.
6.10 Stability
For a cylinder designed to stand on its base incorporating foot-ring or foot protrusions, the cylinder shall stand
on a flat surface firmly and vertical. The maximum deviation of the cylindrical part of the shell from a vertical
line shall not exceed 1 % of its height.
6.11 Mean diameter
The mean external diameter shall not deviate more than ± 1 % from the nominal design diameter.
6.12 Checking of water capacity
The minimum water capacity shall be measured and recorded. Care shall be taken to prevent water remaining
in cylinders after the water capacity checks. In the event that water does remain in the cylinders after the
water capacity checks, an internal drying stage shall be introduced prior to hydraulic pressure testing.
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prEN 15045:2004 (E)
6.13 Mass measurement
The mass of each cylinder expressed in kilograms shall be marked on the cylinder, rounded down to two
decimal places. This mass shall be the combined mass of the cylinder and permanently attached parts (e.g.
foot-ring, neck-ring) but without the valve or dip tube.
The tare of each cylinder expressed in kilograms shall also be permanently marked to two decimal places
rounded down. The tare shall be the mass of the cylinder plus the mass of the valve and dip tube. The mass
of the horn (spray nozzle) shall not be included.
7 New design tests
7.1 General requirements
7.1.1 Testing shall be carried out for each new design of cylinder. A previously approved cylinder design
shall be considered to be of a new design when any of the following conditions apply:
— it is manufactured by a different plant;
— it is manufactured by a different process (this includes the case when major process changes are made
during the production period);
— it is manufactured from an alloy of different specified composition limits from that used in the original type
test;
— it
...
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