Filters for compressed air -- Test methods

ISO 12500-2:2007 specifies the test layout and test procedures required for testing hydrocarbon vapour adsorbent filters used in compressed air systems to determine their effectiveness in removing hydrocarbon vapours. The performance characteristics to be identified are the adsorptive capacity and the pressure drop. ISO 12500-2:2007 defines one method of presenting filter performance as hydrocarbon-vapour capacity, expressed in milligrams, from results obtained under test conditions.

Filtres pour air comprimé -- Méthodes d'essai

General Information

Status
Published
Publication Date
03-Jun-2007
Current Stage
6060 - International Standard published
Start Date
02-Apr-2007
Completion Date
04-Jun-2007
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ISO 12500-2:2007 - Filters for compressed air -- Test methods
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INTERNATIONAL ISO
STANDARD 12500-2
First edition
2007-06-01
Filters for compressed air — Test
methods —
Part 2:
Oil vapours
Filtres pour air comprimé — Méthodes d'essai —
Partie 2: Vapeurs d'huile
Reference number
ISO 12500-2:2007(E)
ISO 2007
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ISO 12500-2:2007(E)
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© ISO 2007

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Published in Switzerland
ii ISO 2007 – All rights reserved
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ISO 12500-2:2007(E)
Contents Page

1 Scope .................................................................................................................................................... 1

2 Normative references .......................................................................................................................... 1

3 Terms and definitions .......................................................................................................................... 1

4 Units and symbols ............................................................................................................................... 2

5 Reference conditions .......................................................................................................................... 2

6 Test requirements ................................................................................................................................ 3

7 Test method .......................................................................................................................................... 4

8 Uncertainty ........................................................................................................................................... 6

9 Test report ............................................................................................................................................ 7

Annex A (informative) Description and application of the test equipment ............................................. 8

Annex B (informative) Sample test report form ......................................................................................... 9

Bibliography ............................................................................................................................................... 10

ISO 2007 – All rights reserved iii
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ISO 12500-2:2007(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International

Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 12500-2 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines

and equipment, Subcommittee SC 4, Quality of compressed air.

ISO 12500 consists of the following parts, under the general title Filters for compressed air — Test methods:

— Part 1: Oil aerosols
— Part 2: Oil vapours
— Part 3: Particulates
iv ISO 2007 – All rights reserved
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ISO 12500-2:2007(E)
Introduction

Oil adsorbent filters (e.g. activated carbon. etc.) are designed for the removal of oil vapours and odours from

compressed air or gas streams.

The most important performance characteristics of the filter are its ability to remove hydrocarbon vapours, its

total adsorptive capacity and pressure drop.

The aim of this part of ISO 12500 is to define a method and test condition by which the above characteristics

can be measured and compared.
ISO 2007 – All rights reserved v
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INTERNATIONAL STANDARD ISO 12500-2:2007(E)
Filters for compressed air — Test methods —
Part 2:
Oil vapours
1Scope

This part of ISO 12500 specifies the test layout and test procedures required for testing hydrocarbon vapour

adsorbent filters used in compressed-air systems to determine their effectiveness in removing hydrocarbon

vapours. The performance characteristics to be identified are
— adsorptive capacity;
— pressure drop (∆p).

This part of ISO 12500 defines one method of presenting filter performance as hydrocarbon vapour capacity,

expressed in milligrams, from results obtained under test conditions.
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.

ISO 1219-1, Fluid power systems and components — Graphic symbols and circuit diagrams — Part 1: Graphic

symbols for conventional use and data-processing applications

ISO 2602, Statistical interpretation of test results — Estimation of the mean — Confidence interval

ISO 2854, Statistical interpretation of data — Techniques of estimation and tests relating to means and

variances
ISO 5598, Fluid power systems and components — Vocabulary
ISO 7000, Graphical symbols for use on equipment — Index and synopsis
ISO 8573-1:2001, Compressed air — Part 1: Contaminants and purity classes

ISO 8573-6, Compressed air — Part 6: Test methods for gaseous contaminant content

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.

3.1
activated carbon

charcoal which has an enhanced property of attracting certain gases or vapours into the pore structure of its

surface layer
ISO 2007 – All rights reserved 1
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ISO 12500-2:2007(E)
3.2
adsorbent

solid having the property of attracting gaseous or liquid molecules and causing them to adhere to its surface

3.3
adsorptive capacity
mass of a contaminant that can be adsorbed by tested filter
3.4
ambient temperature
temperature of the air surrounding the filter housing under test
3.5
breakthrough

point when a determined amount of the test agent is detected downstream of the adsorbent filter

3.6
equivalent rated flow

flow at which, when the test filter is operated at a 700 kPa [7 bar (e)] test pressure, an equal gas velocity to that

for the device would be achieved were it to be operated at its rated pressure and flow

3.7
filter

apparatus for separation or removal of contamination from a compressed air or gas stream

3.8
pressure drop
differential pressure

difference between the inlet and outlet pressure of a component, measured under specified conditions

3.9
test agent
n-hexane vapour used to challenge the filter under test
4 Units and symbols

General use of SI units (Système international d'unités; see ISO 1000) as given throughout this part of

ISO 12500 is recommended. However, in agreement with accepted practice in the pneumatic field, some

non-preferred SI units, accepted by ISO, are also used.
1 bar = 100 000 Pa
NOTE bar (e) is used to indicate effective pressure above atmospheric.
1 l (litre) = 0,001 m
The graphic symbols on diagrams are in accordance with ISO 1219-1 and ISO 7000.
5 Reference conditions
The reference conditions for gas volumes shall be:
a) air temperature 20 C;
b) absolute air pressure 100 kPa [1 bar (a)];
c) relative water vapour pressure 0.
2 ISO 2007 – All rights reserved
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ISO 12500-2:2007(E)
6 Test requirements
6.1 Standard rating parameters
The standard rating parameters are as identified in Table 1.
Table 1 — Standard rating parameters
Maintain within actual Instrument accuracy
Reporting parameter Units Rating conditions
gauge value at test conditions
◦ ◦
Inlet temperature C 20 ± 5 ± 2 C
± 10 kPa ()± 0,1 bar
Inlet pressure kPa [bar (e)] 700 (7) ± 10 (0,1)
gauge reading
◦ ◦
Ambient temperature C 20 ± 5 ± 2 C
Test agent
mg/kg 1 000 ± 50 ± 0,1 %
concentration in air
b c
Minimum air purity — ISO 8573-1:2001, Class 2 2 1
Air flow for testing m /h 100 % rated flow ±2% ±4% gauge reading
± 1 kPa()± 10 mbar
Pressure drop Pa (mbar) Not applicable Not applicable
gauge reading
a 3
Density of air is taken as 1,18 kg/m .

Minimum air purity to ensure that the filter under test is not affected by the presence of water vapour.

The first number represents the solid-particle classification; the second, the humidity classification; and the third, the total oil

classification.
6.2 Inlet air flow

Testing of hydrocarbon vapour adsorbent filters shall be carried out at the manufacturer's equivalent rated flow.

For the testing of filters that have their maximum flow rating quoted at a pressure other than 700 kPa [7 bar (e)]

the measurement for hydrocarbon vapour removal can be made using equivalent flow velocity at rated pressure

identified by the manuf
...

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