ISO 12829:2023
(Main)Hydraulic spin-on filters with finite lives — Method for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope
Hydraulic spin-on filters with finite lives — Method for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope
This document specifies methods for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope (i.e. the filter housing) of a spin-on hydraulic filter with a disposable filter element and a finite life.
Filtres hydrauliques à visser ayant une durée de vie spécifiée — Méthode de vérification de la durée de vie nominale en fatigue et de la pression statique d'éclatement nominale de l'enveloppe sous pression
ISO 12829:2016 spécifie des méthodes de vérification de la durée de vie nominale en fatigue et de la pression statique d'éclatement nominale de l'enveloppe sous pression (c'est-à-dire du corps du filtre) d'un filtre hydraulique à visser ayant un élément filtrant jetable et une durée de vie spécifiée. La durée d'utilisation du corps de ce type de filtre est relativement réduite, une durée de vie nominale en fatigue de 100 000 cycles est donc considérée comme suffisante pour des applications industrielles courantes.
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12829
Second edition
2023-11
Hydraulic spin-on filters with finite
lives — Method for verifying the rated
fatigue life and the rated static burst
pressure of the pressure-containing
envelope
Filtres hydrauliques à visser ayant une durée de vie spécifiée —
Méthode de vérification de la durée de vie nominale en fatigue et de la
pression statique d'éclatement nominale de l'enveloppe sous pression
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Samples . 2
5 Cyclic endurance test to verify the rated fatigue life at a rated fatigue pressure .2
5.1 Apparatus . 2
5.2 Test conditions . 3
5.3 Test procedure . 3
5.4 Failure criteria . 4
5.5 Calculation of rated fatigue life at rated fatigue pressure . 4
5.6 Verification . . 5
6 Burst test to verify the rated static burst pressure. 5
6.1 Apparatus . 5
6.2 Test conditions . 5
6.3 Test procedure . 5
6.4 Failure criteria . 6
6.5 Calculation of rated static burst pressure . 6
6.6 Verification . 6
7 Presentation of data .6
8 Verification of rated fatigue life, rated fatigue pressure and rated static burst
pressure by similarity.7
9 Similarity between filters under test and production components .7
10 Identification statement (reference to this document) . 7
Annex A (informative) Results of the round robin test program conducted to verify the
procedure specified in this document . 8
Bibliography .10
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee
SC 6, Contamination control.
This second edition cancels and replaces the first edition (ISO 12829:2016), of which has been
technically revised.
The main changes are as follows:
— a key was added to Figure 1;
— test fluid was revised;
— Figure 2 was revised.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure
within an enclosed circuit. A basic requirement of hydraulic fluid power components is that they should
be capable of adequately containing the pressurized fluid.
The pressure to which an individual component can normally be subjected has a relationship with the
rated fatigue pressure and minimum burst pressure. This relationship can be estimated and used as a
basis of total life expectancy for the component in an individual application. Such an estimate is applied
by the user. Factors such as shock, heat, misuse, etc., are to be judged by the user in each application.
Selection of a specific pressure and life expectancy for a component in a particular application can
be based upon the rated fatigue pressure and burst pressure as described in Figure 1. This finite life
pressure rating test procedure differs from the (NFPA)T2.6.1 R2 infinite life pressure rating document
(which is referred to in ISO/TR 10771-2) and can be visualized from the S-N diagram in Figure 1. (NFPA)
T2.6.1 R2 is a rating system along the vertical axis, with its fatigue strength distribution and assurance
level in the vertical direction at a defined life. The finite life method described in this document is a
rating system along the horizontal axis, with its fatigue life distribution and assurance level in the
horizontal direction at a defined stress (pressure).
Key
X cycles 5 applied pressure
Y pressure 6 verified safe range
1 burst point 7 fatigue life/rated fatigue pressure
2 rated static burst pressure 8 rated fatigue pressure
3 fatigue failure range 9 life expectancy
4 unverified safe range
Figure 1 — Possible S-N curve method for estimating finite life rating
Because the service life of the element container for a finite life spin-on hydraulic filter is relatively
short, a fatigue life of 100 000 cycles is judged sufficient for common industrial ratings. Ratings at levels
other than 100 000 cycles are permitted; this document may be applied for those cases. The method of
rating includes both pressure and minimum life. The pressure rating of the filter head or mounting base
can be subjected to the full 10 fatigue cycles established by (NFPA)T2.6.1 R2.
The spin-on housing, because of its construction, can be tested and evaluated as an elastic body with
specific pressure cycle test times and pressure rise rate conditions.
This document deals only with verifying the pressure ratings of spin-on filters. Separate from this
verification procedure, manufacturers have the continuing responsibility to use managerial controls
necessary to test spin-on filters that are representative of production.
v
INTERNATIONAL STANDARD ISO 12829:2023(E)
Hydraulic spin-on filters with finite lives — Method for
verifying the rated fatigue life and the rated static burst
pressure of the pressure-containing envelope
WARNING — The use of this document can involve hazardous materials, operations and
equipment. This document does not purport to address all of the safety concerns associated
with its use. The user of this document is responsible, prior to its use, to establish appropriate
safety and health practices and to determine the applicability of regulatory limitations.
1 Scope
This document specifies methods for verifying the rated fatigue life and the rated static burst pressure
of the pressure-containing envelope (i.e. the filter housing) of a spin-on hydraulic filter with a disposable
filter element and a finite life.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 5598, Fluid power systems and components — Vocabulary
ISO/TR 19972-1, Hydraulic fluid power — Methods to assess the reliability of hydraulic components — Part
1: General procedures and calculation method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
rated fatigue life
N
f
minimum expected life, expressed in cycles, with a specified assurance level, that a filter housing can
sustain at a rated pressure
3.2
rated fatigue pressure
p
fr
pressure that a filter housing can sustain for a specific number of cycles without failure
3.3
rated static burst pressure
p
Br
maximum pressure that a component pressure containing envelope, selected at random, has been
verified to sustain upon application of the first pressure load, with a known probability
3.4
spin-on filter
filter assembly of which the filter element, housing and means of attaching are unitised into one
inseparable part
4 Samples
Two samples, each consisting of a minimum of six filters under test that are representative of normal
productio
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