ISO 10050:2024

Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specifications of triaryl phosphate ester turbine control fluids (category ISO-L-TCD)

ISO 10050:2024

Name:ISO 10050:2024   Standard name:Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specifications of triaryl phosphate ester turbine control fluids (category ISO-L-TCD)
Standard number:ISO 10050:2024   language:English language
Release Date:22-Jul-2024   technical committee:ISO/TC 28/SC 4 - Classifications and specifications
Drafting committee:ISO/TC 28/SC 4/WG 16 - Classifications and specifications of Industrial gear oils, turbine oils and compressor oils   ICS number:75.120 - Hydraulic fluids

International
Standard
ISO 10050
Second edition
Lubricants, industrial oils and
2024-07
related products (class L) — Family
T (Turbines) — Specifications of
triaryl phosphate ester turbine
control fluids (category ISO-L-TCD)
Lubrifiants, huiles industrielles et produits connexes (classe
L) — Famille T (Turbines) — Spécifications pour les fluides
de régulation de turbines à base d'esters de triaryl phosphate
(catégorie ISO-L-TCD)
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Composition . 2
5 Safety precautions. 3
6 Dyes . 3
7 Sampling . 3
8 Required characteristics . 3
9 Precision and interpretation of test results . 3
Bibliography . 6

iii
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,
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels and
lubricants from natural or synthetic sources, Subcommittee SC 4, Classifications and specifications.
This second edition cancels and replaces the first edition (ISO 10050:2005), which has been technically
revised.
The main changes are as follows:
— addition of precisions about the composition of the products;
— addition of safety precautions;
— updates of the specifications:
— the temperature for elastomer compatibility has been lowered to 60 °C to reflect the conditions of use;
— the corrosiveness to copper test has been added;
— the maintenance and use guide IEC 60978 has been replaced by ISO 11365.
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
International Standard ISO 10050:2024(en)
Lubricants, industrial oils and related products (class L) —
Family T (Turbines) — Specifications of triaryl phosphate
ester turbine control fluids (category ISO-L-TCD)
WARNING — The handling and use of products as specified in this document can be hazardous, if
suitable precautions are not observed. This document does not purport to address all the safety
problems associated with its use. It is the responsibility of the users of this document to establish
appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use.
1 Scope
This document specifies the characteristics of unused triaryl phosphate ester fluids for turbine governor
controls and other hydraulic systems in electrical power stations. Fluids used in this application are
classified under category TCD of ISO 6743-5.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between 10
IRHD and 100 IRHD
ISO 760, Determination of water — Karl Fischer method (General method)
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 2160, Petroleum products — Corrosiveness to copper — Copper strip test
ISO 2592, Petroleum and related products — Determination of flash and fire points — Cleveland open cup method
ISO 3016, Petroleum and related products from natural or synthetic sources — Determination of pour point
ISO 3104, Petroleum products — Transparent and opaque liquids — Determination of kinematic viscosity and
calculation of dynamic viscosity
ISO 3170, Petroleum liquids — Manual sampling
ISO 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydrometer method
ISO 4259-2, Petroleum and related products — Precision of measurement methods and results — Part 2:
Interpretation and application of precision data in relation to methods of test
ISO 4406, Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles
ISO 6247, Petroleum products — Determination of foaming characteristics of lubricating oils
ISO 6614, Petroleum products — Determination of water separability of petroleum oils and synthetic fluids
ISO 6619, Petroleum products and lubricants — Neutralization number — Potentiometric titration method

ISO 9120, Petroleum and related products — Determination of air-release properties of steam turbine and other
oils — Impinger method
ISO 12185, Crude petroleum, petroleum products and related products — Determination of density —
Laboratory density meter with an oscillating U-tube sensor
ISO 12937, Petroleum products — Determination of water — Coulometric Karl Fischer titration method
ISO 13226, Rubber — Standard reference elastomers (SREs) for characterizing the effect of liquids on
vulcanized rubbers
ISO 14935, Petroleum and related products — Determination of wick flame persistence of fire-
...

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