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SH/T 0805-2008: Determination of the filterability of lubricating oils
SH/T 0805-2008
SH
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.100
E34
Determination of the filterability of lubricating oils
(ISO 13357-2.2005, Petroleum products - Determination of the filterability of
lubricating oils - Part 1. Procedure for dry oils; ISO 13357-1.2002, Part 2.
Procedure for oils in the presence of water, MOD)
ISSUED ON. APRIL 23, 2008
IMPLEMENTED ON. OCTOBER 01, 2008
Issued by. National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Method one (dry method) ... 6 
5 Method two (wet method) ... 13 
6 Test report ... 15 
Annex A ... 16 
Annex B ... 17 
Foreword
This Standard modifies and adopts international standards ISO 13357-2.2005
“Petroleum products – Determination method of the filterability of lubricating oils –
Part 2. Procedure for dry oils” and ISO 13357-1.2002 “Petroleum products –
Determination method of the filterability of lubricating oils – Part 1. Procedure for oils
in the presence of water”.
The method one in this Standard is redrafted according to the standard ISO
13357-2.2005; the method two is redrafted according to the standard ISO13357
-1.2002.
In order to suit to the national condition of China, this Standard is partly modified when
adopting ISO 13357-2.2005 and ISO13357-1.2002. The comparison table between
the chapter and article numbers of this Standard and the chapter and article numbers
of ISO 13357-2.2005 and ISO13357-1.2002 is shown in Annex B. The main technical
differences between this Standard AND ISO 13357-2.2005 and ISO13357-1.2002 are
as follows.
— CHANGE the 70°C ± 10°C of the oven precision in method one in ISO
13357-2.2005 TO 70°C ± 2°C. The change is done to simplify the test device for
the 70°C ± 2°C of the oven precision used in method two.
— CHANGE some of reference standards TO current national standards in China.
— MODIFY the repeatability and reproducibility textual representation according to
the habits in China.
Annex A and Annex B in this Standard are informative.
This Standard was proposed by China Petrochemical Corporation (Sinopec Group).
This Standard shall be under the jurisdiction of Research Institute of Petroleum and
Petrochemicals of China Petrochemical Corporation.
Drafting organizations of this Standard. Dalian Lubricant Research and Development
Center of PetroChina Company Limited, and Lubricant Research and Development
Center (Beijing) of China Petrochemical Corporation.
Main drafters of this Standard. Li Chuncheng, Cui Haiou, and Yanghua.
Introduction
As a lubricant in hydraulic system, the main function of the fluid is to reduce the wear
and tear of mechanical components. Therefore, lowering the concentration of the hard
particle contamination in the system is very important, especially in the sophisticated
systems with small gap. Generally, the particulate contaminants are removed through
filters. The capacity of not being clogged by hydraulic oil when it passes through filters
with certain specification is called filterability. ISO 13357-1 describes the laboratory
determination methods for evaluating the filterability of the mineral oil after being
heated in the presence of water. ISO 13357-2 describes the laboratory determination
method for evaluating the filterability of the mineral oil under dry environment. The
filterability defined here is not the physical property of oil products, but reflects the
performance assessment of oils at work.
Each part of the ISO 13357 method contains two evaluation methods, known as the
"stages". Stage I utilizes the ratio between the mean flow rate of the fluid through the
filtration membrane and the initial flow rate to evaluate the filterability. When the fluid
has good filterability at stage I, while has poor filterability in stage II (see below), the
use of it will not generate performance problems generally, unless the very
sophisticated system filter is used.
Stage II uses the ratio between the mean flow rate of the fluid through the filtration
membrane and the initial flow rate to evaluate the filterability. It is generally believed
that the test conditions at stage II are more demanding, and more sensitive to the gel
and fine debris in the oil products. Especially in the aging of oil or the heating at high
temperatures, the debris and gel are easier to generate. If oils at stage II has good
filterability, it will not arise filtration problem even under extreme conditions or under
the condition where the precision filter (pore diameter is less than 5μm) is used.
Therefore, this kind of oil product is applicable to more demanding hydraulic and
lubrication systems.
This test method can be used to evaluate mineral oil with ISO viscosity grade being
not higher than 100, and does not apply to oil products with higher viscosity grade. At
present, the actual reason has not been found (the highest viscosity of oil products
used in reality is 220). Similarly, the applicable scope of this method can also be
expanded to fluids other than mineral oils. However, some fluids, such as fire
resistance fluid, are not compatible with the filtration membrane specified in this
method. For these fluids, even the filtration membrane with the same pore size and
same pore density are used, the obtained test data can only be used for comparison.
Determination of the Filterability of Lubricating Oils
Warning. this Standard may involves certain hazardous materials, equipment, and
operations. However, the recommendations about relevant safety problem of
equipment are not ALL been proposed. Therefore, the user has the responsibility to
establish appropriate safety and protective measures before using this Standard, and
determine the corresponding management system.
1 Scope   
1.1 This Standard specifies the determination of filterability of lubricating oil taking
mineral oil as base oil, especially the method for evaluating the filterability of hydraulic
oil in hydraulic system. This Standard applies to oils with viscosity grade being not
higher than 100 according to the viscosity classification provisions of GB/T 3141. This
Standard does not apply to liquids taking other materials as base material, such as
fire resistant fluid, because there may be compatibility problems between it and the
filtration membrane used in this Standard. This Standard does not apply to hydraulic
oil with special properties, because it may contain insolvable additives or partially
dissolved additives or special macromolecular substances.
1.2 Method one. dry method; it is suitable for evaluating the filterability of lubricating
oils under dry conditions.
1.3 Method two. wet method; it is suitable for evaluating the filterability of lubricating
oils in the presence of water.
2 Normative references 
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 3141 Industrial liquid lubricants - ISO viscosity classification (GB/T
3141-1994, eqv ISO 3448.1992)
GB/T 4756 Petroleum l...