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MT 76-2011: [MT/T 76-2011] Emulsifying oil, concentrate fluid and high-water content hydraulic fluid used for powered support
MT/T 76-2011 (renamed from MT 76-2011)
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.100.99
D 97
Record no.. 34154-2012
MT/T 76-2011
Replacing MT 76-2002
Emulsifying oil, concentrate fluid and high-water
content hydraulic fluid used for powered support
及其高含水液压液
ISSUED ON. NOVEMBER 16, 2011
IMPLEMENTED ON. MAY 31, 2012
Issued by. State Administration of Work Safety
Table of Contents
Foreword ... 3 
1 Scope .. 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Classification .. 6 
5 Technical requirements ... 7 
6 Test methods .. 8 
7 Inspection rules .. 12 
8 Marking, packaging, transportation and storage ... 14 
Annex A (Normative) Requirements for test hard-water and test fluid
preparation ... 15 
Annex B (Normative) Special test apparatus ... 16 
Foreword
Clauses 5.1, 5.2, 5.7, 5.14 and 5.15 of this Standard are voluntary; and the rest
are compulsory.
This Standard is a revision of MT 76-2002, Emulsifying oil concentrate and high-water
content hydraulic fluid used for powered support and prop. This Standard replaces MT
76-2002 from the data of implementation.
Compared with MT 76-2002, the major changes of this Standard are as follows.
-- the standard name is changed, in which “and prop” is deleted and “concentrate”
is changed into “concentrate liquid” (see the cover and text of 2002 edition and
this edition);
-- the product type specification is changed (see 4.2; 4.2 of 200d edition);
-- the relevant content of solid-state powder concentrate is deleted (see 5.2 of 2002
edition);
-- the technical requirements for open cup flash point are modified (see 5.3; 5.1.3
of edition 2002);
-- the technical requirements and test methods including odour, antifoaming
performance and refractometer reading (see 5.2, 5.14, 5.15, 6.3, 6.15 and 6.16);
-- the pH technical requirements are modified (see 5.8; 5.3.2 of 2002 edition);
-- the “preparation of test water” is added (see 6.1);
-- the test conditions and methods are modified (see 6.2, 6.4, 6.6, 6.9, 6.11 and 6.12;
6.1, 6.3, 6.4, 6.7, 6.9 and 6.10 of 2002 edition).
Annex A and Annex B of this Standard are normative.
This Standard was proposed by China Coal Industry Association.
This Standard shall be under the jurisdiction of the National Technical Committee on
Special Equipment for Coal Industry and Coal Mines.
China Coal Research Institute Testing Sub-Institute is responsible for the drafting of
this Standard; China Coal Research Institute Industrial Oils Business Division and
Datong Yunyan Petrochemical Co., Ltd. participate in the drafting.
The main drafters of this Standard. Wang Ping, Jia Dajun, Han Yong, Liu Shanshan,
Yu Chunlan, Wang Jiyong, Du Yong.
The previous editions of the standard replaced by this Standard are as follows.
Emulsifying oil, concentrate fluid and high-water
content hydraulic fluid used for powered support
1 Scope
This Standard specifies. the emulsifying type (HFAE) and solution type (HFAS) high-
water content hydraulic fluids; and the terms and definitions, product classification,
technical requirements, test methods, inspection rules and marking, packaging,
transportation and storage of emulsifying oils and concentrate fluids for the preparation
of the hydraulic fluid.
This Standard applies to the high-water content hydraulic fluids for hydraulic supports,
outside-pourable single hydraulic props, etc. and the emulsifying oils and concentrate
fluids for the preparation of the hydraulic fluids.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
GB 265-1988, Petroleum products - Determination of kinematic viscosity and
calculation of dynamic viscosity
GB/T 510-1983, Petroleum products - Determination of solidification point
GB/T 3142, Lubricants - Determination of load carrying capacity (four balls method)
GB/T 3536-2008, Petroleum products - Determination of flash and fire points -
Cleveland open cup method (ISO 2592.2000, MOD)
GB/T 4756, Method for manual sampling of petroleum liquids (GB/T 4756-1998,
ISO 3170.1988, NEQ)
GB/T 5231-2001, Wrought copper and copper alloys - Chemical composition limits
and forms of wrought products
GB/T 7631.2, Lubricants, industrial oils and related products (class L) -
Classification - Part 2. family H (hydraulic systems)
GB/T 11143-2008, Standard test method for rust-preventing characteristics of
Weigh accurately 2.922 g of sodium chloride (of analytical purity); dissolve in distilled
water or deionized water; and use distilled water or deionized water to dilute to 1 L.
6.2 Appearance
At 10°C ~ 35°C, inject the emulsifying oil or concentrated fluid to be tested to the 100-
ml scale of a 100-ml colorimetric tube of diameter 30 mm; use a stopper to seal; use a
5 W/220 V incandescent light bulb to irradiate the side of the colorimetric tube; and
observe the filament through the test sample. if the filament can be seen clearly, it is
transparent; if the filament is invisible or blurry, it is non-transparent. Reverse the
colorimetric tube; the film formed on the wall of the colorimetric tube shall be uniform.
6.3 Odour
Through olfactory test, emulsifying oils or concentrated fluids shall have no pungent
smell.
6.4 Open cup flash point
The flash point of emulsifying oils and concentrated fluids is tested as specified in GB/T
3536-2008, but the provision of 10.3 is not implemented. The bottom of thermometer
bulb is 6 mm from the bottom of test cup. If forming or overflow occurs during the
heating process, slow down the temperature-rise speed; and restore the normal
temperature-rise speed after foam reduces. If a fluid overflows from test cup, then the
test is invalid, and test shall be conducted once again. For some samples, they are
heated until water is nearly evaporated dry; and when the sample in test cup is in the
viscous semi-solid state or the upper part of thermometer bulb emerges above the fluid
level and the steam on the surface of the sample does not flash, then the flash point
of the sample is determined to be “none”.
6.5 Kinetic viscosity
The kinetic viscosity of emulsifying oils or concentrated fluids are tested as specified
in GB/T 265-1988, but the provision of 4.1 is not implemented.
6.6 Condensation point
The condensation point of emulsifying oils or concentrated liquids are tested as
specified in GB/T 510-1983, but the provision of 4.2 is not implemented. For some
samples, temperature rise occurs during the test, so the maximum temperature during
the temperature reduction process before the temperature rise.
6.7 Freeze-thaw resistance
Inject emulsifying oils or concentrated fluids to the 100-ml scale of a 100-ml
colorimetric tube of diameter 300 mm; use a stopper for sealing; place into a
refrigeration equipment for 8 h at - 21°C ~ - 16°C; take it out and store for 16 h at 10°C
~ 35°C. This is deemed as a freeze-thaw process. After repeating 5 cycles, observe
concentration for oscillation stability test specified in Table A.2 in Annex A; inject into
the treated 100-ml measuring cylinder with a stopper to the 50-ml scale; plug the
cylinder closely with the stopper; use hand to hold the cylinder to oscillate for 1 min
under the ...