GB/T 3535-2006 (GB/T3535-2006, GBT 3535-2006, GBT3535-2006)
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Petroleum products -- Determination of pour point
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GB/T 3535-2006
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Standards related to: GB/T 3535-2006
| Standard ID | GB/T 3535-2006 (GB/T3535-2006) | | Description (Translated English) | Petroleum products - Determination of pour point | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E30 | | Classification of International Standard | 75.080 | | Word Count Estimation | 8,868 | | Date of Issue | 2006-01-23 | | Date of Implementation | 2006-10-01 | | Older Standard (superseded by this standard) | GB/T 3535-1983 | | Adopted Standard | ISO 3016-1994, MOD | | Drafting Organization | China Petroleum & Chemical Corporation Research Institute of Petroleum and Chemical Sciences | | Administrative Organization | China Petroleum & Chemical Corporation Research Institute of Petroleum and Chemical Sciences | | Regulation (derived from) | China National Standard Approval Announcement 2006 No.8 (Total No.95) | | Proposing organization | China Petroleum & Chemical Corporation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the method for determining the pour point of petroleum products. Also describes the measurement of fuel material, pour point test procedure under heavy lubricant base oil and a residue containing a fuel component product. | GB/T 3535–2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.080
E 30
Replacing GB/T 3535-1983
Petroleum products - Determination of pour point
(ISO 3016.1994, MOD)
ISSUED ON. JANUARY 23, 2006
IMPLEMENTED ON. OCTOBER 01, 2006
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Terms and definitions ... 5
3 Principle ... 5
4 Reagents and materials ... 5
5 Apparatus (see figure 1) ... 6
6 Test procedure ... 7
7 Expression of results ... 10
8 Precision ... 10
9 Test report ... 11
Annex A (Normative) Thermometer specifications ... 12
Foreword
This Standard modifies and adopts ISO 3016.1994 “Petroleum Products - Determination
of Pour Point”.
This Standard is redrafted based on ISO 3016.1994.
In order to be suitable for Chinese situation, this Standard makes modifications when
adopting ISO 3016.1994. The technical differences between this Standard and ISO
3016.1994 are as follows.
- Add the regulations of “taking average value of two results of repeated
measurement as the test results”.
In order to be ease of use, this Standards makes editorial changes as follows.
- Wording expression of repeatability and reproducibility are modified based on the
habit of our country.
This Standard replaces GB/T 3535-1983 “Petroleum - Determination of Pour Point”.
Main technical differences between this Standard and GB/T 3535-1983 are as follows.
- The name of this Standard is changed to “Petroleum Products - Determination of
Pour Point” from “Petroleum - Determination of Pour Point”.
- In Clause “Scope”, provision “general steps can be used for measurement of oil pour
point, but precision is not applicable” is added as NOTE;
- Clause “reagents and materials” is added; and common refrigerant preparation of -
18°C, -33°C, -51°C and -69°C cold bath is supplemented;
- For sleeve in pour point tester, it defines that only metal sleeve can be used; and
glass sleeve in the GB/T 3535-1983 is deleted;
- Test procedures are separately described in accordance with two conditions. above
-33°C for pour point, and blow or equal to -33°C for pour point. Test procedures of
GB/T 3535-1983 were described in accordance with three conditions. 33°C~-33°C,
above 33°C, and below -33°C;
- For oil products of which the pour point specification value is not multiple-times of
3°C, it may conduct the test based on 6.9; result shall report if samples can pass or
not pass the specification value;
- Add automatic instrument, however, the precision is not applicable;
- Repeatability and reproducibility of this Standard are both applicable to
determination of oil products (including fuel oil, residual fuel oil) pour point; while
reproducibility of GB/T 3535-1983 is not applicable to determination of oil products
(including fuel oil, residual fuel oil) pour point;
- Add thermometer used for melting point and relevant technical conditions.
Annex A of this Standard is normative.
This Standard was proposed by Sinopec Group.
This Standard shall be under the jurisdiction of SINOPEC Research Institute of Petroleum
Processing (RIPP).
Drafting organization of this Standard. SINOPEC Research Institute of Petroleum
Processing (RIPP).
Main drafters of this Standard. Guo Tao, and Chen Jie.
Previous version replaced by this Standard is as follows.
— GB/T 3535-1983.
Petroleum products - Determination of pour point
WARNING — The use of this Standard may involve hazardous materials,
operations and equipment. This Standard does not purport to address all safety
problems associated with its use. It is the responsibility of the user of this Standard
to establish appropriate safety and health practices, and determine the applicability
of regulatory limitations prior to use.
1 Scope
This Standard specifies a method for determination of the pour point of petroleum products.
A separate procedure suitable for determination of lower pour point (see 6.10) of fuel oils,
heavy lubricant base stock, and products containing residual fuel components is also
described.
NOTE. A method for the pour point of crude oils is under development. The pour point of crude oils may
be determined by the general procedure described in this Standard, but some crude oils may
need a modified pretreatment to avoid the loss of volatile material. The precision in this Standard
was derived on a sample matrix that did not include crude oils (see NOTE in Clause 8).
2 Terms and definitions
For the purposes of this Standard, the following term and definition applies.
pour point
The lowest temperature at which a sample of petroleum product will continue to flow when
it is cooled under specified standard conditions.
3 Principle
After preliminary heating, the sample is cooled at a specified rate and examined at intervals
of 3°C for flow characteristics. The lowest temperature at which movement of the sample
is observed is recorded as the pour point.
4 Reagents and materials
4.1 Sodium chloride (NaCI), crystals.
4.2 Calcium chloride (CaCI2), crystals.
4.3 Carbon dioxide (C02), solid.
4.4 Coolant liquid. acetone, methanol or petroleum naphtha.
the sample to a temperature greater than 45°C to effect the transfer to the test jar, or when
it is known that a sample has been heated to a temperature higher than 45°C during the
preceding 24 h, or when the thermal history of the sample is not known, keep the sample
at room temperature for 24 h before testing it.
6.2 Close the test jar with the cork carrying the high-cloud-and-pour thermometer or, if the
expected pour point is above 36°C, with the melting point thermometer (annex A). Adjust
the position of the cork and thermometer so that the cork fits tightly, the thermometer and
the test jar are coaxial, and the thermometer bulb is immersed to a depth which places the
beginning of the capillary 3 mm below the surface of the sample.
6.3 Subject the sample in the test jar to a preliminary treatment, appropriate to its pour
point, in accordance with 6.4 or 6.5.
6.4 Samples having pour points above - 33°C shall be treated as follows.
6.4.1 Heat the sample without stirring to 9°C above the expected pour point, or to 45°C,
whichever is greater, in a bath maintained at 12°C above the expected pour point, but at
least 48°C.
6.4.2 Transfer the test jar to a bath maintained at 24°C ± 1.5°C.
6.4.3 When the sample temperature reaches 9°C above the expected pour point
(estimated as a multiple of 3°C), commence observations for flow in accordance with 6.7.
6.4.4 If the sample has not ceased to flow when the temperature has reached 27°C,
carefully remove the test jar from the bath, wipe the outer surface with a clean cloth
moistened with wiping fluid (4.5), and place it in the 0°C bath (5.7) in accordance with 6.6.
Make observations for flow in accordance with 6.7 and cool as specified in the schedule
given in 6.8.
6.5 Samples having pour points of - 33°C and below shall be treated as follows.
6.5.1 Heat the sample without stirring to 45°C in a bath maintained at 48°C, and cool to
15°C in a bath maintained at 6°C ± 1.5°C.
6.5.2 When the temperature has reached 15°C, carefully remove the test jar from the water
bath, wipe the outer surface with a clean cloth moistened with wiping fluid, remove the
high-cloud-and-pour thermometer and replace it with the low-cloud-and-pour thermometer
(annex A). Place the test jar in the 0°C bath in accordance with 6.6. Successively place the
test jar into lower-temperature baths in accordance with the schedule specified in 6.8.
6.5.3 When the temperature reaches 9°C above the expected pour point, commence
observations for flow in accordance with 6.7.
6.6 Ensure that the disc, gasket and the inside of the jacket are clean and dry, and place
the disc in the bottom of the jacket. The disc and jacket shall have been placed in the
cooling medium a minimum of 10 min before the test jar is inserted. Place the gasket
around the test jar approximately 25 mm from the bottom, and insert the test jar into the
specification temperature is reached. Report the sample as passing or failing the
specification limit.
6.10 For fuel oils, heavy lubricant base stock and products containing residual fuel
components, the result obtained by the procedure given in 6.1 to 6.8 is the upper
(maximum) pour point. If required, determine the lower (minimum) pour point by heating
the sample while stirring to 105°C, pouring it into the jar, and determining the pour point as
given in 6.2 to 6.8.
6.11 If automatic testing instruments are used, the user shall ensure that all of the
manufacturer's instructions for calibration, adjustment and operation of the instrument are
followed. As the p...
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