SH/T 0305-1993 English PDF (SHT0305-1993)

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SH/T 0305-1993: Determination method for the seal compatibility index of petroleum products
SH/T 0305-93
SH
Petrochemical Industry Standard
of the People’s Republic of China
Replacing SH/T 0305-92
Determination method for the seal compatibility index
of petroleum products
APPROVED ON. JUNE 11, 1993
IMPLEMENTED ON. MAY 1, 1994
Approved by. China Petrochemical Corporation (Sinopec Group).
Table of Contents
1 Subject content and application scope ... 3 
2 Reference standard ... 3 
3 Definition ... 3 
4 Method summary ... 3 
5 Apparatuses and material... 3 
6 Reagent ... 5 
7 Test procedures ... 5 
8 Calculation ... 6 
9 Precision... 8 
10 Report ... 9 
Additional information... 9 
Determination method for the seal compatibility
index of petroleum products
1 Subject content and application scope
This Standard specifies the determination method for the seal compatibility
index of petroleum products.
This Standard applies to petroleum products, excluding the ones containing
water.
2 Reference standard
GB/T 528 Determination of the tensile properties of vulcanized rubber
GB/T 531 Rubber – Determination of Shore A hardness
3 Definition
Seal compatibility index (SCI). It refers to the percentage of volume expansion
that is converted from the diameter expansion of the standard nitrile rubber ring
in the test sample, under the specified test conditions.
4 Method summary
USE a taper gauge to measure the inner diameter of the rubber ring. SOAK the
rubber ring in the test sample at 100°C for 24h. TAKE it out for cooling. USE a
taper gauge to measure the inner diameter change rate of the rubber ring in
unit of the percentage of volume expansion.
5 Apparatuses and material
5.1 Apparatuses
5.1.1 Rubber ring. The rubber rings refer to the square cross-section rings made
from processed nitrile rubber. The inner diameter is 25 ± 0.25mm. The side
length of the square cross section is 1.5 ± 0.15mm.
7.3 PUT a rubber ring in the cooling oil at room temperature. SOAK for 15min.
7.4 USE a bamboo tweezer to take out the soaked rubber ring. PUT it on the
filter paper, so as to drain the oil slick on the surface of the rubber ring. AVOID
stretching or twisting the rubber ring.
7.5 Gently PUT the rubber ring on the taper gauge, so as to measure the inner
diameter of the rubber ring. PLACE the side with less burrs face down on the
taper gauge. During the measurement, USE one hand to gently touch the
rubber ring. USE the other hand to rotate the taper gauge, so as to keep the
rubber ring on the horizon. PAY special attention to avoid stretching the rubber
ring. Furthermore, MAKE sure that there is no visible gap between the rubber
ring and the taper gauge by observation. OBSERVE the lower edge of the
rubber ring. READ out the dimension of inner diameter D1, accurate to 0.025mm
(1/4 scale).
7.6 PUT the rubber ring into the test oil after the measurement. It is only
allowable to put one rubber ring into each wide-mouth bottle. SHAKE the wide-
mouth bottle, so as to totally soak the rubber ring into the test oil. COVER the
lid. PUT the wide-mouth bottle in the drying oven preheated to 100 ± 2°C
immediately. KEEP the drying oven at constant temperature for 24h.
7.7 After keeping at constant temperature for 24h, TAKE out the wide-mouth
bottle from the drying oven. USE the bamboo tweezer cleaned with petroleum
ether to take out the rubber ring. PUT the rubber ring into the cooling oil
immediately. COVER the lid. COOL for 45 ± 15min.
7.8 MEASURE according to the steps specified in the Articles 7.4 and 7.5.
READ out the inner diameter dimension of the expanded rubber ring D2,
accurate to 0.025mm (1/4 scale). The expanded rubber ring is extremely easy
to deform. PAY special attention to avoid stretching or twisting the rubber ring
during the measurement.
Note. The overall test procedures must be conducted by the same person.
8 Calculation
8.1 CALCULATE the percentage of volume expansion of the rubber ring SV (%)
according to the Formula (1).
Where.
1.7 5.19 6.7 21.48 11.7 39.37
1.8 5.49 6.8 21.82 11.8 39.74
1.9 5.81 6.9 22.16 11.9 40.12
2.0 6.12 7.0 22.51 12.0 40.49
2.1 6.43 7.1 22.85 12.1 40.87
2.2 6.75 7.2 23.19 12.2 41.25
2.3 7.06 7.3 23.54 12.3 41.62
2.4 7.37 7.4 23.88 12.4 42.00
2.5 7.69 7.5 24.23 12.5 42.38
2.6 8.00 7.6 24.58 12.6 42.76
2.7 8.32 7.7 24.92 12.7 43.14
2.8 8.64 7.8 25.27 12.8 43.52
2.9 8.95 7.9 25.62 12.9 43.91
3.0 9.27 8.0 25.97 13.0 44.29
3.1 9.59 8.1 26.32 13.1 44.67
3.2 9.91 8.2 26.67 13.2 45.06
3.3 10.23 8.3 27.02 13.3 45.44
3.4 10.55 8.4 27.38 13.4 45.83
3.5 10.87 8.5 27.73 13.5 46.21
3.6 11.19 8.6 28.08 13.6 46.60
3.7 11.52 8.7 28.44 13.7 46.99
3.8 11.84 8.8 28.79 13.8 47.38
3.9 12.16 8.9 29.15 13.9 47.76
4.0 12.49 9.0 29.50 14.0 48.15
4.1 12.81 9.1 29.86 14.1 48.54
4.2 13.14 9.2 30.22 14.2 48.94
4.3 13.46 9.3 30.58 14.3 49.33
4.4 13.79 9.4 30.93 14.4 49.72
4.5 14.12 9.5 31.29 14.5 50.11
4.6 14.44 9.6 31.65 14.6 50.51
4.7 14.77 9.7 32.01 14.7 50.90
4.8 15.10 9.8 32.38 14.8 51.30
4.9 15.43 9.9 32.74 14.9 51.69
5.0 15.76 10.0 33.10 15.0 52.09
9 Precision
USE the following provisions to determine the reliability of the obtained results
(95% confidence level).
9.1 Repeatability. The difference between the two results repeatedly measured
by the same operator shall not be greater than .
9.2 Reproducibility. The difference between the two measurement results put
forward by two laboratories shall not be greater than .
①Note. refers to average value.
② The provisions for the degree of precision are obtained after conducting statistical tests to the
samples whose SCI is within the range of 1-35.
10 Report
TAKE the arithmetic average value of the two results obtained from repeat
measurement. The arithmetic average value is rounded to integer, so as to
obtain the SCI of samples as the measurement result.
Additional information.
This Standard shall be under the jurisdiction of the Technical Department of
SINOPEC Research Institute of Petroleum Processing.
This Standard was responsibly drafted by Oil Refinery of Shanghai Gaoqiao
Petrochemical Corporation.
The main drafters of this Standard are Zhi Mian and Ni Minren.
This Standard references to and adopts UK Petroleum Industry Association
standard IP 278/72(88) “Seal compatibility index of petroleum products”.
This Standard was first-time published in 1984.