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SY 5318-91, Petroleum and Natural Gas Industry Standard of the People's Republic of China
200-J Pressure Gauge
1991-07-19 Issued
Ministry of Energy of the People's Republic of China
1991-11-01 Implementation
1 Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China 200-J Pressure Gauge
SY 5318-91
Replaces SY 5318-88
This standard specifies the technical requirements, test methods, inspection regulations, and packaging, marking, transportation, and storage requirements for 200-J pressure gauges.
This standard applies to the manufacture and inspection of 200-J pressure gauges. 2 Reference Standards
SY5137 General Technical Conditions for Packaging of Downhole Instruments for Petroleum Exploration and Development ZBY002 Transportation of Instruments and Meters. Basic storage environment conditions and test methods GB1.3 Standardization work guide Product standard writing regulations 3 Product specifications
Products are divided into: 11, 19, 32, 44, 62, 95, 140MPa according to the maximum range. 4 Technical requirements
4.1 Maximum working temperature
See Table 1.
Product specifications MPa
Maximum working temperature ~
4.2 Nonlinear error
<±0.25%.
4.3 Repeatability error
Piston working stability
In the range of 20-80% of the maximum stroke of the piston, the force recovery curve does not have a peak value greater than 0.1mm sawtooth or step. 5 Test method
5.1 Test equipment
a, piston pressure gauge: basic error ±0.05%; b. Oil bath or air bath device: The upper limit temperature is higher than the maximum working temperature of the product by more than 10℃, and the temperature error is not more than 5℃. Effective depth>1.5m
5.2 Check the stability of piston working at room temperature
Use a dial indicator with a stroke of ≥100mm to check. When the piston is pumped out steadily and slowly, the dial indicator pointer should rotate evenly in the 20-80% range of the active stroke, without continuous jumping. Approved by the Ministry of Energy of the People's Republic of China on July 19, 1991 and implemented on November 1, 1991
5.3 High temperature pressure test
SY 5318-91
5.3.1 Precautions for high temperature pressure test
a. Before heating, the air in the test joint must be exhausted to prevent explosion accidents; b. The heating rate should be maintained at 0.5-1℃/min, and the heating time should be no less than 40min; c. If the pressure exceeds the test point, the pressure should be quickly reduced to 1/2 of the distance between the previous test point and the test point, and then increased to the test pressure. When making the high-temperature pressure test diagram, the recording step must have a horizontal line of not less than 0.5mm. 5.3.2 Test points, pressure values and test temperatures are shown in Table 2. 5.3.3 Test equations, nonlinear errors, and repeatability error calculation formulas are shown in Appendix A (Supplement). 5.4 High-temperature working stability test of pistons This test is carried out after the test in 5.3.2 is completed. 5.4.1 Pressure recovery curve diagram See Figure 1.
Test pressure line
5.4.2 Drawing method
aA-B is the rising section, the pressure is increased by the pressure pump, and the pressure at point B is controlled at 20-50% of the full range; b. B-C is the temperature rising section, and the pressure at point C should reach 60-80% of the full range. Note: When making the pressure recovery curve, the recording assembly is driven by the 24h timer, that is, the recorded card stroke is ≥66mm/h. 5.4.3 Inspection
SY 5318-91
On SD2A or other card readers with the same performance, check the smoothness of the pressure recovery curve B-C, which should meet the requirements of Article 4.4. Table 2
Test point
Specification Test temperature
Inspection rules
The product shall be inspected by the technical inspection department of the manufacturer. Manufacturing! It shall ensure that each batch of products shipped meets the requirements of Articles 4.1 to 4.4 and is tested according to the test methods of Articles 5.2 and 5.4. A quality certificate shall be attached when the product is shipped. 6.2 Products that do not meet the requirements of Articles 4.1 to 4.4 can be returned for repair, but must be retested according to the test methods of Articles 5.2 and 5.4. Marking, packaging, transportation, storage
7.1 Marking
a. Manufacturer;
b. Product factory number;
Write the product specifications in the appropriate position of the instrument box, and affix the trademark. 7.2 Packaging
7.2.1 Timer, recording tube, thermometer, the above three pieces are packed and placed in the specified position of the instrument box. 7.2.2
Other spare accessories are packed in plastic bags, with specifications and names written, and placed in the instrument box. The technical documents shipped with the product include: a.
1 packing list:
1 product quality certificate:
c product instruction manual:
d. Test table in triplicate.
SY 531891
7.2.4 Product packaging shall comply with the provisions of SY5137 when leaving the factory. 7.3 Storage
The product shall be stored in a room without corrosive gas, ventilated and dry, and inspected regularly (once every 12 months), mainly checking the working stability of the piston according to technical requirements 4.4 and test force method 5.2, 5.4, and secondly checking the appearance quality of the instrument. 7.4 Transportation
The instrument shall meet the requirements of ZBY002 under the conditions of transportation packaging. 4
Test equation
Where:
SY 5318—91
Appendix A
Test equation, nonlinear error, repeatability error calculation formula (supplement)
MZ ED-N D
(ED) 2-N.ZD
A-ED pD-ED*.Ze
(Ed)-N.ED
Theoretical test pressure, MPa;
Test displacement, mm;
-Pressure and displacement slope, MPa/mm;
Tangent intercept at pressure axis, MPa;
N test points.
Where A is a constant and does not change with temperature, and slope M changes with temperature. Therefore, for each test temperature, the corresponding slope must be calculated. First, calculate M (i.e., the slope of the first test temperature) according to the above formula, and the other slopes (MzM, M\·) can be obtained according to the following formula:
Wherein:
M2M, M4 are the slopes of the 2nd to 4th test temperatures respectively: D, DD, D, are the average displacements of the i-th point at the 1st to 4th calibration temperatures respectively. The temperature coefficient between each test temperature is calculated as follows: M,-M,
wherein: α)-
temperature coefficient from the first test temperature to the second test temperature; (4)
SY 531891
temperature coefficient from the second test temperature to the third test temperature; temperature coefficient from the third test temperature to the fourth test temperature, A2 nonlinear error
wherein:
max×100%www.bzxz.net
full scale test pressure;
difference between theoretical test pressure and measured pressure; P=MDi± A
A3 repeatability error
wherein:
× 100%
-Displacement value of a certain point at the first test temperature:
D,-Average displacement value of a certain point at the first test temperature: D
Additional instructions:
First test temperature, average displacement value of full scale. This standard is proposed and coordinated by the Petroleum Instrument and Meter Professional Standardization Committee. This standard is drafted by the Instrument Factory of Jianghan Oil Administration Bureau. The main drafter of this standard is Yan Baosheng.
This standard is equivalent to the deviation measurement reading guide of 200-J pressure gauge of Johnston Company of the United States. (10)
This standard replaces the original SY5318--88 "Technical Standard for 200-J Pressure Gauge" from the date of publication. SY5318-88 standard is abolished at the same time.
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