This standard specifies the method for measuring the pressure resistance, deformation and bursting pressure of hoses under pressure. This standard applies to hoses with an inner diameter of φ2~φ51mm (including hose assemblies) and does not apply to hoses of special shapes. GB/T 5563-1994 Hydraulic test methods for rubber and plastic hoses and hose assemblies GB/T5563-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber and plastics hoses and hose assemblies
Hydrostatic test method
Rubber and plastics hoses and hose assemblies-Hydrostatle testlng
GB/T 5563-94
Generation GB5563-85
This standard adopts the international standard ISO/DIS1402-1991 Rubber, plastics hoses and hose assemblies-1 Subject content and applicable scope-Hydrostatic test.
This standard specifies the method for determining the pressure resistance, tube deformation and bursting pressure of hoses under pressurized conditions. This standard is applicable to hoses (including hose assemblies) with an inner diameter of p2 to 51 mm, and is not applicable to hoses of special shapes. 2 Reference standards
GB2941 Standard temperature, temperature and time for environmental conditioning and testing of rubber specimens GB/T9573 Dimensional measurement methods for rubber, plastic hoses and hose assemblies GB 9574 Ratio of test pressure and burst pressure to design working pressure of rubber, plastic hoses and hose assemblies 3 General requirements
Unless otherwise specified, all tests should be carried out at standard laboratory temperature (see GB2941) 4 Instruments and equipment
4.1 Pressure gauge: A calibrated 1.5-level pressure gauge should be selected for each test, and the test pressure should be between 15% and 85% of the full-scale pressure reading.
4.2 Vernier caliper, tape measure.
5 Test specimens
The minimum free length of the hose specimen is 600mm. For hose assemblies, unless otherwise specified, the finished length should be used for testing. The number of specimens shall not be less than two.
6 Pressurization
6.1 General requirements
Water or other liquid suitable for hose testing shall be used as the test medium during the test. All gases shall be removed from the specimen. 6.2 Procedure
6.2.1 Fill the hose with the test liquid and expel all air. At the same time, connect the test equipment, close the door, and increase the pressure at the specified rate. Use a pressure gauge (4.1) to measure the pressure. During the test, the free end of the specimen shall not be restricted in any way. 6.2.2 Rate of pressure increase
a. For hoses with bursting pressure less than or equal to 12.5 MPa, the pressure increase rate is 0.075~0.175 MPa/s. Approved by Guohao Technical Supervision on January 2, 1994 and implemented on October 1, 1994.
GB/T 5563-94
b. For hoses with bursting pressure between 12.5 and 40 MPa, the pressure increase rate is 0.35~1.17 MPa/s. If the test pressure is greater than 40 MPa, a higher constant pressure increase rate should be used so as to reach the final test pressure within 120.
d. If these pressure increase rates cannot be achieved, a suitable pressure increase rate can be determined by consultation between the commissioned test unit and the test unit. 7 Hydraulic test station for low and medium pressure hoses
7.1 Static pressure test
When the performance of hoses (including hose assemblies) is determined by static pressure test, the test pressure shall be applied according to the provisions of 6.2.2, and the pressure shall be maintained for more than 308 and less than 608 hours. During this period, check whether the sample has leakage, cracking, blistering, twisting and other abnormal phenomena. Except for hoses with special provisions, the relationship between the test pressure and the design working pressure shall comply with the pressure ratio listed in GB9574. 7.2 Determination of pipe deformation value
7.2.1 General procedure
When determining the change in length, change in outer diameter and change in twist of the hose, the hose shall be placed horizontally, and a static hydraulic pressure of 0.07 MPa shall be applied to straighten it. Three reference marks A, B and C shall be drawn on the outer surface of the hose. Mark B is located near the middle of the full length of the hose, and marks A and C are on both sides of B 250 mm away. Each mark should be an arc on the hose circle. Draw a generatrix along the outer surface of the hose. The generatrix should be perpendicular to the three arcs (see Figure 1).
Figure 1 Dimensional stability determination
At an initial pressure of 0.07 MPa, make relevant measurements at the reference mark (see 7.2.2, 7.2.3, and 7.2.4). Increase the pressure to the specified test pressure at the rate specified in 6.2.2. After maintaining the pressure for 1 min, complete the measurement as quickly as possible to avoid prolonging the test time. 7.2.2. Length change
Use a tape measure to measure the length L and L1 between the two outermost reference marks A and C at the initial pressure and the test pressure respectively, with an accuracy of 1 mm.
The length change rate △L is expressed as a fraction of the initial length and is calculated according to formula (1): Li - Lo
Wherein, L. - the distance between the two outermost reference marks measured at the initial pressure, mm; the distance between the two outermost reference marks measured at the specified test pressure, m, L
7.2.3 Change in outer diameter
The change in outer diameter can be measured by measuring the circumference with a ruler, accurate to 1 mm; it can also be measured directly with a vernier caliper. Fish circumference length change method
GB/T 5563-94
Use a tape measure (4.2) to measure the circumference of each of the three reference marks (A, B and C) at the initial pressure (0.07MPa) and the specified test pressure.
The outer diameter change rate AC is expressed as a percentage of the initial diameter. Calculated according to formula (2), ZCi - EC.
Where: C—the sum of the circumferences of the three reference marks measured at the initial pressure, mm; EC,
—the sum of the circumferences of the three reference marks measured at the specified test pressure, mm. b. Direct measurement method
Use a vernier caliper to measure two outer diameters vertically at every three reference marks at the initial pressure and the specified test pressure respectively. The outer diameter change rate AD is expressed as a percentage of the initial diameter and is calculated according to formula (3): ZD,- EDe × 100
Where: ZD—the sum of the six outer diameters measured at the reference marks at the initial pressure, mm; ZDi—the sum of the six outer diameters measured at the reference marks at the specified test pressure, mm. In case of dispute, method b shall prevail.
7.2.4 Torsion
When the hose is under pressure, if it is twisted, the initial straight line connected by the reference marks will be spiral (see Figure 2). B
Figure 2 Determination of torsion
(2)
Under the specified test pressure, draw a straight line along the direction of the hose generatrix at mark A and intersect the circle at mark C at C, then use a tape measure to measure the length S of circle Cc, accurate to 1mm. The torsion T of each meter of hose is expressed in degrees per meter. Calculate according to formula (4): 0
Where: --cc is the length, mm
c——the circumference of the circle at reference mark C, mmL——the distance between reference marks AC, mm.
7.2.5 Twist
Twist refers to the maximum deviation of a part of the hose from the line connecting the centers of the two pipe joints under the test pressure and the initial pressure (0.07MPa). During the test, a taut cord can be used to determine the line connecting the centers of the two pipe joints. The torsion is expressed as the distance from the maximum deviation point to the line; the test result is accurate to 5mm. 7.3 Burst pressure test
GB/T 5563—94
Increase the pressure at the pressure increase rate specified in 6.2.2 until the specified minimum burst pressure is reached or the hose is broken. If the pressure is interrupted during the test, the sample shall be scrapped.
Record the test pressure. www.bzxz.net
8 Hydraulic test of high-pressure and ultra-high-pressure hoses
8.1 Static pressure test
Perform in accordance with 7.1.
8.2 Deformation value determination of pipe body
Perform in accordance with 7.2.
8.3 Burst pressure test
Choose an appropriate pressure increase rate and pressurize the hose to the specified burst pressure in less than 60 seconds until the hose bursts. If the test pressure is interrupted before the hose bursts, the sample shall be reported. Record the test pressure.
8.4 Leakage test
B.4.1 Specimen
The specimen shall be a hose assembly that has been crimped for not less than 1 day and not more than 30 days. 8. 4.2 Procedure
Subject the specimen to a hydrostatic pressure equivalent to 70% of the specified minimum burst pressure, maintain for 5±0.5 minutes, and then reduce to zero. Then increase to the specified test pressure, maintain for 5±0.5 minutes, and check the specimen. No leakage or other abnormal conditions shall occur. This test is considered a destructive test, and the specimen shall be scrapped after the test.
9 Test failure criteria
When the hose assembly is subjected to a burst test, the pipe joint is pulled off or is 25.The burst within mm shall not be regarded as the burst of the hose and shall be recorded in the test report.
When the hose is subjected to the burst test, if the damage occurs within 25mm from the end joint or within the distance equivalent to the outer diameter of the hose, in either case, the test shall be repeated.
10 Test Report
The test report for each test conducted shall include the following: a.
Test method adopted.
Number of test specimens and length of test specimens.
Test pressure and pressure increase rate.
Test medium (except water).
Test results obtained for each specimen in each test. If the specimen is damaged, record the location and type of damage. Abnormal conditions during the test.
Tester.
Verifier.
Test date.
Additional Notes
This standard is sponsored by the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by Shenyang Fourth Rubber Technology Co., Ltd. The main drafters of this standard are Tuo Rui, Miao Suxia, Yu Kaihui, Lv Heren and Wang Wei.
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