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GB/T 38599-2020 (GBT 38599-2020)

Chinese Standard: 'GB/T 38599-2020'
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GB/T 38599-2020English189 Add to Cart Days<=3 Safety valves and bursting disc safety devices in combination GB/T 38599-2020 Valid GB/T 38599-2020
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BASIC DATA
Standard ID GB/T 38599-2020 (GB/T38599-2020)
Description (Translated English) Safety valves and bursting disc safety devices in combination
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J19
Classification of International Standard 21.120.20
Word Count Estimation 10,115
Date of Issue 2020-03-31
Date of Implementation 2020-10-01
Drafting Organization Shanghai Huali Safety Equipment Co., Ltd., Dalian Polytechnic Safety Equipment Co., Ltd., Yingqiao Machinery Manufacturing Co., Ltd., Xuzhou Bafang Safety Equipment Co., Ltd., Asmi Valve Co., Ltd., Henan Boiler and Pressure Vessel Safety Testing Research Institute, Shenyang Market Supervision Affairs Service and Administrative Law Enforcement Center (Shenyang Inspection and Testing Center), Zhejiang Pump and Valve Product Quality Inspection Center, Shanghai Special Equipment Supervision and Inspection Technology Research Institute
Administrative Organization National Technical Committee for Standardization of Safety Pressure Relief Devices (SAC/TC 503)
Regulation (derived from) National Standards Announcement No. 4 of 2020
Proposing organization China Machinery Industry Federation
Issuing agency(ies) State Administration for Market Regulation, Standardization Administration of China

GB/T 38599-2020
Safety valves and bursting disc safety devices in combination
ICS 13.240
J16
National Standards of People's Republic of China
Combination of safety valve and bursting disc safety device
2020-03-31 released
2020-10-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Application and Design 1
5 Installation 2
6 Determination of displacement correction factor 3
6.1 Test requirements 3
6.2 Test device 3
6.3 Test method 3
6.4 Test Step 3
6.5 Qualification judgment 4
6.6 Calculation of displacement correction factor 4
6.7 Certification of displacement correction factor 4
6.8 Other methods for determining displacement correction factor 5
7 Application of displacement correction factor 5
8 Logo 5
8.1 Bursting disc safety device 5
8.2 Safety valve 5
8.3 Combination device 5
9 Quality certificate 5
10 Packaging and transportation 6
Reference 7
Combination of safety valve and bursting disc safety device
1 Scope
This standard specifies the application and design, installation, and displacement correction of the combination of safety valve and bursting disc safety device (hereinafter referred to as the combined device)
Determination of coefficients, application of displacement correction coefficients, labeling, quality certificates, packaging and transportation.
This standard applies to the series combination structure where the distance from the outlet side of the rupture disc safety device to the inlet side of the safety valve is not greater than 5 times the pipe diameter.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 567.1 Bursting Disc Safety Device Part 1.Basic Requirements
GB/T 567.2 Bursting Disc Safety Device Part 2.Application, Selection and Installation
GB/T 12241 General requirements for safety valves (GB/T 12241-2005, ISO 4126-1.1991, MOD)
GB/T 12242 Specification for performance test of pressure release device
GB/T 12243 spring direct load safety valve
3 Terms and definitions
The following terms and definitions defined in GB/T 567.1, GB/T 567.2 and GB/T 12241 apply to this document.
3.1
Combination device
The bursting disc safety device is installed in 5 times the pipe diameter on the inlet side of the safety valve (from the outlet side of the bursting disc holder to the inlet side of the safety valve)
A kind of safety relief device.
3.2
Combined device displacement coefficient
Kd
The ratio of the measured actual emissions of the combined device to the theoretical calculated emissions.
3.3
Combination device displacement correction factor
Fd
The coefficient used to modify the emission capacity of the combined device.
4 Application and design
4.1 The combined device is used to prevent overpressure in pressure vessels, pipelines and other closed vessels, and is mainly used for the following purposes.
a) Prevent the safety valve from corrosion, fouling, or other working conditions that affect the performance of the safety valve;
b) Prevent leakage of safety valve;
c) Prevent material loss after the bursting disc blasts.
4.2 The discharge capacity of the combined device should be such that the pressure of the protected equipment does not exceed the allowable limit pressure specified in the corresponding standard.
4.3 The safety valve should meet the requirements of GB/T 12241.
4.4 The rupture disc safety device shall meet the requirements of GB/T 567.1.
4.5 The maximum burst pressure of the bursting disc safety device should not be greater than 110% of the set pressure of the safety valve or 0.01 MPa (whichever is greater)
Maximum value), the minimum burst pressure should not be less than 90% of the set pressure of the safety valve. The designer should determine according to the design pressure of the protected system
Set the design burst pressure of the bursting disc safety device.
4.6 The minimum net discharge area of the bursting disc in the combined device should be greater than the flow channel area of the safety valve.
4.7 Bursting discs should not be made of brittle materials, and the bursting discs should not produce fragments or falling off when ruptured.
4.8 When the combined device is used in a liquid medium, the manufacturer shall determine the type of bursting disc safety device and safety valve.
4.9 The cavity between the bursting disc safety device and the safety valve should be provided with an exhaust valve, pressure gauge or other alarm indicator to indicate the bursting disc
Whether it leaks or ruptures, and discharge the pressure accumulated in the cavity in time to avoid back pressure affecting the burst pressure of the rupture disc.
4.10 The combined device shall be calibrated with its displacement correction factor Fd through tests or other methods.
5 Installation
5.1 The installation diagram of the combined device is shown in Figure 1.
5.2 The connecting pipeline between the protected equipment and the inlet side of the safety valve should ensure that the pressure drop of the medium leading to the inlet side of the safety valve (including
The impact of the resistance of the bursting disc safety device) When the safety valve reaches the maximum discharge pressure state, it does not exceed 3% of the set pressure of the safety valve.
5.3 The combined device should be safe when it is discharged. According to the nature of the medium, it can be discharged indoors (pay attention to the position and direction) or guided
To discharge to a safe place, there should not be any obstacles in the discharge pipeline that restrict or affect the discharge of the medium.
5.4 The manufacturer of the combined device shall provide the installation instructions for the combined device.
6 Determination of displacement correction factor
6.1 Test requirements
6.1.1 When the combined device is used for compressible fluids, the test should use superheated steam, air with a superheat of not more than 10℃, or other properties with known characteristics.
He can compress fluids.
6.1.2 When the combined device is used for liquid, the test medium is water or other liquids with known characteristics.
6.1.3 The safety valve with the largest flow channel area under this model and specification should be used for testing.
6.1.4 The bursting disc safety device with the minimum burst pressure of this model and specification shall be used for testing.
6.1.5 The measured displacement correction coefficient is applicable to the combined device with the same design as the test, but the external shape of the holder may not be considered.
6.2 Test device
The test device should meet the requirements of GB/T 12242.
6.3 Test method
6.3.1 Single specification method
The requirements of the single specification method are as follows.
a) Suitable for testing combined devices of specific design (specification and model determination);
b) Select three rupture discs with the same design burst pressure to test the combined device separately according to the steps in 6.4;
c) The test results obtained by the above test methods can be used in the three-standard method.
6.3.2 Three-Specification Method
The requirements of the three-standard method are as follows.
a) It is used to test combination devices that need to be serialized and mass-produced. The Fd value measured by this method can cover the entire range of products
(Including different specifications and different pressures);
b) Combination devices of three continuous specifications should be tested;
c) For each of the three types of rupture disc safety devices, take three rupture discs with the same design burst pressure and follow the steps in 6.4.
The combined device was tested (9 pieces in total). It is permissible to test each rupture disc with the same pair of holders.
6.4 Test procedure
6.4.1 According to the relevant requirements of GB/T 12242, in the absence of a bursting disc safety device, conduct a test to determine the displacement of a separate safety valve
coefficient.
6.4.2 Install the bursting disc safety device on the inlet side of the safety valve, blast the bursting disc according to the requirements of 6.4.3, and then make the safety valve
action.
6.4.3 The combined device shall be tested according to the following steps.
a) Install the combined device on the test device, increase the pressure on the inlet side to 90% of the expected minimum burst pressure, and keep the pressure no less than
5s, then increase the pressure steadily and continuously. When the pressure is increased, the minimum indication of the pressure gauge should be accurately read until the bursting disc bursts.
And correctly record the burst pressure;
b) The discharge volume of the combined device should be measured at a pressure exceeding the setting pressure of the safety valve by 10% or 0.01MPa (whichever is greater)
Test, when the flow rate, temperature and pressure reach a stable, record the corresponding data;
c) The ratio of the measured discharge volume of the combined device to the theoretical flow rate is the combined device displacement coefficient Kd;
d) Repeat a), b), and c) using burst disc safety devices of the same specification.
6.5 Qualification judgment
6.5.1 General requirements
Only when the requirements of 6.5.2~6.5.4 are met, can the combined device displacement correction coefficient determined by the test be recognized.
6.5.2 Requirements for safety valves
The displacement coefficient obtained by the test of the individual safety valve shall not be less than its rated displacement coefficient.
6.5.3 Requirements for rupture disc safety devices
6.5.3.1 The burst pressure of the bursting disc during the test shall be within the allowable burst pressure range.
6.5.3.2 When the burst pressure of any bursting disc is inconsistent with 6.5.3.1, the following conditions shall be met.
a) If the burst pressure of only one bursting disc in a batch does not meet the requirements of 6.5.3.1, the same batch can be selected additionally
The second two bursting discs are used for the burst test test, and the test results of the two bursting discs are used to replace the unqualified one;
b) If a batch of bursting discs exceeds the bursting pressure of one bursting disc (including any alternative test bursting discs), the burst pressure is not met
According to the requirements of 6.5.3.1, this batch of rupture discs shall be judged as unqualified, and different batches of rupture discs shall be retested according to the steps in 6.4.
6.5.4 Requirements for combined devices
6.5.4.1 Single specification method combined device
The deviation of the obtained Kd value should not exceed ±5% of the arithmetic mean of all its measured values.
6.5.4.2 Three-size method combination device
The deviation of Kd value of each model and specification combination device should not exceed ±5% of the arithmetic mean value measured for that type and specification.
The deviation of the Kd value of the three continuous specification combination devices should also not exceed ±5% of the arithmetic mean value measured by the three types and specifications.
6.5.4.3 Other requirements
Other requirements are as follows.
a) If the deviation of the Kd value of the combined device exceeds ±5% of the arithmetic mean, the test result is unqualified and meets b) and c)
except.
b) Under the conditions of 6.5.4.2, if the deviation of only one test result exceeds ±5% of its arithmetic mean, the same batch can be selected
The second rupture disc is subjected to two additional tests, the Kd value obtained from these two tests is used to replace the unqualified result and the new flat is calculated.
Average Kd value.
c) The Kd value obtained (excluding unqualified test results), including the replacement test of b), shall be within ±5% of the new arithmetic mean
If the burst pressure of the replacement bursting disc is consistent with 6.5.3.2, the result obtained by the batch combination device can be judged as qualified.
6.6 Calculation of displacement correction factor
6.6.1 Combined device displacement correction coefficient The average value of the displacement coefficient determined by the combined device test and the single safety valve displacement coefficient for the test
To determine the ratio.
6.6.2 When the Fd value is greater than 1, Fd=1 should be adopted. When the Fd value is less than 0.97, unless there are special considerations, this Fd cannot be used.
6.7 Certification of displacement correction factor
6.7.1 Only meet the requirements of 6.1~6.6, the test result can be recognized and the certified Fd value can be given.
6.7.2 The certified displacement correction coefficient shall be the average value of the combined device displacement correction coefficient obtained from the test, and shall not be greater than 1.0.
6.8 Other methods for determining displacement correction coefficient
The default value of 0.9 is allowed to be used as the displacement correction coefficient of the combined device, but the pressure drop and the safety valve should be recalculated based on this value.
Reaction force during discharge.
7 Application of displacement correction factor
7.1 The combined device displacement correction factor multiplied by the safety valve rated discharge volume is the combined device rated discharge volume.
7.2 The displacement correction coefficient of the combined device can be used to determine the discharge area of the combined device (the size of the corresponding safety valve or bursting disc safety device).
7.3 The Fd value obtained by the single specification method is applicable to the safety valve and bursting disc safety device combination device with the same design as the test.
7.4 The Fd value obtained by the three-specification method is applicable to all the minimum blasting that is not less than the minimum specification during the test and the burst pressure is not less than that specification
Pressure combination device.
7.5 Under subcritical conditions, a single specification method should be used to determine the Fd value.
Note. Refer to GB/T 36588 for the judgment of critical and subcritical flows.
8 Identification
8.1 Bursting disc safety device
The nameplate markings of rupture discs, holders and auxiliary components shall meet the requirements of GB/T 567.1.
8.2 Safety valve
The nameplate mark of the safety valve should meet the requirements of GB/T 12243.
8.3 Combination device
The combined device shall be marked on the nameplate as follows.
a) Product serial number;
b) Manufacturing unit;
c) Manufacturing standards;
d) Displacement correction factor Fd of combined device;
e) Nominal size (DN or NPS);
f) Date of manufacture.
9 Quality certificate
When providing a combined device, a quality certificate with at least the following contents is required at the same time.
a) rupture disc safety device manufacturer;
b) Safety valve manufacturer;
c) The nominal size of the combined device (DN or NPS);
d) The maximum burst pressure (MPa) and minimum burst pressure (MPa) at the design temperature, or the design burst pressure at the design temperature and
Tolerance;
e) The set pressure of the safety valve (MPa);
f) Displacement correction factor Fd of combined device;
g) The flow channel area of the safety valve (mm2);
h) The minimum net discharge area of the rupture disc (cm2);
i) The minimum rise value of the safety valve (mm) and the corresponding overpressure (expressed in percentage);
j) Safety valve rated displacement coefficient, and indicate the corresponding fluid medium;
k) Manufacturing standards;
l) Date of manufacture;
m) The product serial number of the combined device.
10 Packaging and transportation
The combined device should be packaged to avoid any damage and ensure that its performance is not affected during transportation.
Related standard: GB/T 12234-2019    GB/T 38202-2019
Related PDF sample: GB/T 30832-2014    GB/T 29026-2012