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GB/T 38599-2020: PDF in English (GBT 38599-2020)
GB/T 38599-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.040
J 16
Safety valves and bursting disc safety devices in combination
(ISO 4126-3:2006, Safety devices for protection against excessive pressure -
Part 3: Safety valves and bursting disc safety devices in combination, MOD)
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: OCTOBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions... 5 
4 Application and design ... 6 
5 Installation ... 7 
6 Determination of adjusted factor of discharge capacity ... 8 
6.1 Test requirements ... 8 
6.2 Test device ... 8 
6.3 Test methods ... 8 
6.4 Test steps ... 9 
6.5 Acceptance determination ... 9 
6.6 Calculation of adjusted factor of discharge capacity ... 11 
6.7 Certification of adjusted factor of discharge capacity ... 11 
6.8 Other methods to determine adjusted factor of discharge capacity ... 11 
7 Application of adjusted factor of discharge capacity ... 11 
8 Marks ... 12 
8.1 Bursting disc safety device ... 12 
8.2 Safety valve ... 12 
8.3 Combination device ... 12 
9 Quality certificate ... 12 
10 Packaging and transportation ... 13 
Bibliography... 14 
Safety valves and bursting disc safety devices in combination
1 Scope
This Standard specifies the application and design, installation, determination of
adjusted factor of discharge capacity, application of adjusted factor of discharge
capacity, identification, quality certificate, packaging and transportation of the
combination of safety valve and bursting disc safety device (hereinafter referred to as
the combination device).
This Standard applies to the series combination structure where the distance from the
outlet side of the bursting disc safety device to the inlet side of the safety valve is not
more than 5 times the pipe diameter.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 567.1, Bursting disc safety devices - Part 1: Basic requirement
GB/T 567.2, Bursting disc safety devices - Part 2: Application, selection and
installation
GB/T 12241, Safety valves - General requirements (GB/T 12241-2005, ISO 4126-
1:1991, MOD)
GB/T 12242, Pressure relief devices - Performance test code
GB/T 12243, Spring loaded safety valves
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 567.1,
GB/T 567.2 and GB/T 12241 as well as the followings apply.
3.1 combination device
A bursting disc safety device is a safety relief device installed in 5 pipe diameters 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).
3.2 combination device discharge capacity factor; Kd
The ratio of the measured actual emissions of the combination device to the
theoretically calculated emissions.
3.3 adjusted factor of combination device discharge capacity; Fd
The factor used to correct the discharge capacity of the combination device.
4 Application and design
4.1 The combination device is used to prevent overpressure of pressure vessels,
pipelines and other closed vessels, mainly for the following purposes:
a) Prevent safety valve corrosion, scaling, or other conditions that affect safety valve
performance;
b) Prevent safety valve leakage;
c) Prevent material loss after the bursting disc is blasted.
4.2 The discharge capacity of the combination device shall 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 shall meet the requirements of GB/T 12241.
4.4 The bursting disc safety device shall meet the requirements of GB/T 567.1.
4.5 The maximum burst pressure of the bursting disc safety device shall not be greater
than 110% of the set pressure of the safety valve or 0.01MPa (whichever is the larger
value between the two). The minimum burst pressure shall not be less than 90% of the
set pressure of the safety valve. The designer shall determine the design burst pressure
of the bursting disc safety device according to the design pressure of the protected
system.
4.6 The minimum net relief area of the bursting disc in the combination device shall be
larger than the flow passage area of the safety valve.
4.7 Bursting discs shall not be made of brittle materials. The bursting disc shall not
produce fragments or fall off when it bursts.
4.8 When the combination device is used for liquid medium, the type of bursting disc
safety device and safety valve shall be determined by the manufacturer.
4.9 The cavity between the bursting disc safety device and the safety valve shall be
provided with an exhaust valve, a pressure gauge or other alarm indicators. It is used to
6 Determination of adjusted factor of discharge capacity
6.1 Test requirements
6.1.1 When the combination device is used for compressible fluids, the test shall use
superheated steam, air or other compressible fluids with known properties whose
superheat degree is not more than 10°C.
6.1.2 When the combination device is used for liquids, the test medium is water or other
liquids of known properties.
6.1.3 It shall use the safety valve with the largest flow area for that model and size to
test.
6.1.4 It shall use the bursting disc safety device with the minimum burst pressure of this
model and size to test.
6.1.5 The measured adjusted factor of discharge capacity applies to the combination
device of the same design as tested. However, the external shape of the holder may be
disregarded.
6.2 Test device
The test device shall meet the requirements of GB/T 12242.
6.3 Test methods
6.3.1 Single specification method
The single specification method requires the following:
a) It is used to test the combination device of specific design (specification and model
are known);
b) Select three bursting discs with the same design bursting pressure to test the
combination 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-
specification method.
6.3.2 Three-specification method
The three-specification method requires the following:
a) It is used to test the combination device that requires serialized mass production.
The Fd value measured by this method can cover the entire type of product range
(including different specifications, different pressures);
b) It shall test the combination device of three consecutive specifications;
c) For each of the three specifications of bursting disc safety devices, take three
bursting discs with the same design bursting pressure to test the combination
device according to the steps in 6.4 (9 pieces in total). The same pair of grippers
are allowed to be tested for each size of bursting disc.
6.4 Test steps
6.4.1 According to the relevant requirements of GB/T 12242, in the absence of a
bursting disc safety device, conduct tests to determine the discharge capacity factor of
the individual safety valve.
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. Then actuate the safety valve.
6.4.3 The combination device shall be tested as follows:
a) Mount the combination device on the test device. The pressure on the inlet side is
increased to 90% of the expected minimum burst pressure. Hold the pressure not
less than 5s. After that, boost the pressure steadily and continuously. When
boosting pressure, it shall be able to accurately read the minimum indication value
of the pressure gauge until the bursting disc bursts. Correctly record the burst
pressure;
b) The discharge capacity of the combination device shall be tested when it exceeds
the set pressure of the safety valve by 10% or 0.01MPa (whichever is the larger
value between the two). When the flow rate, temperature and pressure are stable,
record the corresponding data;
c) The ratio of the measured discharge of the combination device to the theoretical
flow rate is combination device discharge capacity factor Kd;
d) Use the bursting disc safety device of the same specification to repeat a), b), and
c).
6.5 Acceptance determination
6.5.1 General requirements
Only the combination device discharge capacity factor that meets the requirements of
6.5.2~6.5.4 and passes the test can be accepted.
tests. Calculate a new average Kd value.
c) When the obtained Kd value (excluding the rejected test results), including the
replacement test for b), is within ±5% of the new arithmetic mean, and the burst
pressure of the replacement bursting disc is consistent with 6.5.3.2, then the
results obtained from this batch of combination devices can be determined as
acceptable.
6.6 Calculation of adjusted factor of discharge capacity
6.6.1 The adjusted factor of combination device discharge capacity is determined by
the ratio of the average value of the discharge capacity factor determined by the
combination device test to the discharge capacity factor of the single safety valve used
in the test.
6.6.2 When the Fd value is greater than 1, Fd=1 shall be used. When the Fd value is less
than 0.97, this Fd cannot be used unless there are special considerations.
6.7 Certification of adjusted factor of discharge capacity
6.7.1 Only if the requirements of 6.1~6.6 are met, the test results can be accepted and
the certified Fd value can be given.
6.7.2 The certified adjusted factor of discharge capacity shall be the average value of
the adjusted factors of combination device discharge capacity obtained by the test and
shall not be greater than 1.0.
6.8 Other methods to determine adjusted factor of discharge capacity
A default value of 0.9 is allowed as the adjusted factor of combination device discharge
capacity. However, the pressure drop of the safety valve and the reaction force during
discharge shall be recalculated according to this value.
7 Application of adjusted factor of discharge capacity
7.1 The adjusted factor of combination device discharge capacity multiplied by the rated
discharge capacity of the safety valve is the rated discharge capacity of the combination
device.
7.2 The adjusted factor of combination device discharge capacity can be used to
determine the combination device discharge area (corresponding to the size of the safety
valve or bursting disc safety device).
7.3 The Fd value obtained by the single specification method is applicable to the
combination of safety valve and bursting disc safety device with the same design as the
test.
7.4 The Fd value obtained by the three-specification method is applicable to all
combination devices not less than the minimum size at the time of testing and the burst
pressure is not less than the minimum burst pressure of the specification.
7.5 Under subcritical conditions, the single specification method shall be used to
determine the Fd value.
NOTE: For the determination of critical and subcritical flow, see GB/T 36588.
8 Marks
8.1 Bursting disc safety device
The nameplate marks of bursting discs, holders and auxiliary components shall meet
the requirements of GB/T 567.1.
8.2 Safety valve
The nameplate marks of the safety valve shall meet the requirements of GB/T 12243.
8.3 Combination device
The combination device shall be marked on the nameplate according to the following
requirements:
a) Product serial number;
b) Manufacturer;
c) Manufacturing standard;
d) Adjusted factor of combination device discharge capacity Fd;
e) Nominal size (DN or NPS);
f) Date of manufacture.
9 Quality certificate
When providing a combination device, it is necessary to provide a quality certificate
with at least the following contents:
......

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 J16
Classification of International Standard 13.240
Word Count Estimation 10,182
Date of Issue 2020-03-31
Date of Implementation 2020-10-01
Quoted Standard GB/T 567.1; GB/T 567.2; GB/T 12241; GB/T 12242; GB/T 12243
Adopted Standard ISO 4126-3-2006, MOD
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., Asimi Valve Co., Ltd., Henan Province Boiler and Pressure Vessel Safety Inspection 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 Safety Pressure Relief Device Standardization Technical Committee (SAC/TC 503)
Proposing organization China Machinery Industry Federation
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration
Summary This standard specifies the application and design, installation, determination of displacement correction factor, application of displacement correction factor, identification, quality certificate, packaging and transportation of the combination of safety valve and bursting disc safety device (hereinafter referred to as combination device). This standard is applicable to the series combination structure where the distance from the outlet side of the bursting disc safety device to the population side of the safety valve is not more than 5 times the pipe diameter.