Some standard content:
Setting and Selection of Bursting Discs
HG/T 20570.3-95
Compiled by: China Huanqiu Chemical Engineering Corporation Approved by: Ministry of Chemical Industry
Effective Date: September 1, 1996 Prepared by:
China Huanqiu Chemical Engineering Corporation
Reviewed by:
Shang Changyou
China Huanqiu Chemical Engineering Corporation
Feng Shuyuan and Gong Renwei, Technology Center of Process System Design, Ministry of Chemical Industry
Scope of Application
1.0.1 This regulation applies to arched metal bursting discs and bursting disc devices for preventing overpressure in pressure vessels, pipelines or other confined spaces of petrochemical and chemical plants. The maximum bursting pressure of a bursting disc shall not exceed 35MPa. 63
2.0.1 Bursting disc device
A pressure relief safety device composed of a bursting disc (or bursting disc assembly) and a clamp (or support ring). When the pressure difference on both sides of the bursting disc reaches a predetermined value at a predetermined temperature, the bursting disc will immediately actuate (break or fall off) and release the pressure medium.
2.0.2 Bursting disc
In a bursting disc device, a pressure sensitive element that can be quickly actuated by overpressure is used to seal the pressure and control the bursting pressure.
2.0.3 Bursting disc assembly (also known as combined bursting disc) is a bursting disc composed of two or more parts such as a pressure sensitive element, a back pressure bracket, a reinforcement ring, and a protective film.
2.0.4 Positive arch type bursting disc
The pressure sensitive element is positive arch type. When installed, the concave surface of the arch is on the high pressure side of the pressure system. When actuated, the element undergoes tensile rupture.
2.0.4.1 Ordinary positive arch type bursting disc
Pressure sensitive element does not need other processing, and is directly formed from bad pieces. 2.0.4.2 Positive arch slit type bursting disc
Pressure sensitive element is a positive arch type bursting disc composed of an arched piece with a slit (hole) and a sealing membrane. 2.0.5 Reverse arch type bursting disc
The pressure sensitive element is in a reverse arch shape. During installation, the convex surface of the arch is on the high-pressure side of the pressure system. When the element is in operation, compression instability occurs, causing rupture or fall off. 2.0.5.1 Reverse arch with knife holder (or crocodile tooth) type bursting disc Reverse arch type bursting disc that ruptures due to contact with the knife edge (or crocodile tooth) when the pressure sensitive element is unstable and flips. 2.0.5.2 Reverse arch falling type bursting disc
Reverse arch type bursting disc that falls off along the support edge when the pressure sensitive element is unstable and flips, and rushes out with the high-pressure side medium.
2.0.6 Grooved Bursting Disc
Arched (positive or negative) bursting disc with weakening grooves engraved on the arch surface (convex or concave) of the pressure sensitive element. 2.0.7 Clamp
In the bursting disc device, it is a matching part with a designed discharge caliber to fix the position of the bursting disc and ensure the accurate action of the bursting disc 64
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2.0.8 Support
A ring that fixes the position of the negative arch fall-off bursting disc mechanically or by welding to ensure the accurate action of the bursting disc. 2.0.9 Back Pressure
The static pressure existing on the discharge side of the bursting disc device. If there are other pressure sources on the discharge side or there is a vacuum state on the inlet side, back pressure will be formed.
The difference between the pressure on the discharge side and the pressure on the inlet side is called the back pressure difference. 2.0.10 Back pressure bracket
In a combined bursting disc, an arched bracket is used to prevent accidental damage to the pressure sensitive element due to back pressure difference. This type of bracket needs to cooperate with the pressure sensitive element. The back pressure bracket with the arch opening (or seam) placed on the concave surface of the positive arch bursting disc prevents the convex surface of the bursting disc from being compressed and unstable when a back pressure difference occurs. When the system pressure may be vacuum, this type of back pressure bracket is sometimes called a vacuum bracket. The back pressure bracket placed on the convex surface of the reverse arch bursting disc prevents the concave surface of the bursting disc from being compressed and damaged when a back pressure difference occurs.
2.0.11 Reinforcement ring
In a combined bursting disc, a ring that is tightly combined with the edge of the pressure sensitive element to enhance the edge stiffness.
2.0.12 Sealing film
In a combined bursting disc, a film that seals the pressure sensitive element. 2.0.13 Protective film (layer)
When the pressure sensitive element is susceptible to corrosion, a covering film or coating (plating) layer used to prevent corrosion. 2.0.14 Bad piece
A metal piece punched out from a metal strip or sheet before being made into an arch-shaped bursting disc. 2.0.15 Burst pressure
When the bursting disc device is actuated at the corresponding bursting temperature, the pressure difference on both sides of the bursting disc. 2.0.15.1 Design burst pressure
The bursting pressure corresponding to the bursting temperature proposed by the purchaser when designing the bursting disc. 2.0.15.2 Maximum (minimum) design burst pressure The total algebraic sum of the design burst pressure plus the manufacturing range and the burst pressure tolerance. 2.0.15.3 Test burst pressure
The actual burst pressure measured by the bursting disc at the moment of bursting during the burst test. The test burst temperature should be measured at the same time as this burst pressure.
2.0.15.4 Calibrated burst pressure
The burst pressure that meets the design requirements after the burst test. When the burst test is qualified, its value is the arithmetic mean of the test burst pressures of the batch of bursting discs according to the specified sampling quantity. The calibrated burst pressure of the same batch of bursting discs must be within the agreed manufacturing range. When the agreed manufacturing range is zero, the calibrated burst pressure should be the design burst pressure. 2.0.16 Maximum working pressureWww.bzxZ.net
The maximum pressure that the top of the container may reach during normal operation of the container. See "Determination of Design Pressure and Design Temperature of Equipment and Piping Systems" (HG/T20570.1-95). 2.0.17 Maximum pressure
The pressure that may be reached at the top of the container after the maximum working pressure of the container is added to the additional conditions of the process working system in the process. See "Determination of design pressure and design temperature of equipment and piping systems" (HG/T20570.1-95). 2.0.18 Burst temperature
The temperature of the wall of the pressure sensitive element corresponding to the burst pressure. This term can be used with "design" or "test" as an attribute.
2.0.19 Manufacturing range
In order to facilitate the manufacture of bursting discs, the pressure range in which the design burst pressure is allowed to vary during manufacturing. This allowable pressure range must be determined by negotiation between the supplier and the buyer. 2.0.20 Burst pressure tolerance
The maximum allowable deviation of the actual test burst pressure of the bursting disc relative to the calibrated burst pressure. Its value can be an absolute value or percentage that is equal to positive and negative.
When the agreed manufacturing range is zero, this tolerance represents the maximum deviation from the design burst pressure. 2.0.21 Discharge area
The geometrically minimum flow area of a bursting disc device. Used to calculate the theoretical discharge volume of a bursting disc device. When calculating the discharge area, various situations that may reduce the channel cross-section after the bursting disc bursts or falls off should be considered, such as blockage caused by the tool holder, back pressure bracket, bursting disc debris, etc. 2.0.22 Discharge volume (also known as discharge capacity) The flow rate of pressure medium that can be discharged through the discharge area after the bursting disc bursts. 2.0.23 Batch
A group of bursting discs with the same type, specification, calibrated bursting pressure and bursting temperature, and whose materials (brand, performance) and manufacturing processes are exactly the same is a batch. 66
3.0.1 Positive arch metal bursting disc device (tensile metal bursting disc device). 3.0.2 Reverse metal bursting disc device (compression metal bursting disc device). 3.0.3
It can be further subdivided according to the structural characteristics of the components, see Table 3.0.3. Classification of metal bursting discs
Positive arch type
Reverse arch type
Ordinary type
Slit type
Back pressure bracket type
Reinforcement ring type
Soft cushion type
Grooved type
Clamp ring type
Back pressure bracket type
Tool holder type
Crocodile tooth type
Grooved type
The clamping surface and external sealing surface types of the clamp are shown in Table 3.0.4 The clamping surface and external sealing surface types of the clamp are shown in Table Clamping surface shape
External sealing surface shape
Return convex surface
4 Setting of bursting discs
4.0.1 Independent pressure vessels and/or pressure piping systems are equipped with safety valves, bursting disc devices or a combination of the two.
4.0.2 The bursting disc should be used preferentially in any of the following situations: 4.0.2.1 The pressure may rise rapidly; the discharge medium contains particles, is easy to precipitate, crystallize, polymerize, and has high viscosity; 4.0.2.2
The discharge medium is highly corrosive and the price is very high when using a safety valve; 4.0.2.3
The process medium is very expensive or highly toxic, and no leakage is allowed during the operation. It should be connected with the safety valve 4.0.2.4
All valves are used in series;
When the working pressure is very low or very high, it is difficult to manufacture the safety valve;4.0.2.5
When the operating temperature is low and affects the working characteristics of the safety valve;4.0.2.6
A larger discharge area is required.
4.0.3For one-time use pipeline systems (such as pipeline venting systems for pre-start-up purge), bursting discs are installed in situations where the rupture of the bursting disc does not affect operation and production. 4.0.4To reduce the loss of process media after the bursting disc ruptures, it can be used in series with the safety valve, see Chapter 8 for details. 4.0.5As an additional safety facility for pressure vessels, it can be used in parallel with the safety valve, for example, the bursting disc is only used for overpressure relief in the event of a fire.
To increase the discharge area under abnormal conditions (such as fire, etc.), the bursting disc can be used in parallel. 4.0.6
Burst discs are not suitable for situations where overpressure is often present. 4.0.7
Burst discs should not be used in places where the temperature fluctuates greatly. 5.0.1
5 Calculation of discharge volume and discharge area of burst discs The rated discharge volume (discharge capacity) of a burst disc in a physical overpressure process is calculated according to the following formula: Gas
Water vapor
W≤55.8C.CaP
W≤5.2CoC.aP
W<5.1Cosapp
Rated discharge volume (discharge capacity) of a burst disc, kg/h (see 5.0.3), minimum discharge area of a burst disc, mm
Characteristic coefficient of a gas, obtained from Figure 11.0.3 or calculated according to formula (5.0.1--4): C
[() is the maximum value of the critical discharge pressure ratio.
(5.0.1—1)
(5.0.1—2)
(5.0.1—4)
(2) high, when Po/P is equal to or less than the critical discharge pressure ratio, C has an extreme h+1
Cmax=0.7071
k—adiabatic index;
C—characteristic coefficient of water vapor, saturated steam with a steam pressure less than 16MPa (table), C~1, the C. value of superheated steam decreases with the increase of superheat temperature, refer to Table 11.0.2; M -
gas molecular weight;
- bursting disc design bursting pressure, MPa
P.-- back pressure, MPa:
T-- absolute temperature of the released gas in the container or equipment, K; Z-- gas compression factor, according to T, and P. From Figure 16.0.6 in "Setting and Selection of Safety Valves" (HG/T20570.2-95), we can find:
- liquid density, kg/m;
- rated discharge coefficient, take C. - 0.62 or measured value - correction coefficient of liquid dynamic viscosity, according to Reynolds number Re:
from Figure 11.0.4; when the liquid viscosity is equal to or less than the viscosity of water, take = 1. 5.0.2 For chemical overpressure processes (such as internal explosions), due to its complex mechanism and various working conditions, there is currently no calculation formula, and the required bursting disc can only be determined through experiments. API-521 "GUIDE FOR PRESSURE-RELIEVING AND DEPRESSURING SYSTEMS" 1990 standard recommends that when there is no test data, the burst area is 6.6m/100m2 volume (applicable to air-hydrocarbon system). 5.0.3 Calculation steps of bursting disc release volume and release area 5.0.3.1 Calculate the release volume according to the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" issued by the Ministry of Labor (implemented on January 1, 1991).
(1) No insulation layer
W2. 55X105FXA0. 82
W--Release volume, kg/h;
Hr--Gasification heat under release conditions, kJ/kgA--Wetted area, m;
F-Container outer wall correction factor.
(5.0.3-1)
For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95). (2) With insulation layer
W=2.61X(650-t)XXXA0.82
-Discharge temperature, ℃,
A-Thermal conductivity of insulation material, kJ/m·h·℃, d. Thickness of insulation material, m.
(5.0.3—2)
5.0.3.2 According to the American Petroleum Institute standard API-520: When there are adequate fire protection measures and the leaked materials on the ground can be discharged in time, the discharge volume is calculated by formula (5.0.3-3): W_1.555X105XFXA0.82
Otherwise, the formula (5.0.3-4) is used for calculation: W_2. 55X105×F×A0.82
(5.0.3—3)
(5.0.3—4)
The symbols in the formula are the same as those in formula (5.0.3-1). For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95).
5.0.3.3 The minimum discharge area (a) of the bursting disc is obtained by formula (5.0.1-1~5.0.1-4). The discharge diameter (d) is calculated by the value of a and rounded up according to the nominal diameter of the standard pipe diameter. 5.0.3.4 The minimum discharge area (a) is calculated again according to the rounded d, and the rated discharge volume of the bursting disc is calculated according to the working conditions using formula (5.0.1-1, 5.0.1-2 or 5.0.1-3). If the requirements are met, the minimum discharge area and discharge diameter are selected.
6.0.1 Burst pressure tolerance
6 Burst pressure of bursting disc
The burst pressure tolerance is shown in Table 6.0.1.
Burst pressure tolerance
Bursting disc type
Positive arch type
Reverse arch type
6.0.2 Manufacturing range of bursting disc
Rated burst pressure
MPa (table)
Allowable deviation
The manufacturing range of bursting disc is the pressure range that the designed burst pressure is allowed to change during manufacturing, which must be determined by negotiation between the supply and demand parties. The calibrated burst pressure within the manufacturing range shall comply with the burst pressure tolerance specified in this regulation (see Table 6.0.1).
6.0.2.1 Manufacturing range of positive arch type bursting disc
It is divided into: standard manufacturing range; 1/2 standard manufacturing range; 1/4 standard manufacturing range; it can also be zero. The manufacturing range of bursting disc is shown in Table 6.0.2.
Bursting disc manufacturing range
Designed bursting pressure
MPa(table）
0.17~0.26
0.27~0.40
0.41~0.70
1. 1~1. 4
Above 3.6
Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/2Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/4Standard manufacturing range
Upper limit (positive)
Lower limit (negative)0. 1—1)
(5.0.1—2)
(5.0.1—4)
(2) high, when Po/P is equal to or less than the critical discharge pressure ratio, C has an extreme h+1
Cmax=0.7071
k—adiabatic index;
C—characteristic coefficient of water vapor, saturated steam with a steam pressure less than 16MPa (table), C~1, superheated steam C. The value decreases with the increase of superheat temperature, refer to Table 11.0.2; M -
gas molecular weight;
- bursting disc design bursting pressure, MPa
P.-- back pressure, MPa:
T-- absolute temperature of the released gas in the container or equipment, K; Z-- gas compression factor, according to T, and P. From Figure 16.0.6 in "Setting and Selection of Safety Valves" (HG/T20570.2-95), we can find:
- liquid density, kg/m;
- rated discharge coefficient, take C. - 0.62 or measured value - correction coefficient of liquid dynamic viscosity, according to Reynolds number Re:
from Figure 11.0.4; when the liquid viscosity is equal to or less than the viscosity of water, take = 1. 5.0.2 For chemical overpressure processes (such as internal explosions), due to its complex mechanism and various working conditions, there is currently no calculation formula, and the required bursting disc can only be determined through experiments. API-521 "GUIDE FOR PRESSURE-RELIEVING AND DEPRESSURING SYSTEMS" 1990 standard recommends that when there is no test data, the burst area is 6.6m/100m2 volume (applicable to air-hydrocarbon system). 5.0.3 Calculation steps of bursting disc release volume and release area 5.0.3.1 Calculate the release volume according to the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" issued by the Ministry of Labor (implemented on January 1, 1991).
(1) No insulation layer
W2. 55X105FXA0. 82
W--Release volume, kg/h;
Hr--Gasification heat under release conditions, kJ/kgA--Wetted area, m;
F-Container outer wall correction factor.
(5.0.3-1)
For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95). (2) With insulation layer
W=2.61X(650-t)XXXA0.82
-Discharge temperature, ℃,
A-Thermal conductivity of insulation material, kJ/m·h·℃, d. Thickness of insulation material, m.
(5.0.3—2)
5.0.3.2 According to the American Petroleum Institute standard API-520: When there are adequate fire protection measures and the leaked materials on the ground can be discharged in time, the discharge volume is calculated by formula (5.0.3-3): W_1.555X105XFXA0.82
Otherwise, the formula (5.0.3-4) is used for calculation: W_2. 55X105×F×A0.82
(5.0.3—3)
(5.0.3—4)
The symbols in the formula are the same as those in formula (5.0.3-1). For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95).
5.0.3.3 The minimum discharge area (a) of the bursting disc is obtained by formula (5.0.1-1~5.0.1-4). The discharge diameter (d) is calculated by the value of a and rounded up according to the nominal diameter of the standard pipe diameter. 5.0.3.4 The minimum discharge area (a) is calculated again according to the rounded d, and the rated discharge volume of the bursting disc is calculated according to the working conditions using formula (5.0.1-1, 5.0.1-2 or 5.0.1-3). If the requirements are met, the minimum discharge area and discharge diameter are selected.
6.0.1 Burst pressure tolerance
6 Burst pressure of bursting disc
The burst pressure tolerance is shown in Table 6.0.1.
Burst pressure tolerance
Bursting disc type
Positive arch type
Reverse arch type
6.0.2 Manufacturing range of bursting disc
Rated burst pressure
MPa (table)
Allowable deviation
The manufacturing range of bursting disc is the pressure range that the designed burst pressure is allowed to change during manufacturing, which must be determined by negotiation between the supply and demand parties. The calibrated burst pressure within the manufacturing range shall comply with the burst pressure tolerance specified in this regulation (see Table 6.0.1).
6.0.2.1 Manufacturing range of positive arch type bursting disc
It is divided into: standard manufacturing range; 1/2 standard manufacturing range; 1/4 standard manufacturing range; it can also be zero. The manufacturing range of bursting disc is shown in Table 6.0.2.
Bursting disc manufacturing range
Designed bursting pressure
MPa(table）
0.17~0.26
0.27~0.40
0.41~0.70
1. 1~1. 4
Above 3.6
Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/2Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/4Standard manufacturing range
Upper limit (positive)
Lower limit (negative)0. 1—1)
(5.0.1—2)
(5.0.1—4)
(2) high, when Po/P is equal to or less than the critical discharge pressure ratio, C has an extreme h+1
Cmax=0.7071
k—adiabatic index;
C—characteristic coefficient of water vapor, saturated steam with a steam pressure less than 16MPa (table), C~1, superheated steam C. The value decreases with the increase of superheat temperature, refer to Table 11.0.2; M -
gas molecular weight;
- bursting disc design bursting pressure, MPa
P.-- back pressure, MPa:
T-- absolute temperature of the released gas in the container or equipment, K; Z-- gas compression factor, according to T, and P. From Figure 16.0.6 in "Setting and Selection of Safety Valves" (HG/T20570.2-95), we can find:
- liquid density, kg/m;
- rated discharge coefficient, take C. - 0.62 or measured value - correction coefficient of liquid dynamic viscosity, according to Reynolds number Re:
from Figure 11.0.4; when the liquid viscosity is equal to or less than the viscosity of water, take = 1. 5.0.2 For chemical overpressure processes (such as internal explosions), due to its complex mechanism and various working conditions, there is currently no calculation formula, and the required bursting disc can only be determined through experiments. API-521 "GUIDE FOR PRESSURE-RELIEVING AND DEPRESSURING SYSTEMS" 1990 standard recommends that when there is no test data, the burst area is 6.6m/100m2 volume (applicable to air-hydrocarbon system). 5.0.3 Calculation steps of bursting disc release volume and release area 5.0.3.1 Calculate the release volume according to the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" issued by the Ministry of Labor (implemented on January 1, 1991).
(1) No insulation layer
W2. 55X105FXA0. 82
W--Release volume, kg/h;
Hr--Gasification heat under release conditions, kJ/kgA--Wetted area, m;
F-Container outer wall correction factor.
(5.0.3-1)
For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95). (2) With insulation layer
W=2.61X(650-t)XXXA0.82
-Discharge temperature, ℃,
A-Thermal conductivity of insulation material, kJ/m·h·℃, d. Thickness of insulation material, m.
(5.0.3—2)
5.0.3.2 According to the American Petroleum Institute standard API-520: When there are adequate fire protection measures and the leaked materials on the ground can be discharged in time, the discharge volume is calculated by formula (5.0.3-3): W_1.555X105XFXA0.82
Otherwise, the formula (5.0.3-4) is used for calculation: W_2. 55X105×F×A0.82
(5.0.3—3)
(5.0.3—4)
The symbols in the formula are the same as those in formula (5.0.3-1). For the calculation of A and F, refer to the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95).
5.0.3.3 The minimum discharge area (a) of the bursting disc is obtained by formula (5.0.1-1~5.0.1-4). The discharge diameter (d) is calculated by the value of a and rounded up according to the nominal diameter of the standard pipe diameter. 5.0.3.4 The minimum discharge area (a) is calculated again according to the rounded d, and the rated discharge volume of the bursting disc is calculated according to the working conditions using formula (5.0.1-1, 5.0.1-2 or 5.0.1-3). If the requirements are met, the minimum discharge area and discharge diameter are selected.
6.0.1 Burst pressure tolerance
6 Burst pressure of bursting disc
The burst pressure tolerance is shown in Table 6.0.1.
Burst pressure tolerance
Bursting disc type
Positive arch type
Reverse arch type
6.0.2 Manufacturing range of bursting disc
Rated burst pressure
MPa (table)
Allowable deviation
The manufacturing range of bursting disc is the pressure range that the designed burst pressure is allowed to change during manufacturing, which must be determined by negotiation between the supply and demand parties. The calibrated burst pressure within the manufacturing range shall comply with the burst pressure tolerance specified in this regulation (see Table 6.0.1).
6.0.2.1 Manufacturing range of positive arch type bursting disc
It is divided into: standard manufacturing range; 1/2 standard manufacturing range; 1/4 standard manufacturing range; it can also be zero. The manufacturing range of bursting disc is shown in Table 6.0.2.
Bursting disc manufacturing range
Designed bursting pressure
MPa(table）
0.17~0.26
0.27~0.40
0.41~0.70
1. 1~1. 4
Above 3.6
Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/2Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/4Standard manufacturing range
Upper limit (positive)
Lower limit (negative)3-1), the calculation of A and F, see the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95).
5.0.3.3 The minimum discharge area (a) of the bursting disc is obtained by formula (5.0.1-1~5.0.1-4). The discharge diameter (d) is calculated by the value of a and rounded up according to the nominal diameter of the standard pipe diameter. 5.0.3.4 The minimum discharge area (a) is calculated again according to the rounded d, and the rated discharge volume of the bursting disc is calculated according to the working conditions using formula (5.0.1-1, 5.0.1-2 or 5.0.1-3). If the requirements are met, the selected minimum discharge area and discharge diameter are obtained.
6.0.1 Burst pressure tolerance
6 Burst pressure of bursting disc
The burst pressure tolerance is shown in Table 6.0.1.
Burst pressure tolerance
Bursting disc type
Positive arch type
Reverse arch type
6.0.2 Manufacturing range of bursting disc
Rated burst pressure
MPa (table)
Allowable deviation
The manufacturing range of bursting disc is the pressure range that the designed burst pressure is allowed to change during manufacturing, which must be determined by negotiation between the supply and demand parties. The calibrated burst pressure within the manufacturing range shall comply with the burst pressure tolerance specified in this regulation (see Table 6.0.1).
6.0.2.1 Manufacturing range of positive arch type bursting disc
It is divided into: standard manufacturing range; 1/2 standard manufacturing range; 1/4 standard manufacturing range; it can also be zero. The manufacturing range of bursting disc is shown in Table 6.0.2.
Bursting disc manufacturing range
Designed bursting pressure
MPa(table）
0.17~0.26
0.27~0.40
0.41~0.70
1. 1~1. 4
Above 3.6
Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/2Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/4Standard manufacturing range
Upper limit (positive)
Lower limit (negative)3-1), the calculation of A and F, see the corresponding provisions of "Setting and Selection of Safety Valves" (HG/T20570.2-95).
5.0.3.3 The minimum discharge area (a) of the bursting disc is obtained by formula (5.0.1-1~5.0.1-4). The discharge diameter (d) is calculated by the value of a and rounded up according to the nominal diameter of the standard pipe diameter. 5.0.3.4 The minimum discharge area (a) is calculated again according to the rounded d, and the rated discharge volume of the bursting disc is calculated according to the working conditions using formula (5.0.1-1, 5.0.1-2 or 5.0.1-3). If the requirements are met, the selected minimum discharge area and discharge diameter are obtained.
6.0.1 Burst pressure tolerance
6 Burst pressure of bursting disc
The burst pressure tolerance is shown in Table 6.0.1.
Burst pressure tolerance
Bursting disc type
Positive arch type
Reverse arch type
6.0.2 Manufacturing range of bursting disc
Rated burst pressure
MPa (table)
Allowable deviation
The manufacturing range of bursting disc is the pressure range that the designed burst pressure is allowed to change during manufacturing, which must be determined by negotiation between the supply and demand parties. The calibrated burst pressure within the manufacturing range shall comply with the burst pressure tolerance specified in this regulation (see Table 6.0.1).
6.0.2.1 Manufacturing range of positive arch type bursting disc
It is divided into: standard manufacturing range; 1/2 standard manufacturing range; 1/4 standard manufacturing range; it can also be zero. The manufacturing range of bursting disc is shown in Table 6.0.2.
Bursting disc manufacturing range
Designed bursting pressure
MPa(table）
0.17~0.26
0.27~0.40
0.41~0.70
1. 1~1. 4
Above 3.6
Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/2Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
1/4Standard manufacturing range
Upper limit (positive)
Lower limit (negative)
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