Rupture Disc Device Materials (marketing department of Shanghai HY Industry Co., Ltd)

1 Overview (Rupture Disc Device Materials)

The bursting disc device is a non-reclosed emergency overpressure relief device driven by pressure difference, which can play a role in safety protection when overpressure or excessive vacuum occurs in pressure vessels, pressure pipelines or other confined spaces. Compared with the safety valve, the bursting disc device has the advantages of large pressure relief area, sensitive action, high precision, good sealing, corrosion resistance and not easy to block. It can be used alone or in combination with the safety valve. After the pressure is released, the rupture disc can no longer be used effectively, and the container will be forced to stop running.
For pressure-bearing equipment that meets one of the following conditions, the bursting disc device should be preferred:

1. Design does not allow the leakage of the fluid medium in the pressure-bearing equipment;

2. Pressure in the pressure-bearing equipment rises rapidly, and the opening speed of the safety valve cannot meet the requirements;

3. Safety valve cannot work normally due to the low temperature environment;

4. Fluid medium is viscous, contains particles, is easy to precipitate, crystallizes or polymerizes to form polymer viscous substances, etc., which lead to the failure of the safety valve;

5. Safety valve is not suitable for working conditions such as too large pressure relief area or too high (low) relief pressure.

Basic structural forms of rupture discs are mainly divided into four categories: flat plate, positive arch, reverse arch and graphite rupture disc. In fact, graphite rupture discs also belong to flat rupture discs.

Bursting disc device is composed of a bursting disc (or bursting disc assembly), a holder (or a support ring, a pressure ring), etc., and is usually installed between the flanges, as shown in Figure 2. When the pressure difference between the two sides of the bursting disc reaches the set value at the predetermined temperature, the bursting disc acts immediately (ruptures or falls off) and releases the pressure medium. The function of the holder is to clamp and protect the rupture disc to ensure a stable burst pressure.

Design, manufacture and selection of bursting disc devices shall comply with the following standard specifications:

• GB/T 567.1~GB567.4 “Rupture Disc Safety Device”

• GB/T 150.1 “Pressure Vessel”

• GB/T 16918 “Rupture Disc Safety Device for Gas Cylinders”

• GB/T 20801.6 “Industrial Pipelines – Part 6: Safety Protection”

• TSG 21 “Stationary Pressure Vessel Safety Technical Supervision Regulations”

• TSG ZF003 “Rupture Disc Device Safety Technical Supervision Regulations”

  2. Material selection (Rupture Disc Device Materials)

• Material performance of the bursting disc is an important factor affecting the bursting pressure. When selecting the material, not only the maximum service temperature of the material, but also the corrosion resistance of the material to the medium must be considered. The material used for the rupture disc is not allowed to be corroded by the medium. If necessary, a fluoroplastic layer can be sprayed on the metal surface in contact with the medium, or a fluoroplastic protective layer can be added as an anti-corrosion protective film.

• When there is a spray coating on the surface of the rupture disc or fluoroplastic is used as the sealing film (or lining film) in the rupture disc assembly, attention should be paid to the influence of the coating or fluoroplastic on the maximum operating temperature. F4 (or PFA) is used in the spray coating or rupture disc assembly, and the maximum operating temperature is 260 °C; the spray coating or bursting disc assembly uses F46, and the maximum operating temperature is 200 °C.

Table 1 Common materials and applicable temperature of bursting discs (excerpted from GB567.1）

Table 2 The allowable temperature range of commonly used sealing membrane materials for rupture discs (from GB567.1)

Table 3 Selection reference of clamping equipment materials

Shanghai HY Industry Co., Ltd has international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences.When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.

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