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Home > TECHNICAL SUPPORT > KOSHA Obligation Safety CertificationKOSHA Obligation Safety Certification
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What is 'Obligation Safety Certification'?
Regarding of manufacture protection devices and protective equipments of hazardous machinery and instrument, it is the system that prevents from industrial accident to produce, distribute and use safe and reliable products by attaching the certification mark to products meet the requirements of safety certification criteria and selling
Korea Obligation Safety Certification Mark
Scope of Obligation Safety Certification
Scope of Rupture Discs which are used to protect pressure vessels from overpressure or high vacuum by gas or steam
(However, it is excepted when used for release a pressure of liquid or the setting value of rupture pressure is below 0.1MPag)
Main contents and Requirements of Obligation Safety Certification
- It shall be conduct a burst test under the same temperature as service condition
- When you apply for certification, it is required a certification of the same type separately if it is different to specification submitted
- It shall be certified, even if it is imported products
Relevant regulations
- Occupation safety and health acts
- Regulations for Occupation safety and health acts
- Implementing Regulations in Occupation safety and health acts
- Notification of Protection Device Obligation Safety Certification Criteria
- Notification for declaration of Safety Certification and Autonomy Safety Confirmation
Performance Criteria of Products
Burst test
| Set Pressure | below 0.3MPag | 0.3MPag and over |
|---|---|---|
| Allowable range of rupture Pressure | ±0.015MPag | ±5% |
Leak test
| Division | Soak time | |
|---|---|---|
| Nominal diameter of rupture disc(mm) | 50 and below | 1 min |
| above 50&100 and below | 2 min | |
| above 100 | 5 min | |
※ It shall be conducted a leak test under 90% of set pressure
※ In case of Flat/Slotted Type, it shall be conducted a leak test under 50% of set pressure
Classification and Notation of the KOSHA Certification Type
Division in accordance with structure
| Rupture disc of dome type (C) | Single plate type (O) |
|---|---|
| Composite type (C) | |
| Carved type or cutout type (S) | |
| Rupture disc of inverted dome type (R) | Carved type or shearing type (S) |
| Self-knife type (K) | |
| Rupture disc of flat type (F) | Exchanger type graphite rupture disc (R) |
| Monoblock type graphite rupture disc (M) | |
| Cutout type rupture disc (S) | |
| Other type (X) | Rupture discs produced depend on the manufacturers which are different than above |
Division in accordance with nominal diameter
| Division of nominal diameter | I | II | III | IV | V |
|---|---|---|---|---|---|
| Range of nominal diameter(mm) | 25 and below | above 25 & 50 and below |
above 50 & 80 and below |
above 80 & 100 and below |
above 100 |
Division in accordance with nominal pressure
| Division of nominal pressure | 1 | 2 | 5 | 10 | 21 | 22 |
|---|---|---|---|---|---|---|
| Range of rupture pressure(MPag) | 1 and below | above 1 & 3 and below |
above 3 & 5 and below |
above 5 & 10 and below |
above 10 & 21 and below |
above 21 |
Notation of type
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