What is the difference between the definition of quick-opening doors in TSG R0004-2009 and that in the 99th edition of the Safety Regulations?

As defined in TSG R0004-2009, a quick-opening pressure vessel is a vessel in which the end cover or head providing access to the vessel, and the vessel’s main body, are equipped with interlocking quick-sealing locking devices. Those connected by bolts (such as swivel bolts) do not belong to quick-opening pressure vessels. The design of quick-opening pressure vessels should take into account the effects of fatigue loads. Quick-opening pressure vessels shall be equipped with safety interlock functions that meet the following requirements: (1) Pressurization may only occur once the quick-opening door has reached its predetermined closed position ； (2) The quick-opening door can be opened only after the internal pressure of the pressure vessel has been completely released. The 1999 version of the Pressure Vessel Regulations does not provide a clear definition of quick-opening doors; it only includes the following description: The quick-opening door (cover) of a pressure vessel with quick-opening doors shall be equipped with safety interlock devices that possess the following functions: 1. An interlock control function that prevents pressurization until the quick-opening door reaches its designated closed position. 　 2. The interlock function for opening the quick-opening door can be activated only after the internal pressure of the pressure vessel has been completely released and the safety interlock device has been disengaged. 　 3. It has an alarm function that synchronizes with the aforementioned actions.