Are there any procedures for the detection and handling of hazardous gases and flammable gases in terms of safety?

The first step is to wear an air respirator and a portable alarm device and go to the site for verification. It then depends on the situation whether to contact someone to seal the leak, call the police, isolate the area for treatment, or even shut down the entire installation (in which case an emergency plan must definitely be activated).

There should be an alarm management system for this

Step 1: It is necessary to go to the site for verification to determine whether the alarm was a false alarm； If it is a false alarm, it is necessary to determine whether it is due to a malfunction of the alarm or an occasional incident ； If it is a device issue, contact the relevant personnel to inspect the device ； If there is no problem with the device, resetting the alarm will suffice ； Step 2: (If there is indeed a leak on site), determine whether the leak is visible or not ； If it’s some minor leaks (such as at some valve gaskets) ； Flange surface ； And at some drain points, as well as at some connections of instrument pipelines) they are invisible to the naked eye ； Then it is necessary to go to the site to look for it ； (Mainly by spraying soapy water) Locate the leak point and address it, OK ； If the leakage volume at the site is large (an obvious leakage visible to the naked eye), and it is possible to shut off the flow, efforts should be made to do so in order to stop the leakage; if shutdown is not possible, emergency procedures outlined in the company’s relevant emergency plans should be activated ；

Include it in the operating procedures for positions involving flammable and toxic gases; a separate procedure is not necessary