【Q&A Question 023】2016.05.13
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【Q&A Question 023】May 13, 2016: What should be considered when calibrating safety valves in areas with high hydrogen sulfide levels? The answer key will be available after responding; scoring is based on answering the key points. 1. Prevent hydrogen sulfide leaks that can cause poisoning and fires due to faulty valves. 2. Prevent the spontaneous combustion of ferrous sulfide.
Prevent poisoning caused by residual gases, and prevent spontaneous combustion of the corrosive product ferrous sulfide
1. Hydrogen sulfide reacts with iron to form ferrous sulfide, which then oxidizes naturally when exposed to air
Take proper precautions against hydrogen sulfide; prepare emergency response plans when removing safety valves
If verification is carried out online, the operator must take protective measures to prevent hydrogen sulfide poisoning. If verification is done offline, it is necessary to ensure that there are no leaks in the manual valves located before and after the safety valve. When removing the flanges, lift one side first to check for any leaks; only after confirming that there are no leaks can the flanges be removed for verification
Corrosion of safety valve bodies by hydrogen sulfide
Under normal circumstances, promptly removing oxides and elemental sulfur from the attachments can effectively prevent accidents of spontaneous ignition of these safety attachments. Therefore, taking targeted preventive measures can avoid such incidents. When designing, storage tank attachments made of materials resistant to hydrogen sulfide corrosion should be used.
Hydrogen sulfide leakage poisoning, fires, and spontaneous combustion of ferrous sulfide.
Be careful of spring corrosion during inspection.