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Thank you 25362 and Homayun. From the other plant data, I can find that steam rings are installed pressure at 5~7 bar, temperature 220~280 deg C. This pressure/temperature region is just below the hydrogen embrittlement region of carbon steel. If hydrogen self-ignition is only pressure...

Homayun, I can find related topic regarding H2 self-ignition. Visit <a href="http://www.eng-tips.com/viewthread.cfm?qid=51712">thread 135-51712</a> Tons of informations for H2

Dear Homayun, Thanks for information. On reference, AIT(Auto ignition temp.) of H2 is shown as above 520 degree C. But I guess pressure may contribute lower the AIT. Could you please advise more detail values of pressure and temperature?

It is known that steam rings are used for fire suppression caused by hydrogen leak among the hydrogen piping joint part around the Hydrocracker. But I can't decide where steam rings to be installed. Should I install every piping joint part? or is there some guidelines for steam ring...

Thank you TTFN, But I'm still curious. Monitors, gauges, alarms can prevent safety problem also process upsets. But can it be the last line of defence? In my opinion, alarms and indicators can not prevent escalation of crisis when it already happen. I feel that fail-safes or fire and gas...

Thank you all, Through the all posted, I can figure out the definition of SC as; 1. Independent from the process. 2. Can be identified during the risk analysis e.g. FMECA, QRA, Consequence Analysis, Fire Protection Analysis.. 3. Provided to prevent certain level of equipment damage, personal...

In many project, I've met the word "Safety-critical equipment". And experienced that some particular systems such as flare system, fire fighting system, ESD systems etc. have been considered as "safety-critical equipment". It is generally agreed but hard to define clearly. Are there any...

Thank you Guido, Your brief introduction is great help to figure out the scheme of dropped object risk assessment. Additionally is there any examples on the web? or books? can help me to understand which kind of specific actions have been implemented by the result of dropped object risk assessment?

Hi there, Are there any one to help me about dropped object study? Currently I should present about the Dropped Object Study and I have few material. It's not clear to me about followings; 1. Purpose of Dropped Object Study 2. Step by step method of Dropped Object Study (I have one example, but...

Hi there, Are there any one to help me about dropped object study? Currently I should present about the Dropped Object Study and I have few material. It's not clear to me about followings; 1. Purpose of Dropped Object Study 2. Step by step method of Dropped Object Study (I have one example, but...

Hi there, Does any one can help me to design remote impoundment for LPG installations? Currently I should to design the remote impundment for 7 LGP bullets above ground. Each size is 3.9 m Dia x 34.2 m L about 390m3 of LPG. I've investigated API 2510 & 2510A but still can't figure out it's...

Hi there, Does anyone has guidelines for selecting steam tracing or electric tracing to maintain temperature inside pipe lines? any comments or tips are appreciated.

Thank you for your kind advices. But still I worry about this; 1. If pipe line cooldown performed intermittently, is there no thermal fatigue on pipe(LTCS) expected? 2. Currently circulation and loading header is common. If we operate loading and circulation pump by parallel, small capacity...

During propane and butane storage and export facility design, I met some dimed points because of my lack of experience. Please advise me about following questions; In this plant we have two Propane storage tanks and two Butane storage tank. Also 2.5 km away from the tank farm, there are two...