Gentlemen,
Sour serive & lethal service are totally different terms. A sour service vessel can be of non-lethal.
Please refer below definitions extracted from Specification.
Wet Sour Service: Following process streams containing water and hydrogen sulfide: i) Sour water with a hydrogen sulfide (H2S) concentration above 2 mg/L (2 ppm) and a total pressure of 400 kPa absolute (65 psia) or greater. ii) Hydrocarbon services meeting the definition of sour environments in SAES-A-301, where the H2S concentration of 2 mg/L (2 ppm) or more in the water phase is equivalent to H2S partial pressure of 0.05 psia. Sour crude systems upstream of a stabilization facility and sour gas upstream of a sweetening or dehydration plant are examples of such environments. iii) Hydrocarbon systems exposed to an environment with a H2S concentration above 50 mg/L (50 ppm) in the water phase, regardless of H2S partial pressure. (As per Aramco Specification)
Lethal Service are meant use of poisonous gases or liquids of such a nature that a very small amount of the gas or of the vapor of the liquid mixed or unmixed with air is dangerous to life when inhaled ( As per UW-2, ASME SecVIII, DIv.1)
Sent: Monday, March 28, 2011 08:39 AM
To: materials-welding@googlegroups.com
Subject: [MW:10507] Lethal Service / ASME Sec VIII Div 1
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