Here\u2019s a picture of a relief termination found in the field\u2026<\/p>\n
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Notice that the relief termination is cut at a 45 degree angle with the opening facing down. As shown below, this is one of the many <\/strong>termination methods described in the IIAR\u2019s Piping Handbook<\/p>\n Our RAGAGEP is IIAR 2-2014a which states:<\/p>\n IIAR 2 2014a 15.5.1.5* The termination of the discharge shall be directed upward<\/strong> and arranged to avoid spraying ammonia on persons in the vicinity<\/u>.<\/em><\/p>\n Note: In the informative appendix \u201cIIAR 2 2014a A.15.5.1.5 The termination of discharge is considered the final several feet of the relief piping. The vent end point of relief piping may include a design to prevent rain and snow from entering. Many designs provide a method to prevent rain and snow from entering. The design at the vent end point may be a \u201ctee\u201d diffuser…\u201d<\/em><\/p>\n<\/blockquote>\n I\u2019m certainly not the first to notice this issue. A few years ago, Bryan Haywood of SAFTENG.NET<\/a> wrote a small article about it. Others have argued<\/a> that this is a compliant arrangement.<\/p>\n Reasonable people can disagree and often PSM\/RMP is about making a defensible <\/em>case. To me, this relief termination is NOT compliant with IIAR 2 2014a 15.5.1.5 because the release will be directed DOWNWARD at a 45 degree angle directly at a roof where we know we will occasionally have service personnel.<\/p>\n Regardless of where you come down on the compliance<\/em> issue, being compliant does not mean you are safe.<\/p>\n To put it another way, the danger posed by NH3 being released towards the roof and service personnel<\/strong> doesn\u2019t go away even if you believe the arrangement shown above is compliant with IIAR 2 2014a 15.5.1.5.<\/p>\n You\u2019d still have to analyze this hazard and attempt to control it.<\/strong><\/p>\n Note: You could easily modify this arrangement like the picture below to be both compliant AND safe.<\/p>\n By adding a small elbow they’ve directed the flow\u00a0upwards<\/strong> and arranged to avoid spraying ammonia on persons in the vicinity<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" Often, compliance and safety go hand-in-hand. This leads us to believe they are the same thing. Occasionally they are not; and when that\u2019s the case, it is our duty to place SAFETY above Compliance. Relief Piping Termination – A worked … Continue reading ![\"\"](\"https:\/\/taocompliance.com\/wp-content\/uploads\/2019\/08\/IIAR-Relief-1024x958.png\")
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