#Pressure vessel meaning full#
#Pressure vessel meaning code#

UG-99(g),(k) – Hydro test visual leak inspection cannot be waived.UG-16(5)(a) – Air cooled and cooling tower heat exchanger tube walls to be 1/16″ min.

U-2(a)(2) – The user determines if the service is lethal.

#Pressure vessel meaning code#

(List last updated Jbased on the ASME 2013 VIII-1 code edition.) Other code sections might also be required. When it has been determined that a vessel is in Lethal Service, some of the following code sections will apply.

Read all of UW-2 for more restrictions….

UW-2(a)(2 and 3) – Heat exchangers have a long list of requirements.

UW-2(a)(1)(c) – Category C joints for stub ends have a long list of requirements.

#Pressure vessel meaning full#

Interpretation VIII-I-98-23 – Category D welds (typically nozzles) shall be full penetration.

No slip on flanges! No Figure UW-13.2 Flange or Head to Shell attachments

UW-2(a)(1)(b&c) &Interpretation VIII-1 92-211 – Category B & C welds shall be type 1 or 2 only (butt welded).

UW-2(a)(1)(a) – Category A welds shall be type 1 only (butt welded with no permanent backing strip).

UW-2(a) – Post weld heat treatment is required for CS and Low Alloy.

UW-2(a) – ERW pipe (like some grades of SA-53) is not permitted but interpretation VIII-1-01-118 says it is acceptable if the long seam is fully radiographed.

UW-2(a) and UW-11(a)(1) – All butt welds shall be 100% radiographed.

UW-2 Service Restrictions is a very important section for lethal service vessels and must be read in its entirety. ASME VIII-1 Lethal Service Code References We at Pressure Vessel Engineering do not determine if the vessel service is lethal (but we might have opinions based on previous jobs). It is up to the user to determine if a service is lethal. For purposes of this Division, this class includes substances of this nature which are stored under pressure or may generate a pressure if stored in a closed vessel. vessel is to contain fluids of such a nature that a very small amount mixed or unmixed with air is dangerous to life when inhaledīy “lethal substances” are meant poisonous gases or liquids of such a nature that a very small amount of the gas or of the vapour of the liquid mixed or unmixed with air is dangerous to-life when inhaled. The second definition is also duplicated in the end notes: Two definitions of lethal service are provided in UW-2. ASME VIII-1 section UW-2 has most of the requirements for lethal service. Requirements for lethal service are scattered through VIII-1, the code cases and the interpretations.

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