[knives]

Never tried such arrangement before but have seen several on existing plant built by one respected EPC contractor during the 90s (not sure though if this is still in their current practice). In my opinion, such can be applied for olet on ordinary process drains. However, if the purpose of providing the olet is for some pressure or temperature instrument which might need an stable flow for proper read-out, then I think you should avoid placing olet on tee.