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These natural gas engines are rich-burning and there is up to 9% oxygen in the exhaust, making 3-way catalysts unusable for NOx. Thanks for all the good comments, I agree with urea as a better choice from a storage risk perspective and have tried to make a case to end the conversation. MT

I am working on a natural gas gen-set and am specifying a urea-based SCR to meet the local NOx limitations. My client has asked about consideration for aqueous ammonia in lieu. Does anybody have any experience as to the differences between the two in capital cost, operating cost, level of...

I am in disagreement with some of my colleagues as to whether to take credit for insulation on a propane dehydrator vessel for the fire sizing case. The vessel is insulated and I have selected an environment factor F as per table 5 of API Std 521 in accordance with the insulation type and...

I have been asked to come up with a quick comparison of CaCl2 dryers and molecular sieves for drying of 200 t/h LPG. I think I have a good idea of the technical comparison and the operational considerations based on thread135-124876, but I have little experience with the capital cost comparison...