This short article written in basis of deviation proposal from pump manufacturer to challenge API 610 or Project Spec or Company Spec, this sample is easy-kind of deviation, the technical is clear and honest. By the way, if as engineer that you are in-charge for technical review of equipment that you found out that the supplier said; "NO DEVIATION to ALL project spec, company spec, international code & standard". You should start to worry, they did not care at all to read your specification that you devoted to developed, then in any later stage all the finding will pop-up, all the mistake will appear to the surface or if your company bad enough nobody will highlight this (they found it but does not care to follow up). There should be something that cannot be fulfilled, in example the intend of specification wrote sometimes it is dedicated to cold climate environment, or it is dedicated to hot environment. Back to the subject, refer to API 610 12th and 11th edition, secti...