Strictly speaking, unless a piece of rotating equipment is built in accordance with an industry standard (such as API-610, NEMA SM-23, etc), then the vendor is going to give you the allowables that his equipment can take. This could also be addressed in the beginning by specifying minimum values required as part of the bid package (i.e. making meeting those applied loads a techincal qualification for a valid bid).
Sounds like you are probably beyond that point. It seems pretty clear from those allowables that your company has bought a light weight blower and expected rubber or (more commonly) teflon expansion joints/isolators to be applied to isolate the blower from piping loads.
If the vendor is in compliance with the purchase order, you probably don't have much of a leg to stand on, unless the client approves additional money to beef up the blower casing.
You may want to review with the process and rotating equipment engineer what the real gas temperature is going to be in the system. The blower data sheet may indicate one temperature, but the line list that you checked the piping against have some higher rounded up temperature. This may give you some relief on loads (though probably not a 6x reduction).
Finally, you may need to push back on the client regarding not using expansion joints. I can understand concerns with having a flexible joint in a dangerous fluid service. But, if it is that serious, then the client shouldn't have bought some piece of junk low end blower. Something has to give.
_________________________
Edward L. Klein
Pipe Stress Engineer
All the world is a Spring
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