Excessive Pump Suction Nozzle Loads

[FlashPurp]

Hello,

I am working on stress on pump suction piping coming from a tank. I am seeing high moments and nozzle loads on my pump during hot and cold operation. I believe the issue is with how my header is growing and contracting during the 2 cases, so I was wondering the best way to restrain without transferring loads to the pump nozzles? Or would it be best to reroute the header to add flex and reduce movement?

Information:
Fluid: Water
Low Temp: 30 F; Hot Temp: 150 F
Design Pressure: 50 PSIG
Material: A312 TP304
Header Size: 18" SCH 10S
Branch Size: 12" SCH 10S
Nozzle Size: 8"

This is the layout I currently have it:


Movement during cold operation:

Movement during hot operation:

 

[XL83NL]

There are comparable threads here on ET that, albeit with a few different details (like linesize, temperature, material) deal with the same issue. The solution(s) can all be found in those topics. You'll find them easily using google or the site search engine. I suggest you read those, and do the math. Usually, the standard solution works well for 90% of situations, but you haven't provided many details. Let us know if you need advice on a specific question.
PS: at forehand I'd talk with the piping engineer and let him reroute this system as it doesn't seem to have (sufficient) inherent flex, so any time spent by a competent pipe stressed is useless.