[MW:20640] Stress Relieving of Titanium Grade 2 Tubes

Our client requirement states that Stress Relieving of Titanium U bends is mandatory. Our Metallurgy of Tubes is SB 368 Gr. 2 (UNS R50400)
Tube side fluid is sea water and Shell side fluid is sour gas (172 bar Pressure and 170 deg cel at shell side)

In view of above , please let me know , Is it really require to perform SR of Titanium U bends. 

NACE states that Titanium is susceptible to Stress corrosion cracking. Vendors are not in opinion of doing SR. 

Please provide your valuable input

Thanks
Ashish

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