There is a lot on the net.
Google can do a lot.
P.E. :
http://www.witzenmann.be/be/media/Expansion_joint_manual_1501uk_5_12_12_20_download.pdf
www.ork-flex.com/catalog/pdf/e-catalog4.pdf
I can understand the point of view from Shell,
i worked a long time for another big company, they bought approx. 3000 valves, from 2" to 6" from a new vendor.
They rejected 92%, because of leakage.
http://www.lr.org/nl/energy/upstream/documenten/software.aspx
No, the fluid, design pressure etc, it is mostly cat. IV.
Download the software, it is very useful.