So this just refers to acid over 68% P2O5.
Do you have an actual concentration?
It can run clear to 105%.
Once you are over 85% the freezing point is room temp or higher.
The 100% acid is 42C for freezing point.
And it is a bit like syrup for consistency.
Transportation tanks:
"For superphosphoric acid,type 317L (S31703) or 317LN is used,as also alloy 2205
(S31803). The duplex alloy 2205 has higher strength than the fully austenitic grades
and has a coefficient of thermal expansion more closely matching that of the steel
vessel."
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P.E. Metallurgy, consulting work welcomed