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Materials Nozzles Exceeding Temperature Limits on Refractory Lined Tanks

Materials Nozzles Exceeding Temperature Limits on Refractory Lined Tanks

Materials Nozzles Exceeding Temperature Limits on Refractory Lined Tanks

(OP)
Please give me some guidance I have a vessel that is refractory Lined tank and the nozzle is not lined it is carbons steel A105/A106, The CS exceeds the material limitations by more than 30%
our temp is seeing 1650°F,
We are using
Bolting – assuming that flanges are not insulated:
1. ASTM A320 Gr B8 Cl. 1 w/ A194 Gr. 8 Nuts Max Temp: 1500°F (ensure the carbon content is 0.04 or higher for temperature above 1000°F and calculations are made for leakage)
2. SB-572 Alloy N06002 Annealed, OR B572 Alloy R30556 Annealed Max Temp: 1650°F
Gaskets
1. Lamons Gasket: Class 150 Kammpro LP-3 310SS Mica 310SS GR
OR
2. Teadit Gasket: TerMica 1863

Its been in service for many years and we are replacing some instrument connections.
I have concerns re the material



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