Actually i am doing analysis of a Hot Reheat line 24inch 585 Degc39bar press

of boiler at saftey valve discharge my boiler vendor has given a horizontal force of 20KN to be act at the saftey valve discharge also the vertical force will be 2oKN while applying the both in Operating + Saftey relive valve case i found the straess in occasional condition goes high that is 97% i want to limit it by 85% .

Can any one tell me as per my knowldge 20KN load in the horizontal direction in saftey vale discharge is too high also tell me how to reduce the stress at the stub on which saftey valve is mounted i have already tried this with fabricated TEE still it fails in stress i cant put Reinforce pad because its P-91 material please help me