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Allowable Stresses for Cast Tubesheet and Tube Support Materials


Following table details the allowable stresses for Cast Tube sheet and Tube support Materials.


Material
Temperature (1)Dead Load Stress
psi (3)
Dead Load Stress Plus
Frictional Stress,
psi (3)
°F°C
Cast Carbon Steel<=800<=4271070021400
5 Cr - 1/2 Mo (A217 Gr C5)<=800<=4271800036000
900482750015000
100053845009000
110059325005000
115062118003600
19 Cr - 9 Ni (A297 Gr HF) (4)1000 and below5381730017300
11005931867018670
1200649825016500
1300704700014000
140076032506500
150081619003800
25 Cr 20 Ni (A351 HK 40)1200649818016360
1300704566011310
140076041508300
150081628505700
160087118003590
170092711502300
18009829001800
190010385501100
25 Cr - 35 Ni (HP45 Modified)180098212502500
190010387001400
20001093210420
50 Cr - 50 Ni + Nb (A560 IN 657)11005931353027060
12006491024020480
1300704783015660
1400760510010200
150081633006600
160087119003800
170092711002200
18009827501500

Notes:

  1. For intermediate temperatures, allowable stress may be obtained from a smooth curve through the data points
  2. Casting factor of 0.8 has NOT been applied to these stress values
  3. 1 psi = 6.9 kPa
  4. Data are partially based on ultimate tensile or yield strength
  5. Unless otherwise noted, data are based on creep or rupture criteria in API STD 560



Tags: Stresses Tubesheet Materials