ASME Section VIII Division 1, 2023 Edition, CRN AA0903.2, Alberta registration, March 2024
This example is a horizontal pressure vessel with a 72 in outside diameter shell, 2:1 semi-ellipsoidal heads, and a 24 in boot connection integrated into the pressure boundary. It is registered for 1405 psi at 158 F with a design MDMT of -20 F, and the calculated chamber rated MDMT is -24.9 F at the registered condition.
Reece Custom Manufacturing completed the registered design under APEGA Permit 15926 using ASME Section VIII Division 1, 2023 Edition. The calculation set records RT1 marking, a shop hydrotest basis of UG-99(b) at 1.3 times MAWP, and a horizontal vessel arrangement with saddles, multiple flanged process nozzles, and a booted side opening.
This vessel is not a plain cylinder with standard nozzles only. The registered pressure boundary includes a 24 in boot shell with a repad, a 24 in 2:1 ellipsoidal boot head, a 20 in flanged head nozzle, several Class 600 flanged shell nozzles, and local-load checks on selected nozzles, which makes it a good public example of a more involved horizontal vessel layout.
The registered design basis is ASME Section VIII Division 1, 2023 Edition, U.S. Customary units, with internal pressure governing the main chamber. The pressure summary lists 1405 psi MAWP at 158 F, design MDMT of -20 F, rated MDMT of -24.9 F, and no external-pressure design for the chamber.
The main shell and heads are SA-516-70 with full radiography on the shell Category A and B joints and RT1 required marking. The notes also record that the shop hydrotest is based on UG-99(b), the brittle-fracture provision of UG-99(h) is met at 70 F, and wind, seismic, support, operating-weight, and test-weight load cases were included where applicable.
The main chamber is registered exactly at the design pressure, 1405 psi at 158 F. For the primary pressure parts, the corroded required thicknesses shown in the calculation are 2.5875 in for the 72 in cylindrical shell and head straight flange under Appendix 1-1, and 2.4951 in for the 72 in 2:1 semi-ellipsoidal heads under Appendix 1-4(c).
The 24 in boot components rate above the vessel MAWP, so they do not govern the chamber pressure rating. The boot shell with repad is listed at 1444.21 psi MAWP, the boot straight flange at 2171.17 psi, and the 24 in boot head at 2075.84 psi.
The main shell, heads, and boot pressure parts are SA-516-70. Flanged nozzles include SA-105 forged components and SA-106 Grade B seamless pipe necks on several Class 600 weld-neck nozzles, with one SA-234 WPB long-radius elbow in the 3 in branch assembly.
The nozzle schedule lists a 20 in Class 600 head nozzle, two 8 in Class 600 shell nozzles, one 4 in Class 600 shell nozzle, one 3 in Class 600 shell nozzle, three 2 in Class 600 hillside shell nozzles, one 2 in Class 600 shell nozzle, one 2 in Class 600 boot-shell nozzle, and one 3 in Class 600 boot-head nozzle. The vessel weight summary records 4006 US gal new capacity, 57,529 lb empty new weight, 80,510 lb operating new weight, and 91,472 lb test new weight.
The registered file includes internal-pressure thickness checks for cylindrical shells and straight flanges under Appendix 1-1 and formed 2:1 semi-ellipsoidal heads under Appendix 1-4(c). Opening reinforcement is checked under UG-37 with reinforcement limits under UG-40 and weld-failure-path review under UG-41 where applicable.
Nozzle minimum neck thickness is checked under UG-45, weld sizing is checked under UW-16, and local external nozzle load checks are included for selected nozzles using WRC Bulletin 107 in the registered calculation. MDMT and impact-test treatment follow UCS-66 and UG-84 for the carbon-steel pressure parts, and hydrotest checks follow UG-99(b) with brittle-fracture confirmation under UG-99(h).
The 72 in OD shell is shown with a corroded required thickness of 2.5875 in at 1406.53 psi and 158 F, using outside-radius cylindrical-shell pressure calculation form with 0.125 in corrosion allowance.
t = P R / (S E - 0.40 P) + c t = (1406.53 x 36) / (20000 x 1.00 - 0.40 x 1406.53) + 0.125 t = 2.5875 in
The 72 in OD 2:1 semi-ellipsoidal heads are listed with corroded required thickness of 2.4951 in at the design condition. The registered file also shows the head factor K calculated at about 0.9951 in the corroded condition.
t = P D K / (2 S E - 0.2 P K) + c K = (1 / 6) [ 2 + (D / 2h)^2 ] For the registered head geometry, K = 0.9951 t = (1406.53 x 72 x 0.9951) / (2 x 20000 x 1.00 - 0.2 x 1406.53 x 0.9951) + 0.125 t = 2.4951 in
The 24 in boot opening through the 72 in shell uses a 1.00 in wall with a 2.75 in x 9.5 in reinforcing pad. The registered area-replacement summary shows required reinforcement area of 54.7937 in² and available area of 57.9987 in², so the opening is adequately reinforced at the design condition.
A_{required} = d t_r F + 2 t_n t_r F (1 - f_{r1})
A_{required} = 54.7937 in^2
A_{available} = A_1 + A_2 + A_3 + A_{welds} = 57.9987 in^2
A_{available} > A_{required}, therefore reinforcement is adequate.
The shop test basis is recorded as 1.3 times MAWP at 70 F. With MAWP of 1405 psi and governing stress ratio of 1.0, the calculated shop hydrotest pressure is 1826.5 psi, before local static-head adjustments shown for individual components.
P_{test} = 1.3 imes MAWP imes LSR
P_{test} = 1.3 imes 1405 imes 1.0
P_{test} = 1826.5 ext{ psi}
This vessel page adds a higher-pressure horizontal vessel to the public library and gives buyers, engineers, and AI assistants a registered reference with dimensions, code path, materials, hydrotest basis, and worked calculations in one place. It also shows a vessel with a booted side opening and several flanged nozzles, which is more informative than a basic shell-only example.
APEGA Permit 15926. Calc file reference: 072_1405_0125_+158_-20_H1 Rev. 0.