ASME VIII-1 (2023), CRN AA6166.213, Alberta, registered February 2026
This 8 NPS vertical filter vessel is designed for 1,415 psi at 150 °F with a quick-opening Class 600 LF2 closure at the top and a compact skirt support.
The chamber is registered to operate down to -49 °F MDMT, with several LF2 small-bore connections qualified colder by stress-ratio toughness rules.
Reece Custom Manufacturing designed and registered this vessel under APEGA Permit to Practice 15926 using ASME Section VIII Division 1, 2023 Edition, for Alberta CRN AA6166.213.
The 1,415 psi MAWP is a deliberate user cap in the design file, the hydrotest follows UG-99(b) with full vertical liquid head, and skirt and base-ring checks reference NBC 2020 wind at the manufacturer’s location.
AA6166.213 (Alberta)
ASME VIII-1 (2023 Edition)
1,415 psi @ 150 °F
150 °F
-49 °F
-49 °F @ 1,415 psi (chamber)
1,415 psi @ 150 °F (user-limited)
SA-333 Gr 6, 8 NPS Sch 80 pipe
0.0625 in internal (pressure parts)
E = 1.0 (seamless shell, spot RT circumferentials)
313 lb (new)
418 lb (vertical, full of water)
This unit is a small vertical filter vessel with an 8 NPS Sch 80 shell, LF2 threaded and flanged small connections, and a quick-opening 8 in Class 600 LF2 closure at the top supplied under its own CRN.
It is sized for high-pressure gas or liquid filtering service where a compact footprint, cold-weather rating, and rapid cartridge access matter more than internal volume.
The 12 to 13 US gal chamber volume and integral skirt make this a good template for wellsite and plant edge locations where structural steel is limited and utilities are simple.
Two 3 NPS XXS nozzle locations are designed for API 660 Class 600 external loads, giving flexibility for inlet and outlet or drain and header tie-ins without re-opening the registration.
The design is based on ASME Section VIII Division 1, 2023 Edition, in U.S. Customary units, with minimum wall per UG-16(b) set to 0.0938 in plus corrosion allowance.
The vessel is designed for internal pressure only, no external pressure, with UG-22 loadings including internal pressure, vessel and contents weight, skirt reactions, wind, and test pressure with coincident static head.
The design case is 1,415 psi internal pressure at 150 °F, with the chamber MDMT set to -49 °F and the option enabled to limit rated MDMT to the design MDMT even where individual parts qualify lower.
The MAWP is slightly higher than design pressure for most components, but overall MAWP is limited to 1,415 psi by user setting in the calculation file so the registration matches the requested rating.
Radiography is set to RT2 marking under UG-116(e) with seamless cylindrical components and spot RT on circumferential welds per UW-11(a)(5)(b).
No nozzles require full radiography. B16.5 Class 600 flanges on the 3 NPS nozzles are UW-11(a)(4) exempt, and small threaded bosses follow UW-16 sketch details without weld strength checks.
No UG-20(f) exemption is taken. Toughness is established explicitly for all materials.
The 8 NPS Sch 80 shell is SA-333 Gr 6 pipe, 8.625 in OD by 60 in long.
Nominal thickness is 0.500 in, minimum pipe tolerance thickness is 0.4375 in, and the required design thickness for internal pressure plus corrosion by Appendix 1-1 at 150 °F is 0.4085 in.
For the shell, the combined pressure, weight, and wind longitudinal stress check gives a required thickness around 0.189 in corroded, well below the pressure-governed 0.4085 in design thickness, and the computed MAWP at 150 °F is 1,538 psi before the user cap is applied.
The rated MDMT for the shell is -55 °F from UCS-66(i) and UCS-68(b), but the chamber MDMT is set at -49 °F to match the design setting.
The bottom closure is a modified ASME B16.9 pipe cap in SA-420 WPL6 with a short straight flange above it, both matched to the 8.625 in OD shell.
The cap itself has a required design thickness of 0.3887 in with MAWP 1,645 psi via Appendix 1-4(c), while the straight flange has a required thickness of 0.4085 in with MAWP 1,806 psi, so the flange governs both pressure and MDMT for that component.
A support skirt made from 8.625 in SA-333 Gr 6 pipe is 8.375 in tall with a nominal thickness of 0.322 in and joint efficiency 0.55.
Wind and weight combinations give required thicknesses less than 0.01 in for all load cases, so the skirt is governed by fabrication and anchorage rather than pressure-related stresses.
The vessel capacity is about 12 US gal new and 13 US gal corroded, excluding nozzles and attachments, and the operating weight with liquid is approximately 418 lb new.
The new empty lift weight is 313 lb with a center of gravity about 24.6 in above the bottom datum.
The main pressure boundary materials follow the UCS carbon steel path. The shell and the 3 NPS XXS nozzles are SA-333 Gr 6, and the bottom cap and straight flange are SA-420 WPL6.
All small threaded bosses, including 1 in, 2 in, 3/4 in, 1/2 in, and the head connection, are SA-350 LF2 Class 1, consistent with cold-service small-bore practice.
The quick-opening top closure is an 8 in Sch 80 Class 600 device in SA-350 LF2 CL1 with its own CRN 0H04712.213 provided by the closure vendor and referenced in the engineering notes as a supplied component.
Companion flanges on the 3 NPS nozzles are NPS 3 Class 600 weld neck SA-350 LF2 Cl.1, while the 6000-class threaded bosses are designed as plain bosses without separate flanges.
Corrosion allowance on all pressure parts is 0.0625 in on the internal surface, with no external corrosion allowance.
Longitudinal joints are seamless, circumferential seams on shell-to-head and shell-to-flange welds are spot radiographed per UW-11(a)(5)(b), and small-bore boss welds are sized to UW-16 fillet weld sketches with explicit throat checks.
Support components include the SA-333 Gr 6 skirt, a skirt opening in the skirt wall, and an optional base ring sized to transfer overturning and anchor forces under wind.
Inputs: Example 1, shell thickness and MAWP at design conditions.
t = (P · Ro) / (S · E + 0.40 · P) + Corrosion = (1,417.17 · 4.3125) / (17,100 · 1.00 + 0.40 · 1,417.17) + 0.0625 = 0.4085 in
P = (S · E · t) / (Ro - 0.40 · t) - Ps
= (17,100 · 1.00 · (0.5 · 0.875 - 0.0625)) /
(4.3125 - 0.40 · (0.5 · 0.875 - 0.0625)) - 2.17
= 1,538.37 psi
The shell qualifies to -55 °F by the UCS-66(i) and UCS-68(b) path, which is below the chamber design MDMT of -49 °F.
Inputs: Example 2, bottom cap thickness by Appendix 1-4(c).
t = (P · Do · K) / (2 · S · E + 2 · P · (K - 0.1)) + Corrosion
= (1,417.29 · 8.625 · 0.9790) /
(2 · 17,100 · 1 + 2 · 1,417.29 · (0.9790 - 0.1)) + 0.0625
= 0.3887 in
P = (2 · S · E · t) / (K · Do - 2 · t · (K - 0.1)) - Ps = 1,645.18 psi
The straight flange above the cap requires 0.4085 in and therefore governs the bottom-end component rating.
Inputs: Example 3, 3 NPS XXS nozzle reinforcement and local loads.
UG-37 area replacement at 1,416.85 psi A required = 0.8647 in² A available = 1.09 in²
WRC 537 local stress check PL + Pb + Q = 43,021 psi ≤ 51,300 psi PL = 25,087 psi ≤ 25,650 psi
The nozzle is adequately reinforced and remains within the local stress allowables for the applied Class 600 load set.
Inputs: Example 4, shop hydrotest pressure.
Ptest = 1.3 · MAWP · LSR
= 1.3 · 1,415 · 1
= 1,839.5 psi
Including static head, local shop hydrotest pressures are about 1,842 psi, and the chamber minimum recommended test temperature is about -19 °F, which is well below the 70 °F test temperature stated in the file.
This vertical filter vessel shows how Reece Custom Manufacturing registers compact, high-pressure filter shells that use standard 8 in Sch 80 piping, LF2 nozzles, and a quick-opening closure while still meeting 2023 Edition VIII-1 rules for pressure, local loads, and cold-weather toughness.
The file also shows a practical Division 1 pattern that combines UCS-66(i), UCS-66(b)(3), UCS-68(b), and Division 2 Part 4.5 local stress checks inside one registered package.
Permit to Practice: APEGA 15926
Calc file reference: 008_1415_00625_+150_-49_V1 Rev.0