Product Design and Analysis
Piping Skid Registrations, ASME B31.3
Piping Skids falling within certain boundaries need to be registered with the local jurisdiction where it will be installed. The following are examples of some piping skids that have been verified by classical ASME B31.3 Code calculations and have been CRN-registered with ABSA for installation in Alberta.
Special thanks to Prominent Fluid Controls Ltd for permission to post these projects.
Prominent Fluid Controls Ltd. supplies both products and systems for Storage, Transfer, Dosing, Measurement and Control of chemicals and water.
Patent obtained for work performed at Trojan Technologies, London, ON
International Patent Number: WO 2007/059609 A1
The complete patent document is available under the above number by following this link: WO 2007/059609. Since the patent covers additional items which I didn't design, I've enclosed a scanned version of the cover and some of the images that summarize the assembly that I directly produced. It is available by clicking the figure below. One feature of note, highlighted on the cover sheet, is that it "obviates or mitigates the need to use adhesive and/or polymer insulation/O-rings to achieve electrical connections." The importance of this statement is brought into focus when one considers the brittle materials involved, quartz and ceramic, the temperature gradient spanned, and the extremely high doses of ultraviolet (UV) light that the components must survive without breaking down or even off-gassing. There are of course many other features that would be fun to discuss here, but likely are categorized as being "proprietary" .
Click on image to retrieve Patent summary images and cover sheet.
- Works in conjunction with a chemical clean-in-place system to remove hardness buildup
and water-borne particulate from the quartz surface.
- Internal springs keep wiper blade in contact with the surface.
- Identical components interlock back-to-back.
- Flexible material resists breakdown due to Ultraviolet irradiation.
The weld shown in Figure 1 failed during a cyclic loading test. The subsequent investigation involved:
1. Weld Examination: The specimen was cut perpendicular to the weld, as shown in Figure 1, to view the weld at different locations. The vessel's shape made it impossible to use NDE methods such as X-Ray. The fracture has been darkened for emphasis.
2. Stress Analysis: The most plausible failure mechanism was determined to be fatigue failure. This conclusion was confirmed by a cycle-life prediction using stress values generated from the FEA (Figure 2)..
3. Physical Testing: Similar vessels were pressure-tested to further confirm the theoretical results found in Step 2.
4. Design Revisions: The proposed design solutions mitigated the effect of cyclic loading.
Figure 1: Weld Examination
Figure 2: Stress Analysis
This brief discussion investigates the central joint of a 12” split-body butterfly valve using Finite Element Analysis (FEA) interpreted per the ASME VIII-2 2007 Code, as permitted by ASME B31.3-2008. The observations are primarily of a qualitative rather than a quantitative nature. Also, this is not a comprehensive report such as is used to submit to a Canadian Jurisdiction for CRN registration. Rather, it illustrates how FEA is used to fill in gaps in the classical ASME Code configurations and how it can replace burst testing for proving an acceptable design pressure.
Click on Images above to open a document discussing this Analysis.
An air receiver can be described as a pressure vessel that acts as a reservoir for receiving and storing a compressed gas, in order to maintain a constant supply. According to the B51 Code, it must be registered with the applicable Canadian Jurisdiction and have the CRN number stamped on its nameplate, if the design pressure is greater than 15 psi. Generally, it is registered as a Pressure Vessel under ASME VIII-1. If the volume is less than 1.5 cu-ft then it is registered as a fitting. See “When is a CRN required” for more information and additional requirements.
Either click on the image to the left or follow the link below to open calculations that are based on CRN-approved submissions.
Calculations: Air Receiver
New Steam Cooker, CRN for British Columbia
Used Steam Cooker, CRN for Ontario
Used Vessel Registration:
Vessel Description: Jacketed Steam Cooker vessel
Manufacturer: Groen Manufacturing
Year of Manufacture: 1966
· Original U-1 Form, with NB registration
· Ultrasonic thickness (UT) testing and Liquid Penetrant (LP) joint quality report
· Pressure Vessel Calculations per ASME VIII-1
· P.Eng. Stamped drawing.
Final inspection by TSSA Authorized Inspector.
Steam Cooker, Registered at BCSA
Dimple Jacket per UW-19, ASME VIII-1
Special thanks to MTC Worldwide for permission to post this project. CRN number has been issued.
MTC Worldwide designs, engineers and manufactures battery changing equipment and food processing equipment for large food processors.
Follow link to MTC Worldwide
Required documentation per
ASME VIII-1, UW-19(b): calculations, geometric restriction, and burst test per UG-101.
Piping Calculations, ASME B31.3
Sample Piping Calculations per ASME B31.3. This represents several different jobs, and the drawing reflects TSSA’s general requirements for a P&ID in order to approve the project and issue the CRN number.
Follow the links to open the files:
Drawing: KEY-026 P&ID
Calculations: KEY-026 Sample P&ID
Sample Pressure Vessel calculations per ASME VIII-1 for a stainless steel filter vessel:
Standard ASME B16.5 rated flange inlet and outlet ports
Top cover attached by means of custom swingbolt assembly.
Used Vessel Registration
Vessel Description: Autoclave used for tire re-treading
Design Code: ASME VIII-1, 1992 ed, 1993 Addenda
Year of Manufacture: 1994
National Board Registration: 19
MAWP: 100 psi @ 500°F
Province of Registration: Ontario
Final inspection by TSSA Authorized Inspector
Special thanks to Ironhead RT for permission to post this project.
Ironhead Rubber Technologies
155 Delta Park Boulevard