Certifications and Compliance
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We hold the stamp and we weld the vessel. Most of the companies selling extraction equipment are consultants and resellers who buy vessels in and assemble them. When your AHJ asks a question about a weld, the people who made it answer the phone. This page is the paperwork behind that claim.
| 1,000+ | Pressure vessels built | Stainless, across the life of the shop |
| 84 | Engineering reports | Third-party reviewed and PE stamped |
| U & R | ASME stamps held | Plus National Board registration |
ASME and the National Board
| Code of construction | ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 |
| Certification | ASME U stamp and R stamp holder, and National Board registered |
| Scope | Manufacture of pressure vessels at 61530 American Lane, Bend, Oregon 97702 |
| Authorized Inspection Agency | The Hartford Steam Boiler Inspection and Insurance Company |
| Quality Control Manual | Written to Section VIII Division 1, 2026 edition, controlled and on file with the Authorized Inspector |
| Weld filler | SFA 5.9 / ER308L and ER316L, selected to the base metal. ER308L is 57,000 psi yield, 87,000 psi tensile |
| Base materials | 304, 304L, 316 and 316L stainless, supplied as SA-312, SA-240, SA-403, SA-479 and SA-182, fully traceable by heat number |
| Canadian registration | Six CRNs registered with TSSA Ontario, valid through August 2032. See Selling into Canada |
What the stamp actually means for you
Every pressure vessel is built to code, inspected by a third-party Authorized Inspector, hydrostatically tested, serialized and registered.
Many states require ASME U stamped vessels for hydrocarbon extraction. A non-code vessel can fail an inspection after you have paid for it, installed it and built a room around it.
Serialized production
Every code vessel carries its own nameplate and serial number, and the data report is registered with the National Board. As of mid-2026, 55 vessels carry ASME serial numbers, NBO-1 through NBO-55.
Code vessels are a fraction of the total. The shop has fabricated well over a thousand stainless pressure vessels across its history, code and non-code, for cannabis extraction, pharmaceutical, chemical, and food and beverage customers.
If you own an N.B. Oler vessel, the number on the nameplate is how we find your file.
Third-party engineering certification
Our equipment is peer reviewed and PE stamped by independent engineering firms. We hold 84 engineering certification reports covering the product line, written over the years by several firms including 3P Certz, LLC of Monroe, Washington and PSI, along with other licensed professional engineers.
Reports are available by product line for your Authority Having Jurisdiction. Coverage includes:
| Product line | Coverage |
|---|---|
| 20 LB hydrocarbon extraction system | Multiple configurations and revisions, including a reduced-pressure variant |
| 40 LB hydrocarbon extraction system | Multiple configurations |
| 10 LB hydrocarbon extraction system | Multiple revisions |
| Color remediation columns | 4 inch and 6 inch |
| Falling film evaporator | Full system |
| Drop-in tube-in-shell condenser | Full assembly |
| Solvent tanks | 60 to 75 lb and 100 lb, with design calculations |
| Recovery vessels | 12 inch, with design calculations |
| Ethanol vessels | Multiple sizes |
| Diamond Miner | Multiple sizes and configurations, jacketed and non-jacketed |
| Structural | Catwalk stress analysis |
Tell us your product and your jurisdiction and we will send the report that covers it.
Worked example, the 100 lb solvent tank
So you can see what is actually in one of these reports rather than taking our word for it. From the design calculations for our 100 lb solvent tank, per 2019 ASME BPVC Section VIII Division 1:
| Vessel MAWP | 250 psi at 200 °F |
| Vessel MDMT | -155 °F |
| Vessel hydrostatic test | 325 psi at 70 °F |
| Jacket MAWP | 100 psi at 200 °F |
| Jacket hydrostatic test | 130 psi at 70 °F |
| Corrosion allowance | 0.00 inch, all stainless construction |
What your inspector will ask for
| Certificate of Conformance | What roughly 98 percent of AHJs actually want. Serialized to your individual system, includes site-specific seismic calculations, and references the parent ECR. Issued per system |
| Engineering Certification Report | The parent report for your product line. PE stamped and peer reviewed. Supplied on request |
| Site Installation Report | Available on request |
| Proof of operator training | Signed certificates for every operator who will run the system. Issued at the end of training |
Tell us which of these your jurisdiction requires when you order, not after the inspector is standing in your room. Extra documentation may carry extra fees.
How every vessel is built
- Material in, traceable. Mill test reports on file against heat number for every plate, pipe and fitting that goes into a code vessel.
- Welded in house. Not subcontracted, not bought in. Our own welders, qualified to Section IX, on our own procedures.
- Inspected. By a third-party Authorized Inspector from Hartford Steam Boiler, to our controlled Quality Control Manual.
- Hydrostatically tested. At 1.3 times MAWP. A 250 psi vessel is tested to 325 psi and the result is documented.
- Passivated and finished. Every weld cleaned and passivated before the vessel leaves the shop.
- Nameplated and registered. Serial number stamped, data report filed with the National Board.
- Checked against a ship list. Every system ships against a documented pre-delivery checklist.
Questions about certification for your jurisdiction? Call 541-330-6409, Monday to Thursday, 8 to 4 Pacific. We talk to AHJs regularly and we would rather resolve a question before you order than after.