Certifications and Compliance

ASME U stamp and National Board registration, 84 third-party engineering reports, six Canadian CRNs, and the seven-step process behind every vessel we build.

We hold the stamp and we weld the vessel.

DocumentCertifications

CodeASME BPVC VIII, Div 1

Revision2026.1

Issued17 September 2026

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 builtStainless, across the life of the shop

84Engineering reportsThird-party reviewed and PE stamped

UASME U stampReinstatement expected early 2027

ASME AND THE NATIONAL BOARD

Code of construction	ASME Boiler and Pressure Vessel Code, Section VIII, Division 1
Certification	ASME U stamp, certificate reinstatement expected early 2027. 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, CRN Registration

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. The same inspector often wants the relief device stamped too, which is the Generant RVA on a 1/2 inch port and the Conrader SRV530 teed off the 3/4 inch top cap.

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, including the single barrel compact
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 (93°C)
Vessel MDMT	-155°F (-104°C)
Vessel hydrostatic test	325 psi at 70°F (21°C)
Jacket MAWP	100 psi at 200°F (93°C)
Jacket hydrostatic test	130 psi at 70°F (21°C)
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

01Material in, traceable. Mill test reports on file against heat number for every plate, pipe and fitting that goes into a code vessel.
02Welded in house. Not subcontracted, not bought in. Our own welders, qualified to Section IX, on our own procedures.
03Inspected. By a third-party Authorized Inspector from Hartford Steam Boiler, to our controlled Quality Control Manual.
04Hydrostatically tested. At 1.3 times MAWP. A 250 psi vessel is tested to 325 psi and the result is documented.
05Passivated and finished. Every weld cleaned and passivated before the vessel leaves the shop.
06Nameplated and registered. Serial number stamped, data report filed with the National Board.
07Checked against a ship list. Every system ships against a documented pre-delivery checklist.

What to buy for this

Hydrocarbon solvent tanksThe 100 LB tank from the worked example, also in 50 and 75 LB.

Coded relief valve, 1/2 inchCoded relief for 1/2 inch ports, 22 and 100 psi settings.

High flow relief valve, 250 psiHigh flow relief for the largest vessels, set at 250 psi.

Need it built to your drawing? Request a quote

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.