Every credential on this page comes with a number you can verify and a person or procedure behind it. Here is what each one means, what a customer audit finds, and the records we can provide when your spec or purchase order calls for them.
Credentials at a Glance
Every credential below comes with a number you can verify and a person or procedure behind it.
ASME U Stamp · #63199
Manufacture of ASME BPVC Section VIII, Division 1 pressure vessels carrying the Single Certification Mark, with hold points witnessed by our Hartford Steam Boiler Authorized Inspector. Oak Harbor shop.
ASME PP Stamp · #63198
Shop fabrication and assembly of pressure piping under the same code program. Oak Harbor shop only. No field code fabrication, no R stamp, no S stamp.
ISO 9001:2015 · #00157-4
Certified by AVU Registrations, Inc. (IAS accredited, MSCB-102). A quality system held through recurring third-party surveillance audits, not a one-time award.
AWS D1.1 · D1.6 · ASME IX
Weld procedures qualified to AWS D1.1, AWS D1.6, and ASME BPVC Section IX (2025 edition), with 60+ AWS-certified welders performance-qualified to the procedures they run.
CWI on Staff
A Certified Welding Inspector reviews procedures, monitors in-process work, and inspects welds against code acceptance criteria before release.
ASNT Level III NDE
Nondestructive examination under an ASNT SNT-TC-1A Level III: VT, PT, MT, and UT performed in-house per the method your drawing calls out, with radiography (RT) coordinated through a qualified NDE partner.
ASME U and PP Stamps: Code Vessels and Pressure Piping
| Certificate Detail | U Stamp | PP Stamp |
|---|---|---|
| Certificate of Authorization | #63199 | #63198 |
| Scope | Manufacture of pressure vessels | Fabrication and assembly of pressure piping |
| Location | Oak Harbor, Ohio shop only | Oak Harbor, Ohio shop only |
| Authorized | May 7, 2026 | May 7, 2026 |
| Expires | May 7, 2029 | May 7, 2029 |
| Certificate holder | The Northern Manufacturing Company | The Northern Manufacturing Company |
| Authorized Inspection Agency | Hartford Steam Boiler (HSB) | Hartford Steam Boiler (HSB) |
The U stamp authorizes Northern to manufacture ASME BPVC Section VIII, Division 1 pressure vessels carrying the ASME Single Certification Mark: fabrication to the code, hold points witnessed by our Authorized Inspector from Hartford Steam Boiler, hydrostatic testing, and a signed Manufacturer’s Data Report as the Code requires. The PP stamp covers shop fabrication and assembly of pressure piping under the same program.
Both certificates apply to our Oak Harbor location only, so field code fabrication is outside their scope. Northern does not hold the R stamp (repairs and alterations) or the S stamp (power boilers). If your job needs a code vessel or a code piping spool built and documented in one shop, send the spec and we will quote it under the stamp.
ISO 9001:2015: Audited Process Control
| Certificate Detail | Value |
|---|---|
| Registrar | AVU Registrations, Inc. (IAS accredited, MSCB-102) |
| Certificate number | 00157-4 |
| Scope | Manufacture and distribution of fabricated metal parts and assemblies |
| First registered | July 2015 |
| Current cycle | Through July 19, 2027 |
An ISO 9001:2015 certificate is maintained through recurring third-party surveillance audits, not a one-time award. For your supplier qualification process, that means:
- Fewer deviations from spec, which reduces your receiving-inspection burden
- A registrar-verified audit trail your quality team can check directly with AVU Registrations
- Controlled work instructions, weld procedures, and inspection plans, current at every workstation
- A formal nonconformance and corrective action process with root cause analysis when something does go wrong
Northern is also registered in SAM for federally funded work (CAGE code 137T8).
Welding Codes: AWS D1.1, AWS D1.6, and ASME Section IX
Weld procedure specifications (WPS) and procedure qualification records (PQR) are tested and qualified to AWS D1.1 (Structural Welding, Steel), AWS D1.6 (Structural Welding, Stainless Steel), and ASME BPVC Section IX, with our Section IX file current to the 2025 code edition. AWS D1.6 is the primary code for our stainless fabrication.
Procedures are only half of it. Our 60+ AWS-certified welders are performance-qualified to the specific procedures they run, with continuity logs tracked so qualifications stay current. When your spec calls out a code weld, the welder holding the torch is qualified to that procedure and we can document it.
Section IX groups base metals by P-number so one procedure qualification covers a family of alloys. Our qualified range runs from P1 carbon steel through P8 austenitic stainless, P10H duplex, and the P43 and P45 nickel alloy families, plus qualified dissimilar-metal combinations. The full table is on our welding services page.
Section IX is the welding qualification backbone behind our code work. Since May 2026 Northern also holds the ASME U stamp (Certificate #63199) and the ASME PP stamp (Certificate #63198), both detailed above, so pressure vessels and pressure piping carry the Code mark out of our shop. We still claim only what we hold: no R stamp, no S stamp, and no field code fabrication.
Certified Welding Inspector (CWI) on Staff
A Certified Welding Inspector (AWS CWI) on staff oversees the welding program: reviewing procedures, monitoring in-process work, and inspecting welds against AWS D1.6 and ASME Section IX acceptance criteria before release. That oversight catches problems at fit-up, when they are cheap to fix, instead of at your receiving dock.
ASNT SNT-TC-1A Level III NDE
Nondestructive examination runs under an ASNT SNT-TC-1A Level III, who develops and qualifies our NDT procedures and certifies our Level II inspection personnel. Visual (VT), dye penetrant (PT), ultrasonic (UT), and magnetic particle (MT) examination are performed in-house per the method your drawing calls out, and radiography (RT) is coordinated through a qualified NDE partner.
Material verification starts at receiving. Handheld XRF analyzers confirm alloy composition through positive material identification (PMI), and heat numbers are tracked from mill test report through cutting and welding to the finished assembly. Corrosion resistance is restored as a fabrication step, not assumed: in-house pickling and passivation per ASTM A380 and A967 in our 55-foot booth removes free iron and weld heat tint before parts ship.
That index is from a real project: the sections it lists, from welder qualifications and dye penetrant results to mill test records and the Certificate of Compliance, were built to that customer’s specification and purchase order. If your project needs proof before you commit, request a redacted sample dossier: real excerpts from project records showing the objective quality evidence (OQE) we deliver with the work. Prefer to talk it through first? Call an engineer at (419) 898-2821.