Pressure vessels & tanks, certified to handle the pressure.
Custom design and fabrication to ASME Section VIII, Division 1 — from U-stamped pressure vessels to large-diameter storage tanks and full process towers, all built in-house by certified specialists.
ASME pressure vessel fabrication by certified specialists.
Harris Thermal is an ASME U- and R-stamp certified pressure vessel manufacturer in Newberg, Oregon, fabricating custom vessels, storage tanks and process towers since 1885. Our knowledge and expertise allow us to custom design and fabricate vessels that comply with all standards of Section VIII, Division 1, of the ASME code.
Our facility is set up for heavy-wall and large-diameter fabrication, with North Bay lift capacity up to 200,000 lb. Tanks can be built to ASME code or non-code, work under atmospheric pressure, and handle a range of non-corrosive and corrosive liquids.
- ASME Section VIII, Div 1 compliant
- U & R stamp certified shop
- Heavy-wall & large-diameter work
- Code or non-code construction
- Corrosive & non-corrosive service
- Custom internals & platforms
Vessels, tanks, and towers for every service.
Each build is engineered for your specific site conditions, mechanical requirements, and process chemistry.
ASME Pressure Vessels
Custom vessels that comply with all standards of ASME Section VIII, Division 1, produced by certified specialists to the most stringent specifications — for process duty across every industry we serve.
Storage Tanks
Single-walled, double-walled, vertical, and horizontal storage tanks — built to ASME code or non-code, operating under atmospheric pressure, and designed for corrosive or non-corrosive liquids.
Columns & Towers
Process towers, columns, and contactors for upstream and downstream applications — fractionating towers, distillation columns, and vapor recovery towers, with internals designed for your site conditions.
Not sure what your project requires?
Our Industry Insights team breaks down the standards so you can spec with confidence — or just send us your conditions and we'll walk you through it.
Built on our floor. Proven in the field.
Custom Pressure Vessel
Completed Vessel for Shipment
On the Shop Floor
20ft OD Stainless-Steel Tank — Custom Fit with Ladders, Platforms & Internals
20ft OD Stainless-Steel Tanks — 3 Identical Tanks Delivered On Time
Large Vessel Fabrication
Precision Components
Fabrication Detail
Ready for Delivery
Pressure Vessel & Tank FAQs
What does the ASME U stamp mean on a pressure vessel?
The U stamp certifies that a vessel was designed, fabricated, inspected, and tested in accordance with ASME Section VIII, Division 1, under a quality program audited by ASME, with an Authorized Inspector signing off. Harris Thermal holds the U stamp for new vessels and the R stamp for repairs and alterations.
When is an ASME code pressure vessel required?
In general, vessels operating above 15 psi are subject to ASME Boiler and Pressure Vessel Code requirements in most U.S. jurisdictions. Storage tanks at atmospheric pressure typically fall under API 620/650 instead. Requirements vary by state and application — our quality team can help you determine what your jurisdiction requires.
What is the difference between a pressure vessel and a storage tank?
A pressure vessel is designed to contain fluids above 15 psi and falls under ASME Section VIII; a storage tank operates at or near atmospheric pressure and is typically built to API 620 or API 650. Harris Thermal fabricates both, including single-walled, double-walled, vertical, and horizontal tanks.
How large a pressure vessel can you fabricate?
Our Newberg, Oregon facility is built for large-diameter, heavy-wall work: North Bay lift capacity up to 200,000 lb, 30 ft × 60 ft bay doors, and machining up to 16.5 ft in diameter. We have shipped 20 ft OD stainless steel tanks. The practical limit on any given project is usually the combination of diameter, wall thickness, lift and transport rather than a single published weight — send the geometry and we will tell you directly whether it fits.
Can you build vessels for corrosive or lethal service?
Yes. We fabricate in duplex, high-nickel alloys, titanium, and zirconium for corrosive service, and provide Lethal Service and Cyclic Service designs per ASME Section VIII, Division 1, including fatigue life and weld integrity analysis.
Can Harris Thermal provide specialty coatings and tank linings?
Yes, where the project calls for it. Protective coatings and linings are incorporated into the scope of supply and applied by qualified third-party applicators we coordinate, rather than in our own shop, so the finished vessel arrives ready for service. Systems we have coordinated include specialty protective coatings, two-part urethane systems, and potable-water linings, including work specified to require NACE-qualified application or inspection. Which system is appropriate depends on the service, the substrate and the specification — send the coating spec with the vessel requirements and we will confirm what can be included.
Do you ship pressure vessels nationwide?
Yes — worldwide. Our shipping department coordinates each shipment with the appropriate carriers and project stakeholders, planning around equipment dimensions, shipping weight, and site access. Vessels are loaded in our yard with a 75-ton gantry crane, and we have shipped by truck and barge, including nitrogen purging and shrink wrapping for transport or long-term storage.
Ready to spec your vessel or tank?
Send us your service conditions and our engineers will design a pressure vessel, tank, or tower optimized for your application, timeline, and budget.