ASME Pressure Vessels

DNOW has manufactured stand-alone and packaged ASME pressure vessels systems for customers across the globe in many different industries, including water treatment, power generation, energy, and oil and gas. Our reputation as a leading custom steel fabricator was gained by consistently meeting demanding schedules and quality requirements thanks to our experienced fabricators and welders.

ASME Pressure Vessel Fabrication

Every ASME pressure vessel we design conforms to ASME Boiler and Pressure Code for Design, Section VIII. All materials used conform to ASME Boiler and Pressure Vessel Code for Materials, Section II.


ASME Pressure Vessels, Section VIII, Division 1 - U Stamp

Operating at pressures exceeding 15 psig, internal or external - ASME has has different requirements for numerous classes of materials as well as for fabrication methods, including welding, and brazing.


ASME Pressure Vessels, Section VIII, Division 2 - U2 Stamp

Vessels to be installed in a fixed location for a specific service -
Operation and maintenance control should be retained during the useful life of the vessel by the user who prepares or causes to be prepared the design specifications. Requirements under Division 2 for design, materials, and nondestructive examination are more rigorous than Division I.

We give our customers the opportunity to review all ASME pressure vessel designs before we begin procuring material. Once the design has been approved, we quickly begin fabrication. We perform many kinds of welding for ASME pressure vessels, including GTAW, FCAW, GMAW, SAW, and SMAW.


ASME Pressure Vessel Testing and Inspection

Our engineers work closely with our expert drafters to ensure that every ASME pressure vessel that DNOW produces meets industry codes and complies with regulations. If no custom testing has been requested by the customer, a third party certified inspector verifies the product's overall integrity with non-destructive testing (NDT), applies a national board (NB) label, and is registered with the National Board of Boiler and Steel Pressure Vessel Inspectors prior to shipping.


Service Menu

Features & Options

  • Lifting Lugs
  • Inlet Diverter
  • Vortex Breakers
  • Wire Mesh Mist Extractor
  • Level Switch High
  • Vane Mist Extractor
  • Liquid Level Controller(s)
  • Level Gauge(s)
  • Temperature Indicator
  • Control Valve(s)
  • Pressure Indicator
  • Pressure Relief Valve
  • High/Low Pressure Regulator(s)
  • Radiography hydro-mag and particle-dye pen testing
  • FEA (finite element analysis)
  • Optional enclosure for cold weather packages


Vessel lengths 100 ft + 
Diameters  12 ft +
Vessel thickness  5 in + 


TitleFile SizeDownload
Power Service Products & Services Guide 8.7 MB Download