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AIS Boiler & Pressure Vessel Inspections

AIS provides boiler inspections and pressure vessel inspections. Our boiler inspectors including pressure vessels inspectors have held National Board of Boiler and Pressure Vessel Commissions and/or an API-510 Certificate. AIS has jurisdictional inspector privileges in some localities in the United States.

Boiler Inspections

  • Boiler  Watertube  including Waste Heat Boilers (HRSG)

  • Firetubes 
  • Hot Oil Transfer Boilers
  • Fluidized Bed Boilers
  • Cast Iron Boilers

Pressure Vessel Inspections

  • DA Tanks

  • Unfired Pressure Vessels
  • Re boilers
  • Air Tanks
  • Dryer Cans and Yankees (Rotating Pressure Vessels Both Steel and Cast Iron
  • Heat Exchangers
  • Process Vessels
  • Digesters - Pulp & Paper and Waste Treatment Plant

Codes for Boiler Inspections & Pressure Vessel Inspections

  • API 510 Pressure Vessels and 653 Tanks
  • NBIC (National Board Inspection Boiler & Pressure Vessel Code)
  • NFPA for Boiler Burner Management
  • Jurisdictional Boiler and Pressure Vessel codes
  • ASME Boiler and Pressure Vessel Codes
 AIS Engineering Inspections can provide:
  • Quality Assurance for Boiler and Pressure Vessel Repairs and Alterations.
  • Boiler Inspections & Pressure Vessel Inspections.
  • Boiler Inspection Consultations including Pressure Vessels
  • Safety Valve and Over pressurization Protection inspections
  • Nondestructive testing
  • Investigation of steam explosions

Whether you have a Watertube Boiler or a Firetube Boiler we have the Boiler Inspection experience.

Whether the work is safety orientated pressure vessel inspections, mechanical integrity, boiler engineering, or boiler consulting, you benefit by having experienced boiler inspectors and boiler engineers who have knowledge and experience with boiler inspections and pressure vessel inspections.   

Benefits of using our Boiler & Pressure Vessel Engineering inspections:

  • Informative & Detailed Documentation for your boiler inspection and pressure vessel inspection  
  • Knowledgeable and Experienced inspectors
  • Boiler Inspections & Pressure Vessel Inspections to Standards
  • Inspections that have Service and Value
  • Code Compliance in all Jurisdictions for your boiler & pressure vessel
  • Professional Engineering Service
  • Extend the services to include NDT for you boilers & pressure vessels
  • Mechanical Integrity Programs for your boiler, pressure vessel, and piping.


What engineering inspections do you need...

Aboveground Storage Tank Inspections

Boilers and Pressure Vessel Inspections

Electrical Testing & Inspection

Engineering Projects & Assistance

Infrared Inspections

Nondestructive Examination NDE NDT

Quality Assurance Service QA

Pressure Vessel Calculation -internal- for thin wall Pressure Vessels

The results are approximate.  An Engineer needs to be consulted in all cases.  Thinned walled pressure vessels 10%r>t.  Material stress value can be found in the International ASME B&PV Code Section 2 based on the rated temperature on nameplate.  A joint efficiency of 1=seamless pipe or radiography of 100%.  To find the joint efficiency review the International ASME B&PV.  The minimum thickness does not consider the corrosion allowance.  The deformation and burst are at best an estimate and are displayed as a teaching tool for carbon steels only where their behaviors are reasonably predictable.  The Deformation is based on the yield strength and the burst is based on the ultimate tensile strength.  Finally, a pressure vessel should be at least 1/4-inch thick regardless of the internal pressure.


Pressure MAWP

Inside Diameter

Stress Value


Joint Efficiency

1.0 - 0.65



Minimum thickness


Deformation thickness


Burst thickness

Consulting in Accidents, Engineering in Boiler & Machinery, and Safety Engineering

Copyright 1998
- 2008 AIS Accident Inspection Specialists, Inc.