Pressure Vessel & Tank Quality Assurance
Steel Tank Quality
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At TIGG, Quality is the key for all of our steel tanks and pressure vessels.  Building on our 35 years of experience in fabricating tanks, we have developed and implemented Quality Assurance Programs that assure our customers of receiving a high quality, enduring product that will provide years of service life.

Welding/Fabrication Certifications

Click Images To View Certificates
R Stamp Certificate U Stamp Certification   ASME U Stamp Certificate
National Board-R Stamp Certificate ASME- U Stamp Certificate of Authorization   ASME-U Stamp Certificate

Steel Tank and Pressure Vessel Standard Quality Procedures:

1. ASME Code vessels are designed, built and tested to comply with the stringent requirements ASME Pressure Vessel Code and are registered with the National Board of Boiler and Pressure Vessel Inspectors.

2. For all non-code liquid tanks, welds are visually examined and tanks are hydrostatically tested to a minimum of 1.3X design pressure

3. For all non-code vapor tanks, welds are visually examined and tanks are air tested to 15 psi.

Code Quality Procedures, NDE:

When code or customer specifications require additional quality control, TIGG employs a third party NDE Level 3 Inspection Company to carry out the following procedures:

  1. Magnetic Particle Examination
  2. Radiographic Examination
  3. Penetrant Examination
  4. Leak testing
  5. Ultrasonic Examination (In House Certified UT Inspector)
  6. Visual Inspection (In House Certified Welding Inspector)

Blasting - Linings - Coatings Quality Assurance
  • Our written Quality Assurance procedures insure the proper application and testing of all internal and external coatings.
  • The tanks are visually inspected for weld quality. If this inspection shows questionable welds, repairs are made and then the tanks are pressure tested.
  • Tanks are then sent to the blast booth where TIGG utilizes a state of the art technology to impart a profile on the steel as required by different linings and coatings. This environmentally friendly process uses recyclable abrasive sponge material to achieve the specified metal profile.
  • Following the blasting, the tanks are cleaned, removing blasting byproducts and particulates remaining on any of the surfaces.
  • The paint department accepts the vessels following the cleaning step after blasting. Tanks are now ready for linings and coatings. The paint department checks the manufacturers specifications against drawing requirements to insure proper application of linings and coatings. During the application a wet film gage is used to aid our applicators in obtaining the proper thickness while spraying. Following the paint operation, a dry film test is checked to verify adequate linings were applied.
  • After the final lining coat is applied and dried properly, a lining test is performed to check for holidays (pinholes) in the lining. These tests are performed using an AP-W high voltage detector or M-1 low voltage holiday detector.
  • If tests indicate a holiday exists, repairs are made and the lining is allowed to cure prior to shipment.
  • All coating details are documented per our Quality Assurance program and filed. (These can be made available to customers upon request.)

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Steel Tank Quality Testing

Exterior Coating
Thickness Testing

Ultrasonic Inspection

Ultrasonic Weld Examination

Tank Lining Spark Test

Tank Lining Spark Test
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