Pressure Vessel Repair

NES is a certified Pressure Vessel Repair Shop.

Our representative projects include:

  • Qualified in obtaining/reviewing calculations for purposes of re-rating & altering pressure vessels
  • Qualified in weld repairs of corroded pressure vessels
  • Qualified and successful in routine repair of pressure vessels including nozzle replacement
  • Responsible for registering all pressure vessel repairs/alterations with the National Board

Repairs are required for pressure vessels in order to restore its original / intended operating condition, safe operation and to prolong trouble free service life. The vessel condition deteriorate due to various factors mainly Mechanical Problems, Process Related Problems and Corrosion Problems. Repairs are required to be planned and carried out under the strict supervision and control of a competent Inspector. NES not only has competent Inspectors, we have a catalog of specialized Welding procedure qualifications and expert welders to get the job done correctly the first time.

NES Pressure Vessel Repair involves the following important steps for successful repairs:

Decision making for the repairs depending on location and nature of defect within the pressure vessel as per ASME as well as API 510 code

Method of "Half bead technique"

Proper Welding procedure qualifications

NDT that can be employed before, during and after welding

Sufficient Materials and Welding consumables to be used for procedure qualification

Necessity of PWHT and Hydrostatic tests

Requirements and limitations of controlled deposition welding as an alternative to PWHT, or where Impact testing is a requirement

Repairs and precautions during overlay weld repairs

Using preheating methods where Impact testing is not a requirement

Methods and precautions to be taken during alterations and re-rating of pressure vessels

Method of "Temper bead techniques"

Aspects of reporting and re-inspection