Post-Weld Heat Treatment
Gauteng, Mpumalanga & South africa
Post-Weld Heat Treatment
Gauteng, Mpumalanga & South africa
ISO 9001 · ISO 45001 · B-BBEE Level 2 · SAINT Member · ASME Compliant
ISO 9001 · ISO 45001 · B-BBEE Level 2 · SAINT Member · ASME Compliant
PWHT That Satisfies Your AIA – First Time, Every Time
PWHT That Satisfies Your AIA – First Time, Every Time
PWHT That Satisfies Your AIA – First Time, Every Time
PWHT That Satisfies Your AIA – First Time, Every Time
On-site electric resistance and induction heat treatment for pressure vessels, piping systems, and structural welds. ASME Section VIII, B31.1, B31.3 compliant. Serving the Vaal Triangle, Mpumalanga, and greater Gauteng.
On-site electric resistance and induction heat treatment for pressure vessels, piping systems, and structural welds. ASME Section VIII, B31.1, B31.3 compliant. Serving the Vaal Triangle, Mpumalanga, and greater Gauteng.
What Happens When PWHT Is Skipped, or Done Wrong
What Happens When PWHT Is Skipped, or Done Wrong
What Happens When PWHT Is Skipped, or Done Wrong
What Happens When PWHT Is Skipped, or Done Wrong
Welding creates residual tensile stresses approaching the yield strength of the base material and hardened Heat-Affected Zones vulnerable to hydrogen-induced cracking, stress corrosion cracking in amine/caustic/H₂S service, and brittle fracture. These are not theoretical risks – they are the mechanism behind real catastrophic failures in South African pressure equipment.
Under ASME Section VIII Div.1 (UCS-56), PWHT is mandatory for P-No. 1 carbon steels above 38mm wall thickness and for all P-No. 3 materials regardless of thickness. ASME B31.1 and B31.3 add further requirements by P-Number and service class. Skip or under-execute it, and your conformity assessment will fail – your equipment cannot be commissioned.
Improperly documented PWHT records are one of the most common reasons AIA submissions are rejected in South Africa. Glospech's PWHT service provides calibrated thermocouple data, temperature charts, and regulatory documentation that passes first time.
Welding creates residual tensile stresses approaching the yield strength of the base material and hardened Heat-Affected Zones vulnerable to hydrogen-induced cracking, stress corrosion cracking in amine/caustic/H₂S service, and brittle fracture. These are not theoretical risks – they are the mechanism behind real catastrophic failures in South African pressure equipment.
Under ASME Section VIII Div.1 (UCS-56), PWHT is mandatory for P-No. 1 carbon steels above 38mm wall thickness and for all P-No. 3 materials regardless of thickness. ASME B31.1 and B31.3 add further requirements by P-Number and service class. Skip or under-execute it, and your conformity assessment will fail – your equipment cannot be commissioned.
Improperly documented PWHT records are one of the most common reasons AIA submissions are rejected in South Africa. Glospech's PWHT service provides calibrated thermocouple data, temperature charts, and regulatory documentation that passes first time.
On-Site PWHT: Two Methods, One Quality System
On-Site PWHT: Two Methods, One Quality System
On-Site PWHT: Two Methods, One Quality System
Electric Resistance Heating
Flexible ceramic heating pads for complex geometries and dissimilar metal joints
Up to 24 independent control zones for precise gradient management
Accounts for over 90% of field PWHT worldwide
Carbon steel soak range: 593–649°C per ASME P-No. 1 requirements
Calibrated thermocouple placement per ASME code requirements
Induction Heating
Internal electromagnetic heating – significantly faster than resistance for standardised pipe joints
Uniform temperature distribution across wall thickness
Ideal for high-volume piping during plant turnarounds
What PWHT prevents
Hydrogen-induced cracking · Stress corrosion cracking · Brittle fracture · Weld fatigue failure · HAZ hardness exceedance
Applicable codes
ASME Section VIII Div.1 UCS-56 · ASME B31.1 Table 132 · ASME B31.3 Table 331.1.1 · API 577 · SANS 347
Planning a Pressure Vessel Repair or a New Fabrication?
Planning a Pressure Vessel Repair or a New Fabrication?
PWHT must be completed before final AIA inspection. Plan your heat treatment early – hold-point delays caused by late PWHT scheduling are common and entirely avoidable.
PWHT must be completed before final AIA inspection. Plan your heat treatment early – hold-point delays caused by late PWHT scheduling are common and entirely avoidable.
What Makes Glospech PWHT Different
What Makes Glospech PWHT Different
What Makes Glospech PWHT Different
Hardness Verification Included
Pre- and post-PWHT hardness testing confirms HAZ compliance with Brinell and Vickers methods.
Hardness Verification Included
Pre- and post-PWHT hardness testing confirms HAZ compliance with Brinell and Vickers methods.
Hardness Verification Included
Pre- and post-PWHT hardness testing confirms HAZ compliance with Brinell and Vickers methods.
Level III Procedure Authority
Every PWHT procedure is written and approved by an in-house Level III technician – no outsourced sign-off, no delays waiting on a third party.
Level III Procedure Authority
Every PWHT procedure is written and approved by an in-house Level III technician – no outsourced sign-off, no delays waiting on a third party.
Level III Procedure Authority
Every PWHT procedure is written and approved by an in-house Level III technician – no outsourced sign-off, no delays waiting on a third party.
Integrated NDT
Combine PWHT with RT or UT weld inspection in a single mobilisation. One call, one quality system.
Integrated NDT
Combine PWHT with RT or UT weld inspection in a single mobilisation. One call, one quality system.
Integrated NDT
Combine PWHT with RT or UT weld inspection in a single mobilisation. One call, one quality system.
Full Regulatory Documentation
Thermocouple charts, soak time records, cooling rate logs, structured for AIA submission.
Full Regulatory Documentation
Thermocouple charts, soak time records, cooling rate logs, structured for AIA submission.
Full Regulatory Documentation
Thermocouple charts, soak time records, cooling rate logs, structured for AIA submission.
Vaal Triangle Base
Faster mobilisation at lower travel cost than Johannesburg or Pretoria competitors.
Vaal Triangle Base
Faster mobilisation at lower travel cost than Johannesburg or Pretoria competitors.
Vaal Triangle Base
Faster mobilisation at lower travel cost than Johannesburg or Pretoria competitors.
Our People
Our People
Our People
Hands-on technical directors with direct accountability for every inspection.
Hands-on technical directors with direct accountability for every inspection.
RAYMOND JOUBERT
Managing Director & Technical Lead
Raymond holds NDT certifications at Level II/III across multiple methods and carries direct technical authority for inspection procedures, quality control, and AIA coordination at Glospech. He brings hands-on site experience across power generation, petrochemical, and mining environments – and leads all client engagement with engineering and QA/QC teams.
RAYMOND JOUBERT
Managing Director & Technical Lead
Raymond holds NDT certifications at Level II/III across multiple methods and carries direct technical authority for inspection procedures, quality control, and AIA coordination at Glospech. He brings hands-on site experience across power generation, petrochemical, and mining environments – and leads all client engagement with engineering and QA/QC teams.
RAYMOND JOUBERT
Managing Director & Technical Lead
Raymond holds NDT certifications at Level II/III across multiple methods and carries direct technical authority for inspection procedures, quality control, and AIA coordination at Glospech. He brings hands-on site experience across power generation, petrochemical, and mining environments – and leads all client engagement with engineering and QA/QC teams.
RAYMOND JOUBERT
Managing Director &
Technical Lead
Raymond holds NDT certifications at Level II/III across multiple methods and carries direct technical authority for inspection procedures, quality control, and AIA coordination at Glospech. He brings hands-on site experience across power generation, petrochemical, and mining environments – and leads all client engagement with engineering and QA/QC teams.
LOUISE JOUBERT
Director & Operations Manager
Louise manages client relationships, quotation delivery, scheduling, and financial operations. She is Glospech's primary contact for procurement enquiries and ensures every project – from initial scope to final certified report – meets the company's service delivery commitments.
LOUISE JOUBERT
Director & Operations Manager
Louise manages client relationships, quotation delivery, scheduling, and financial operations. She is Glospech's primary contact for procurement enquiries and ensures every project – from initial scope to final certified report – meets the company's service delivery commitments.
LOUISE JOUBERT
Director & Operations Manager
Louise manages client relationships, quotation delivery, scheduling, and financial operations. She is Glospech's primary contact for procurement enquiries and ensures every project – from initial scope to final certified report – meets the company's service delivery commitments.
LOUISE JOUBERT
Director & Operations Manager
Louise manages client relationships, quotation delivery, scheduling, and financial operations. She is Glospech's primary contact for procurement enquiries and ensures every project – from initial scope to final certified report – meets the company's service delivery commitments.
How It Works
How It Works
How It Works
From Scope Confirmation to Compliance Certificate in 4 Steps
From Scope Confirmation to Compliance Certificate in 4 Steps
STEP 1
Scope Review
Confirm P-Number, wall thickness, applicable code, and equipment geometry. Written procedure issued before mobilisation.
STEP 1
Scope Review
Confirm P-Number, wall thickness, applicable code, and equipment geometry. Written procedure issued before mobilisation.
STEP 2
Procedure Development
Level III approved heating procedure specifying soak temperature, heating and cooling rates, and thermocouple placement – per ASME requirements.
STEP 2
Procedure Development
Level III approved heating procedure specifying soak temperature, heating and cooling rates, and thermocouple placement – per ASME requirements.
STEP 2
Procedure Development
Level III approved heating procedure specifying soak temperature, heating and cooling rates, and thermocouple placement – per ASME requirements.
STEP 3
On-Site Execution
Equipment setup, controlled heat cycle, real-time thermocouple monitoring across all active zones.
STEP 3
On-Site Execution
Equipment setup, controlled heat cycle, real-time thermocouple monitoring across all active zones.
STEP 4
Certified Documentation
Full thermocouple chart, hardness test results, soak time record, and compliance report, AIA-ready on completion.
STEP 4
Certified Documentation
Full thermocouple chart, hardness test results, soak time record, and compliance report, AIA-ready on completion.
STEP 4
Certified Documentation
Full thermocouple chart, hardness test results, soak time record, and compliance report, AIA-ready on completion.
STEP 1
Scope Review
Confirm P-Number, wall thickness, applicable code, and equipment geometry. Written procedure issued before mobilisation.
STEP 3
On-Site Execution
Equipment setup, controlled heat cycle, real-time thermocouple monitoring across all active zones.
STEP 2
Procedure Development
Level III approved heating procedure specifying soak temperature, heating and cooling rates, and thermocouple placement – per ASME requirements.
STEP 4
Certified Documentation
Full thermocouple chart, hardness test results, soak time record, and compliance report, AIA-ready on completion.
STEP 1
Scope Review
Confirm P-Number, wall thickness, applicable code, and equipment geometry. Written procedure issued before mobilisation.
STEP 3
On-Site Execution
Equipment setup, controlled heat cycle, real-time thermocouple monitoring across all active zones.
STEP 2
Procedure Development
Level III approved heating procedure specifying soak temperature, heating and cooling rates, and thermocouple placement – per ASME requirements.
STEP 4
Certified Documentation
Full thermocouple chart, hardness test results, soak time record, and compliance report, AIA-ready on completion.
FAQ
FAQ
FAQ
Answers to the Questions Our Clients Ask First
Answers to the Questions Our Clients Ask First
When is PWHT mandatory under ASME Section VIII and B31.3?
What are the consequences of skipping required PWHT?
Do you perform PWHT on-site or only in a workshop?
What temperature monitoring and documentation do you provide?
Can you PWHT Cr-Mo and P91 alloy piping on-site?
Can PWHT be combined with radiographic or ultrasonic inspection in one visit?
What is the lead time to mobilise for shutdown PWHT in Secunda?
Contact Us
Contact Us
Contact Us
Get Your Free NDT Inspection Quote.
Response Within 24 Hours. No Obligation.
Get Your Free NDT Inspection Quote. Response Within 24 Hours. No Obligation.
✓ B-BBEE Level 2 Certified
✓ ISO Triple Certified (9001/14001/45001)
✓ Same-Day Quotations
✓ B-BBEE Level 2 Certified
✓ ISO Triple Certified (9001/14001/45001)
✓ Same-Day Quotations
© 2025 Glospech (Pty) Ltd. All rights reserved
© 2025 Glospech (Pty) Ltd. All rights reserved
