South Korea's major heavy fabricators (HD Hyundai Heavy Industries, Samsung Heavy Industries, Hanwha Ocean, and Doosan Enerbility) produce ASME pressure equipment for export projects. Typical scopes include hydroprocessing reactors, large-diameter pressure vessels, offshore structures, and heat exchangers.
Independent TPI at these facilities is typically a contractual requirement. The purchase order specifies the client's inspection requirements, and third-party inspection verifies those requirements were met, separate from the fabricator's own QC and the authorized inspection agency involved in the ASME stamping process. For a comparison with source inspection in India, see the dedicated guide. For details on the document review stage that precedes all site visits, see the article on the remote document review stage.
Why Source Inspection Is Used in Korea
Korean fabricators build high-spec equipment such as thick-wall hydroprocessing reactors, large-diameter alloy vessels, and offshore structures that require Class Society certification. These scopes require defined hold points and documented inspection.
Korean heavy fabricators maintain qualified welding procedures, heat treatment capabilities, and material handling infrastructure for these applications. They produce equipment to ASME Section VIII Division 1 and Division 2, with some facilities holding Division 3 stamps for high-pressure applications.
The inspection requirement is driven by the purchase order: the client specifies that their inspector must verify hold points, review documentation, and sign off on the pre-shipment release.
The Korean Fabrication Landscape
South Korea's major ASME-authorized pressure equipment fabricators are concentrated in the southern industrial cities.
Korean fabricators generally produce strong documentation and maintain well-controlled welding processes. The inspection focus shifts to verifying that client-specific material grades and filler metal requirements are covered by the procedures in use, not just that the WPS library is large.
| Fabricator | Location | Primary Scope |
|---|---|---|
| HD Hyundai Heavy Industries | Ulsan | Large pressure vessels, offshore structures, heat exchangers |
| Samsung Heavy Industries | Geoje | Offshore structures, process vessels, LNG equipment |
| Hanwha Ocean (formerly DSME) | Geoje | Offshore, process vessels, specialty equipment |
| Doosan Enerbility | Changwon | Power plant, nuclear-grade, high-alloy pressure vessels |
These four fabricators collectively handle the majority of Western oil and gas pressure equipment orders placed in Korea. All four hold ASME U-stamps at minimum; several hold U2 stamps for Division 2 design. All prepare documentation for international orders in English.
What Source Inspection Covers
Source inspection for Korean-fabricated equipment follows an approved Inspection Test Plan (ITP) that defines hold points, witness points, and review activities. The standard scope for a pressure vessel or heat exchanger order includes:
- -WPS and PQR review: Welding procedure specifications and qualification records reviewed against ASME Section IX before production welding begins. For Korean fabricators building to client-specific specifications, this review also checks that the WPS covers the client's specified material grades and filler metals.
- -ITP review and approval: The fabricator's ITP reviewed against the purchase order and applicable codes. Hold point and witness point designations confirmed before fabrication begins.
- -Material traceability verification: MTRs reviewed against the material specification. During the site visit, heat number markings on plate, pipe, and fittings verified against the MTRs before release to fabrication.
- -Dimensional inspection: Critical dimensions checked against the approved drawing at mid-fabrication and pre-shipment: shell dimensions, nozzle orientation and projection, flange face finish and bolt hole orientation, overall length.
- -NDE review and hold point sign-off: NDE procedures and records reviewed for code compliance. Hold point sign-off at specified NDE stages.
- -Pre-shipment inspection: Final check before shipping: nameplate verification, nozzle protection, surface condition, preservation requirements. Shipping release signed.
The Hybrid Remote + Site Visit Model
Full-time on-site presence throughout a Korean fabrication run is rarely required for most equipment. The hybrid model concentrates oversight at the stages where it matters: document review happens remotely before fabrication begins, and focused site visits cover the hold points where physical presence is required.
| Stage | Delivery | Activities |
|---|---|---|
| Stage 1: Pre-Fabrication (Remote) | Remote, document exchange by email or shared folder | ITP review and approval, WPS/PQR review, drawing review, MTR review for ordered material |
| Stage 2: Mid-Fabrication (Site Visit) | On-site at Korean fabrication facility | Material traceability verification, fit-up and dimensional checks, weld quality observation, NDE hold point sign-off |
| Stage 3: Pre-Shipment (Site Visit) | On-site at Korean fabrication facility | Final dimensional inspection, NDE record review, pressure test witnessing (if hold point), nameplate verification, shipping release |
For standard pressure vessels and heat exchangers, two site visits is the typical model. For complex fabrications (thick-wall reactors, alloy vessels, PWHT-required equipment), the hold point structure may require additional visits.
Each stage produces a signed PDF report delivered to the Western client. The complete package constitutes the independent QC record for the equipment.
FAQs
How far in advance should we engage Norman QC for a Korean assignment?
Engage at purchase order confirmation. The pre-fabrication document review stage (WPS/PQR, ITP) needs to be completed before production welding begins. Korean fabricators typically begin material procurement and shop setup within weeks of receiving a purchase order. If the inspector is not engaged until fabrication is underway, the pre-fabrication review window is lost.
Do Korean fabricators cooperate with Western TPI?
Yes. Major Korean fabricators are highly accustomed to Western client TPI. Third-party inspection by the client's representative is a standard requirement on international orders and is expected and accommodated. The purchase order makes TPI access a contractual requirement.
What codes apply to Korean-fabricated pressure vessels for Canadian service?
Pressure vessels destined for Canadian service must be fabricated to ASME Section VIII Division 1 or Division 2, with welding qualified to ASME Section IX. For heat exchangers, TEMA standards apply to mechanical design alongside ASME VIII. Alberta-registered vessels require ABSA approval of the design and the manufacturer's data report (U1 or U1A). Source inspection verifies that the Korean fabricator followed the code the stamp represents.
How is pricing typically structured for Korean source inspection?
A common model is remote document review plus two site visits for a single vessel fabrication assignment. This limits travel days compared to full-time on-site presence and avoids client travel to Korea.
How are reports delivered?
Reports are delivered as signed PDF documents by email within 5 business days of each site visit or document review completion. Each report contains inspection scope performed, hold points completed, dimensional data, photographs, and any non-conformances issued with status. The pre-shipment report includes the shipping release.