Export Guide

KOGAS GSM-2101 Piping Material Standard: What Indian Exporters Need to Know

By Ragnar Metals & Tubes Engineering Team • October 14, 2026 • 7 min read

KOGAS GSM-2101 is the Korea Gas Corporation's internal piping material specification governing all piping installed in its LNG import terminals and transmission pipelines. If you are an Indian manufacturer targeting South Korean LNG infrastructure projects, understanding GSM-2101 is the difference between winning and losing that enquiry.

What Is KOGAS and Why Does GSM-2101 Exist?

Korea Gas Corporation (KOGAS) operates South Korea's national LNG import, storage, and distribution network. With four major LNG receiving terminals at Incheon, Pyeongtaek, Tongyeong, and Samcheok, KOGAS manages cryogenic piping at temperatures down to -162°C. GSM-2101 is the in-house standard that specifies exactly which materials, tests, and certifications are acceptable across these assets. Unlike a generic ASTM or ASME standard, GSM-2101 is project-specific to KOGAS infrastructure — compliance cannot be assumed; it must be documented.

Material Scope of GSM-2101

GSM-2101 covers a defined list of piping materials for different service environments. Key approved materials and their ASTM equivalents are:

What KGS Documentation Means

Many GSM-2101 submittals require KGS (Korean Gas Safety Corporation) approval — this is the regulatory body under South Korea's Ministry of Trade, Industry and Energy that certifies materials used in high-pressure gas systems. For Indian exporters, this typically means:

• EN 10204 Type 3.1 Mill Test Certificate — signed by an independent inspector (SGS, BV, TUV, Intertek)
• KS (Korean Industrial Standards) compliance documentation where referenced
• Third-party impact test reports at -196°C for cryogenic service grades
• Positive Material Identification (PMI) reports per lot, confirming chemistry vs. certified heat analysis
• Hydrostatic test certificates per ASME B31.3 requirements

Cryogenic Grades: TP316L vs. TP304L for LNG Service

For LNG in direct contact with piping metal, TP316L is the default GSM-2101 choice due to its higher molybdenum content providing additional protection against chloride-bearing condensation during re-gasification.

Duplex Steel in KOGAS Seawater Systems

KOGAS terminals use large volumes of seawater for open-rack vaporizers (ORV) and forced-air vaporizers (FAV) cooling systems. These seawater circuits use duplex stainless steel S31803/S32205 (PREN > 34) to resist pitting corrosion from ambient seawater at the port locations. Ragnar Metals supplies ASTM A790 duplex pipe and A182 Grade F51 flanges that meet these requirements with full 3.1 MTC documentation.

How Indian Exporters Should Package a KOGAS Submission

1. Confirm the applicable GSM-2101 revision with the South Korean EPC (Hyundai Engineering, GS Engineering, Samsung C&T)
2. Pre-qualify your mill — KOGAS EPCs typically require ISO 9001:2015 certificate and past supply references for Korean projects
3. Prepare dual-language documentation — technical specs in English with Korean translation for KGS submission
4. Arrange third-party inspection — BV, SGS, or Intertek inspectors at your mill before dispatch
5. Cryogenic impact testing — Charpy V-notch at -196°C for all cryogenic-service lots

Related pages: Exporter to South Korea • Stainless Steel Pipe • Duplex Steel Pipe