Oil & Gas Transmission

Natural Gas Long-Distance Pipeline — Compressor Station Piping

Turkey, Middle East180+ tons304L / 316L Seamless Stainless Steel Pipe

Stainless steel pipe for gas transmission

Project Background

The Trans-Anatolian Natural Gas Pipeline (TANAP) is a critical section of the Southern Gas Corridor connecting the Caspian Sea to Europe, spanning 1,850 km with an annual capacity of 16 billion m³. Seven compressor stations along the route required instrument air, chemical injection, and utility piping systems capable of withstanding H₂S-rich sour gas environments in compliance with NACE MR0175, with strict demands on delivery schedules and full material traceability.

Technical Specifications

Grade	ASTM A312 TP304L / TP316L (Dual Certified)
Size Range	DN15 – DN600 (1/2" – 24"), SCH 10S / 40S / 80S
Standards	ASTM A312, API 5LC, NACE MR0175/ISO 15156
Documentation	EN 10204 3.1 MTR, PMI per tube, Hydrostatic Test Report

The Challenge

Sour gas environments pose a dual threat of intergranular corrosion and sulfide stress cracking (SSC) to 304/316 austenitic stainless steels. Material hardness must not exceed HRC 22 per NACE MR0175, and carbon content must be strictly controlled.

TOKO TECH Solution

TOKO TECH supplied dual-certified 304L/316L seamless pipes with C ≤ 0.03%, solution-annealed to ensure intergranular corrosion resistance. Each pipe was individually tested for hardness (HRC ≤ 22) and 100% PMI verified, with full EN 10204 3.1 documentation traceable to heat number.

Search Keywords

NACE compliant pipelong-distance pipelinesour gas pipingstainless steel seamless pipecompressor station piping

Frequently Asked Questions

What is NACE MR0175 compliance for stainless steel pipe?

NACE MR0175/ISO 15156 is the international standard for materials used in H₂S-containing environments in oil and gas production. It specifies hardness limits (HRC ≤ 22 for austenitic stainless steels), chemical composition requirements, and heat treatment conditions to prevent sulfide stress cracking.

What is the difference between 304L and 316L for sour service?

316L contains 2-3% molybdenum, providing superior pitting resistance in chloride-containing environments compared to 304L. For sour gas applications with both H₂S and chlorides, 316L is preferred. Both grades require carbon ≤ 0.03% for NACE compliance.

What documentation is required for oil & gas pipeline projects?

Full material traceability is essential. TOKO TECH provides EN 10204 3.1 MTR (Material Test Reports), 100% PMI (Positive Material Identification) per tube, hydrostatic test reports, and NACE MR0175 compliance certificates for every shipment.

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