High-Pressure Sour Gas Flow Transition: Haihao Group Dispatches Heavy-Wall Reducers to Iraq
Operating pressure lines across Iraqi oil fields demands piping components capable of handling intense mechanical stresses alongside aggressive hydrogen sulfide (H2S) sour corrosion. Small-bore high-pressure piping systems, in particular, rely on seamless heavy-wall fittings to eliminate localized stress concentrations during fluid throttling. To support an upstream oil and gas development in Iraq, Haihao Group has completed manufacturing, specialized hardness testing, surface passivation, and export dispatch for a consignment of heavy-wall seamless concentric reducers.
Forged and heat-treated strictly to ASME B16.9 and NACE MR0175 / ISO 15156 standards, these fittings utilize high-grade ASTM A234 Grade WPB carbon steel designed for severe Schedule 160 high-pressure manifolds.
ASTM A234 WPB SCH 160 seamless concentric reducer manufactured by Haihao Group
Order Technical Breakdown & Dimensional Matrix
To ensure precise inline flow reduction without creating turbulence in small-diameter high-pressure instrument and injection lines, the shipment includes two critical heavy-wall size configurations:
| Product Type | Size (Large End × Small End) | Wall Thickness / Schedule | Material & Process | Applicable Standards |
| Concentric Reducer | 1” x ¾” (DN25 x DN20) | SCH 160 x SCH 160 | Seamless ASTM A234 WPB | ASME B16.9, NACE MR0175 |
| Concentric Reducer | 1” x ½”(DN25 x DN15) | SCH 160 x SCH 160 | Seamless ASTM A234 WPB | ASME B16.9, NACE MR0175 |
Metallurgical Engineering: Heavy-Wall Seamless Design & NACE Sour Service Defense
Procuring small-bore high-pressure fittings through a certified ASTM A234 WPB seamless reducer manufacturer eliminates the risks of line rupture caused by material laminations or sulfide stress cracking (SSC) in sour hydrocarbon environments.
Haihao Group implemented specialized heat treatment and metallurgical quality controls to guarantee long-term field stability:
Seamless Construction for High Pressure: Both sizes (1” x ¾” and 1” x ½”) are forged from seamless carbon steel pipe to maintain continuous grain flow. The thick Schedule 160 wall profile easily withstands intense line pressure fluctuations without internal material fatigue.
NACE MR0175 Hardness Control: To prevent sulfide stress cracking (H2S embrittlement) typical of Iraqi sour oil fields, the material was normalized and stress-relieved. Hardness levels across both the outer surface and center-wall sections were strictly capped below 22 HRC (237HBW).
Smooth Taper Machining: Internal flow transitions were precision-machined to ensure a uniform centerline taper, minimizing pressure drop and erosion-corrosion along the inner wall reduction zone.
Quality Verification, Surface Treatment & Export Packaging
To maintain our standing as a top-tier ASTM A234 WPB seamless reducer manufacturer, every piece underwent stringent Quality Assurance checks prior to shipment to the Middle East:
Bevel Geometry Inspection: Both ends were CNC-beveled to 37.5° in strict compliance with ASME B16.9 to facilitate immediate, defect-free field welding.
100% Non-Destructive Examination: Magnetic Particle Inspection (MPI) was performed on all outer and bevel surfaces to confirm complete freedom from surface cracks, laps, or forging seams.
Rust Prevention & Bevel Protection: Fittings received a black anti-corrosion coating designed for harsh desert storage conditions, with ends sealed by heavy-duty protective plastic caps.
Certified Documentation Package: Shipped with EN 10204 3.1 Mill Test Certificates documenting chemical heat composition, tensile and yield strength, heat treatment logs, and NACE MR0175 hardness test verification.
Partnering with an experienced ASTM A234 WPB seamless reducer manufacturer ensures smooth project execution, flawless fit-up, and total operational safety for challenging sour gas installations.
Partner with Haihao Group for Middle East Energy Projects
Searching for NACE-compliant heavy-wall carbon steel fittings, Schedule 160 seamless reducers, or custom ASME B16.9 piping components for your oil, gas, and refining assets in Iraq or worldwide? Rely on a trusted ASTM A234 WPB seamless reducer manufacturer. Contact the Haihao Group engineering sales team today for prompt technical guidance and competitive quotations.