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Durable Steel Solutions for Onshore 
Oil & Gas, Refinery and Petrochemical Projects.

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Oil and Gas Steel Structure

Oil and gas facilities operate at the intersection of extreme mechanical loads, aggressive chemical environments, and zero tolerance safety standards. Every structural steel component — from a pipe rack supporting 200 tons of process piping to a flare stack exposed to H₂S, CO₂, and continuous thermal cycling — must perform reliably across a 25-to-30-year facility service life with minimal maintenance access.

Winture fabricates structural steel for onshore oilfields, refineries, LNG terminals, and petrochemical plants. Our scope covers pipe racks, flare stacks, equipment support frames, pump station platforms, offshore trestle structures, and custom skid frames — all from high-strength steel selected and processed to API, ASME, AISC, EN, and GB standards. All surfaces are blast-cleaned to Sa 2.5 before applying multi-layer coating systems engineered to the specific corrosion class of each project zone. Complete fabrication, industrial coating, and export packaging are delivered from a single facility — one point of accountability for your structural package.
 

Learn More

01

Product Scope — What We Fabricate

Winture provides a full range of structural steel for the oil and gas industry.

Each product type has distinct structural loading characteristics, corrosion exposure requirements, and fabrication standards.

Pipe Rack

Multi-tier structural frames supporting process piping runs between equipment items. Pipe racks are among the most structurally complex elements in a process plant: they carry distributed dead loads from pipe weight and contents, dynamic loads from thermal expansion and water hammer, wind lateral loads, and occasional seismic forces — all simultaneously.

 

Multi-level bay design, typically 3–6 tiers at 1.0–1.5m vertical spacing

Main bays from 6m to 12m span with intermediate support frames

Pipe support shoes, guide clips, and anchor clips fabricated and welded

All welding to AWS D1.1 or ISO 3834 Class II procedures

Material: Q355B, Q420B, ASTM A36, A572 Gr.50 per AISC or EN 10025

Flare Stack

Self-supporting or guyed lattice steel stacks for combustion of process waste gas. Structural design accounts for full dead weight of the stack and flare tip, wind load across the full height, thermal gradient from the flare tip, and vibration from vortex shedding at high wind speeds.

 

Heights from 20m to 80m, self-supporting or guyed configurations

Structural design per API 650 / ASME STS-1 / local standard

Flame impingement protection: refractory lining or sacrificial steel sections at tip zone

Coating system: appropriate to H₂S and elevated temperature exposure at base

Access platforms and climbing systems with fall arrest rails integrated

Equipment Support Frame

Custom-engineered structural frames for skid-mounted pressure vessels, heat exchangers, compressors, and pumps. Frames are fabricated to equipment supplier-provided base plate drawings and anchor bolt templates, ensuring dimensional accuracy for bolted equipment installation without on-site modification.

 

Material: Q355B / ASTM A36 / S355JR per client specification

Welding: AWS D1.1 or ISO 3834 Class II, with full documentation

Skid base plate leveling pads and grout pockets pre-installed

Full dimensional inspection report with every frame

Pump Station Platform & Maintenance Platform

Structural steel platforms providing personnel access to equipment at elevation. Designed for combined live load (5 kN/m² personnel), equipment maintenance loads, and dynamic loads from pump vibration.

 

Open grating or chequer plate floor panels

Stair, ladder, and handrail systems fabricated in-house to OSHA / EN 14122 standards

Hot-dip galvanized or painted to match facility coating specification

Offshore Supporting Structure & Trestle

Structural steel frames and trestles for offshore facility access bridges, jetty approach structures, and marine-side support platforms. Designed for combined wave, wind, and current lateral loads with C5-M corrosion exposure as the baseline.

 

All structural steel HDG ≥85μm + heavy-duty topcoat system

Marine-grade bolt and fastener specification

Cathodic protection connection points pre-installed
 

Steel Frame for Refinery & Petrochemical Plant

Multi-story structural steel frames for process building enclosures, compressor shelter frames, and control room structures within refinery boundaries. Designed to local seismic zone and wind speed design parameters.

02

Product Features

Parameter

Specification

Material Grades

Q355B, Q420B (GB/T 1591); ASTM A36, A572 Gr.50/Gr.65 (ASTM); S355JR (EN 10025)

Design Standards

API 650, ASME STS-1, AISC 360, EN 1993, GB 50017

Welding Standards

AWS D1.1, ISO 3834 Class II

Surface Preparation

Abrasive blasting to Sa 2.5 (ISO 8501-1)

Coating System

See table below

Dimensional Inspection

Full dimensional check per fabrication drawing; report provided

Design Service Life

25-30 years (project-specific)

03

Corrosion Protection System

All oil and gas steel structures are blast-cleaned to Sa 2.5 per ISO 8501-1 before coating application.

Coating system selection is based on project corrosivity class and service environment.

What is Sa 2.5 and why does it matter ?

Service Environment

Surface Prep

Layer 1 - Primer

Layer 2 - Intermediate

Layer 3 - Topcoat

Total DFT

General onshore

Sa 2.5

70um Epoxy zinc-rich

80um Epoxy intermediate

40um PU topcoat

>200um

Severe (coastal/H₂S/chemical)

Sa 2.5

80um Inorganic zinc

120-150um Epoxy glass flake

50-60um Fluorocarbon

>280um

Offshore/ marine

Sa 2.5

HDG >85um (ISO1461)

Heavy-duty glass flake coat

-

>200um total

Elevated temperature zones(flare tip area)

Sa 2.5

High-temp aluminum -silicone primer (to 600℃)

-

High-temp topcoat

Per project spec

04

Product Highlights

Complete Fabrication, Coating, and Packaging from One Facility

Structural fabrication, industrial blast cleaning, multi-layer coating application, dimensional inspection, and export packaging are all performed at Winture's facility — one supplier, one point of accountability, one documentation package. No sub-contracting of critical coating work to third parties with inconsistent quality systems.

High-Strength Structural Steel — Multiple Grade Options

Primary structural steel is selected from Q355B, Q420B (GB/T 700/1591), ASTM A36 and A572 Gr.50/Gr.65, and S355JR (EN 10025) — covering the full range of international project specifications. Material selection is documented in the project-specific IQC inspection plan with MTC verification on every incoming batch.

Sa 2.5 Blast Cleaning — The Right Foundation for Every Coating System

All surfaces are abrasive-blast-cleaned to Sa 2.5 per ISO 8501-1 before any coating is applied. Sa 2.5 removes all scale, rust, and contamination to a near-white metal surface, achieving the surface anchor profile (Rz 40–70μm) required for epoxy and zinc-rich primer adhesion. Skipping Sa 2.5 is the single most common cause of premature coating failure in oil and gas environments.

What is Sa 2.5 and why does it matter?

Strict Welding Quality Control — AWS D1.1 / ISO 3834 Class II

All load-bearing welds are performed by qualified welders to AWS D1.1 or ISO 3834 Class II procedures. Weld joint design, pre-heat requirements, and post-weld heat treatment (where specified) are documented in the welding procedure specification (WPS). NDE (visual inspection, MT or PT, and UT where specified) is applied per the project quality plan.

Full-Cycle Quality Assurance — IQC to OQC

Every oil and gas structure component passes Winture's four-stage PDCA quality loop: IQC: Chemical composition and mechanical property verification on all incoming structural steel IPQC: Dimensional checks, weld inspection, and blast/coating thickness monitoring during fabrication Trial Assembly: Main structural frames pre-assembled for dimensional verification before coating FQC: Final coating DFT measurement, surface inspection, and dimensional sign-off OQC: Pre-shipment documentation compilation and packaging inspection

Multi-Standard Engineering Compliance

Structural designs are reviewed and documented against the applicable project standard — AISC 360, EN 1993, GB 50017, API 650, ASME STS-1, or combinations required by international EPC contractors. Winture does not limit compliance to a single standard system.

Suitable for Onshore, Offshore, and Petrochemical Applications

From simple equipment pad frames for onshore oilfield pump stations to multi-level process pipe rack structures for refinery expansion projects, Winture's fabrication scope and quality system cover the full range of oil and gas structural steel applications.

05

Quality Management

Every transmission tower component passes Winture's full-cycle PDCA quality loop, with specific inspection checkpoints at each production stage:

IQC

MTC verification:

chemical, mechanical, coating

IPQC

dimension, surface, welding

Trial Assembly

FQC

galvanizing thickness,  surface

OQC

packing, documentation

Click IQC / IPQC / FQC / OQC to review the specific inspection parameters and acceptance criteria at each stage.

06

Manufacturing Capability

Winture holds ISO 9001, ISO 14001, and ISO 45001 certifications. Power tower production equipment:

 

Equipment

Quantity

High-Speed CNC Production Machines

8 sets

Angle Cutting Machines

1 set

Angle Adjustment Machines

1 set

Bending Machines

1 set

Hot-Dip Galvanizing Lines

2 sets

30,000 MT Monthly production capacity

Explore full manufacturing capabilities

07

Package & Shipment

Bundling

Structural members sorted and bundled by piece mark and member type using steel strip banding.

Coating protection:

All coated surfaces protected with temporary coating wrap or foam padding at contact points during bundling and container loading.

Mark-coded bundles:

Every bundle labeled with piece mark, member designation, weight, and destination matching the fabrication drawing and packing list.

Pallet packaging:

Smaller sections and fastener packages palletized and stretch-wrapped for container stability.

Container loading

Optimized for 20ft and 40ft standard containers; loading plans with center-of-gravity data provided for each shipment.

08

ISO‑Certified Laboratory

 

All structural steel undergoes systematic laboratory testing covering chemical composition, mechanical properties (including impact toughness for low‑temperature service), coating thickness (DFT), adhesion, and salt spray resistance — from incoming material to finished product.

 

Explore our ISO‑certified Lab →Download Sample Test Reports ↓

09

Why Choose Winture for Communication Towers?

Complete fabrication, coating, and packaging from one facility:

Structural fabrication, Sa 2.5 blast cleaning, multilayer industrial coating, trial assembly, dimensional inspection, and export packaging — all under one roof, one quality system, and one documentation package.

High structural strength and compliance:

Q355B / Q420B / ASTM A572 Gr.50/Gr.65 / S355JR material options covering all major international project specs, with full MTC verification on every incoming batch.

Excellent anti-corrosion performance:

Sa 2.5 blast preparation standard and project-specific coating systems from ≥200μm (general) to ≥280μm (H₂S / coastal) DFT, with in-house application and DFT verification.

Strict welding and dimensional control:

AWS D1.1 / ISO 3834 Class II qualified welding procedures, WPS documentation, and trial assembly dimensional verification before coating.

Full 100% quality traceability:

IQC → IPQC → FQC → OQC documentation with every shipment, backed by our ISO certified in-house laboratory. MTC, welding records, coating inspection reports, and dimensional sign-off provided as standard.

Highly competitive factory-direct pricing:

In-house fabrication, blast cleaning, coating, and packaging eliminate intermediary costs and coordination risk across your structural steel supply chain.

Suitable for onshore, offshore, and petrochemical applications:

From oilfield pump station frames to refinery pipe racks and marine trestle structures — one supplier across your full structural scope.

On-time delivery guaranteed:

Optimized production and coating scheduling ensures committed lead times are met, supporting EPC project milestone schedules.

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