Home > Welded Pipes > Refinery & Petrochemical Applications
Refineries and petrochemical complexes operate some of the harshest and most demanding process environments in the industrial world. Their pipelines must transport hydrocarbons, hydrogen-rich gases, corrosive fluids, high-temperature vapors, reformer outputs, cracking unit effluent, ammonia, solvents, acids, and feedstocks—often under elevated temperature, pressure, and continuous cyclic service.
Welded pipes manufactured to A312 (Stainless Steel Welded), A358 (Electric Fusion Welded Stainless), and B619 (Nickel Alloy Welded) are engineered for these conditions. These pipes offer:
These materials form the backbone of critical refinery piping, such as heater lines, column circuits, reformer units, cracking sections, and corrosive fluid handling pipelines.
Refinery & petrochemical plants expose pipelines to:
Therefore, pipeline materials must be able to withstand:
✔ High corrosion stress
✔ High-temperature creep & oxidation
✔ Thermal shock
✔ Stress corrosion cracking (SCC)
✔ Hydrogen embrittlement
✔ Severe process environment variability
A312, A358, and B619 welded pipes provide the right metallurgical strength for refinery environments.
Refinery and petrochemical pipelines need:
A312/A358 stainless and B619 nickel alloy welded pipes excel in handling chemical-rich, high-temperature, and corrosive refinery environments.
These welded pipes are extensively used in:
Refineries and petrochemical plants rely on these materials for continuous, safe operation.
These welded pipes are used wherever pipelines encounter chemicals, heat, high flow velocity, or corrosive process media.
| Service Area | Typical Media | Recommended Standard | Purpose |
|---|---|---|---|
| Heater & Furnace Piping | Hot hydrocarbon vapor | A312 / A358 | High-temp corrosion resistance |
| Reformer Feed/Outlet Lines | Hydrogen-rich gases | B619 | Hydrogen attack & corrosion control |
| FCC Unit Piping | Cracked hydrocarbons | A312 | Abrasion & corrosion protection |
| Distillation Column Lines | Hot feed & reflux | A312 | Clean flow under thermal cycles |
| Sour Gas & Amine Units | H₂S-rich gas, amine | A358 / B619 | Stress corrosion resistance |
| Hydrocracker Units | High-pressure hydrogen | B619 | High-temp hydrogen service |
| Petrochemical Lines | Olefins, aromatics | A312 / B619 | Chemical compatibility |
| Acid / Solvent Transfer Lines | Chemicals, acids | B619 | High corrosion resistance |
Heater, Furnace & Hot Vapor Lines
A312/A358 stainless welded pipes are used to carry hot hydrocarbon vapors in refinery furnace and heater sections.
They provide:
Reformer Feed & Outlet Piping (Hydrogen Service)
B619 nickel alloy welded pipes are ideal for:
They resist hydrogen embrittlement & high-temperature corrosion.
FCC / Petrochemical Cracking Lines
Fluid catalytic cracking systems handle cracked hydrocarbons with high velocity.
A312 welded pipes withstand:
Distillation Tower Piping (Hot Hydrocarbons)
A312 welded pipes are used for:
They maintain clean, corrosion-resistant flow surfaces.
Sour Gas & Amine Treating Units
A358 stainless and B619 nickel alloy pipes handle:
High resistance to stress corrosion cracking (SCC).
Hydrocracker & Hydrotreating Units
These units require materials capable of:
B619 welded pipes deliver superior metallurgical reliability.
Petrochemical Feed Lines (Olefin & Aromatics)
Used for chemicals such as:
A312/B619 ensure corrosion-free, clean flow.
Acid & Solvent Transfer Pipelines
Nickel alloy B619 welded pipes are widely used for:
They offer exceptional corrosion resistance.
| Industry | Application |
|---|---|
| Refineries | Heater lines, cracking units, reformers |
| Petrochemicals | Olefin & aromatic processing |
| Chemicals | Acid & solvent pipelines |
| Gas Processing | Sour gas & amine lines |
| Fertilizer Plants | Hydrogen feed & reforming |
| Hydrogen Units | H₂ distribution lines |
| Polymer & Plastic Units | High-purity chemical transfer |
Need welded pipes for refinery & petrochemical applications?
✔ High-corrosion & high-temp materials
✔ Stainless + nickel alloy options
✔ Project documentation support
✔ Export-ready supply
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in, steel@inoxsteelindia.in
+91 9930796690
They resist high-temperature corrosion, H₂S attack, SCC, and chemical exposure.
Yes — B619 is widely used in hydrogen-rich environments.
Sour gas, amine units, heater lines, and high-corrosion refinery circuits.
Yes — they are engineered to withstand high temperature + chemical attack.
Applications of stainless steel and nickel alloy welded pipes in refinery and petrochemical high-corrosion, high-temperature environments.