Project details
- Type of Works: Pressure Vessels
- Project Name: Chromoly Reactor
Our client utilizes a proprietary process to remove impurities from used lubricating oils. Once the impurities are removed, the recycled oils are ready to be resold for use in vehicles and industrial applications. One of their reactor vessels used in the process had worn out and they came to us looking for a replacement. They needed the replacement to last 30 years under extreme conditions. We provided a chromoly reactor, certified for service at 800°F at over 1,300 PSI. Completed, the vessel was 14′ long with a diameter of 4′ and weighed approximately 13,000 lbs. The nature of welding chromoly requires a high level of expertise and strict adherence to procedure.
Welding chromoly requires preheating to ~400°F. Failure to adequately preheat can increase to the likelihood of cracking.
The vessel required both preheating (prior to welding) and post weld heat treatment. Once we completed welding and non-destructive examination (NDE) of the 1½” thick vessel, we added insulation, stainless cladding and shipped it to our client. We look forward to building this vessel’s replacement in kind, circa 2044.
High-temperature industrial processes require equipment that does not compromise on structural integrity.
Enermax specializes in the fabrication of heavy-wall reactor vessels using chromium-molybdenum (Cr-Mo) alloy steels. These units are engineered specifically for high-pressure environments where standard carbon steel would fail due to heat or chemical attack.
Why Choose Chromoly Steel for Reactor Vessels?
Selecting the right material is the most critical step in reactor design. Chromoly steel is the widely used for high-temperature, high-pressure refinery and petrochemical applications for several reasons:
Superior Strength at High Temperatures
Unlike standard metals, chromoly maintains its structural integrity under extreme heat. It features low creep deformation, meaning the vessel will not permanently stretch or weaken under sustained stress over time.
Enhanced Resistance to Hydrogen and Sulfidation
Chromoly is ideal for hydrogen-rich or corrosive chemical environments. The alloy composition improves resistance to hydrogen attack and sulfidation when properly specified, heat-treated, and designed for service conditions, which are common causes of failure in refinery and petrochemical settings.
Extended Service Life
The specific chemistry of Cr-Mo alloys improves fatigue resistance. This leads to a longer lifespan for your equipment, even when subjected to frequent thermal cycling and high-pressure duty.
Applications of Chromoly Reactors in Industry
These vessels are the workhorses of the energy and chemical sectors. We fabricate chromoly steel reactors for a variety of specialized uses:
- Refinery & Petrochemical: Hydroprocessing units and high-pressure catalytic reactors.
- Oil & Gas Processing: Heavy-wall reactors designed for upstream and midstream separation.
- Hydrogen Service: Vessels specifically treated to handle hydrogen at high temperatures.
- Chemical Production: Industrial reaction systems managing aggressive chemical catalysts.
Enermax Chromoly Reactor Design & Fabrication Features
Heavy-Wall Alloy Steel Construction
We work with specialized chromoly grades, including 2.25Cr-1Mo and 1.25Cr-0.5Mo. These materials are selected based on your specific temperature and pressure requirements to ensure maximum safety and durability.
Precision Welding & Metallurgical Integrity
Cr-Mo materials require sophisticated handling. Our fabrication process includes:
- Advanced Welding: Specialized techniques tailored to alloy steel properties.
- Controlled Heat Treatment: Precise pre-heat and post-weld heat treatment (PWHT) procedures to ensure the metal remains ductile and strong.
- Non-Destructive Examination (NDE): Full RT (Radiographic) and UT (Ultrasonic) testing on all full-pen welds, verified to meet code and inspection acceptance criteria.
High-Temperature & Corrosion-Resistant Design
Our reactors are built to thrive in harsh process environments. The design focuses on resisting oxidation and chemical corrosion while managing the stresses of constant thermal expansion and contraction.
Compliance & Quality Assurance
Safety is our baseline. Every chromoly pressure vessel is fabricated to meet ASME Section VIII, Div. 1 requirements. As an ASME-certified shop, we provide complete documentation packages, including hydrotesting results and detailed inspection reports.
Why Choose Enermax for Chromoly Reactor Projects?
Proven Alloy-Steel Fabrication Expertise
Working with chromoly requires more than just standard welding skills. It demands a deep understanding of metallurgy and heat control. Enermax has a proven track record of handling complex alloy steel projects, from forming and welding to final heat treating and inspection.
Engineering for Harsh Environments
We understand the challenges of operating high-pressure reactors in demanding industrial settings. Our team ensures that every vessel is not just a piece of equipment, but a long-term solution built to your exact process specifications.
Contact Enermax for Chromoly Pressure Vessels Today
Ready to discuss your next high-temperature reactor project? Our engineering team is available to help you navigate material selection, design compliance, and custom fabrication needs, so reach out to us today.
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