Stainless Steel (304, 316, 321, 347) Polyurethane Insulated Pressure Vessels
Stainless steel polyurethane insulated pressure vessels combine the corrosion resistance and hygienic properties of austenitic stainless steels with the thermal efficiency of polyurethane foam insulation. These vessels are fabricated from 304, 316, 321, and 347 grades to provide optimal performance in corrosive environments and sanitary applications.
Why Choose Stainless Steel (304, 316, 321, 347) for Polyurethane Insulated Pressure Vessels?
Stainless steel construction is essential for applications involving corrosive chemicals, sanitary requirements, or high-temperature oxidizing environments. The combination of stainless steel’s corrosion resistance with polyurethane insulation’s thermal performance creates ideal vessels for pharmaceutical, food and beverage, and chemical processing applications.
Stainless Steel (304, 316, 321, 347) Polyurethane Insulated Pressure Vessel Applications
Common applications include:
- Pharmaceutical manufacturing
- Food and beverage processing
- Chemical processing with corrosive media
- Sanitary and hygienic applications
- High-purity water systems
- Oxidizing acid service
Stainless Steel (304, 316, 321, 347) Specifications and Characteristics
At Roben, Mfg, Inc., we offer comprehensive options including:
- 304/304L – General purpose, good corrosion resistance
- 316/316L – Enhanced chloride and acid resistance
- 321 – Titanium stabilized for high-temperature service
- 347 – Columbium stabilized for high-temperature service
- Surface finishes from #4 polish to electropolish
Certifications and Standards
Our polyurethane insulated pressure vessels are designed and manufactured in accordance with stringent industry standards:
- ASME Section VIII Division 1 & 2: Pressure vessel design and fabrication standards
- ASME Section IX: Welding procedures and qualifications
- NBIC: National Board Inspection Code compliance
- CRN: Canadian Registration Number for Canadian installations
- PED: Pressure Equipment Directive for European Union market
- U Stamp & R Stamp: ASME certification for new construction and repairs
Stainless Steel (304, 316, 321, 347) Polyurethane Insulated Pressure Vessel FAQs
When should 316 stainless steel be specified over 304?
316 stainless steel should be specified when chloride exposure is expected, for marine environments, or when handling acids such as sulfuric or phosphoric acid. The molybdenum content in 316 provides superior pitting and crevice corrosion resistance. 316L (low carbon) is preferred when welding is required to prevent sensitization.
What surface finishes are available for stainless steel vessels?
We offer a complete range of surface finishes including mill finish, #4 mechanical polish (180 grit), sanitary finish (Ra 20-32 microinch), and electropolish (Ra < 15 microinch). The optimal finish depends on your cleaning requirements, product contact considerations, and regulatory requirements.
What is the difference between 321 and 347 stainless steel?
Both 321 and 347 are stabilized grades designed for high-temperature service where sensitization is a concern. 321 is stabilized with titanium while 347 is stabilized with columbium (niobium). 347 is generally preferred for welded construction as the stabilizing element is less prone to loss during welding.
Contact Roben, Mfg, Inc.
For more information about our polyurethane insulated pressure vessel solutions or to request a quote, please contact Roben, Mfg, Inc. today. Our experienced engineering team is ready to assist you in developing the perfect solution for your unique application requirements.
Phone: (732) 364-6000 | Email: sales@robenmfg.com
760 Vassar Ave, Lakewood, NJ 08701
