Dürr Universal Silencers
Pressure Vessels & Code Silencers
ASME Section VIII Div. 1 · U & UM Stamp · 15 to 3,000 PSIG · Carbon Steel & Stainless Steel
3,800+
U/UM Stamped Vessels
60+
Years ASME Experience
15–3,000
PSIG Range
U · UM · CRN
Code Stamps Available
Dürr Universal Silencers has a long history of providing pressure vessels for a wide range of industrial, power generation, and oil and gas applications. Made in Stoughton, Wisconsin, Dürr Universal Silencers's pressure vessels and code silencers are manufactured and designed to meet ASME standards for fabricated metallic pressure vessels. To date, Dürr Universal Silencers has provided more than 3,800 U or UM vessels stamped to ASME Section VIII Div. 1.
Pressure vessels and code silencers can handle operating pressures ranging from 15 to 3,000 PSIG and are capable of handling hazardous or flammable gases. They are recommended for applications with vacuum exceeding 20 inches of mercury. Any non-code cylindrical industrial silencer can be modified to a code design — contact NCI to discuss upgrading an existing silencer specification to ASME code construction.
Specifications
Materials of Construction
Standard material for most industrial applications. Cost-effective for non-corrosive services. Available in various ASME-approved grades.
Typical service: Air, nitrogen, steam, non-corrosive gases
General-purpose austenitic stainless steel. Good corrosion resistance for most industrial environments. Suitable for food-grade and pharmaceutical applications.
Typical service: Mildly corrosive gases, food/pharma, outdoor service
Higher corrosion resistance than 304SS due to molybdenum content. Preferred for chloride environments and more aggressive chemical service.
Typical service: Chloride environments, chemical service, marine
Low-carbon variants of 304 and 316. Preferred when welding is required to minimize sensitization and intergranular corrosion. Same corrosion resistance as standard grades.
Typical service: Welded assemblies, corrosive service requiring weld integrity
Additional ASME-approved materials available on request including duplex stainless steel, Hastelloy, and other alloys for specialized applications.
Typical service: Highly corrosive, high-temperature, or specialty gas service
Code Silencer vs. Standard Silencer
When operating pressure, hazardous gas service, or jurisdictional requirements demand it, a code silencer (ASME U or UM stamp) provides the documentation, inspection, and pressure rating assurance that a standard industrial silencer cannot. Any Dürr Universal Silencers cylindrical silencer can be specified as a code vessel.
| Aspect | Code Vessel (U/UM Stamp) | Standard (Non-Code) |
|---|---|---|
| ASME Stamp | U or UM stamp — jurisdictionally accepted | No stamp — may not be accepted in all jurisdictions |
| Design Calculations | Full ASME Section VIII Div. 1 calculations | Engineering calculations may not be to ASME standard |
| Material Certification | ASME-certified materials with mill test reports | Material certification may not be to ASME standard |
| Third-Party Inspection | Required — ASME Authorized Inspector | Not required |
| Hydrostatic Test | Required per ASME code | May or may not be performed |
| Data Report | ASME Form U-1 / U-1A provided | No formal data report |
| Pressure Rating | MAWP stamped on nameplate | No stamped MAWP |
| Hazardous Gas Service | Accepted for hazardous and flammable gases | Not recommended for hazardous gas service |
| Insurance / Regulatory | Accepted by most insurers and jurisdictions | May not be accepted by insurers or AHJ |
Design & Manufacturing Features
Pressure Vessel Design Calculations
Full ASME Section VIII Div. 1 design calculations performed and documented for every vessel.
Certified Vessel Material
All pressure-containing materials are certified to ASME material specifications with mill test reports.
2:1 Elliptical or High-Crown Heads
Preferred head geometry for optimal stress distribution and pressure rating. Provides better performance than flat or standard dished heads.
Forced Flanges
Flanged connections are designed and fabricated to ASME B16.5 or B16.47 standards for reliable, leak-free connections.
Inspection Openings
Required inspection openings provided per ASME code to allow internal inspection and maintenance access.
Traveler Form Documentation
Complete fabrication traveler form tracks all materials, operations, inspections, and test results through the manufacturing process.
Hydrostatic Test
Every vessel is hydrostatically tested to 1.3× MAWP per ASME code requirements. Vessels confirmed to be leak-free before shipment.
ASME Data Report
Manufacturer's Data Report (Form U-1 or U-1A) provided with every U-stamped vessel. Available for customer records and jurisdictional filing.
Third-Party Authorized Inspection
All U-stamped vessels are inspected by an ASME-authorized inspection agency (AI) independent of the manufacturer.
Low- and High-Temperature Ratings
Available upon request for cryogenic, refrigeration, or elevated-temperature service.
Why Choose Dürr Universal Silencers
Quick Fabrication
Streamlined manufacturing processes and in-house capabilities enable shorter lead times than many ASME code vessel fabricators.
Qualified Welders & Procedures
All welders are qualified to ASME Section IX. Welding procedures are qualified and documented. Consistent, repeatable weld quality.
Adequate Material Thickness
Vessels are designed with correct material properties and wall thickness per ASME code — no under-designed vessels.
Better Head Stress Distribution
2:1 elliptical heads provide superior stress distribution compared to flat or standard dished heads, improving fatigue life and pressure rating.
Advanced Flange Strength
Flanged connections designed for full pressure rating with adequate bolt load and gasket seating stress.
Vessel Condition Monitoring
Design provisions for corrosion allowance and inspection access support long-term vessel condition monitoring programs.
Material & Welder Traceability
Complete traceability from raw material mill certificates through finished vessel. Welder identification recorded on all welds.
Leak-Free Confirmation
Hydrostatic testing confirms every vessel is leak-free before shipment. No field leaks on delivery.
Documented Materials & Construction
Complete documentation package including material certifications, weld records, inspection reports, and ASME data report.
Independent Third-Party Inspection
ASME Authorized Inspection Agency (AIA) provides independent oversight — not an in-house inspector.
Common Applications
Blower Silencers
ASME code silencers for positive displacement and centrifugal blowers where operating pressure or hazardous gas service requires code construction.
Compressor Silencers
Inlet and discharge silencers for reciprocating, rotary screw, and centrifugal compressors. High-pressure service to 3,000 PSIG.
Vacuum Pump Silencers
Code vessels for vacuum pump inlet and discharge service. Rated for vacuum exceeding 20 in. Hg.
Pressure-Reduction Valves
Vessels used as inlet or outlet chambers for pressure-reducing valve (PRV) stations.
In-Line Filters
Pressure vessel shells used as housings for in-line coalescing, particulate, and liquid-gas separation filters.
Industrial Process Systems
Custom pressure vessels for industrial process applications including separators, accumulators, and surge tanks.
Power Generation
Vessels for gas turbine, steam turbine, and combined-cycle power plant auxiliary systems.
Oil & Gas
Pressure vessels for upstream, midstream, and downstream oil and gas applications including hazardous and flammable gas service.
Manufacturing Locations
Dürr Universal Silencers's primary pressure vessel manufacturing facility is located in Stoughton, Wisconsin, USA. A dedicated pressure vessel manufacturing facility in India provides additional capacity. Third-party authorized subcontractor partners also manufacture pressure vessels, including Canadian Registration Number (CRN) units for use in Canada. All facilities operate under Dürr Universal Silencers's ASME quality program.
Request a Quotation
Contact Northeast Controls Inc. for pressure vessel and code silencer pricing. To expedite your quotation, please provide: operating pressure (PSIG), operating temperature (°F), gas or fluid type, connection sizes and ratings, and any special requirements (CRN, low/high temperature, special materials).
1-201-419-6111 · [email protected]
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