INDUSTRY COMPONENT

Casing

High-pressure containment structure for centrifugal compressors in ammonia synthesis loops

Component Specifications

Definition
The casing is the primary pressure-retaining component of a centrifugal compressor in high-pressure ammonia synthesis loops, designed to contain the rotating assembly, direct process gas flow through impeller stages, withstand extreme internal pressures (typically 150-350 bar), and provide structural support for bearings and seals while maintaining precise alignment under thermal and mechanical stresses.
Working Principle
Provides a sealed pressure vessel that converts kinetic energy from rotating impellers into pressure energy by containing and directing gas flow through progressively smaller volutes or diffusers, while withstanding cyclic thermal expansion and high-pressure fatigue through engineered stress distribution.
Materials
Forged low-alloy steel (ASTM A350 LF2, A694 F60/F65) with corrosion-resistant cladding (Inconel 625 or 316L stainless steel) on internal surfaces; heat-treated to achieve 450-550 MPa yield strength with Charpy V-notch impact toughness >40J at -46°C.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Leak Rate< 0.1% of volume per hour
Surface FinishRa ≤ 3.2 μm internally
Wall Thickness80-150 mm nominal
Pressure Rating150-350 bar design pressure
Temperature Range-50°C to +200°C
Hydrotest Pressure1.5x design pressure
Dimensional Tolerance±0.1% on bore diameter

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 10440-1, API 617, ASME BPVC Section VIII, DIN EN 13445

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Hydrogen embrittlement in high-pressure service
  • Thermal stress cracking during rapid startups
  • Corrosion under insulation
  • Bolt fatigue in flange connections
  • Erosion at gas inlet areas
FMEA Triads
Trigger: Cyclic pressure and thermal stresses
Failure: Fatigue cracking initiating at stress concentrators
Mitigation: Finite element analysis during design, radius optimization at transitions, post-weld heat treatment, regular ultrasonic inspection
Trigger: Wet ammonia corrosion
Failure: Pitting and stress corrosion cracking
Mitigation: Corrosion-resistant cladding, controlled startup procedures to avoid condensation, online corrosion monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Bore concentricity within 0.05 mm TIR, flange flatness within 0.1 mm/m, wall thickness variation < 5%
Test Method
Hydrostatic pressure testing per ASME BPVC, ultrasonic examination per ASME SA-388, magnetic particle inspection per ASTM E709, dimensional verification with laser scanning

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Casing

Manufacturer profiles associated with Casing.

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Frequently Asked Questions

Why are casings in ammonia compressors typically forged rather than cast?

Forged construction provides superior grain structure, higher fatigue resistance, better mechanical properties at high pressures, and reduced defect probability compared to casting, which is critical for safety in high-pressure hydrogen-containing environments.

What maintenance is required for compressor casings?

Regular non-destructive testing (ultrasonic thickness measurement, dye penetrant inspection), bolt torque verification, corrosion monitoring of internal cladding, and alignment checks during major overhauls every 3-5 years.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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