INDUSTRY COMPONENT

Seal System

High-pressure sealing system for centrifugal compressors in ammonia synthesis loops

Component Specifications

Definition
A specialized sealing system designed to prevent gas leakage in high-pressure centrifugal compressors used within ammonia synthesis loops, operating under extreme pressures (typically 150-300 bar) and temperatures (150-300°C) while handling corrosive ammonia-hydrogen-nitrogen mixtures. The system maintains pressure differentials between process gas and atmosphere/lube oil systems.
Working Principle
Utilizes multiple sealing technologies including dry gas seals (primary), labyrinth seals (secondary), and buffer gas systems. Dry gas seals operate on non-contacting face technology where a micro-thin gas film (typically nitrogen or process gas) creates separation between rotating and stationary faces. Buffer gas systems maintain pressure differentials to prevent process gas contamination of lube oil.
Materials
Primary seal faces: Silicon carbide or tungsten carbide with diamond-like carbon coating. Secondary seals: Perfluoroelastomer (FFKM) or high-grade fluoroelastomer (FKM). Housing: ASTM A351 CF8M stainless steel. Springs: Inconel 718. O-rings: FFKM or Kalrez.
Technical Parameters
ParameterTypical rangeNotes & selection driver
SpeedUp to 15,000 rpm
Leakage Rate< 0.5 Nm³/h
Shaft Diameter100-300 mm
Pressure RatingUp to 350 bar
Temperature Range-40°C to 350°C
Buffer Gas Pressure1.5-2.0 bar above process pressure

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 10438, API 617, DIN EN 12560

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Buffer gas supply failure
  • Seal face contamination
  • Thermal shock during startups
  • Corrosion from ammonia-moisture mixtures
  • High-speed rotational instability
FMEA Triads
Trigger: Buffer gas supply interruption
Failure: Process gas leaks into bearing housing
Mitigation: Dual redundant buffer gas systems with pressure monitoring and automatic shutdown
Trigger: Solid particle ingress
Failure: Seal face scoring and increased leakage
Mitigation: Install 3-micron filtration systems and regular gas quality monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Face flatness within 0.6 microns, surface finish Ra < 0.05 microns
Test Method
Helium leak testing per ISO 10438, pressure decay testing, dynamic performance testing at operating conditions

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 Seal System

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Shanghai IVEN Pharmatech Engineering Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

Why are dry gas seals preferred over oil seals in ammonia compressors?

Dry gas seals eliminate oil contamination risks in ammonia process, reduce maintenance, handle higher pressures, and provide lower leakage rates compared to traditional oil seals.

What buffer gas is typically used in ammonia compressor seals?

Nitrogen is the standard buffer gas as it's inert, prevents ammonia decomposition, and maintains proper pressure differentials. Some systems use processed synthesis gas.

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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