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ICTD International Centre for Training and Development

Dry Gas Seal Operation, Maintenance, Installation and Commissioning

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Keeping gas compressors running with least troubles and shutdown decreases the downtime of the whole system. Right selection, maintenance, installation and commissioning of sealing systems are very essential for right compressor operation. Dry gas seals are widely used now in different compressor applications. Effective maintenance programs, reliable monitoring system and skilled personnel capable of doing the right installation is essential requirements for prolong seals and compressors life.

All the above can be achieved via deeper understanding of the dry gas seal construction and tolerances, the limits and constrains on their operation, and the more effective controlling methods. This course will offer the opportunity to learn more about dry gas seals, their selection, maintenance, installation and commissioning. During the course participant’s discussion, comments, bringing up their own problems are welcomed and encouraged

Course Objectives

Upon successful completion of this course, the delegates will be able to:

  • Know the different types of compressor seals, their use, proper operation, and performance
  • Understand the basic theory and application of dry gas seals
  • Understand the basic components and construction of dry gas seals
  • Understand requirements to sealing medium, its conditioning and control
  • Learn the basics of operation and maintenance of dry gas seals
  • Understand the best practice of installation and commissioning of dry gas seal

Course Outline

Day 1

  • Compressor principals of operation
  • Axial and Beam style compressors, turbo expanders, centrifugal pumps
  • Pressure / Velocity through compression stage
  • Axial Force, Balance Piston and Bearings
  • Shaft sealing
  • Seal cavity design
  • Seal effects on Rotor dynamics
  • Compressor factory testing
  • Gas seal installation & commissioning
  • Gas seal operation & maintenance
  • API-617 Requirements

Day 2

  • Quality of Sealing Gas - requirements
  • Sources of Sealing gas
  • Gas conditioning
  • Sealing gas controls and monitoring
  • Alarms and Shutdowns
  • API-614 requirements

Day 3

  • Principles of Operation
  • Gas seal overview
  • Gas seal groove patterns
  • Stability of seal gap
  • Axial travel limitations
  • Seal leakage
  • Seal contamination
  • Thermal distortion
  • Materials of Construction
  • Sealing faces
  • Metal adaptive hardware
  • Labyrinth seals
  • Secondary seals

### Day 4

  • Dry Gas Seals Examples of Application
  • Oil and Gas Production On-Shore and Off-Shore
  • Refinery Applications
  • Gas Pipelines
  • Chemicals
  • LNG

Day 5

  • Assessing feasibility of a retrofit
  • Why Rotor dynamics
  • Cavity considerations & Seal selection
  • Compressor modification
  • Tooling
  • Liquid contamination
  • Particulate contamination
  • Incorrect Installation
  • System Failures
  • Case studies / examples
  • Measures to improve DGS reliability

Course Methodology

A variety of methodologies will be used during the course that includes:

  • (30%) Based on Case Studies
  • (30%) Techniques
  • (30%) Role Play
  • (10%) Concepts
  • Pre-test and Post-test
  • Variety of Learning Methods
  • Lectures
  • Case Studies and Self Questionaires
  • Group Work
  • Discussion
  • Presentation

Who should attend

This course is intended for engineers of any discipline, managers, technician, technologists, and other technical personnel involved in compressors operation, selection, maintenance, troubleshooting and control.


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