Dry gas seals

 

Product	Description
SGDU 210	Compact dry gas seal
SGDU 220	Dry gas seal with zero speed lift-off and diamond coated faces
Control panels	Control panels (seal systems) - supply gas, often N2 (Nitrogen), and ensure stable operation of the gas seals. If other than N2 gas is used as barrier gas, it should be filtered and condensate should be removed.

See also:

• Photos of dry gas seals, control panels, and test rig
•  Full product line catalog (PDF file, 1.66 Mb)

 

Use of dry gas seals in centrifugal compressors has increased a lot during the last 20 years because these seals provide many benefits for the end user. These seals can handle high speed high pressure applications and, as in dry gas seals lubricating oil is not used, it can no longer contaminate the process.

All newly manufactured dry gas seals are run on test rigs at working parameters as well as beyond them (speed). The procedure is as per API 617 Standard. TREM Engineering welcomes its customers to visit the facility for a witnessed test.

With compressors at the GAZPROM’s natural gas pipeline transportation and distribution network in mind, TREM Engineering has designed two series of dry gas seals:

1. SGDU 210 Gas Seal – for compressors NC-16 series (16 MW) – a compact gas seal with traditional carbon vs tungsten carbide faces. This seal line is usually recommended for compressors at oil refineries and petrochemical plants.
2. SGDU 220 Gas Seal – for compressors PCL 804 series – a gas seal with diamond coated silicon carbide faces with varying depth of grooves.

In addition to complete new seals and control systems, a package to upgrade a compressor from "wet" oil seals to dry gas seals is available. In this very popular package, besides seals, engineering, control panels and necessary new parts are included.

 

The following compressor sealing products are manufactured:

Tandem seal, with additional labyrinth seal or without it

Double seal, with additional labyrinth seal or without it

Triple seal for extra clean processes (combination of tandem and double seals so that nitrogen does not get into the process, but the process gas does not get into the bearing / shop atmosphere as well)

Single seal

Rigid radial and thrust bearings (useful when upgrading from oil mechanical seals)

Control panels, Emerson (Fisher/Rosemount) based (useful when upgrading from oil mechanical seals or for supply to OEM).

In addition, nitrogen generation, air supply systems and temperature & vibration monitoring systems can be offered.

 

The following projects were implemented in recent years:

 

2008-2009: Complete compressor sealing systems (upgrade from wet seals to dry gas seals) at

 

Oil refinery at Angarsk Petrochemicals (Rosneft), Russia

Angarsk Polymer Plant (Rosneft), Russia

Atyrau oil refinery (KazMunayGas oil company), Kazakhstan.

 

2009: Dry gas seals to replace original seals at

 

TAIF-NK Oil Refinery, Russia.

 

2007 and before: Complete compressor sealing systems (upgrade from wet seals to dry gas seals) at

 

Syzran Oil Refinery, Russia

Omsk Oil Refinery, Russia

Mozyr Oil Refinery, Byelorussia.

 

2007 and before: Dry gas seals to replace original seals at

 

Omsk Oil Refinery, Russia

Nizhnekamsk Oil Refinery, Russia

Gazprom’s Zavolzhskaya natural gas transfer station

Rosneft - Komsomolsk Oil Refinery.

 

A number of other manufacturers’ dry gas seals has been repaired (the list available upon request).