EagleBurgmann HRGS-D Gas-Lubricated Double Cartridge Seal

A gas-lubricated double cartridge seal for contact-free operation in pumps

The EagleBurgmann HRGS-D is a gas-lubricated, balanced double seal in cartridge form for pumps handling gases and liquids, including media that contain solids. The two seal pairs run on a gas barrier instead of a liquid film: the standard version has U-grooves (bidirectional) that lift the faces apart, so there is no friction on the faces and no heat generated at the seal or in the medium. EagleBurgmann also lists the principle as self-closing at pressure reversal, so the seal does not open if the buffer gas pressure fails, and the seat rotates in the HR design.

The datasheet gives two main versions. The HRGS-DC fits dimensions according to DIN 24960 C or ANSI Big Bore, and the HRGS-DD corresponds to API 682 configuration 3NC-FB with API Plan 74 for larger shafts or higher pressure. Recommended applications are gases and liquids, media that require high purity and environmentally harmful media, in the chemical industry and refining technology.

Technical specifications

What the gas barrier does and does not do

A gas-lubricated seal needs a gas supply at a pressure above the product pressure and a minimum differential pressure of 3 bar to keep the faces separated; the datasheet gives a maximum differential pressure of 16 bar for internal pressure. The datasheet gives a sliding velocity range of 4 to 25 m/s, so check the shaft speed against it.

Selection and installation notes

Choose the HRGS-D where a liquid-barrier dual seal is not acceptable, for example for high-purity products or where the barrier liquid would contaminate the process, and where a suitable buffer gas supply is available. Check the shaft speed against the 4 to 25 m/s range, the elastomer temperature limit and whether the pump flange dimensions follow DIN 24960 C or ANSI Big Bore. For shafts up to 200 mm or pressures up to 40 bar select the HRGS-DD. The datasheet states that its specifications are guide values and that the exact application conditions must be notified before a guarantee can be given.

For a liquid-barrier dual cartridge seal see the EagleBurgmann Cartex-DN in the pumps category, or the Flowserve ISC2 API 682 cartridge seal.

How the EagleBurgmann HRGS-D works

Two seal pairs run with a barrier gas between them instead of a liquid film. Grooves in the seal faces pump the gas in and lift the faces slightly apart. The faces then run without contact, so there is no friction and no heat at the seal.

Where the HRGS-D is used

• Chemical industry pumps
• Refining technology pumps
• Pumps handling gases
• High-purity media
• Environmentally harmful media

Selection checklist for the HRGS-D

• Shaft diameter
• Version
• Process pressure
• Buffer gas pressure
• Elastomer type
• Sliding velocity
• Face materials
• Medium

Installation, commissioning and maintenance notes for the HRGS-D

Fit the cartridge on the shaft and tighten it to the seal chamber. Connect the buffer gas supply and set the gas pressure above the process pressure. Check the gas supply and the seal at regular intervals.

Requesting a quotation for the EagleBurgmann HRGS-D

Please send the shaft diameter, the process pressure and the medium. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

HRGS-D seal type

It is a double, balanced, gas-lubricated cartridge seal.

HRGS-D maker

It is made by EagleBurgmann.

HRGS-D media

It suits gases and liquids, including media with solids.

HRGS-D contact-free running

The faces run without contact on a gas barrier.

HRGS-D heat generation

No heat is generated at the seal or in the medium.

HRGS-D face grooves

Standard faces have U-grooves that work in both directions of rotation.

HRGS-D rotating seat

The seat rotates in the HR design.

HRGS-D pressure reversal

The principle is self-closing at pressure reversal.

HRGS-D gas failure

The seal does not open if the buffer gas pressure fails.

HRGS-D DC version

The HRGS-DC is the version for standard seal chambers.

HRGS-D DD version

The HRGS-DD is for larger shafts or higher pressure.

HRGS-D shaft diameter

Shaft diameters run from 20 to 200 mm.

HRGS-D DC pressure

The HRGS-DC takes process pressure up to 22 bar.

HRGS-D DD pressure

The HRGS-DD takes process pressure up to 40 bar.

HRGS-D EPDM limit

EPDM runs from minus 20 to plus 140 degrees C.

HRGS-D FKM limit

FKM runs from minus 20 to plus 170 degrees C.

HRGS-D FFKM limit

FFKM runs from minus 20 to plus 120 degrees C.

HRGS-D sliding velocity

Sliding velocity runs from 4 to 25 m/s.

HRGS-D differential pressure

Differential pressure runs from 3 to 16 bar for internal pressure.

HRGS-D seal faces

Product-side faces and seats are silicon carbide.

HRGS-D atmosphere side

The HRGS-DC atmosphere side can use carbon graphite faces.

HRGS-D springs

Springs are CrNiMo steel or Hastelloy C-4.

HRGS-D outboard seal

The HRGS-DC uses a CGSH outboard seal and the HRGS-DD uses a DGS outboard seal.

Seal records for the HRGS-D

Record the gas pressure, the process pressure and the date of each check.

Choosing the right HRGS-D version

Choose the version from the shaft size and the process pressure.

Documents and quotation

The EagleBurgmann HRGS-D data sheet (3 pages, EN) lists the operating range, materials, parts list and the DC and DD variants is attached to this page and is the manufacturer’s own document, not a Seven Star summary.

Before ordering confirm the shaft diameter, speed, product and temperature, product and buffer pressure, the gas supply, flange dimensions and elastomer. Seven Star LLC, an independent supplier in Muscat, quotes the EagleBurgmann HRGS-D against your duty point and delivery requirement; send the document tag, flow, head and liquid so the right size can be confirmed before an offer is issued.