EagleBurgmann Cartex-DN Dual Cartridge Mechanical Seal

Dual cartridge seals with an integrated pumping device for barrier-fluid sealing

The EagleBurgmann Cartex-DN is a pre-assembled dual (double) cartridge seal with a pressure-balanced, back-to-back arrangement and an integrated pumping device that circulates the barrier fluid. It is designed for centrifugal and eccentric screw pumps, packing conversions, retrofits and original equipment, with no dimensional change to the seal chamber on centrifugal pumps. The datasheet lists TA Luft (German Clean Air Act) compliance. Recommended applications on the datasheet include the petrochemical, chemical, pharmaceutical, power plant, pulp and paper, mining and food and beverage industries.

EagleBurgmann notes that dirt entering during assembly cannot damage the seal because it is delivered pre-assembled, and that the dynamically loaded O-ring does not damage the shaft. A variant for eccentric screw pumps (-Vario) and a gas-lubricated version (-GSDN) are available.

Technical specifications

Barrier system and piping plans

EagleBurgmann lists its QFT1000 and QFT2000 buffer vessels as suitable for the Cartex-DN in a back-to-back arrangement, and its TS1016 and TSA2 thermosiphon systems as supporting double and back-to-back seal configurations. Further product links on the datasheet are the TS1000 thermosiphon, the MultiFlow Unit (MFU) and BestFlow. For the barrier circulation system the datasheet limits p3 to 25 bar and recommends a pressure difference between barrier and product of only 2 to 3 bar in normal operation, rising to 7 bar for barrier fluids with poor lubricating properties.

The table shows sample points from the dimension tables, which are printed for every shaft diameter in both millimetres and inches; the seal cover is available in machined or cast version.

Selection and installation notes

Choose a dual seal when the process liquid must not reach the atmosphere, or when the liquid is toxic, flammable or abrasive and a clean barrier fluid is wanted at the faces. Confirm the barrier fluid viscosity and its compatibility with the elastomers, set the barrier pressure above the product pressure by the recommended margin, and check that the face combination is rated for the product pressure, since silicon carbide against silicon carbide limits product pressure to 20 bar compared with 25 bar for the BQ1 pairing.

For a single-seal alternative on the same pump see the John Crane Type 5610 cartridge seal, or the EagleBurgmann Cartex-SN single cartridge seal in our pumps category.

How the EagleBurgmann Cartex-DN works

Two seals sit back to back with a barrier fluid between them. An integrated pumping device circulates the barrier fluid. The barrier fluid cools and lubricates the seal faces and keeps the process fluid inside the pump.

Where the Cartex-DN is used

• Petrochemical plants
• Chemical plants
• Pharmaceutical plants
• Power plants
• Pulp and paper mills

Selection checklist for the Cartex-DN

• Shaft diameter
• Process pressure
• Barrier pressure
• Fluid temperature
• Face materials
• Elastomer type
• Pump type
• Barrier fluid supply

Installation, commissioning and maintenance notes for the Cartex-DN

Fit the pre-assembled cartridge on the shaft and tighten the gland. Connect the barrier fluid lines and fill the system. Check the barrier level and the seal at regular intervals.

Requesting a quotation for the EagleBurgmann Cartex-DN

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

Cartex-DN seal type

It is a dual cartridge mechanical seal.

Cartex-DN maker

It is made by EagleBurgmann.

Cartex-DN arrangement

The seals are in a back-to-back arrangement.

Cartex-DN pressure balance

The design is pressure balanced.

Cartex-DN pumping device

An integrated pumping device circulates the barrier fluid.

Cartex-DN rotation

It works in either direction of rotation.

Cartex-DN assembly

It is delivered pre-assembled.

Cartex-DN dirt protection

Dirt entering during assembly cannot damage the seal.

Cartex-DN pumps

It serves centrifugal and eccentric screw pumps.

Cartex-DN retrofit

It suits packing conversions, retrofits and original equipment.

Cartex-DN seal chamber

There is no dimensional change to the seal chamber on centrifugal pumps.

Cartex-DN shaft size

Shaft diameters run from 25 to 100 mm.

Cartex-DN other sizes

Other sizes are available on request.

Cartex-DN barrier pressure

Barrier pressure reaches 25 bar.

Cartex-DN temperature

The temperature range is minus 40 to plus 220 degrees C.

Cartex-DN axial movement

Axial movement of 1.0 mm is allowed.

Cartex-DN seal faces

Faces are silicon carbide, carbon graphite or tungsten carbide.

Cartex-DN secondary seals

Secondary seals are FKM, EPDM, FFKM or PTFE.

Cartex-DN springs

The springs are Hastelloy C-4.

Cartex-DN O-ring

The dynamically loaded O-ring does not damage the shaft.

Cartex-DN variants

Variants are Vario for eccentric screw pumps and GSDN for gas lubrication.

Cartex-DN other industries

It also serves mining and food and beverage plants.

Seal records for the Cartex-DN

Record the barrier pressure, the temperature and the date of each check.

Choosing the right Cartex-DN seal

Choose the seal from the shaft size and the process conditions.

Documents and quotation

The EagleBurgmann Cartex dual seals data sheet (5 pages, EN) lists operating range, materials, piping-plan recommendations and dimension tables in mm and inch is attached to this page and is the manufacturer’s own document, not a Seven Star summary.

Before ordering confirm the pump make and model, shaft diameter, product, temperature and pressure, the barrier fluid and its supply system, and the face and elastomer codes. Seven Star LLC, an independent supplier in Muscat, quotes the EagleBurgmann Cartex-DN 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.