EagleBurgmann Cartex-SN Single Cartridge Mechanical Seal

Pre-assembled single cartridge seals for standard centrifugal and eccentric screw pumps

The EagleBurgmann Cartex-SN single cartridge seal is a pre-assembled, balanced single seal for centrifugal pumps, packing conversions, retrofits and original equipment. EagleBurgmann describes it as an ideal seal for standardisation: no dimensional modification of the seal chamber is needed on centrifugal pumps, the radial installation height is small, and the dynamically loaded O-ring does not damage the shaft because a shaft sleeve is included. Installation is straightforward because the seal arrives as a unit with an assembly fixture.

The Cartex single family comprises the -SN with flush connection, the -SNO without connections for dead-end operation, the -QN for unpressurised quench with a lip seal, the -TN with a throttle ring, and the -Vario with a modified cover for eccentric screw pumps. ANSI-pump variants such as the -ABPN are also listed. Standards and approvals shown on the datasheet are WRAS and UBA (KTW).

Technical specifications

Variants for flush, quench and eccentric screw pumps

Dimensions are published in both millimetres and inches for each shaft diameter from 25 mm (1.000 in) to 100 mm (4.000 in): for example the 25 mm seal has d2 of 43.0 mm, installed length l1 of 67 mm and a cover outside diameter da of 105 mm, while the 100 mm seal has a1 of 6.063 in and da of 8.583 in.

Selection and installation notes

A cartridge seal removes most of the fitting errors of component seals because face compression and setting are fixed at the factory; the assembly fixture holds the seal until it is bolted to the pump and the set screws are tightened. Verify that the stuffing box or seal chamber has enough radial space for the cover, and use the flush or quench connection that matches the liquid: self-flushing for clean liquids, and the -QN or -TN version where a quench is needed to keep the atmosphere side clean or to contain leakage. The face combination sets the limits, so confirm whether the faces are BQ1 or silicon carbide against silicon carbide, because the second pairing is rated for 12 bar and 10 m/s.

For a cartridge seal from another manufacturer see the John Crane Type 5610 cartridge seal.

How the EagleBurgmann Cartex-SN works

A rotating seal face is pressed against a stationary seat by springs. A thin liquid film between the faces keeps leakage low. The whole seal arrives as one cartridge unit with a sleeve, so it slides onto the pump shaft ready to fit.

Where the Cartex-SN is used

• Standard centrifugal pumps
• Eccentric screw pumps
• Packing conversions
• Pump retrofits
• Original equipment pumps

Selection checklist for the Cartex-SN

• Shaft diameter
• Variant
• Seal face materials
• Secondary seal material
• Pressure
• Sliding speed
• Temperature
• Flush connection

Installation, commissioning and maintenance notes for the Cartex-SN

Slide the cartridge onto the shaft with the assembly fixture in place. Tighten the cover to the seal chamber and then remove the fixture. Check the seal for leakage at regular intervals.

Requesting a quotation for the EagleBurgmann Cartex-SN

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

Cartex-SN seal type

It is a single cartridge mechanical seal.

Cartex-SN maker

It is made by EagleBurgmann.

Cartex-SN balanced design

It is a balanced seal.

Cartex-SN direction of rotation

It works in either direction of rotation.

Cartex-SN pre-assembly

The seal comes pre-assembled as a unit.

Cartex-SN assembly fixture

An assembly fixture makes installation straightforward.

Cartex-SN shaft sleeve

A shaft sleeve protects the shaft from the O-ring.

Cartex-SN seal chamber

No dimensional change of the seal chamber is needed on centrifugal pumps.

Cartex-SN installation height

The radial installation height is small.

Cartex-SN flush connection

The SN variant has a flush connection.

Cartex-SN SNO variant

The SNO variant has no connections for dead-end operation.

Cartex-SN QN variant

The QN variant has an unpressurised quench with a lip seal.

Cartex-SN TN variant

The TN variant has a throttle ring.

Cartex-SN Vario variant

The Vario variant has a modified cover for eccentric screw pumps.

Cartex-SN shaft diameter

Shaft diameters run from 25 to 100 mm.

Cartex-SN pressure

Pressure is up to 25 bar with the BQ1 face pair.

Cartex-SN sliding velocity

Sliding velocity is up to 16 m/s with the BQ1 face pair.

Cartex-SN temperature

Temperature runs from minus 40 to plus 220 degrees C.

Cartex-SN axial movement

Axial movement is plus or minus 1.0 mm.

Cartex-SN seal face

Seal faces are silicon carbide, carbon graphite or tungsten carbide.

Cartex-SN seat

The seat is silicon carbide.

Cartex-SN secondary seals

Secondary seals are FKM, EPDM, FFKM or PTFE.

Cartex-SN springs

The springs are Hastelloy C-4.

Cartex-SN seal cover

The seal cover is cast or machined.

Seal records for the Cartex-SN

Record the shaft size, the face materials and the date of each fitting.

Choosing the right Cartex-SN variant

Choose the variant from the pump type and the flush need.

Documents and quotation

The EagleBurgmann Cartex single seals data sheet (7 pages, EN) lists the operating range, materials, variants 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 variant, shaft diameter, pump make and model, liquid, temperature, pressure, speed and the required face and elastomer codes. Seven Star LLC, an independent supplier in Muscat, quotes the EagleBurgmann Cartex single seal 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.