Robust and economical: Sealing concepts for chemical pulp production

For the reliable sealing of black liquor, L9UC type mechanical seals are used at Nagayo Paper in Japan.

Operating conditions: p = 3 bar (44 PSI), t = 85 °C (185 °F), n = 1,750 min⁻¹.

A Pulpex-S/135-00 is installed in a sorter at the Sappi paper mill in Lanaken/Belgium. The mechanical seal runs in a continuous process in pulp preparation.

Operating conditions: p = 3.5 bar (51 PSI), t = 80 °C (176 °F), n = 800 min⁻¹. Medium: pulp.

A successful seal type for the entire plant: Over 250 standardized EagleBurgmann Cartex cartridge seals are installed in pulp pumps and in the pumps of the chemical sector at the Swedish Iggesund Holmen paper and pulp mill.

Operating conditions: p = 12 ... 25 bar (174 ... 363 PSI), t = -40 °C ... +220 °C (-40 °F ... +428 °F), n = 1,660 min⁻¹.

At the UPM Pietarsaari pulp mill in Finland, a Sulzer APP 23 pump is sealed with an EagleBurgmann Mtex-TN. This cartridge version of the metal bellows seal is particularly suitable for highly viscous media at low temperatures.

Operating conditions: p = 1 bar (15 PSI), t = 120 °C (248 °F), n = 1,500 min⁻¹. Medium: Tall oil.

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Chest agitators at Sappi in Lanaken/Belgium were retrofitted to EagleBurgmann HGH type semi-split mechanical seals. Since then, product leakage has been drastically reduced and plant availability has noticeably increased.

perating conditions: p = 0.5 bar (7.25 PSI), t = 20 °C – 40 °C (68 °F – 104 °F), n = 300 min⁻¹.

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