2TMT series tandem mechanical seals

SPECS ТУ У 29.1-30991863-001.2009

Application of the tandem mechanical seals

2TMT series tandem mechanical seals are designed for sealing the shafts of the centrifugal pumps, handling toxic flammable liquids, crude oil, as well as liquids (product), the leakages of which are not acceptable into the atmosphere in the pure form according to the regulatory documents and which do not have a corrosive effect on the seal parts, contacting with them.

2TMTH series seals, which are characterized by a thermal barrier (cooler) on the shaft, are designed for the pumps, handling liquids with a temperature over 200°C. The temperature of the working liquid may reach 400 °С.

Tandem mechanical seals are used with serviceability support system BT-12T-15K.

Tandem mechanical seals may be applied instead of the following seal makes: УСГ, УТТХ, ДН…М, УТТ, etc.

Specific design features of the seals:

  • construction simplicity and reliability;
  • long service life in comparison with the similar ones;
  • the most parts of single, dual and tandem seals are interchangeable with each other;
  • cartridge type seals are easy in installation and dismantling;
  • the springs are removed from the sealed product;
  • seal parts are resistant to load and heat deformations;
  • the auxiliary seal is a self-adjusting non-metallic throttle ring;
  • prior to shipment all mechanical seals are subjected to bed tests;
  • the seals are applied together with a tank heat exchanger in the piping plan 52 according to API 682.

Mechanical seals for the pump shafts

Tandem mechanical seals may be applied in the following pumps:

  • НВ 50/50 series semi-submersible vertical pumps;
  • Кс and КсВ series condensate extraction pumps;
  • НК, НПС and НКВ series centrifugal pumps with overhung impeller;
  • НМ series main pipeline pumps;
  • НГПН series booster pumps;
  • НОУ series semi-submersible vertical pumps, designed for pumping out the leakages;
  • ПЭ, ПТ and ПД series feed water pumps;
  • СЭ series district heating pumps;
  • ЦН series circulating pumps;
  • НКУ series pumps for waste-heat boilers;
  • pumps, made by foreign manufacturers Grundfos, KSB, Higle, AlfaLaval, APV, Wilo, Fristam, Ebara and so on.

Overall and mounting dimensions of tandem mechanical seals

тандемные торцевые уплотнения 2TMТ размеры
Марка D1, мм D2, мм D3, мм D4, мм d, мм Масса, кг
2ТМТ 60-110 60 110 165 190 18 12,5
2ТМТ 70-120 70 120 170 200 18 14
2ТМТ 80-130 80 130 180 210 22 15,5
2ТМТ 90-140 90 140 190 220 22 17
Note

OVERALL AND MOUNTING DIMENSIONS ARE SPECIFIED FOR THE TANDEM MECHANICAL SEALS, USED IN НК, НКВ, НПС AND OTHER CRUDE-OIL PUMPS.

THE SEALS FOR OTHER TYPES OF THE PUMPS MAY HAVE OTHER MOUNTING DIMENSIONS.

Parameters in the seal working area

Наименование Значение
Температура перекачиваемого продукта, оС от -30 до 200
Давление продукта в камере уплотнения, МПа до 3,5
Частота вращения вала насоса, об/мин до 3600

Applicable materials:

  • silicium carbide, tungsten carbide, silicified graphite and antifriction carbon graphite;
  • rubber compounds based on fluorine rubber, perfluoro elastomer and ethylene propylene;
  • stainless steel of grades 20X13, 08Х18Н10Т, 10Х17Н13М2Т and 06ХН28МДТ.

If you have any questions on the selection of the necessary equipment or if you would like to buy a tandem mechanical seal, please, contact us via a contact form.

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