2TM series dual mechanical seals are designed for sealing the shafts of the centrifugal pumps, handling liquefied gases, toxic explosive liquids, which are prone to coking, crystallization and polymerization, as well as gases and liquids (product), the leakages of which are not acceptable into the atmosphere according to the regulatory documents and which do not have a corrosive effect on the seal parts.
2TMH 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.
Mechanical seals are used with serviceability support systems BTN-12D-35K and SAPPD 1.1-7.5/2-35K.
Dual mechanical seals may be applied instead of the following seal makes: УТД, УТДХ, ДНТ, ДНК, БД, ДК, etc.
Specific design features of the seals:
construction simplicity and reliability;
long service life in comparison with the similar ones;
cartridge type seals are easy in installation and dismantling;
the rings in the friction pair are hydraulically unloaded;
seal parts are resistant to load and heat deformations;
the auxiliary seal is a self-adjusting non-metallic throttle ring;
the most parts of single, dual and tandem seals are interchangeable with each other;
prior to shipment all mechanical seals are subjected to bed tests;
the seals are applied in the piping plans 53А, 53В, 53С и 54 according to API 682.
Mechanical seals for the pump shafts
Dual 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 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, etc.
Overall and mounting dimensions of the dual mechanical seals
OVERALL AND MOUNTING DIMENSIONS ARE SPECIFIED FOR THE 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
Температура перекачиваемого продукта, оС
от -30 до 200
Давление продукта в камере уплотнения, МПа
Частота вращения вала насоса, об/мин
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 dual mechanical seal, please, contact us via a contact form.
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