Apilite-RDT Mechanical Seal

Apilite RDT - Tandem pusher seal (API 682, Type A)


 The APILITE (R) mechanical seal is a new addition to the API 682 RDT cartridge seal family. It is designed for sealing heavy and light hydrocarbons, including VOCs, and other hazardous fluids at oil refineries and petrochemical plants, gas plants, and chemical plants. APILITE RDT seal is an o-ring dual seal to be used with API Plan 52, 53, or 54.

RDT family seals are used for the same applications as the followings seals:
H7/H75 by Burgmann Germany;
QBQ by Flowserve, USA;
8B/59/58 by John Crane, USA;
MS spring family by EKK Eagle, Japan.


  • Minimized bending of seal rings allows for stable operation under higher pressures and for longer MTBR (mean time between repair) because of less wear;
  • Same seal can be used in tandem and double applications;
  • Interchangeability of many parts and design solutions with the SD APITERM seal reduces inventory of spare parts, lets the seal survive under pump dry-running, and decreases prices by encreasing parts production volume;
  • Containment outboard seal version available for API 682 flush plans 71 and 72;
  • Connections for API 682 flush plans 11/13, 21, 22, 31, 32, and 52/53/54 are provided as standard.
Technical Data
Temperature From -50 up to +260°C
Dynamic Pressure Up to 50 bar
Static Pressure Up to 90 bar
Linear Speed Up to 50 m/sec

See also: 

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