Tandem seals

Application 

In pumps and units, sealed with petroleum products, liquefied hydrocarbon gases, fluids containing harmful chemical substances.
Most effective in cases when buffer fluid must not escape into working media. Tandem seals (YTD) are used at working medium temperatures up to 200°C; tandem seals with a cooling unit (YTTX) are used at working medium temperatures up to 400°C.

Modifications

• With springs located inside of pumped product (sealed with medium).
• With springs located outside of pumped product. Used in cases, if there is a risk for the holes and springs to be blocked with abrasive particles and segments.
• With shaft cooling unit and without it. 
  

Features

• Leakage of working medium to the atmosphere is excluded.
• The first (sealed medium side) seal face functions at differential pressure between medium and buffer fluid, and the second (atmosphere side) - at differential pressure between buffer fluid and atmosphere.
• Buffer fluid is chemically non-corrosive, non-toxic liquid compatible with sealed medium.
• Usage of a cooling unit allows creating favourable temperature conditions for sealing.
• Usage of various cooling fluids: industrial water, antifreeze, diesel oil, etc.
• Manifold is done in compliance with API 682 standard: Plan 52.
• There is no need to press buffer fluid with gas.