Mechanical Seals with DiamondFace in an oil pump station
Problem and challenge
The pipeline “Poliducto de Oriente” comprises of two terminals and three pumping stations to transport refined products like LPG, Jet Fuel, Gasoline & Diesel from Barranca Refinery to Santiago de Cali (the capital of Valle del Cauca State) and the South West States of Colombia. One of these stations is Herveo Pump Station. Located at 2,680 meters above sea level it is one of the highest-located in the country. The Pump Station is equipped with two main pumps, one with an electric motor and one with a diesel engine. It receives in the suction an average pressure of 14 bar (200 PSI) from Fresno Pump Station and delivers on the discharge an average pressure of 83 bar (1,200 PSI) to Manizales Plant, with a sealing chamber pressure of approximately 28 bar (400 PSI). The Byron Jackson 11-stage DVMX pumps are directly connected to the engine and valves for flow control.
Dual pressurized SHF-D1/72-E2 & E3 seals have been selected for this very demanding application, connected according to API Plan 53B and equipped with an EagleBurgmann heat exchanger WED 2130/A 100-00 on each circuit (each of the two bearing pumps are fitted with two dual seals). Because of supply conditions at the pump station, it was decided to use Diesel as barrier fluid. The SHF-D seal has a common rotating face for two face-to-face stationary face arrangements, which leaded to a reduction of stock spare parts. The stationary faces are reinforced on their inside and outside diameter (EagleBurgmann sandwich seal face technology) to be able to withstand high pressures up to 150 bars. The stationary springs provide consistant closing force on the seal faces and are damping vibrations at the same time.
An internal pumping screw assures optimum heat dissipation throughout the seal while a special multipoint injection ring ensures the homogeneous distribution of barrier fluid to the seal. It has to be emphasized that the described dual pressurized arrangement has zero leakage of product to the atmosphere. All in all, the mentioned features contribute to prevent dry running of the seal and flashing of LPG, extend the lifetime of the seal and provide a remarkable MTBF of 10 years.
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