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Oil-settling tanks ON



Oil-settling tanks ON serve to oil dehydration and gas emission at the oil desalting and dehydration plant.

The Saratov Reservoir Plant produces settling tanks ON with a volume of up to 200 m3 in horizontal design. Upon special request it is also possible to supply vertical tanks.

Settling tanks ON design

Settling tanks are manufactured in a horizontal design with a vertical feed of oil emulsion.

The tank is delivered to the facility in full factory readiness, which allows to immediately install it on a reinforced concrete foundation and put it into operation.

The settling tanks are operated with highly corrosive liquids. To protect the inner surface of the shell, it is covered with anti-corrosion compounds. At the customer's request, heat treatment of the housing is possible. Also the internal devices are made of stainless steel for long life of the oil settling tanks.

If the settling tanks are planned to be operated in a cold climate, the housing may be heat-insulated.

Operating peculiarities

To function there are manholes, fittings and pipes all around the tank. They serve to oil emulsion inlet, dehydrated oil outlet, gas disposal, drainage and steaming, sludge removal, and processing equipment installation, i.e. pressure relief valve, gauge, interfacial level gauge, level control, pressure gauge.

The watered oil is fed to the tank through the inlet connection and distribution device. Inside there are metal baffle plates made of grating. Due to the settling and mixing processes, water and gas are separated. The separated water discharge is performed automatically after having got interfacial level gauge signal.

Settling tank ON 100 m3 drawing

Settling tank OG-100 produced by SARRZ

Settling tank OG-100 drawing

Nozzle schedule

Designation Application Designation Application
А crude-oil emulsion inlet М2 pressure sensor
Б gas outlet Н1...Н4 visual level gauge
В oil outlet П steaming
Г water outlet Р1, Р2 level transmitter
Д drainage С1...С5 level alarm
Е1, Е2 sludge removal Т1 temperature probe
Ж1, Ж2 water inlet for sludge washout Т2 temperature sensor
И water inlet into the collector for sludge washout У safety valve
К intermediate phase sampling Ф1 sampler opener
Л1, Л2 manhole Ф2 sampler opener
М1 pressure gauge Ц gas inlet


Criteria Value
Operating madium crude-oil emulsion
Volume, m3 12.5-200
Capacity, m3/day up to 14000
Operating pressure, MPa 1.0; 1.6; 2.5
Medium temperature, ºС +30...+90
Residual water content in oil, % mass. 0.5...2.0
Oil and mechanical impurities content in formed water in output, mg/l up to 40
Operating temperature, ºС -60...+50
Climatic category NF
Seismicity, points, max 8 (more than 8 at special order)
Material 09G2S, 12Х18Н10Т, St3
Service life, years 20

How to buy settling tank ON?

In order to get the price quotation you may:

  • call at +7(8452)250-288
  • email at

The advantages of cooperation with our Plant are:

  • high quality of the supplied equipment, which guarantees reliable and safe operation
  • individual approach when equipment design
  • favorable terms of cooperation
  • individual delivery conditions when applying for a set of separation and storage equipment


See also:

Oil gas separatorsCentrifugal separatorsThree-phase separators TFS-L
Three-phase separators TFS-GOil dehydration vessels BONOil degassing buffer BDN
Water treating vessels OVNAdvanced water filtration vessels UOVWater degassing buffer BDV
Flotators-degasifiers FDMeshed gas separators GSGas separators
Flare knockout drumsFlare unitsSettling tanks OG
Oil-settling tanks ONSettling tanks with baffle plate OGN PWater settling tanks OW
Water settling tanks with liquid filterHydrophobic water settling tanks