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S d-blending in large hydrocarbon storage tanks
 

S d-blending in large hydrocarbon storage tanks

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  • Who’s Who / Whats What Company founded 1981 Formerly John Black Ltd. We are an engineered products sales agency Process and Control Equipment for Industrial and Municipal applications Located in North Vancouver
  • Questions? Thank you for your kind attention .

S d-blending in large hydrocarbon storage tanks S d-blending in large hydrocarbon storage tanks Presentation Transcript

  • Company ConfidentialCompany Confidential Building On Success
  • Company ConfidentialCompany Confidential Who’s Who / What’s What > Company founded 1981 •Formerly John Black Ltd. > We are an engineered products sales agency > Process and Control Equipment for Industrial and Municipal applications > Located in North Vancouver
  • Company ConfidentialCompany Confidential PAGE 3 B&B’s Process Equipment experience includes lines from companies such as • LIGHTNIN/ SPX / Plenty • SWECO •SMITH & LOVELESS •SPIROFLOW • SIHI PUMPS •SIOUX •JESCO LUTZ •TITAN MBR
  • Company ConfidentialCompany Confidential >INTRODUCING DENNIS KERFELD, REG MGR SPX LIGHTNIN >Thank you
  • MIXING IN LARGE HYDROCARBON STORAGE TANKS Sacre Davey Lunch & Learn Sept. 5, 2013 Dennis Kerfeld Regional Sales Manager – West Side Entry Mixers
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Mixing,Blending or Homogeneity ? > Mixing covers all process applications, liquid/liquid + gas/liquids + liquid/solids and solids/solids > Blending assumes two or more liquids to achieve a final state or third product within a given time. This can include solid suspension > (Maintenance of) Homogeneity assumes one product only > BS&W – maintaining water and solids in suspension within crude oil All blending applications in large tanks are flow related and so selection is made by calculating the required flow and selecting the mixer(s) to achieve that flow
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Sizing -methodology and limitations All manufacturers should use some form of selection procedure and it would involve the physical parameters of the tank. Some mixer companies have more experience than others, both in numbers in service and process knowledge. Our system has been in constant use successfully for over 50 years. It was developed with Shell Oil in The Hague Note: If insufficient power is supplied or some of the mixers are out of action, almost no mixing will take place.
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS REQUIRED INFORMATION > Tank Diameter and maximum liquid height (the tank height is not relevant to the calculations) > Properties of the product(s) – s.g.; viscosity (at operating conditions); % of each product and volumes > Process expectations. Blending using pump up or stratified conditions; heat transfer (bitumen, palm oil) or BS&W (maintaining the solids and water in suspension as found in Crude Hydrocarbon or bio-diesel oils) > The allowable time or limitations to available power
  • Company ConfidentialCompany Confidential PAGE 9 BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Recommended mixer positions on the tank – incorrect positioning can lead to poor mixing and wasted power
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Limitations and obstructions Tank size & height is not an obstruction – largest tanks we have mixed are in excess of 120metres in diameter & 25metres height
  • Company ConfidentialCompany Confidential PAGE 11 BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Limitations and obstructions Floating roof supports do not create difficulties as by the time the supports reach the floor the mixers have been stopped. (The lowest mixable depth used in most tanks is about 2½ metres)
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Obstructions such as rigid roof supports can hinder flow and reduce the effectiveness of the mixers, requiring more power and time to do the same mixing job
  • Company ConfidentialCompany Confidential PAGE 13 BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Flow dispersion pipes which intrude into the tank and have large diameters will significantly affect the flow leading to product slowdown and solid deposition. Horizontal heating coils in general do not have a significant effect, although vertical heating blocks will. Roof drains are not a serious obstruction as the diameter is small compared with the mixer flow.
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS PROPELLERS OR JET NOZZLES Both systems work! Both work by creating a jet flow in the tank, The propeller develops a circulatory motion leading to better entrainment and the flow reaches across the diameter of the tank. Jet mixers normally reach a maximum of 13 metres. To do the same job as propeller mixers jet mixers require a pump to develop 8 bar pressure at the nozzle and create large flows. Tanker unloading pumps cannot supply this pressure and volume and cannot be used. The costs for delaying a tankers departure for this application would be extremely expensive even if it would be allowed. It is not unusual to hear of pumps needing twice the motor power to generate the pressure and flow as the total calculated for the propeller mixers.
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Flow patterns – propeller v. jet nozzles
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS PROPELLER MIXERS v JET MIXERS Compare propeller mixer with ALL maintainable parts outside the tank with jet mixer with ALL maintainable parts inside the tank Compare the jet flow generated by impellers 14-33” diameter with jet created by pressure from pump through 4” diameter nozzle. Compare power required for mixers and jets –jets can require pump motors with 2 x total power of mixers
  • Company ConfidentialCompany Confidential PAGE 18 BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Latest developments Pointing mixers upward – can reduce blend times by as much as 50% Fuel oil Blending in The Netherlands
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS Upward Pointing Mixers Switchoff is liquid level at which upward pointing mixer(s) should be turned off to protect floating roof. This is normally at half the HLL. The horizontal mixer(s) continue to operate until minimum operating level at 2.5d above h2
  • Company ConfidentialCompany Confidential PAGE 20 BLENDING HYDROCARBONS IN LARGE STORAGE TANKS CFD – Computational Fluid Dynamics A useful tool for ‘seeing’ the flow at a moment in time and potential deposition points Showing flow at 10 degrees left Horizontal – no pipes Showing flow at 10 degrees left Horizontal - distributor pipes
  • Company ConfidentialCompany Confidential BLENDING HYDROCARBONS IN LARGE STORAGE TANKS THE END Thank you Ladies & Gentlemen – I/we will be happy to take questions now.