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  1. JohnWeal

    Generator day tank elevation

    Good morning, What is the recommendation for the elevation of a day tank? We have a 3500 litre tank for each 2MW generator (5 in total) and feed is from 2 x 60,000 litre bulk diesel oil storage tanks. The bulk storage tanks are 80 metres away and approx 5m in elevation below the generator...
  2. JohnWeal

    100% RH through fans

    We have 4 fans vertically mounted pulling air from a plenum and delivering into a plant room throu louvres. Flow rate is 60,000m3/h per fan with only 3 fans running at any one time. Each the fans are long cased axial type with internal motor. The manufacturer states that the maximum RH for the...
  3. JohnWeal

    Exhaust Gas Heat Exchanger installation

    Hello MintJulep, Sorry, should the heat exchanger be mounted on a plinth or does it not really matter? Regards J
  4. JohnWeal

    Exhaust Gas Heat Exchanger installation

    Good evening, An EGHEis to be installed in a power plant The total mass is 2000 kg. It is currently shown installed on directly into the building slab base floor. I stated that it should be installed on a plinth. (Or two plinths to be more precise - one under each of the two flat bottomed...
  5. JohnWeal

    Heating Sludge hot water circuits

    We have 2 sludge digesters on a Wastewater Treatment Plant each requiring 250kW in summer and 1050kW in winter to keep the sludge at 38 deg C. Heat energy is provided by 3 x CHP engines which have individual Pumps that take hot water from the main circuit. However, when a CHP out for...
  6. JohnWeal

    Screened sewage rising main

    Yes, definitely pumped!! Georgeverghese, RTP maybe ok as the pups are pumping 6mm screened sewage which will have grit too but at least bo impact from large debris. Atvthe moment what seems favourable hydraulically is two DN1400 pipelines rather than a single DN2000.
  7. JohnWeal

    Screened sewage rising main

    Many thanks Littleinch. Was thinking exactly the same an hour ago. Going to 3 rather than two. Balancing flows and introducing control valves is expensive I think unnecessary. Especially on sewage. What might be ideal for flow may not be easy for installation. One advantage definitely for a...
  8. JohnWeal

    Screened sewage rising main

    Thanks Bimr. I guess the trench is much wider too!! What is the minimum dimension between the pipelines? I guess enough to join by push-fit (ductile iron) lowering in a welded 1500mm pipeline is no easy task!!
  9. JohnWeal

    Screened sewage rising main

    Hello all, We have the following defined flows for sewage screened to 6mm (perforated plate) Daily average flows: 7000 m3/h Peak hourly to full treatment: 19,000 m3/h Minimum: 2100 m3/h The min / max velocities allowable by the client are 0.75 and 1.8 m/s respectively. Based on the max flow...
  10. JohnWeal

    overall heat transfer coefficient

    Hello For a stainless steel tube, 168mm OD and 2mm wall, carrying digested sludge at 36 deg C and the outer annulus carrying teated water at 70 deg C Counter-current flow and both flows are turbulant, is there a 'rule of thumb' practical overall heat transfer 'U' value used in calculations? I...
  11. JohnWeal

    Diverter or mixing valve

    Good evening We have a requirement to put water at 70 deg C into the annulus of a concentric tube in tube heat exchanger (construction is 2 streams of 7 tubes which are each 6m long) This is to heat digester sludge from 36 to 39 deg C. The calculated mass flow rate is 24 kg/s for the maximum...
  12. JohnWeal

    Standby boilers

    Hello All, We have 3 CHP engines that will provide heat energy to the hot water distribution circuit. As a backup energy input, we have to install 2 hot water Boilers (duty / standby operation when called to run) The boilers are each 2300 kW with burners that run on biogas and light fuel oil...
  13. JohnWeal

    100% saturated biogas pipeline velocity

    Hello, We have a centrifugal blower which is to raise the incline gas pressure from 17 mbar to 120 mbar for putting into a boiler. There is no process unit for removing moisture. (The client is taking all risks should this affect the burner/boiler or any other components) We do have condensate...
  14. JohnWeal

    Digester foaming

    Good Afternoon, The client specifications require the biogas offtake to be a minimum of 1.5m above the sludge liquor level. Has anyone on this forum experienced foam entering the offtake pipeline and if so, what are the consequences and remedial actions required? The offtake pipework is DN200...
  15. JohnWeal

    Biogas SIL rated Valve

    Good Afternoon, On a biogas pipeline where the biogas is saturated, is it acceptable to place the SIL rated slam shut valve before a condensate knock-out pot? Can the corrosive nature of the condensate cause the valve to malfunction? CH4 = 60%, CO2 = 37%, H2S = 400 ppm Pressure in pipeline is...
  16. JohnWeal

    Biogas velocity

    Many thanks for your replies. The longest length we have is 70m and this is on a steady fall of 1 degree. Yes bimr, it is a for a wastewater treatment works two AD's. LittleInch, A large proportion of the 70m is indeed PE yellow gas pipe buried and rated at 2 bar. (we are well under that!!)...
  17. JohnWeal

    Biogas velocity

    Many thanks for your reply George... I did spot a mistake. Should have read CH4 as 60% not 69%. I should also have mentioned that we only have an operating pressure between 20 and 26 mbar. Regards John
  18. JohnWeal

    Biogas velocity

    Good Evening All, Is there a recommendation in any standards for the velocity range for biogas in stainless Steel pipelines? If the moisture created during cooling is flowing in the same direction as the gas, the pipeline is laid with a 1 degree fall. If the condensate is draining back against...
  19. JohnWeal

    Anaerobic Digester Stainless Steel roof access

    Hello bimr, Yes we have and I think that is what we are going to have to do. The nozzles are inspected on a 6 month basis. Thank you for your reply. Regards John
  20. JohnWeal

    Anaerobic Digester Stainless Steel roof access

    Good afternoon We are having many questions asked by the client regarding digester roof access. The roof is stainless steel 316L and has 4mm sheets bolted from the underside of the radial roof beams. Therefore any components exposed to the gas are SS 316L. As the roof beams are not in contact...

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