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  • Users: Techcitizen
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  1. Techcitizen

    Cooling Tower operation at a lower load?

    Thanks friends for your thoughts, let me expand/explain the matter a little more in detail. Let us assume that the ambient conditions remain constant and freezing is not an issue. The NDCT (hyperbolic) is running with a certain fix ciculation flow rate which is basically governed by the pumps...
  2. Techcitizen

    Cooling Tower operation at a lower load?

    If I run a Natural Draft Cooling Tower at a heat load lower than its capability, keeping the hot water inlet temperature same for given ambient conditions, what will be the effect on the water outlet temperature?
  3. Techcitizen

    Raw water TOC removal

    Joemike, I have come across the problem of high TOC and it was solved by installing a RO downstream of DM plant to further polish part of the Demin water. This RO polished water is used only for boiler make-up which is relatively a small quantity (approx. 7 to 10 m3/hr). If you are interested...
  4. Techcitizen

    VFD and Minimum Flow Valve

    Thanks for the replies. To take the discussion further I give some relevant details. we have 3 x 50% (2 running & 1 standby) centrifugal pumps feeding a common header and then individual lines feed the Boilers thru control valve (CV). With the existing set-up, we can not directly transfer the CV...
  5. Techcitizen

    VFD and Minimum Flow Valve

    We are looking into installing a Variable Frequency Drive for a Boiler Feed Pump. One of the issue is what to do with the minimum flow valve at the pump discharge. With VFD the pump may run at less than the discharge pr setting of the minimum flow valve in case of very low flow requirement, and...
  6. Techcitizen

    Centrifugal Pump and Gear Pump in Series

    JamesDUK, If not already done, would suggest you to ensure that the setting of the pr control in the spill back line (connected to the suction line of the GP) is such that it corresponds with the CP characteristic curve for a flow of 9 m3/hr ! If the pr setting is high, the pusations can still...
  7. Techcitizen

    Centrifugal Pump and Gear Pump in Series

    Gear Pp (GP) is a constant flow device whereas Centri Pp (CP) is a variable flow. During start-up, GP is not running and the flow requirement is less, so the CP runs at low flow high discharge pr. The fluctuation in suc pr shows that as soon as you start the GP it tries to draw its required...
  8. Techcitizen

    propeller leading edge coating

    one company which might be of help to you is ; Analytical Services & Materials, Inc. 107 Research Drive, Hampton, VA 23666 U.S.A. Tel. 757 865-7283 Fax 757 865-7309.
  9. Techcitizen

    Alternative to direct Chlorination in a Cooling Water System ?

    jherbert, Can you pl reply at hemgaj@indiatimes.com !
  10. Techcitizen

    Alternative to direct Chlorination in a Cooling Water System ?

    jherbert, Any idea about feasibility of Ozone for large circulating flows (say 36000 cu.m/hr) ? What kind of technology you have adopted, who has supplied it, what is the circulating flow in your case and what is the approx cost ? Thanks in advance for the replies !
  11. Techcitizen

    Alternative to direct Chlorination in a Cooling Water System ?

    Can somebody suggest an alternative (other than NaOCl) to direct Chlorination (which is done by mixing gaseous chlorine in water thru a ejector) for a large Cooling Water System (circulating flow of approx. 36000 cu.m/hr) ? What is your experience with such a system ?
  12. Techcitizen

    BS970/72 - 015A03 equivalent ?

    Thanks atad and Andy. Any DIN matches on this ?
  13. Techcitizen

    BS970/72 - 015A03 equivalent ?

    Can anybody suggest the latest equivalent in BS or ASTM for the old BS970/72 - 015A03 low carbon steel ? Will any of the EN grades match this ?
  14. Techcitizen

    CORRECTED TURBINE GAS HEAT RATE

    Please correct 860000 to 86000 in my previous mail, i.e. 86000 divided by the %efficiency will give you the heat rate.
  15. Techcitizen

    CORRECTED TURBINE GAS HEAT RATE

    You need the correction curves (Efficiency Vs. Humidity & Efficiency Vs Ambient Temperature) for the engine. These are standard curves and given by the GT Supplier. As might be already known to you, 860000 divided by the %efficiency will give the Heat Rate in KCal/KWhr. Also standard curves are...
  16. Techcitizen

    demin tank vent filter- scrub CO2 ?

    davefitz, I am unable to send message on your e-mail address. You may give an alternate address or write your fax no.
  17. Techcitizen

    demin tank vent filter- scrub CO2 ?

    We have what is called a CO2 absorber connected to the DM tank vent. It is a pot filled with KCL solution located on the ground. Pipe from the vent is immersed into this solution. The immersed portion of the pipe has small holes through which the air gets sucked in, passes through the KCL...
  18. Techcitizen

    Cross refernce for materials

    Please have a look at the FAQ titled "Material Search".
  19. Techcitizen

    Looking for material identifications, specs and equivalents on the net?

    Here are some websites which are of help ; http://www.matweb.com http://www.azom.com http://www.metals.about.com http://metalinfo.com http://key-to-steel.com http://asm-intl.org (or http://asminternational.org) http://stahlschlussel.de
  20. Techcitizen

    DI Water and Stainless Steel

    We have SS 304L Or MSRL (MS rubber lined) for most of DI water (resistivity > 10 mohm) piping in our plant. Have also used SS304 or HDPE piping at few places. Hope this helps !

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