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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...

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?

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...

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...

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...

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...

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...

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.

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

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 !

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 ?

Thanks atad and Andy. Any DIN matches on this ?

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 ?

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

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

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...

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

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 !