Reminder – ITT can provide accessory items with our GPHE heat exchangers. These include Port Strainers, Insulation Kits, Automatic Back-Flush Systems and Drip Pans. Any of these can add value to our product and assist in differentiating against the competition. Earlier this year, you received published pricing and technical information for Port Strainers and Insulation Kits.
Double Wall Plate Heat Exchangers
The Monday Morning Minutes of the last two weeks introduced some differences between plate heat exchangers. Two of the products featured were the double wall plate & frame and double wall brazed plate heat exchangers. We have received many calls regarding these models and Michigan and Ohio plumbing codes. The plumbing code is very specific in its
Not All Plate Heat Exchangers Are Gasketed!
Last week we introduced three varieties of Bell and Gossett gasketed plate heat exchangers. Today, we look at three types of brazed plate heat exchangers. A brazed plate exchanger is a plate exchanger without gaskets or rolled joints. The plates are brazed so there are no elastomers. Brazed heat exchangers are generally available in smaller sizes than
Not All Plate Heat Exchangers Are Alike!
Often times when designing a HVAC or Industrial Process system we use unfired heat exchangers. Our choices vary between shell and tube design or plate/frame design. The next few Monday Morning Minutes will offer a glimpse of the variety of plate type exchangers. Today let’s look at three gasketed plate heat exchanger designs and the application of
Centrifugal Pumps – “Clipping the Tips”
R. L. Deppmann regularly receives questions when a field problem pops up. Here is an example call from an industrial user with a pump issue. There is an existing Bell and Gossett model 1510-5BC with a capacity of 1000 GPM at 60 foot head using a 25 HP, 1750 RPM motor and a 9” cut impeller.
Centrifugal Pump Selection Specifying Future Conditions
In the last R. L. Deppmann Monday Morning Minutes, we suggested a specification that would allow a future impeller change as a means of adding some safety factor to the pump provided on your project. What happens if you want to select a pump with a present and future condition? Here is a good pump selection for a capacity of 2700 GPM at 100 foot head using a 100 HP 1750 RPM motor.
Constant Speed Pumps and Maximum Impeller Concerns
How many times have you, as an engineer, looked at a number of curves and passed up a few because you did not like something about the selection on that curve? In the last R. L. Deppmann Monday Morning Minute we looked at end of curve selections. Today we examine pump selections near the top of the…
Centrifugal Pump Selection Maximum Point on the Curve
How many times have you, as an engineer, looked at a number of curves and passed up a few because you did not like something about the selection point on that curve? In the December 6, 2010 R. L. Deppmann Monday Morning Minutes, we look at how to specify and schedule pumps to limit the bidders to to specific pump curve characteristics.
Pump Selection – Flat vs. Steep Curves
An engineer in Michigan called about a large project with several pumps being selected in parallel for a plant chilled water system. He commented that the Bell and Gossett pump curves are flat vs. processing pumps which often times are steep. His question was, “Why are B&G curves so flat?” I’ve not heard this comment for many years. What did he mean? The term steep curve comes from the process industry. This old term refers to a large change in pump head with a small change in flow rate.
Large Centrifugal Inline Pump Installation
In our last Monday Morning Minute, we suggested using the Base Mounted Bell and Gossett series 1510 series end suction or VSX series double suction pumps when the design capacity requires over 10 HP. We do occasionally see our series 80 and series 80-SC inline pumps specified in applications up to 100 HP. Often the reason used for this application is limited floor space. Today let’s examine floor space required by these pumps.