Centrifugal pumps are the “heart” of hydronic heating, cooling, and plumbing systems. Over the next few weeks, the R. L. Deppmann Monday Morning Minutes features some basic and advanced pumping topics. Let’s start with a quick review of the information contained on the pump curve. For our example, we will use an ITT Bell and Gossett model 1510 end suction base mounted centrifugal pump model 5E with a nominal speed of 1750 RPM. The horizontal axis is flow rate in GPM or gallons per minute of water. [Read more…]
Heat Added to Chilled Water Systems Due to Pump Efficiency
We received an interesting question this week from a consultant engineer: “How much temperature increase will I get in the chilled water from the pump? My secondary chilled water pump has a capacity of 1400 GPM at 100 feet” Let’s look at the answer. ANSWER: Centrifugal pumps in hydronic systems do the work of moving gallons per minute of fluid against a differential head in feet. This work is defined as Brake Horsepower (BHP) also expressed in equation 1. [Read more…]
Motor Specifications for HVAC & Plumbing Building Trades
Printer Friendly (PDF) The most frequently asked question is “How do I specify the right motor for variable speed applications”? Let’s start by referring to …
Motor Specifications for HVAC & Plumbing Building Trades
Printer Friendly (PDF) Thought I’d take break from the Sump and Sewage pump subject of the last few weeks and spend a little time talking …
Sump and Sewage Lag Pump & Alarm Float Settings
Printer Friendly (PDF) We presented suggestions for the pumps off float level and the lead pump on float level in the last few articles. You …
Pump Guide Rail Assemblies and Sump Diameter
Printer Friendly (PDF) One universal fact about sump and sewage pumping systems is that no one wants to go into the sump to pull out …
Sump and Sewage Pump Float Settings
Printer Friendly (PDF) There are basically four float control schemes used in sump and sewage pump applications. Simple one pump sumps normally have a single …
Sump and Sewage Pump Minimum Submergence
We now begin a Monday Morning discussion about pumps, controls, and sumps. This article addresses a basic, but important question, which comes up often when …
Sump and Sewage Pumps – Discharge Line Size
Printer Friendly (PDF) There are several considerations when selecting the discharge line size from a sump or sewage pump. The discharge line must be large …
Sink Drainage Systems
Printer Friendly (PDF) You are involved in a renovation project where the owner wants to add a sink in the lowest level of the building …