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I have a 15 psig steam system which operates at about 7 PSIG most of the time. Is the Hoffman Main Steam Vent Model 75 appropriate for this application with its listed 15 psig maximum? [Read More...]

When you use the word vacuum with most people, they think of sucking something up like a vacuum cleaner does. There are times that vacuum condensate systems were used to lift or “suck up” the condensate from a lower level. Today, we will examine the use of vacuum condensate pumps to lift condensate from a low return. [Read More...]

Printer Friendly (PDF) We began a series about vacuum condensate units and introduced one of their uses: the reduction of time to bring a building up to temperature after a weekend setback. Today, the R. L. Deppmann Monday Morning Minute (MMM) looks at the second use of vacuum condensate pumps, temperature control. The modern hydronic boiler systems incorporate temperature set [Read more...]

Every heating season we get, at least, a half dozen calls with the question above, which is the subject of today’s R. L. Deppmann Monday Morning Minute. Vacuum condensate transfer pumps exist in many older steam heating systems. There were many reasons contractors and engineers used these pumps but most of the systems fall into three categories: time control, temperature control, and condensate lift. [Read More...]

Our Monday Morning Minute (MMM) in September outlined the value and need of using Bell and Gossett triple duty valves in variable speed pumping applications. The use of the triple duty valve ports will make it easier to determine the maximum speed to set in the drive. [Read More...]

Xylem Bell and Gossett recently announced the new System Syzer programs for your computer. You may download these through links on our website at the www.deppmann.com/resources/ page. This new tool has a powerful lineup of useful features. Let’s look at a couple of them. Continued from Part II [Read More...]

Xylem Bell and Gossett recently announced the new System Syzer programs for your computer. You may download these through links on our website at the www.deppmann.com/resources/ page. This new tool has a powerful lineup of useful features. Let’s look at a couple of them. Continued from Part I [Read More...]

Xylem Bell and Gossett recently announced the new System Syzer programs for your computer. You may download these through links on our website at the www.deppmann.com/resources/ page. This new tool has a powerful lineup of useful features. Let’s look at a couple of them. [Read More...]

R. L. Deppmann is offering another series of seminars, this fall, which are centered on “Energy Savings and ASHRAE 90.1 and 189.1 standards”. During a couple of the first 7 seminars, the question of the air separation location sparked a short discussion. Let’s review the response in this Monday Morning Minute. [Read More...]

Every week a question comes in to R. L. Deppmann about the minimum flow rate through pumps. In hydronic heating and cooling systems, it is normal to have 2-way valves in the system at the terminal units. As the system temperature is satisfied, the valves close and the flow rate drops from design toward zero flow. If all of the valves were closed, we would be at “dead-head” pump operation or zero flow rate. [Read More...]