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Net Positive Suction Head (NPSH) Part 1 of 5 – Terms and Definitions

Norm Hall December 7, 2020NPSH, Monday Morning Minutes, Pumps, NPSH, Commissioning and Balance, Pumps, Cooling Towers, Pumps

One of the most misunderstood concepts in pump selection for hydronic design is the net positive suction head or NPSH. Problems with NPSH can spell …

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tower system
tower system

Open Cooling Tower System Pumps – Balancing the Pump Using a Drive

Norm Hall June 8, 2020Commissioning and Balance, Commissioning and Balance, Pumps, Monday Morning Minutes, Pumps, Variable Speed

Open cooling tower pumps are traditionally operated as constant speed. When balanced, the extra pump head or over-heading is throttled across the discharge balance valve …

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Balancing & Trimming Hydronic Constant Speed Pumps

Norm Hall June 1, 2020Monday Morning Minutes, Pumps, Commissioning and Balance, Commissioning and Balance, Pumps

The HVAC hydronic system is proportionally balanced per ASHRAE 90.1 energy standards. The proportional balance, when properly completed, will result in all the extra pump …

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circuit setter balance valve
circuit setter balance valve

Hydronic Pump Energy Savings and Proportional Balancing Technique

Norm Hall May 25, 2020Commissioning and Balance, Commissioning and Balance, Proportional, Monday Morning Minutes, Pumps

ASHRAE Energy Standard 90.1 indicates the hydronic system shall have proportional balance and the pump over-heading shall be removed through speed reduction or impeller trimming. …

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Bobco Package
Bobco Package

Centrifugal Pump Gauge Readout: Adjustments to Balancing for Glycol Temperature

Norm Hall November 11, 2019Monday Morning Minutes, Pumps, Commissioning and Balance, Commissioning and Balance, Pumps, Glycol and Water Quality, Corrections, Corrections

Glycol correction factors were the subject of many of the last few R. L. Deppmann Monday Morning Minutes. While writing these articles, I thought about …

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Bobco Velocity Head Corrections
Bobco Velocity Head Corrections

Centrifugal Pump Gauge Readout Corrections for Hydronic Glycol Systems

Norm Hall November 4, 2019Corrections, Monday Morning Minutes, Pumps, Commissioning and Balance, Commissioning and Balance, Pumps, Glycol and Water Quality, Corrections

Ask any test/balance or service technician in the hydronic HVAC world to convert PSIG to feet of head and the multiplier of 2.31 is the …

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Bobco Velocity Head Corrections
Bobco Velocity Head Corrections

Centrifugal Pump Gauge Readout Corrections-Velocity Head Corrections

Norm Hall October 28, 2019Commissioning and Balance, Pumps, Corrections, Monday Morning Minutes, Pumps, Commissioning and Balance

We recently had an inquiry from an engineer who was concerned about pump operation compared with the submitted pump curve. It appeared from the balance …

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hammer
hammer

Balancing HVAC Hydronic Systems Part 3: Flow Measurement Valves

Norm Hall August 20, 2018Monday Morning Minutes, Flow Measurement, Commissioning and Balance, Hydronic System Design, Test and Balance, Flow Tolerance

The flow balance of a hydronic system is a critical component in the commissioning of an HVAC hydronic system. The common balance and flow measurement …

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control valve simple hydronic system
control valve simple hydronic system

Balancing HVAC Hydronic Systems Part 2: Control Valves vs. Balance Valves

Norm Hall August 13, 2018Flow Tolerance, Balance, Monday Morning Minutes, Valves, Commissioning and Balance, Hydronic System Design, Test and Balance

There are some engineers who challenge the use of balancing valves at all in hydronic systems. If the control valve throttles the flow to satisfy …

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flow tolerance hvac hydronic system
flow tolerance hvac hydronic system

Balancing HVAC Hydronic Systems Part 1: Flow Tolerance

Norm Hall August 6, 2018Monday Morning Minutes, Commissioning and Balance, Hydronic System Design, Test and Balance, Flow Tolerance

The flow tolerance of a hydronic system is a critical component in the commissioning of an HVAC hydronic system. Should the balance report match the …

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  • Products
    • Overview
    • Pumps and Accessories
    • Boilers and Water Heaters
      • Water Heater Stock
      • Boiler Stock
    • Hydronic Systems
    • Plumbing Systems
    • Steam and Condensate
    • Variable Frequency Drives (VFDs)
    • Glycol Solutions
    • Snowmelt Designs
  • System Design
    • Overview
    • Project Gallery
    • Selection and Design Tools
  • Water Solutions
  • Contractors
  • Service & Parts
    • Overview
    • Startup and Warranty
    • Parts
    • Service and Maintenance
  • Education
    • Overview
    • Basic Hydronic Blog Articles
    • Training Opportunities
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  • About RLD
    • Overview
    • Team Deppmann
    • R.L. Deppmann Locations
    • Careers
    • Community Engagement
    • Press and News