Losses at one or more pipes or junctions may be significantly impacted (>25%) by laminar or non-Newtonian conditions, but no correction was made

Full Message Text

Losses at one or more pipes or junctions may be significantly impacted (>25%) by laminar or non-Newtonian conditions, but no correction was made. Checking the 'Laminar/Non-Newtonian Correction Strength' output parameter is recommended. If the loss model source was from testing under turbulent conditions, applying a correction is recommended.

Explanation

Flow through one or more pipes or junctions was found to be in the laminar flow regime (Reynolds Number < 2300), but the "Apply Corrections" setting is disabled on the Laminar and Non-Newtonian Corrections panel in Analysis Setup. The "Laminar and Non-Newtonian Correction Strength" output parameter under either the Pipes or Junctions sections of Output Control was calculated to be larger than 1.25 for one or more pipes or junctions. This means that if corrections were applied, the resulting equivalent K factors and pressure losses would be significantly modified (>25%) compared to if no corrections were made.

Required Action

If the loss information used in the model was based on manufacturer data that came from turbulent tests, then the user should review the documentation for the Laminar and Non-Newtonian Corrections panel in Analysis Setup, consider enabling the setting for "Apply Corrections", and review the settings for which the corrections apply. Two scenarios can be compared, one with corrections and one without, to help determine the exact magnitude and location of the impacts. It is also recommended to review the documentation for the ATKF Method.

There is ambiguity in literature about if laminar corrections are required for fittings. A comparison of literature sources is provided, and it is up to the user to decide when/how to apply the corrections.

If the loss information used in the model was based on true laminar data, then the caution message can be disregarded.