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06 Master Equipment List (MEL)

Why: Purpose

The master equipment list (MEL) is the means to track progress and ensure the process addresses all of the required equipment and systems.   Knowing all of the equipment and systems and keeping an accurate count provides the foundation for calculating the sampling to be executed by the commissioning agent.  For example, if the owner elected to have the commissioning agent backcheck a sampling rate of 10% of the prefunctional checksheets, it is necessary to have a full count and inventory of the equipment.
 
As a tracking/ progress measurement tool, the commissioning agent can set up tools such as spreadsheets or databases to indicate which step in the process each system or equipment has reached.  This will aid in determing if the next step in the process is ready to be executed.  For example, when all of the chilled water equipment have passed the prefunctional checksheets and been balanced, then functional testing can proceed.
 
Without an accurate tracking mechanism it will be difficult if not impossible to ensure the commissioning process is progressing correctly and thoroughly.  These metrics can also be used to update the commissioning plan and schedule. 

What: Included Information

 A master equipment list should be thorough and complete.  Typical base information includes:
  • Equipment Tag
  • Equipment Type
  • Manufacturer
  • Model Number
  • Location
    • Building
    • Floor
    • Room
  • Picture of Equipment
  • Service (Chilled Water, Supply Air, Etc)
  • Status
  • Other Relevant Nameplate Data
    • Voltage, Phase, Hz
    • Horse Power
  • Other Design Data
    • Flow rate (Air, Water)
    • Capacity (Cooling, Heating)
    • Operating Parameters

When: Project Phase/ Task Timing

The master equipment list can be developed and populated in the design phase when the engineering changes are at a minimum.  For example, this could be at approximately 75% design.  The master equipment list will be needed as a reference when developing the commissioning specifications in order to determine the different prefunctional checksheets needed. 
 
During construction, the list will need to be amended to reflect "As Submitted" and then "As Installed" conditions if they differ from the design. 

How: Development Sources

The initial master equipment list will be developed from the design documents such as the engineered drawings.  Additional data will be pulled from the Owner's Project Requirements as well as the project specifications.
 
If not included in the engineered design documents, additional data can be pulled from the vendor or manufacturer cutsheets used during the design.

Who: Team Members Involved

The master equipment list is developed and populated by the commissioning agent but data will need to be coordinated with the architect and engineering team as well as the equipment vendors.
 
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