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Tray Fill Time Inspection

The purpose of a maintenance inspection is to determine what tools, materials, and labor are needed to keep them in good working condition. This will help you identify equipment issues and their performance gaps, allowing for timely maintenance attention and avoidable costly repairs.

Hardware

01/10/2024

Tray Fill Time Inspection

The purpose of a maintenance inspection is to determine what tools, materials, and labor are needed to keep them in good working condition. This will help you identify equipment issues and their performance gaps, allowing for timely maintenance attention and avoidable costly repairs.

Override the Rack's solenoid to test ON, and then override the zone's main pump ON. Make sure the concerned solenoid is the only solenoid open for the duration of this test.

As soon as water starts pouring out of the rack's supply manifold, time how long it takes for the tray's standpipe to breach (water overflows through the center hole).

If tray fills in less than 6 minutes, follow the standpipe inspection procedure.

Standpipe Inspection

Inspect stand pipes on the flood rack.

Verify Standpipe drain holes are clear of debris, such as plant roots, leaves, plug media, and algae.

Verify Standpipe overflow holes are clear of debris, such as plant roots, leaves, plug media, and algae.

Otherwise, if notable debris accumulation has occurred or the standpipe is lined with biofilm or algae, follow the standpipe cleaning procedure.

Standpipe Cleaning

Clean Standpipe drain and overflow holes using a long thin brush (drinking straw cleaner brush).

If tray fills in more than 7 minutes and 30 seconds, follow the PCV's quantitative flow check procedure.

PCV Flow Inspection (Quantitative)

Obtain a graduated container that can hold at least 500 mL, and can be easily manipulable (jug, cylinder, etc).

Override a solenoid ON, and override irrigation ON.

Let irrigation run for at least 1 minute to let the circulation loop fill up.

For each of the PCVs, follow these steps to measure the PCV's flow.

Set up a stopwatch app on your smartphone.

Simultaneously hit start on your stopwatch and place the jug directly under the PCV's union.

As the stopwatch hits 10 seconds, immediately remove the container and stop collecting water.

Below are fields to input the amount of water collected in mL. If your container is graduated with a different unit, use a converter to convert them to mL.

NOTE: The following are grading criteria for each value.

Pass: 303 mL is the minimum amount for a rack to operate within safe guidelines, and it corresponds to 0.8 GPM, this accounts for predictable pressure losses. The "perfect", lossless value would be 379 mL for a PCV to be working in perfect condition, which corresponds to 1 GPM, though this is rarely the case.

Flag: Between 303 mL and 265 mL (0.8-0.7 GPM) the PCV is notably underperforming, but the flow is still within the safety margin and no immediate action is required at this time (trays will still flood). The issue should be flagged and addressed with moderate priority.

Fail: Lower than 265 mL (0.7 GPM) means the PCV is in need of cleaning, and if necessary, replacement. Follow these two procedures in order to address the issue.

PCV Cleaning

Using two hands (or possibly aiding yourself with an appropriate hand tool), untighten the union that holds the PCV (pressure compensating valve) in place.

Remove the pressure compensating valve is free of debris or biofilm by lightly brushing both sides and subjecting it to a moderate pressure hose.

If debris cannot be removed or the device is visibly damaged, follow the PCV Replacement procedure.

PCV Replacement

Using two hands (or possibly aiding yourself with an appropriate hand tool), untighten the union that holds the PCV (pressure compensating valve) in place.

Dispose of the used PCV and install a new PCV in its place, in the same orientation as the removed one. After ensuring the union's male side still has the O-ring installed, tighten the union.

If this replacement was warranted by flow issues, perform a quantitative PCV flow assessment following this procedure to ensure flow is restored to specifications.

PCV Replacement

Using two hands (or possibly aiding yourself with an appropriate hand tool), untighten the union that holds the PCV (pressure compensating valve) in place.

Dispose of the used PCV and install a new PCV in its place, in the same orientation as the removed one. After ensuring the union's male side still has the O-ring installed, tighten the union.

If this replacement was warranted by flow issues, perform a quantitative PCV flow assessment following this procedure to ensure flow is restored to specifications.

TOP LEVEL, LEFT - Captured Water (mL)

TOP LEVEL, LEFT - Assessment

Pass
Flag
Fail

TOP LEVEL, RIGHT - Captured Water (mL)

TOP LEVEL, RIGHT - Assessment

Pass
Flag
Fail

MIDDLE LEVEL, LEFT - Captured Water (mL)

MIDDLE LEVEL, LEFT - Assessment

Pass
Flag
Fail

MIDDLE LEVEL, RIGHT - Captured Water (mL)

MIDDLE LEVEL, RIGHT - Assessment

Pass
Flag
Fail

BOTTOM LEVEL, LEFT - Captured Water (mL)

MIDDLE LEVEL, LEFT - Assessment

Pass
Flag
Fail

BOTTOM LEVEL, RIGHT - Captured Water (mL)

MIDDLE LEVEL, RIGHT - Assessment

Pass
Flag
Fail

Source: Hardware (Community Member)

Please note that any procedure, checklist, or other document available in the MaintainX Procedure Hub is provided for general education and information only and does not constitute legal, medical, or financial advice. MaintainX makes the materials available AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any such use, including compliance with applicable law and with meeting any conditions of product warranties.

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