SOP Slide Gate Timing and Pneumatic Setup

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Standard Operating Procedure
Subject:
SOP Slide Gate Timing and Pneumatic Setup
Author:
Troy Humphrey
Approved by:
Don Warf

Contents

Objective

The objective of the SOP is to give the reader an insight on how a slide gate works and common practices for setting up and timing a slide gate.

Scope

This SOP is directed toward PSMFC O&M personnel and is intended to provide a common reference that can be used when a slide gate needs to be set up and timed. The slide gates are controlled by a PLC. The PLC is interfaced via an HMI (Human Machine Interface), typically a Allen Bradley Panel View 300 (PV300). Requests to open (RTOs) can be manually issued using the test button near each gate or remotely issued via the site platform. The site platform will allow the user to manually activate the gate and it will automatically send RTOs to the PLC depending on the data received by the transceivers that control the gates disposition.

Responsibilities

PSMFC O&M personnel are responsible for setting up and timing the gates. Gate maintenance and repair is the responsibility of the COE.

Procedure

Typical Operation

Below is a link to a pdf that shows the sequence of events that occur when a slide gate receives a RTO. Click on the link and then scroll through the graphics to watch the sequence or step through the graphics below.

Visio-SlideGateSequence.pdf


Image:SlideGateClosed.jpg


SLIDE GATE CLOSED

This graphic is of the gate in the closed position. Slide gates are typically closed until an RTO is received.



Image:SlideGateOpening.jpg


SLIDE GATE OPENING

This graphic is of the gate traveling open.



Image:SlideGateSoftOpen.jpg


SLIDE GATE 'SOFT OPENING'

This graphic is of the gate 'soft opening'.



Image:SlideGateClosing.jpg


SLIDE GATE CLOSING

This graphic is of the gate traveling closed.



Image:SlideGateSoftClose.jpg


SLIDE GATE 'SOFT CLOSING'

This graphic is of the gate 'soft closing'.



Image:SlideGateClosed.jpg


SLIDE GATE CLOSED

This graphic is of the gate closed again.



Setting the Travel Open and Travel Close Times

NOTE: IF the gate you are setting up has sensors install either disable the sensors prior to set up using the PV300 (See Sensor Install SOP ) or ensure that the gate is fully closed each time before pressing the test button.

  1. Ensure that the air pressure is set at 85-90 PSI.
    • GRJ Slide Gates A, B and E run at 70 psi.
  2. Ensure that the soft close/open regulator is at least ½ way down.
  3. Position yourself so that you can see the gate move when you press the test button.
  4. Press the test button and observe the gate.
  5. If the gate slams open decrease the travel open time.
  6. If the gate stops opening before it is 6-7 inches from being fully open increase the travel open time.
    • Too short of a travel open time could make it look like the travel close time is too long by stopping the gate from opening far enough thus decreasing the distance it needs to travel closed.
  7. If the gate slams closed decrease the travel close time if you are sure the travel open time is set correctly.
    • If the ‘soft closed’ engages before the gate is fully closed but is still slamming shut then an adjustment to the soft close/open regulator is required.
  8. Continue to adjust the travel open and travel close times until the soft close/open regulator is engaging at the following distances.
    • Gate traveling open ~ 6 inches from being fully open.
    • Gate traveling closed ~ 6 inches from being fully closed.
  9. Once the soft close/open regulator is engaging at the proper distance screw the regulator adjustment clockwise to increase the back pressure which should result in a stiffer soft close and soft open.
    • Ideally the gate will stop 6 inches from being fully open and start to soft close 6 inches from being fully closed with a smooth slow travel the last 4-6 inches.
    • If the gate does not reach the fully closed position by the time the shutdown timer times out the gate will slam the remaining distance. Typically if this is happening the soft close/open regulator is to stiff.



Setting the Delay before Operate Time

  1. The Delay Op is the time the PLC waits to start the open sequence from the time the RTO is received.
  2. Sticks are used to set the Delay Op or Delay before Operate Time.
  3. The Delay Op can be calculated by using rate of flow and the distance from the last coil to the leading edge of the gate.
    • Using the milliseconds on Multimon you can calculate the rate at which the water is flowing by measuring the distance between the coils and calculating the time from coil to coil by subtracting the millisecond time stamp of a PIT Tag as it is read on each coil. You then use the following formula to calculate the rate.
    • Rate=Distance/Time
  4. Use the Distance from the last coil to leading edge of the gate in the following formula to calculate the time.
    • Time=Distance/Rate.
  5. In most cases the Delay Op is set from the previous year. If the water flow changes significantly and the site site biologist confirms that the flow you are seeing will remain that way for some time then an adjustment to the Delay Op will be required.
    • If the flow is reduced the Delay Op will need to be increased.
    • If the flow is increased the Delay Op will need to be decreased.
  6. A good Delay Op drops the stick in the center of the gate opening. If the Delay Op is too long the stick will be missed or drop through in the down stream section of the gate. If the Delay Op is too short the stick will be missed or dropped in the up stream section of the gate.



Setting the Time Open

  1. Sticks are used to set the time open initially. DGE results are then used to fine tune the time open.
  2. When a stick is thrown you want to ensure that the gate is open long enough to catch the stick and should close as soon as the stick has been caught. The reasoning behind this is:
  • If the time open in too great your 'by catch' or number of extra fish that are caught as the result of the gate opening to catch the fish you want will increase.
  • If the time open is too short you may not be open long enough to catch the fish you want and your effiencies will go down.

References


Contact PSMFC at (509) 735-2773

Name Extension
Don Warf 1
Scott Livingston 2
Darren Chase 3
Alan Brower 4
Troy Humphrey 5
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