SOP Rotating Gate Timing and Pneumatic Setup

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Standard Operating Procedure
Subject:
SOP Rotating Gate Timing and Pneumatic Setup
Author:
Troy Humphrey
Approved by:
S.Livingston 12/22/08

Contents

Objective

The objective of the SOP is to give the reader an insight on how a rotating gate works and common practices for setting up and timing a rotating 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 rotating gate needs to be set up and timed. The rotating 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(s) 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 2-Way

The graphics below shows the sequence of events that occur when a 2-Way rotating gate receives a RTO. The graphics below should also be used as a reference when plumbing the pneumatic lines from the SOL to the gate cylinder(s).


Image:Visio-2 Way Rotating Gate SOL 2 ON.jpg


2-WAY TDC

This graphic is of the gate in the default or straight position. 2-Way rotating gates are typically Top Dead Center TDC until an RTO is received.



Image:Visio-2 Way Rotating Gate SOL 1 ON.jpg


2-WAY ROTATED RIGHT

This graphic is of the gate turned to the right.


Typical Operation 3-Way

The graphics below shows the sequence of events that occur when a 3-Way rotating gate receives a RTO. The graphics below should also be used as a reference when plumbing the pneumatic lines from the SOL to the gate cylinder(s).


Image:Visio-Rotating Gate No SOLs ON.jpg


3-WAY TDC

This graphic is of the gate in the default or straight position. 3-Way rotating gates are typically Top Dead Center TDC until an RTO is received.



Image:Visio-Rotating Gate SOL 1 ON.jpg


3-WAY ROTATED LEFT

This graphic is of the gate turned to the left.




Image:Visio-Rotating Gate SOL 2 ON.jpg


3-WAY ROTATED RIGHT

This graphic is of the gate turned to the right.


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 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. The Delay Op should be set so that the stick is in the center of the gate when the gate has rotated 1/2 of it's total rotation. If the Delay Op is too long the stick will be missed and continue down stream. If the Delay Op is too short the stick will be missed and continue down stream.



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 divert the stick and should close as soon as the stick has been diverted. The reasoning behind this is:
    • If the time open in too great your 'by catch' or number of extra fish that are diverted as the result of the gate opening to divert the fish you want will increase.
    • If the time open is too short you may not be open long enough to divert the fish you want and your efficiencies will go down.
  3. If you have a 3-way gate you will have to set the time open for both directions.

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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