Embedded Files
This Policy is completed and is waiting Field Service, Engineering, & Safety approval.
Purpose
Purpose
The purpose of this procedure is to establish the minimum requirements for setting up the Speed Control Mode on Gas Engine Drive units in the LOGIX control panel. The procedure applies to all Gas Engine Drive LOGIX panels equipped with the Speed Control Mode option. This procedure is to ensure the proper set up of the Speed Control Mode to ensure full PLC control of RPM in the LOGIX panel as laid out in this procedure.
Procedure
Procedure
This procedure applies to all Gas Engine Drive units that are equipped with the LOGIX panel that has the Speed Control Mode option currently in service in the Field, Test Loop, at a Repair Shop, or in Storage Yards. Flogistix Service Technicians will perform the set up of the Speed Control Mode in the LOGIX panel as laid out in this procedure according to this procedure.
Before any work is performed a JSA needs to be done according to Flogistix procedure along with any Customer requirements before any work is started.
To set up the Speed Control Mode settings in the LOGIX panel you must first be logged into the LOGIX panel under an Mechanic Level or higher
To properly set up the panel to correctly control engine RPM start at the Home Screen of the LOGIX panel. In the bottom right corner of the Home Screen you will need to select the type of control desired by the PLC.
This is done by selecting one of the bottom two yellow boxes either Engine Speed Operation Mode or Loading Valve Operation Mode.
As in this example all boxes are in Manual settings Mode
After touching either the Engine Speed Operation Mode or the Loading Valve Operation Mode an Orange Operation Mode Screen will appear.
When the Operation Mode Screen appears the four set modes will need to be properly set for the type of desired operation of the compressor unit.
The settings for the four options Governor Mode, Engine Speed Mode, Loading Valve Mode, and Bypass Valve Mode need to be set
Governor Mode
Engine Speed Mode
Load Valve Mode
Bypass Valve Mode
Governor Mode – There are three choices Idle, Setpoint, or Max. This is the Engine RPM set point that the engine will run at.
If selecting Idle as in the example above the unit will only run at Idle RPM where the Minimum RPM is set at in the PLC on the Machine Specific page.
If selecting Setpoint the unit will control from the Idle RPM setpoint in the PLC to where the RPM speed is set at in the Eng Speed Setpoint box indicated by the red arrow. As in this example the PLC will control from minimum Idle RPM as set in the PLC to 2200 RPM as set in the Eng. Speed Setpoint.
Selecting Setpoint can also be used if you want to limit how high the RPM of the unit will run at for specific well conditions.
As in this example the PLC will control from minimum idle RPM as set in the PLC to 1950 RPM as set in the Eng. Speed Setpoint box
Selecting Max the unit will run from where the Minimum RPM set point is in the PLC to the Maximum RPM set point in the PLC.
** This is the desired setting for full PLC control of RPM when Engine Speed Mode is set at every Mode except Manual
Engine Speed Mode - There are multiple choices in the Engine Speed Mode - Manual, Auto, VRU, Multi-Stream, Plunger Lift.
In the Manual setting - there will be no varying speed control by the PLC, it will only run the unit to the RPM at the Idle, Setpoint or Max setting in the Governor Mode setting box.
As in the example above the unit RPM would be at the Max RPM setting because the Engine Speed Mode is set to Manual and the Governor Mode is set to Max.
In Auto setting the PLC controls Suction pressure off of the Transmitter on the Inlet vessel of the unit. The PLC will control RPM to try to control the Suction Pressure target setpoint from the Auto Load Page at the RPM ranges of either Idle, Setpoint or Max settings from the Governor Mode settings box.
In VRU setting the PLC controls pressure from a remote transmitter that is assigned to the Tank Vapor Pressure in the Analog Setup page. The PLC will control RPM to try to control the Tank Vapor Pressure target setpoint from the Auto Load Page at the ranges of either Idle, Setpoint or Max from the Governor Mode settings box.
In Multi Stream setting the PLC controls pressure from two sources the transmitter on the inlet vessel and from a remote transmitter. - The PLC will control RPM to try to control Tank Vapor Pressure and Suction Pressure target setpoint from the Auto Load Page at the ranges of either Idle, Setpoint or Max from the Governor Mode settings box.
In Plunger Lift setting - The PLC will control RPM to try to control Suction Pressure target setpoint from the Auto Load Page at the ranges set from either Idle, Setpoint or Max from the Governor Mode settings box.
Loading Valve Mode – There are multiple choices Manual, Auto, VRU,Multi-Stream, Plunger Lift. Loading Valve Mode acts basically the same as Engine Speed Mode except there are dead bands.
For most cases Engine Speed Mode and Loading Valve Mode need to be set with the same Mode setting for all five settings.
Bypass Valve Mode – This controls when the supply pressure to the Bypass Pilot controller is turned on. The set positions are Off, Always On, Auto, VRU, Multi Stream.
If set other than Off all Bypass Valve control settings to control when supply pressure will open will need to be done on the Bypass_Valve_Page from the Settings Page.
As in the example below the setting is set to Auto, when set to Auto the bypass valve supply pressure will be controlled from the pressure of the Inlet vessel
If set to Always On the Bypass supply pressure to the bypass valve will always be turned On no matter how the other settings are set at in the Engine Speed Mode or Loading Valve Mode.
When set to VRU the bypass valve supply pressure will be controlled from the pressure of the remote Transmitter.
When set to Multi Stream the bypass valve supply pressure will be controlled from the inlet pressure and the pressure of the remote Transmitter.
When set to Plunger Lift the bypass valve supply pressure will be controlled from the pressure of the inlet Vessel.
Examples for Auto and VRU Operation Modes
This example below is an example of the desired settings of the Operation Mode screen showing all four of the Modes to achieve full PLC control when in Auto mode to control off of Suction/Inlet pressure of the compressor.
This example below is an example of the desired settings of the Operation Mode screen showing all four of the Modes to achieve full PLC control when in VRU mode to control inlet pressures off of Tank Vapor Pressure or from a remote pressure transmitter.
Responsibilities
Responsibilities
Management - Management is responsible for implementing, supporting, and enforcing the requirements of this procedure to their respective locations/area.
EHSS - Responsible to assist in the implementation of this procedure and to review for effectiveness.
Employees, Contractors, Vendors, ETC. - Are responsible to follow the requirements outlined in this procedure and ask for assistance
Scope
Scope
This procedure applies to all Flogistix Gas Engine drive compressor units equipped with a LOGIX control panel with the Speed Control Mode option and are applicable to all Flogistix employees, contractors, and temporary employees.
Hazards
Hazards
Employees should be aware that units could contain flammable and toxic gasses. Potential for the possible hazards of gas ignition or fire, hot surfaces & fluids, rotating equipment. Risk of possible concentration of H2S. Hazardous gases could be in the units pressure vessels, cooler, or associated piping and risk of inhalation of hazardous gas fumes.
Safety
Safety
All Personal Protective Equipment (PPE) for normal Field Mechanical duties apply for this procedure.
Four Gas Monitor, which is outlined in the Flogistix EHSS Manual, PPE Section 8, Procedure 8.3
This procedure applies to all units in service in the field, at a service shop, or in any storage yard.
Insure Flogistix personnel have proper safety certification or site orientation if required by the Flogistix Customer.
Insure Flogistix personnel adhere to all Customers safety practices.
Training
Training
All employees shall be initially trained on the following topics:
Employee Personal Protective Equipment (PPE)
Lock Out Tag Out (LOTO) procedure according to Flogistix policy
Emergency and First Aid procedures
Methods and Observations that may be used to detect the presence or release of a hazardous chemicals or gas in the work place
Basic LOGIX panel training
Tools & Equipment Required
All employees performing this procedure shall be required to have the listed tools to perform job tasks:
All required PPE according to Flogistix Safety Policy
Approvals
Field Service approved by:
Date:
Engineering approved by:
Date:
EHSS approved by:
Date:
Page updated
Report abuse