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Power source must be disconnected before working on equipment. Failure to disconnect power source could result in injury or death. |
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The CPS361 Cement Pumper can be located where the air is contaminated with sufficient quantities of volatile gases to create an ignition hazard. The air purge system is designed to remove these gases from the electronic enclosures to eliminate the risk of a spark causing an unexpected ignition. The air purge sequence takes 7 minutes to complete. Therefore, the CPS361 Cement Pumper should not be activated until the air purge system has been operational without fault for 7 minutes. |
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| Illustration 1 | g00554561 |
Control Console For The CPS361 Cement Pumper (1) Instrument Panel. (2) Control Panel. | |
The control system provides operation, monitoring and system protection for the CPS361 Cementer Pumper. The control system consists of the following components: control console, digital gauges, battery disconnect enclosure, protection for offshore engine wiring and a purge system. From the control console, the operator has the ability to control the front engine and the rear engine. The operator can also control the transmissions and the pumps. Digital gauges and mechanical gauges are used in order to monitor the system parameters. The control console also incorporates pneumatic toggle switches which operate piping valves. Operating these valves allows the operator to control the process of cementing.
The control system is designed to operate in a harsh environment. Precautions have been taken in order to protect the electrical controls from corrosion. As an option, the control system can be delivered with a Class I, Division II Groups C, D Hazardous Location Certification from the Canadian Standards Association (CSA).
The control system operates on 24 DCV. Power is supplied by marine batteries that are mounted on the skid. The batteries are wired into the control console in order to meet offshore regulations. Engine mounted marine alternators are provided in order to maintain battery voltage. A power supply with 24 DCV and 20 Amperes can be used in place of the batteries. However, a loss of power will cause an engine shutdown. Additionally, replacing the batteries with a power supply will invalidate CSA certification for units that have this option. See "System Components" for more information about the optional power supply.
The control console is the primary interface between the operator and the two Caterpillar 3176C Industrial Engines. From the control console, the engines can be started and stopped. The operator can also control the engine throttle. An emergency shutdown can be performed on the control console.
The digital gauges provide a digital display of the following features: discharge pressure, pump flow rate, total barrels that are pumped by the rear triplex pump and total barrels that are pumped by the front triplex pump. Additionally, the setting for the over pressure trip and the alarm signal is generated from the gauges. Both digital gauges have programmable settings. See "Digital Pressure Gauge" in Systems Operation, "Instrument Panel" for instructions on programming the digital gauges.
The battery disconnect enclosure is located directly below the control console. From this enclosure, the operator can disconnect battery power from the control system.
Note: When battery power is disconnected, all faults and events that were logged in the engine ECM will be erased.
Note: To avoid loss of memory, only disconnect battery power when there is no need for fault information from the engines.
The Caterpillar 3176C Industrial Engines have been modified in order to last in the harsh offshore environments. The following electrical modifications have been made:
- The Engine ECM has been placed inside a stainless steel enclosure.
- The standard engine harness has been replaced with marine cables.
- Mechanically protected sensors with stainless steel connectors have been provided.
System Components
The control console is mounted on the operator platform of the CPS361 Cement Pumper. The control console incorporates both electrical components and pneumatic components. From this console, the operator can control the engines, the transmissions, and the triplex pumps. The operator can monitor the engine speed, the pump flow rate, and the pump discharge pressure. The operator can set the over pressure trip for both triplex pumps. Toggle switches are provided in order to operate the pneumatic valves. The operator can control the density of the cement. The density of the cement can also be displayed. System temperatures and pressures can be monitored. An emergency shutdown can also be activated from the console.
The control console operates on 24 DCV. Batteries are supplied with the skid. The batteries are wired in order to meet offshore regulations. The batteries provide a constant voltage for the control console which is necessary to maintain operation. If the power supply is lost, then the fuel to the engines will shut off. A power supply with 24 DCV and 20 Amperes can be used in place of the batteries. However, if the power supply is operated from rig power, then engines will shut down when the rig power is lost. The use of rig power will void the CSA certification for units that have that option.
The components for the CPS361 Cement Pumper are divided into two divisions, the Front and the Rear. This refers to the location of the pump in relation to the skid. The front components identify the unit that lies toward the radiators at the front of the skid. The rear components identify the unit that is located more toward the rear of the skid. Each unit consists of an engine, a transmission, and a pump.