What are Fugitive Emissions?
As gas moves through valves to various production vessels, it is typically vented by pneumatic controllers. This venting, along with incidental emissions that occur during production and transportation, make up fugitive methane gas emissions.
Methane is the primary component of natural gas, making up around 80% of the gas produced from a well.
Due to a variety of pressures, fugitive emissions are regularly on the minds of oil and gas producers, and many larger producers are setting ESG Goals (Environmental, Social & Governance) and setting targets to reduce their natural gas emissions.
Regulations play a part as well, both at the federal and state level, in particular in more regulated areas like New Mexico and Colorado.
At Kimray, we are prepared to equip you for sustainable energy production long into the future, whatever your ESG goals.
That’s why we offer several options for zero-emission production to help you keep ahead of regulations. These options include:
- Lever-Operated Liquid Dump Valves
- Non-Venting Regulators
- Electric Actuators, Controllers and Pilots
Lever-Operated Liquid Dump Valves
Lever-Operated Liquid Dump Valves work in conjunction with a trunnion and linkage rod to provide emissions-free liquid level control in separation vessels.
This simple design is reliable, easy to set up, and will stand up to harsh environments.
Non-venting Pneumatic Regulators*
Kimray pneumatic high pressure control valves and low pressure regulators can be used in common applications including back pressure regulation and pressure reducing regulation.
While our standard regulators and pneumatic control valves currently come tubed to vent, we also offer many non-venting versions.
These non-venting valves use process natural gas to supply the diaphragm and actuate the valve. Then, rather than venting the gas to atmosphere, they send the gas back into the production line.
*Note: If you already have standard regulators, you can convert them from vent to non-vent by changing the tubing. Watch our step-by-step video below.
Pneumatics with Compressed Air
Another way to avoid fugitive methane gas emissions is by using compressed air rather than supply gas to power your valves and control instruments.
With compressed air, you can continue to use pneumatic controls without emitting fugitive gasses.
1. Electric Level Switch
For high or low level shut down in your separator, you can use an electric level switch.
An electric level switch controls a small span of liquid of about 2”. This switch operates just like our pneumatic switch, except the output signal is electric rather than pneumatic.
This signal is a discrete output, which is used for on/off control. An analog signal, which we’ll discuss a little later, is used to provide modulating control.
The electric level switch covers a range of 0W to 25W of power, pairing nicely with the demands of today’s automation equipment.
Here’s how it works:
As the liquid level increases, the float is lifted, and the magnet located in the float lever moves downward and closer to the reed switch. The reed switch is in the enclosure of the body and is isolated from the process conditions. When the magnet gets close enough to the reed switch it will close it. When liquid level decreases, the magnet will move away from the reed switch causing it to open.
This level switch can be used to shut down incoming production if the liquid level is higher or lower than the float output signal position. To prevent liquid carryover the level switch is used by many producers for a high level shutdown. If a dump valve or liquid level controller fails, the rising liquid will trip the high level switch that’s positioned near the top of the vessel, shutting the inlet flow to the vessel and/or signaling an alarm.
2. Electric Level Controller
An electric level controller maintains a specific fluid level inside a separator by using an electric signal to control an electronically actuated dump valve.
The controller uses a displacer with a spring counterbalance. It is a great option for interfacing between two liquids as there is no need to weight or re-weight a float ball like in a float-operated liquid level control system.
Here’s how it works:
The displacer sits in the process fluid and senses the liquid level in your separator. When the level of that liquid increases and reaches your high set point, the Gen II responds by sending a discrete electric signal.
This signal is received by an electric valve actuator, which tells your control valve to open.
When the liquid level decreases and reaches your low set point, the Gen II responds by turning off the electric signal. The electric valve actuator then closes the control valve.
The electric Gen II features the same extension arms, displacers and other options as our pneumatic Gen II level controller. For more on that, you can watch the video linked in the description below.
3. Valvcon Electric Valve Actuator
A Valvcon Electric Actuator replaces the pneumatic actuator on control valves. It provides accurate, zero-emission control and can tie into a Programmable Logic Controller or Remote Terminal Unit for remote control/monitoring.
The Valvcon will receive a discrete or analog electronic signal from an electric level controller telling it to open and close.
A Valvcon package can be used for back pressure regulation on a separator. The smooth throttling operation of the Valvcon is great in these applications. It works with the Kimray electric pilot or other pressure controllers using an analog output signal.
4. Tritex Electric Valve Actuator
The Tritex II Actuator is a high-performance actuator and can work in the most demanding applications such as high torque and continuous actuation.
You can mount the Tritex on any size high pressure control valve with the appropriate bracket. Some of the most common applications are liquid dump valves, gas back pressure regulators, and pressure reducing valves.
The Tritex will receive an analog or discrete signal from a controller or control system and move the valve trim to the appropriate position to control the process conditions.
Both the Tritex and Valvcon Actuators have 3 key advantages over pneumatic actuators:
- Low Maintenance Operation—These long-lasting valve actuators can operate maintenance free for an extended period.
Zero Emissions—Because these actuators use electric power, they require no gas supply and do not vent any gas to the atmosphere.
Remote Communications—These actuators can tie directly into your SCADA system to provide remote monitoring and communication.
5. Electric Pilot
Currently, if you want to electrically control and remotely monitor your production processes, you need to use an RTU or PLC. These devices allow you to connect electric actuators to their microprocessor-controlled system via SCADA or another communications control network.
However, for sites or applications where only one or two valves need monitoring, the Kimray Electric Pilot is an ideal, cost-effective solution.
The Electric Pilot is a stand-alone electric controller that can control pressure, flow, temperature, or level. It can also be used in gap control and timer applications. It features an interactive screen and allows you to control process conditions without the use of computing hardware.
Here’s how it works:
The internal pilot receives a raw 4-20mA signal from a sensor, which represents a process condition. This signal could be from a pressure transducer or resistance temperature detector (RTD). That signal is then conditioned and sent to an electrically controlled valve via a proportional 4-20mA output signal.
The pilot shares a common input power source with the electric actuator and does not need a dedicated power source.
To speak with an expert about how our zero-emissions solutions can help your operation, contact your local Kimray store or authorized distributor.