How to Control a Remote Pump for a Natural Gas Pipeline
An Acromag Solutions Video Application Note
A natural gas pipeline has a remote pumping station a mile away and they need to be able to adjust the pumping rate without driving to the site. The pump is controlled by a variable frequency drive. Running control wire is too expensive and also undesirable due to potential surges from lightning strikes.
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Click on the AcroMaggie video below to learn how to control a remote pump for a natural gas pipeline.
Must be able produce a 0 to 800 Hz signal wirelessly one mile away in a UL rated Class 1 Division 2 Groups A, B, C & D hazardous area.
Implementing the Solution:
To easily and economically solve this problem, we paired the Vertu® VWB2201 point-to-point wireless bridge and VPM2211 input loop-powered panel meter.
- The VWB2201 wireless bridge receives a 4 to 20 mA signal from the SCADA system in the control room.
- A mile away, above the pumping station, the secondary VWB unit recreates the signal.
- The 4 to 20 mA signal is then run down to the VPM2211 panel meter. The panel meter has two open collector outputs that can be scaled to output a frequency of 0 to 1 kHz based off of the 4 to 20 mA input.
- The VPM2211 panel meter also meets the UL Class 1 Division 2 hazardous location requirements.
- The panel meter display can be configured for frequency, percentage, or cubic feet per minute. This way, when workers are onsite, they can see the pumping rate.
VPM2211: Vertu Panel Meter: digital display, IS, loop-power
VWB2201: Vertu Point-to-Point Industrial Wireless System
Why Acromag for this I/O Solution:
The VWB2201 can transmit a 4 to 20 mA signal, four discrete I/O points, as well as a Modbus RTU RS485 signal up to 500 feet indoors, or one mile outdoors (with no obstructions). Optional Yagi antennas can also extend those distances. The VPM2211 saves cost by combining a transmitter and display in one unit. There are other models with additional features for relay or analog outputs, but they were not needed for this application. Not paying for these unneeded features helps keep the cost down. In addition, the VPM2211 has all the UL certifications required. Acromag, your I/O experts for over 60 years.