I'm seeking some advice for something that should be pretty simple. I have a tendency to over-complicate, but here goes:
Background info:
I've got a project in which a water treatment plant receives water at an average rate of 1 MGD, with a max rate of 3 MGD. After standard chlorination math I've found that the chlorination system will need to be able to feed a maximum of 125 PPD. However, the plant currently has a chlorinator rated for 250 PPD. For conservative reasons I've decided to ensure that the chlorine ejector has enough supply pressure and flow to output 250 PPD, even though it really only seems like 125 PPD is sufficient.
The system has a booster pump which withdraws a water supply from the incoming water main (conveying 1-3 MGD), boosts across the ejector, and injects in the water supply main at a point downstream from the withdrawal point. I have determined that the pressure at the injection point is approximately 46 ft (20 psi). The 1" solution line from the ejector assembly to the injection point is approximately 85' with several bends and fittings.
Problem:
It's my understanding that the backpressure seen on the ejector depends on the system flow (injection point pressure + headloss from injection point to ejector). Obviously you can't calculate the headloss without knowing the system flow. So that leads me to selecting a pump. The chlorinator companies don't really dabble in booster pumps. They just say you need a particular flow and head, and I have yet to find an example online where this is gone over in detail.
I plotted the system head curve looking from the pump discharge to the injection point. I assumed that the static head condition over the pump is essentially zero (technically slightly negative), since it's taking water from a pipe under pressure and discharging it right back into that pipe. So the system head is literally controlled by friction losses. So I started plugging in flows and heads along my developed system curve to see which would be me the proper combination of ejector backpressure and supply pressure/flow. Since the system head curve will only show me the head instantaneously at the booster pump, I had to factor in flow and headlosses to the ejector inlet.
My question is, am I overcomplicating this? Or does this seem like a reasonable way to design?
https://files.engineering.com/getfile.aspx?folder=e5d7-2b8c-4a0e-afd6-7cac1fc9&file=_CHLO_Bull__reprint.pdf
The injector performance is from the manufacturer. Yes there is a large pressure drop across the ejector.
250 lbs per day chlorine = 4.7 kg/hr.
Using the chart for EJ- Ejector. 30 psi (2.07 bar) = backpressure. The chart gives a 4.5 bar (65psi) inlet pressure and 105 lpm (27.7 gpm) flow.
You are taking water from the pipe at 20 psi. (your page shows 55 psi?). The pump boosts the pressure from 20 psi to 95 psi (20 + 65 + 10). The ejector has s pressure drop of 65 psi. That leaves 30 psi on the discharge side of the ejector.
I assume you have 7 psi head loss in the discharge piping after the ejector. That would leave you with the pressure in the bypass line of 23 psi which is then discharging into the main line which has a pressure of 20 psi.
Confirm with the manufacturer that the EJ- Ejector is the correct ejector size for 250 lbs/day.
If you work in the oil and gas industry, you know how crucial pumps are to your operations. From wellhead to refinery, pumps are the workhorses that keep everything flowing smoothly. And when it comes to pumps, one type that’s especially important is the booster pump.
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But what exactly is a booster pump, and how can it benefit your oil and gas business? Let’s dive in.
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A booster pump is a type of centrifugal pump that’s used to increase the pressure or flow rate of a fluid, like oil or natural gas, in a pipeline or other fluid system. These pumps are strategically placed throughout an oil and gas operation to provide an extra boost of power when and where it’s needed most.
Without booster pumps, many oil and gas facilities would struggle with pressure drops, cavitation, and other issues that can disrupt production and efficiency. By adding booster pumps to the mix, you can overcome these challenges and keep your operations running smoothly.
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There are several key benefits that make these industrial pump systems an invaluable asset for oil and gas companies:
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Several features collectively ensure that booster pumps in the oil and gas industry are reliable, efficient, and capable of handling the demanding conditions of fluid transport and processing.
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Booster pumps designed for the oil and gas industry can handle very high pressures, which is essential for pushing fluids over long distances or through high-resistance pipelines.
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5. Corrosion Resistance
Given the nature of the fluids transported in oil and gas operations, pumps often feature corrosion-resistant coatings or materials to extend their lifespan and maintain performance.
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For applications requiring very high pressures, multi-stage pumps utilize multiple impellers to increase pressure incrementally. This design helps achieve the necessary pressure levels for long-distance transportation.
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Integrated safety features, such as pressure relief valves and temperature sensors, help prevent damage to the pump and ensure safe operation under varying conditions.
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When it comes to selecting booster pumps for your oil and gas application, it’s important to work with a trusted pump manufacturer and supplier like PumpWorks. We have extensive experience designing and delivering high-performance booster pump solutions for a wide range of oil and gas projects.
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