4NHTA-F18 Duplex Pump is Special Made for SoCal Sewer Lift Station Project.
Cornell produces thousands of pumps per year—and many have special features or design components. Cornell is happy to supply our distributors and customers these custom built solutions—it’s part of our customer service philosophy.
A Southern California distributor had just such a special request. They required a horizontal duplex-tandem pump with 4“ piping for a sewer lift station on the coast. The centerline single volutes, suction covers, backplates, and impellers all had to be ductile iron to deal with high pressures and abrasive waste water. The installation also required a specified inverter duty to allow the motor to run at different speeds and a double extended steel shaft.
The 4NHTA-F18 duplex pump was powered by 75 Horsepower motor.
The total pump weighed more than 2,400 lbs—quite heavy for a 4 inch pump, and required a specially designed and built skid to support it.
Custom work like these is a forte of Cornell Pump Company. We can use our experience in other installations to find unique solutions—as well as provided tried and true standard products from 1.25” to 30” discharges.
The winters can be brutal in British Columbia, especially at 7000 feet up a mountain. A BC-based coal company had a problem with dewatering, and needed Canada Pump and Power to provide powerful pumps—QUICKLY!
Even with the remote location 746 miles (1,200 Kilometers) from BC’s main coastal cities, Canada Pump and Power was able to rush pumps to the mine location and begin pumping 7.39 million gallons per day (33,600 cubic meters of water per day) within 36 hours of receiving the emergency call for pumps.
The distributor laid over 7,000 feet of Bauer pipeline by hand to transport the liquid away from the mine site to a holding area. Two Cornell 6NHTA pumps working in tandem were able to address the issue of flooding.
The 6NHTA has up to 300’ (91m) of head, and pumps up to 3,130 gallons per minute (11,860 liters per minute), has a 8” suction and 6” discharge, features a two vane enclosed impeller, handles solids up to 3” (9cm) in diameter. Canada Pump and Power built the 6NHTA onto a high performance trailer package, which runs at 2,000 RPM with a Cat C4.4 continuous electronic engine operating at 142 HP. Once they had received the emergency call, the distributor transferred the pumps from an Alberta staging yard to the site.
Cornell is able to address pumping needs from the bitterly cold northern British Columbia to tropical sub-Saharan Africa because of our quality pumps melded with great distributors like Canada Pump and Power.
30NNT-VF30 Pump helps California City with Waste Water
A city in northern California wanted to install a brand new reclamation system to be in compliance with state requirements. Building a new facility, rather than simply adding a pump into an existing system allowed them to consider numerous manufacturers.
Cornell competed against three other well-known manufacturers. When the design engineer firm looked at performance, with the pump designed to flow at 24,300 GPM at 38 ft of TDH, the Cornell 30NNt-VF30 came out on top.
Paired with 30NNT-VF30 was a vertical Johnson Power line-shafting, a De’Ran right angle gear drive, horizontal Johnson Power line shafting, and a Cummins 360 HP diesel engine. Cornell also supplied a Murcal control system, Tramont double-walled fuel day tank, battery racks, batteries, chargers, and components for the stainless steel exhaust system.
The system was put through extensive review in Cornell’s test lab, as well as undergoing a rotor dynamic analysis of the entire drive train, anchor bolt, and seismic design calculations, and field vibration tests.
All work went off without a hitch, and the system has operated successfully for more than two years.
Saves Money on Energy and Maintenance Expenses:
A Gulf Coast based pump supplier of Cornell, one of the leading suppliers to the shale fracturing industry, had a customer that faced piping hydraulic fracturing water transfer with multiple pumps. New Cornell pumps helped pump more efficiently with lower fuel costs.
The company operated six miles of twin 8” pipeline with 100’ of positive elevation change over the length of the pipeline. To supply the water, the company needed to pump 100 barrels of water per minute (4200 GPM) through the pipeline.
The water transfer company had nine 6NHTB’s on site to do the job. Three of the 6NHTB’s were sitting at the water source as the supply pumps. Spaced along the twin 8” pipelines were six more 6NHTB’s at various intervals to boost the pressure. This required significantly more labor to initially set, maintain and monitor nine pumps than the solution pumps.
After Cornell and the dealer analyzed the specifications for the system, a option was recommend that cut the number of pumps needed to three. The solution was to place an 8NHTH at the water as a supply pump and to place one 6822MX on each 8” pipeline as booster pumps. Not only did this cut the number of pumps by two thirds, but it also drastically reduced diesel fuel consumption on the project.
The 6822MX is part of Cornell’s high head “MX” line of mining pumps that was first introduced 2010. The “MX” line of pumps boasts industry-leading performance with flows up to 8,000 GPM and heads up to 800’ TDH. They are available in 2” to 8” discharge charge sizes and include ductile iron castings with CA6NM impellers.
While the 8NHTH is not a new pump for Cornell, it is relatively new to the oilfields. It is a 10X8 pump that boasts a maximum 20.50” impeller with a max flow of 8400 GPM and a shutoff head of 460’. This impressively solid pump has wide flow range with excellent efficiencies.
Since being introduced into the oilfields by the supplier in 2011, the “MX” pumps and the 8NHTH have substantially changed the way many of these difficult projects are approached. It is no longer necessary to stack large numbers of pumps to do long pipe runs or drastic elevation changes. These pumps have become staples of many oilfield companies’ product offerings.
The Problem: Three (3) Cornell Model 6NHTB’s had been installed and working
at the site since 2007. The original operating conditions were 1800 gpm @ 97 feet TDH for each pump, at 1200 rpm. The station had been experiencing flow interrupting blockages 1 – 2 times per week, caused by excessive amounts of non-digestible, uncommuted solids in the collection system. Each blockage required extra labor to clean the pumps and reductions in flow resulting in extended run times. Of the three pumps installed, the third pump in the trench-type wet well was experiencing virtually all of the solids handing problems.
The Solution: Cornell Pump Company installed a Cutter modification to the 6NHTB in Pump #3. The modification was done in the field and involved the installation of a new impeller with rotating cutter ring, stationary cutter assembly, and modified suction cover. The entire conversion took less than 6 hours.
End Results: Since the installation of the Cutter components, not a single service interruption or pump clean out episode has been reported. Additionally, the modification was done without a change in motor HP and a minimal impact on pump efficiency. The Cutter modification allows the use of the original, enclosed impeller design, allowing the site to continue operating as designed.
Flooding destroying lives and disrupting businesses. Monsoon flooding of Thailand began in July 2011, and continued for months—pushing southward from the highlands to the capital. More than 500 people died and the lives of 2 million more were disrupted.
A pump distributor in Bangkok was preparing a Cornell 14NHG-RP-F18DB pump for a customer when the worst of the flooding hit the capital city. The distributor’s warehouse and production facility were filling with water as they raced to complete fabrication of the pump system for the client.
The pump was delivered to the client on October 20, 2011. They immediately lent the Cornell 14NHG-RP-F18DB, complete with an ABB 150 Horsepower 6P engine, as well as another submersible pump, to the Thai government to help dewater one of the worst flooded districts, Samutsakorn.
The pumps were set up by the distributor and were in place for more than two weeks. During that time, millions of gallons of water where removed from the flooded district. The distributor and the customer were happy to help provide the pump, the Thai government appreciated the technical assistance and expertise, and Cornell Pump was pleased that one of our pumps once again took an import role in alleviating a crisis.
Without the Cornell Pump and the graciousness of the customer in lending it out, it is expect that flooding would have been much worse—with a commensurately higher loss of life and property.
The Problem: Previous installation of vertical line shaft and dry pit pump design. The station was becoming increasingly expensive to maintain and operate. Adding to maintenance issues were the pump station’s age and location—it had been operating for more than 30 years within a floodplain. The station was flooding several times a year, requiring costly repairs and loss of use of the station
The Solution: In 2010 the county commissioner approved a replacement project of the old station. Design specifications called for the new pump station to handle a peak flow capacity of 60 MGD; in order to reduce or eliminate station flooding, improve efficiency, and assure reliable operation.
To meet those objectives, design architects determined the need for minimum of 30” suction and 24” discharge, that motor horsepower could not exceed 350HP, that the station be equipped with a variable frequency drive system, and that the system have the ability to function should the new station flood. The pump selected needed to have a capacity of 20 MGD at approximately 75 feet Total Dynamic Head (TDH).
Submersible type, non-clog sewage pumps were evaluated versus vertical non-clog sewage pumps with immersible motors. The Cornell immersible design of four (4) Cornell Immersible Pumps, model 20NHF-VC20, operating at 720 RPM, 350 Hp, with Continental Immersible Motors offered premium efficiency when compared with pump systems from other manufacturers.
End Results: The four (4) Cornell 20NHF-VC20 pumps with Continental Immersible Motors have been operating since late 2010. The station was put to the test in the first couple months of operation—heavy spring rains forced the station to maximum capacity. It performed above design standards, reaching and maintaining 76 MGD—26 percent above design requirements.
Saves more than $30,000 annually through new installation efficiency and productive increases
A large California construction company boasting more than 5000 employees had a seepage problem. As one of the top ten producers of both aggregate and sand/gravel products, the company wanted to extract aggregate from around a gravel pit that frequently filled with water, in large part because the pit sits atop an underground river.
To combat the water, the company had installed another manufacturer’s pump on barges to dewater the pit and transfer the water out of the area. However, these vertical pumps were not performing to expectations. More water than was acceptable was filling the pit—making extraction less effective, and therefore more expensive. The problem was exacerbated when the company dug for new material; they got closer to the underground river and increased the seepage rate.
The area Cornell distributor had a solution: barge-mount several pumps at 45 degree angles to maintain efficiencies and minimize suction lift. The barges and a four foot by three foot strainer basket with a solid steel top to prevent vortex were designed in concert with Cornell Pump engineering. The pumps also had to be more efficient, given the high cost of electricity in this area of California.
Two Cornell 12NHTB-F18DB pumps utilizing grease lubed bearing frames drive the new design. Cornell NHTB pumps were chosen because of their superior solids handling characteristics. Through the increased efficiencies of the pumps, the aggregate company saves more than $10,000 per pump annually, plus additional tens of thousands of dollars per year in increase production from not extracting materials under higher water conditions.
Canadian Mining and Power Operator Utilizes Hydraulic Submersible Pumps in Unique Applications
Cornell’s Hydraulic Submersible 6NNT Pumps Put to the Test—and Deliver!
Abrasive slurry, temperature swings of more than 100 degrees Fahrenheit, remote locations…any of these things would test a pump system. A Canadian mining and power company faced all three obstacles to transfer solids out of waste ponds.
In one application, the company created a Hydraulic Tiller Dredge utilizing a Cornell hydraulic submersible 6NNT pump married with a CAT engine to remove bitumen from a retention pond. The pump package sits atop a six-foot long Caterpillar Landscape tiller. The tiller is lowered to the bottom of the pond and feeds constant slurry into the pump. The highly abrasive slurry is 50 percent harsh bitumen solids by weight, coursing through the pump at 2,000 gallons per minute.
The same company found another inventive use for a Cornell 6NNT and a Caterpillar tiller in a similarly challenging application. In order to pump sludge out of ponds, the package the company created had to be able to rapidly change locations, change pump depths, and tackle thick particulates. They ingeniously placed the hydraulic submersible pump on the end of a John Deere 410 excavator, replacing the Deere’s bucket with the pump and tiller. The excavator’s hydraulic system powers the pump. The pump is submerged in the sludge, and then the excavator boom moves the pump around like an egg beater to dredge out the pond.
Cornell pumps durability, reliability, and easy maintenance are keys to operating in the tough conditions and challenging environment. Cornell offers 10 versions of our submersible pump from three inch to 12 inch sizes.
In 2011 a local mining operation in the Pacific Northwest approached a Cornell Distributor for a solution to recurring pump failure/maintenance issues. The mine had been using a leading manufacturer’s self-priming trash pump to move light slurry, with a specific gravity of 1.1, from a collection area to a silt clarifier.
With a design flow requirement of 1100 GPM @ 75’ TDH (which included a 12’ suction lift), the existing pump chosen was running 1500+ RPM (belt driven) requiring a 50-HP motor when the consistency reached the optimum 1.1 specific gravity.
Originally, the pump wouldn’t run longer than 45 days before failure, so it had been converted to the manufacturer’s suggested wear resistant material. Even with this change, the mine might expect only 120 days of operation before the pump was completely worn out.
Inefficient operation, continuous belt maintenance, and priming related issues, in addition to continuing pump failures, led them to spend nearly $35,000 annually on this one system alone.
The Cornell REDI-PRIME® 6NHTA offered them the opportunity to install a guaranteed priming system that would pass the solids and slurry independent of the pump operation (no continuous recirculation through the volute), run at a speed 20 percent lower than the existing pump, be direct driven (no belts required) and increase the pump efficiency from 58 to 75 percent, thereby greatly reducing the power consumption.
The REDI-PRIME® pump recently surpassed the one year anniversary of commissioning date and so far the pump has not been pulled from service or required any maintenance attention since installation.
Testing indicates the pump is still operating at optimum efficiency. The deferred maintenance costs have more than paid for the project installations costs and the estimated power savings of 6.7kw/hr is producing another $3,500.00 in annual savings.