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Be Safe. Be Clean. With SANDPIPER’S Innovative Signature Series Pumps

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The SANDPIPER Signature Series of AODD pumps are engineered to provide industry leading durability and performance—even in the most severe applications and environments.

 

Not all pumps are created equally. The SANDPIPER Signature Series, offered by Warren Rupp, Inc., is in keeping with the company’s commitment of the past 50 years to build “new and different” pumps. These innovative, air-operated double diaphragm (AODD) pumps come in a variety of sizes, types, and models to meet a wide array of industrial applications. The series includes:

  • Heavy Duty Flap Valve Pumps 
  • Heavy Duty Ball Valve Pumps
  • Containment Duty Ball Valve Pumps

This article focuses specifically on the Containment Duty type pumps, which enable safe movement of harsh materials for heavy industrial applications that involve chemical, abrasive, slurry, solid-laden, caustic, acidic, toxic, and combustible product.

Fluid containment

We live in a time of growing environmental and safety concerns, strict regulatory controls, as well as cost consciousness. Industrial pumps, in particular, represent potential hazards with respect to dangerous leaks that can cause harm and unnecessary expense. Whether pumping toxic or non-toxic fluids, the goal is to prevent any escape into the environment. Not only does such an incident require significant clean-up time and effort, it also incurs costs of downtime, lost production, manpower, equipment replacement, disposal fees, and often excessive fines.

 

The rugged construction of Warren Rupp’s Containment Duty Ball Valve Pumps provides superior fluid flow with specially designed containment features to protect people, the environment, and the pump, itself. Based on the premise that two diaphragms are better than one, this pump is built with an intentional space between its dual diaphragms (a pumping diaphragm and a driver diaphragm), creating a barrier between the Air Side and Wet Side of the pump. Thus, fluid is prevented from escaping to the environment should the pumping diaphragm become breached. It also provides visual leak detection alerts to inform users when there is a diaphragm breach before any of the system fluid can escape (also available with electronic and mechanical leak detectors).

 

The biggest benefit of the Containment Duty pump over traditional AODD pumps is the ease of repair, since the Air Side of the pump does not get contaminated. And the design allows quick and easy access to the main air valve components—without removing it from service. The result is minimal maintenance cost and downtime.

 

Additional pumping options

The other types of SANDPIPER Signature Series pumps also provide powerful AODD capabilities that outperform the competition, as follows:

  • Heavy Duty Flap Valve Pump —  designed to handle fluids containing large, up-to-line size solids (for example: rocks, twigs, leaves; nuts, bolts screws; and rags)
  • Heavy Duty Ball Valve Pump — designed to handle fluids containing settling, suspended or floating solids, and abrasives (for example: sand, slurries, pea gravel, etc.)

 

To learn more…

Signature Series pump specifications, performance data, and brochures can be viewed at www.sandpiperpump.com/signature-series.

 

All SANDPIPER products are sold worldwide through a network of independent, factory-authorized distributors. For information on the full product portfolio, contact a local representative via www.sandpiperpump.com/distributors.

 

 

Journal article: SANDPIPER Signature Series/Containment Duty Pump
Draft 2, August 21, 2017
Deborah Long

 

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Pumps

Glasgow’s new screw pumps secure long-term sewage treatment

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ECS Engineering Services has recently commenced works as part of the latest phase of Scottish Water’s £250m city-wide programme to improve sewage management in the Glasgow area. Over the next eight months ECS, in association with Landustrie, will be installing and commissioning 14 new screw pumps at the Shieldhall water treatment works, which serves most of the centre of the city.

Shieldhall is the largest of the Glasgow area’s waste water treatment works and serves a population of about 600,000 in the south of Glasgow, Newton Mearns and Renfrew areas.

The Shieldhall site has been modernised several times over the years to meet the growing demand of an ever-expanding population in Scotland’s largest city. As part of the current programme it was realised that the 14 large Archimedes screw pumps that drive the process were getting towards the end of their service lives and needed replacing.

There are four low level and six high level screw pumps, each weighing 13 tonnes, being 16m long and 2.4m in diameter and capable of pumping 960 litres/sec. There are also four larger RAS (return activated sludge) pumps, each 16m by 2.6m with a flow capacity of 1580 litres/sec.

The recent contract award was to provide like-for-like pump replacements, but ECS realised that this would have meant service engineers working in the original concrete troughs, hand screeding the screw pumps for several weeks to create the formed pumping troughs. This process exposes the engineers to unnecessary risks, so in conjunction with Landustrie in the Netherlands the design team looked closely at the design of the equipment to eliminate as much of this as possible, whilst ensuring the client still received the best standard of equipment currently available on the market.

In conjunction with ESD, Scottish Water’s supply partner, several design upgrades were made, the most significant being the alleviation of the requirement to hand screed the new machines into the concrete trough. The pumps were assembled in the factory complete with the new steel coated troughs, these can be moved into position relatively easily, without the fitters having to work in confined and potentially dangerous spaces. Upon successful installation of the new pump and troughs the whole machine will be backfilled with concrete giving both strength and durability far better than the original installations for many years to come. This design upgrade was a major health and safety gain that both Scottish Water, its main contractor ESD and ECS were keen to embrace.

Scottish Water specifications stated that a v-belt drive system should be used, with a direct-on-line drive configuration. This simple but efficient arrangement is appropriate because the slowly rotating pumps run continuously so there are no regular start-up impulses or shock loadings. To compliment this further, ECS has installed new high efficiency motors, which over the course of their long working life will save a considerable amount of energy.

ECS has also delivered further long-term savings thanks to the installation of Landustrie stainless steel ECO, sealed-for-life bottom bearings that are maintenance free for the lifetime of the bearing. Together, the complete installation will provide long-term reliability and efficiency for the treatment works for many years to come.

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Pumps

Key questions for selecting a wastewater solids handling pump

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If the liquid you’re pumping contains solids, there are a number of solids handling submersible pumps that might be appropriate for your application. To avoid clogs or burning your motor out, you need to make sure you have the right pump. There are key questions that help determine which pump will solve your problems. In this post, we’ll examine these questions so that you’re prepared when you talk with your provider.

What type of solids are you’re pumping?

Understanding the solids in your liquid helps your provider determine the right type of pump for your application. We’re focusing on wastewater, so we can assume your solids are not abrasive (abrasive solids would require a hard metal, agitator pump). Most likely, they are large and soft or long and stringy. You also need to know if the solids need to be reduced to go into your system or to discharge, or if you just need to pass them.

Large and soft solids generally need a shredder pump that will shear the materials before pumping. Long, stringy solids indicate that you’ll need a vortex pump that can pass the entire solid.

Understanding the type of wastewater is also helpful. These are generally categorized as municipal (including sewage) or industrial. While municipal wastewater is generally consistent among sites, industrial wastewater solids and contaminants often vary based on industry.

What solids loading can the pump handle?

There needs to be enough liquid either in the sump or in the system to keep solids moving with the liquid. Without enough water, the pump will clog and won’t be able to pass the solids. Most solids handling pump designs can handle approximately 5% solids by volume. If your wastewater has a higher concentration, you will likely need to add more water to the sump by changing the system to allow more water to accumulate in the sump or by adding more water to the process.

The sump pump basin size is also a factor. The basin should be sized to minimize the number of cycles per hour but cannot be so large that solids will settle instead of being brought into the pump.

How might your piping system affect the pump you need?

Understanding the design of your piping system will help your provider make sure there are no areas where the solids may settle, build up and cause clogs. This includes:

  • Size of the Piping: It must be large enough to pass solids downstream, but small enough to maintain carrying velocity to prevent solids from settling out. We recommend carrying velocity of 5-7 ft./sec. for municipal wastewater applications. As the specific gravity of the solids increases, you may need to further increase the velocity to carry the solids.
  • Vertical Lift: This is the height that water has to travel as it moves through your piping system. A significant vertical lift combined with an improperly sized pump can cause solids to recirculate and clog within the pump volute.
  • Location of Check Valves: The check valves should be as close to the pump as possible. If too far from the pump or too high, solids can build up before reaching the valve. This causes clogging as the solids backflush into the pump. Adjusting the location of the check valve generally solves these issues.

In some instances, your provider may conduct an inspection. If the entire piping system isn’t visible, you may need to show the piping system plans or explain where and how far the piping goes. The piping connections and fittings are important too.

What is the required flow rate for your system?

The flow rate is the amount of liquid that runs through the system in a given amount of time. This and the pipe sizing determine the velocity needed to pass the solids downstream through the pipes. The flow rate also indicates the appropriate size your sump should be. An undersized sump causes the pump to cycle too frequently and burn itself up.

If you don’t know your flow rate, here are two options to help your pump provider determine it:

  • Calculate the flow rate by performing a draw down test. With no water entering the sump, allow the current pump to run for as long as possible while recording the time in operation. The flow rate is the volume of liquid pumped (sump length x sump width x the change in liquid level from start to end of pumping cycle) divided by the amount of time recorded during the drawdown test.
  • If you have the model number of your current pump, researching the pump’s performance curve combined with the piping system information or a pressure gauge reading in the system can help your provider calculate the flow rate.

Translating answers to the solids handling pump you need

The answers to these questions provides the information your provider needs to make a recommendation. The natures of the wastewater and solids determine the type of pump you need (i.e. shredder or vortex pump). The flow rate (and the amount of head in the system) indicates the specific pump model you need.

In addition, you may have unique circumstances to consider, especially when dealing with harsh environments. These are the types of situations in which BJM Pumps excels. We build submersible pumps to deal with rugged applications and have 35 years of experience helping customers dealing with the issues you deal with every day. Contact us or call us at 860-399-5937 to request more information or to initiate a personalized evaluation of your submersible pump needs.

 

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Pumps

Giant screw pump to be replaced

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ECS Engineering Services is to install a replacement screw pump at Wessex Water’s Avonmouth Sewage Treatment Works (STW), helping secure the capabilities of the facility for decades to come.

Avonmouth STW serves a population of about 1,000,000 people in Bristol and the surrounding towns and villages. One of its key pieces of process plant is a very large screw pump which has been in operation for around 40 years. However, it had become badly worn and effectively reached the end of its useful service life.

ECS was asked to inspect the screw pump and make some proposals for its overhaul or replacement. Jake Laughton, the ECS engineer who led the inspection says: “Much of the pump is in a serviceable condition and can be retained, however, the screw itself has reached the end of its life and needs to be replaced.”

At 21 tonnes, 20 metres long, 3.1 metres in diameter and able to pump 3,645 litres of water a second, the screw is simply enormous. ECS has arranged to have a new screw fabricated in Holland by long-standing partner company, Landustrie. Made in mild steel, a high-performance, corrosion resistant coating will give it a working life measured in decades.

“We have incorporated some important innovations,” says Jake, “including a stainless steel lower bearing, again made by Landustrie. This does not need an oil or grease feed, so is both ecologically sound and reduces the maintenance requirements – features that will pay dividends in the long run.”

The design team has evaluated the loading on the pump when it is in use and optimised all the new parts to lengthen the pump’s working life and maximise its efficiency and reliability.

Jamie Wesley, Operations Director at ECS states, “To be involved with machines of this size showcases the excellent capabilities available here at ECS, our screw pump experts have given the existing motor, gearbox and upper bearing a clean bill of health, which has helped to reduce the overall cost of the project for Wessex Water.”

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