Five Things to Know Before Buying a Pump

As a pump supplier with over 45 years of industry experience, we understand that customers often have questions and uncertainties when it comes to purchasing a pump. In order t o help you make an informed decision, we've broken down the key information you need to know into five categories: fluid, flow, discharge, suction, and options. Our blog will provide you with a set of questions to consider, as well as helpful links to expand your knowledge on these topics.

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• What is the 

  specific gravity

   

  and

   

  viscosity

   

  of your fluid?

• Are chemicals present? What are the names and concentrations?
• Are there solids? What is the particle size, percentage of fluid that are solids, & are they smooth or sharp?
• What is its temperature? (Ambient is 20°C)

Flow - The rate you want to transfer the fluid at.

• Are you decanting, dosing or transferring?
• Are chemicals present? What are the names and concentrations?

• What will the vertical and horizontal lengths be?

• Have you taken 

  friction loss

   

  into account? (Pipe type,

   

  viscosity

  , etc. affect this)

• Are you dosing or transferring into a pressured pipe, if so what is the pressure? Or is it 

  open free flow

  ?

Suction &#; The line from source to pump.

• What&#;s the length of the suction line?

• ?

  Will you need a self-priming pump

• Are you pumping from a dam/well or is it flooded suction

Options &#; Preferences and accessories.

• Identify your preferred power source and check stability (240v, 415v, 50/60 Hz, mining/industrial, diesel, petrol, air, etc.)

• Check to see if you&#;ll require

   

  base plates

  , trollies for transportation,

   

  variable speed

  , etc.

  
  

Base plate: The plate on which the pump and motor are mounted.

Decanting: Gradually pumping from one container into another.

Dosing: A controlled method of pumping in order to discharge exact amount of fluids.

Contact us to discuss your requirements of mission pump parts. Our experienced sales team can help you identify the options that best suit your needs.

Flooded suction: If the pump is below the liquid source, and the suction is fed by gravity. This is a preferred method for centrifugal pumps.

Fluid: A state of material that continually deforms under an applied shear stress. Gas, liquid and plasma are examples.

Friction loss (pump): Friction between the pump and the process fluid results in loss of pressure. Different parts of the pump are more susceptible to this force than others.

Friction loss (pipe): The force produced as the process fluid flows through the pipes of a system. Caused by movement of the fluid internally as one fluid layer moves against another. Also caused by movement of the fluid against the pipe wall. Rougher pipes will lead to higher friction.

Open free flow: When the discharge pipe or hose is fully open at the end with no restrictions.

Self-priming pump: A pump that contains a reserve amount of process fluid that helps to create an initial vacuum and lift fluid from the source.

Specific Gravity (SG): The ratio of the density of a substance compared to the density of a reference (usually water at 4°C).

Suction line: The suction line of a pump system is piping which transports fluid material from its source to the pump itself.

Transferring: To move a substance, usually a liquid, from one place to another.

Variable speed motor: Can be used to control flow in the system by varying the impeller speed.

Viscosity: Resistance to gradual deformation of a fluid by shear or tensile stress.

The soft wash industry provides cleaning services for the exteriors of residential and commercial properties. Examples include cleaning stains off concrete driveways or removing mold, moss, and mildew from siding, roofs, and fences. To do so effectively and safely requires the right soft wash pump. 

What is a Soft Wash Pump System?

Regular high-pressure washing systems rely heavily on mechanical removal of stains and can damage surfaces or cause moisture penetration under siding or shingles. A soft wash system uses a gentler application in combination with chemicals to remove stains and debris and minimize the potential for damage. 

Soft wash chemical examples include: 

• Bleach (sodium hypochlorite)
• Algaecides
• Surfactants
• Water

Engineers and equipment designers often struggle to find a pump that stands up to harsh chemicals and produces enough flow and pressure to reach surfaces. Here, we&#;ll cover five important features to look for in a soft wash system to help your business succeed in this competitive marketplace.

1. Proper GPM & PSI

Gallons-per-minute (GPM) and pressure-per-square-inch (PSI) ratings are critical aspects of soft wash or pressure washer systems. Without the right combination of both, a sprayer won&#;t have enough vertical and horizontal throw to reach surfaces, which is especially important when cleaning a two- or three-story home. While some pump sprayers can spray that high, they often don&#;t provide proper coverage at those distances.

Producing enough flow and pressure to evenly reach from ground to eave, without getting on a ladder, is also an important safety factor. Contrary to popular belief, simply increasing the pressure won't get the desired results; having proper flow is what&#;s needed. 

The recommended flow and pressure for a soft wash system is about 6.5 GPM at 150 PSI. Paired with the right nozzle, this combination will produce a vertical throw of around 35 feet. If you cut the flow in half to 3 GPM, you&#;d only get half the vertical throw.

VIEW PUMPTEC SOFT WASH PUMP RECOMMENDATIONS

2. Quiet Operation & Sustainability

Many residential neighborhoods have noise ordinances with a maximum decibel threshold during certain times of the day. Most gas-powered engines that run soft wash sprayers exceed those thresholds. An ordinance might restrict loud noises &#;before 10 a.m. In this scenario, operators might sit idle for a couple of hours, resulting in lost productivity and revenue.

Using battery-powered electric pumps versus gas-powered engines results in whisper-quiet operation. If noise levels and minimizing disruption to area businesses and residents are a concern, use a 12V electric plunger pump system. It can recharge in between jobs without missing a beat and rivals the performance of gas-powered systems.

Another advantage of electric pumps is their ability to comply with legislation restricting gas-powered engines. Sustainability initiatives are gaining momentum across the country, and soft wash system manufacturers and operators will likely need to transition to electric eventually.

RELATED GUIDE: How to Convert from Gas to Electric Pump Systems

3. Chemical Compatibility

The most common chemical used in the soft wash industry is commercial-grade sodium hydrochlorite, a form of bleach. Technicians will use concentrations ranging from 1% for side walks up to 12% for mold and mildew on roofs. Cleaning chemicals are highly corrosive and can easily damage diaphragm pumps made with aluminum or stainless steel components. 

Ideally, pumps should be engineered primarily out of PVC, which has an A-rating for soft wash chemical compatibility. In addition to PVC pump housings, engineers also need to examine other components. For example, we recommend Viton seals vs. Buna, as well as ceramic plungers. Furthermore, valve bodies should be made of Alloy C-276, a highly corrosion-resistant metal alloy. 

RECOMMENDED SOFT WASH PUMP: Pumptec X-PVC Series

4. Pump Longevity

Unfortunately, because of poor chemical compatibility, it&#;s not uncommon for soft wash spray operators to replace their pumps multiple times throughout the year. In some businesses, cheaper diaphragm pumps are practically treated as disposable because they&#;re so unreliable, placing a strain on soft wash operations and the environment. 

Sodium hypochlorite-compatible pumps will last significantly longer than traditional diaphragm pumps. The flexible components of diaphragm pumps can easily rupture under high pressure, and they don&#;t maintain consistent pressure and flow. 

Chemically compatible pumps translate to reduced downtime and labor, and minimize the need for repairs. Another way to extend the life of a soft wash pump is to use proper accessories, like unloader valves. Unloader valves help reduce heat and pressure buildup by activating a bypass mode when the pump runs without pulling the spray gun trigger. 

5. Soft Wash Pump Cost

Directly tied to longevity is the cost of soft wash pumps. However, a value comparison is a better way to approach the topic. You&#;ll likely spend more for an A-rated soft wash pump, but the savings over the long term will far outweigh the cost difference. If a chemically compatible pump costs four times as much but lasts 10 times longer, there is significant cost savings potential.

With better performance and fewer breakdowns, operators can get in and out of jobs faster and won&#;t need to spend time making repairs. Employees can spend time on more critical functions that bring in revenue. Likewise, a better performing pump will result in happier customers, leading to more repeat business and referrals. Another consideration is the risk to employees and potential workers&#; compensation claims that might result from climbing onto ladders and rooftops. 

When considering a soft wash pump solution, it&#;s critical to factor in its total cost of ownership. Here at Pumptec, we&#;ve engineered a powerful and reliable electric soft wash plunger pump, the only A-rated system of its kind in the marketplace. Our X-PVC pump is made of highly resistant materials and engineered to be durable and long-lasting. We&#;re also developing an innovative unloader accessory that helps further enhance performance and increase longevity. Ask us about it!

Our soft wash systems address the challenges of the industry head on. Reach out to our pump experts to talk through your specific challenges and how our custom X-series soft wash pump can overcome them. Also, check out our case study below to see how one company experienced significant success.

For more froth pumpinformation, please contact us. We will provide professional answers.