Privacy Policy

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This privacy policy sets out how we uses and protects any information that you give us when you use this website.

We are committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement.

We may change this policy from time to time by updating this page. You should check this page from time to time to ensure that you are happy with any changes.

What we collect

We may collect the following information:

• name and job title
• contact information including email address
• demographic information such as postcode, preferences and interests
• other information relevant to customer surveys and/or offers

What we do with the information we gather

We require this information to understand your needs and provide you with a better service, and in particular for the following reasons:

• Internal record keeping.
• We may use the information to improve our products and services.
• We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided.

Security

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.

How we use cookies

A cookie is a small file which asks permission to be placed on your computer's hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.

We use traffic log cookies to identify which pages are being used. This helps us analyse data about webpage traffic and improve our website in order to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system.
Overall, cookies help us provide you with a better website by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.
You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.

Links to other websites

Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.

Controlling your personal information

You may choose to restrict the collection or use of your personal information in the following ways:

• whenever you are asked to fill in a form on the website, look for the box that you can click to indicate that you do not want the information to be used by anybody for direct marketing purposes
• if you have previously agreed to us using your personal information for direct marketing purposes, you may change your mind at any time by writing to or emailing us.

We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so. We may use your personal information to send you promotional information about third parties which we think you may find interesting if you tell us that you wish this to happen.

If you believe that any information we are holding on you is incorrect or incomplete, please write to or email us as soon as possible at the above address. We will promptly correct any information found to be incorrect.

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How To Size And Select a Filter or Strainer

Figure 1: Y strainer

Choosing the right filter ensures optimal performance and longevity while meeting the specific filtration requirements. Choosing the right filter or strainer involves considering factors such as flow rate, particle retention requirements, pressure drop limitations, and compatibility with the filtered fluid. This article serves as a guide on choosing a filter for an application based on these factors.

Table of contents

What is a filter?

A filter removes unwanted particles or impurities from a fluid. It allows the fluid to pass through while capturing and retaining undesirable particles. Filters are commonly used in diverse systems like air conditioning units, water treatment plants, automotive engines, and industrial machinery to maintain the quality and efficiency of processes.

How to select a filter

This section discusses the important considerations and criteria for choosing the optimal filter for an application.

1) Filter (strainer) type

Y strainers and t strainers are typically used for inline applications with horizontal flow directions. Y-strainers have an inlet and outlet in opposite directions, while T-strainers have a perpendicular outlet with respect to the inlet. Suction strainers are specifically designed for applications where the flow is drawn from a reservoir or tank, typically in a vertical direction. Read our types of pipeline strainers article for more information.

2) Particle characteristics and size

Microns and mesh measure a filter screen.

• Micron rating: The micron rating indicates the size of particles the filter can effectively capture and retain. A filter with a micron rating of 10 µm can capture and retain particles that are 10 microns or larger in size.
• Mesh size: Mesh sizing refers to the number of openings per linear inch in a woven mesh screen. It represents the fineness or coarseness of the screen and indirectly indicates the particle size that can pass through the openings. The higher the mesh number, the finer the screen and the smaller the particles it can retain. A filter with a mesh size of 200 has 200 openings per linear inch. Smaller particles that can pass through the openings of a 200 mesh screen would be retained by a finer mesh screen, such as a 400 mesh screen, which has twice as many openings per linear inch.

Knowing the characteristics of the particle to be filtered helps to choose the appropriate micron/mesh size for the filter. For example, water may contain inorganic materials like sand, while ponds can contain more organic matter like leaves and algae. Inorganic elements require a smaller screen to trap the sand that would otherwise flow through a filter with a larger micron rating.

3) Connection size and type

To select a filter with the proper connection size, identify and match the existing system's connection size when choosing a filter. Also, ensure the connection type matches the system it connects to.

4) Material

The filter and seal material should be compatible with the filtered fluid. The seal ensures no leaks or bypass paths between the filter and the system. Read our chemical compatibility chart for more details on the compatibility of different materials with various media.

5) Maximum operating flow

The maximum operating flow of the system determines the filter size required. For instance, for a 100 GPM (gallons per minute) system, a 2" filter that permits 70 GPM will not be suitable. In such cases, select a bigger filter to accommodate a larger flow.

6) Operating pressure

Measuring the maximum pressure accurately is important as every filter is certified for a specific maximum operating pressure. Additionally, when using an autonomous, self-cleaning filter, the minimum operating pressure becomes vital to ensure the proper functioning of the flushing mechanism.

7) Pressure drop

Pressure drop is the decline in fluid pressure when it passes through a filter. Factors such as the impurities present in the medium, viscosity, and flow rate affect the pressure drop. Pressure drop increases as the strainer fills with filtered particles. Excessive pressure needed to address this situation can affect the filter's flow.

8) Operating costs

Consider the operating costs when selecting a filter. Self-cleaning filters have a higher initial investment than manual filters, and strainers can offer long-term cost savings. They reduce labor and downtime associated with filter replacement. Consider factors like the expenses for trash disposal.

9) Risk to the operator and the environment

Certain filters can handle highly poisonous media, while others cannot. Always assess whether the operator and environmental exposure to the medium is appropriate and take necessary precautions.

FAQ

How do I size a filter?

Consider flow rate, pressure drop, and particle retention to determine filter size. Calculate the required surface area or select appropriate dimensions for optimal filtration.

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