Duplex Strainer: Function and Operation Explained
A duplex strainer, also known as a twin basket strainer, is a filter used to remove big particles of dirt and debris from gas, oil, or water connected piping system. A duplex strainer system, in most cases, comprises two independent housings for strainer baskets. Between the two boxes, a valve handle is also included to direct liquid flow to one filter while the other is being cleaned.
The valve in some strainers operates automatically, and the strainer self-cleans.
When the flow of a pipeline cannot stop, this type of filter utilize. Depending on the size of their NB, they can filter up to 40 m. Basket strainers are employed in industries where solid contaminants predominate. Unlike other types of filters, these strainers are relatively easy to maintain.
Duplex strainers widely use in a variety of industries, including the process industry, the power industry, the chemical industry, the oil and gas industry, the pulp and paper industry, the pharmaceutical industry, the metals and mining industry, water and waste management, the fire fighting industry, refineries, and petrochemical plants. Filters employee to remove hazardous elements that could cause a partial or complete failure of operations if introduced into the system.
Table of Contents
What is the Function of a Duplex Strainer?
A Duplex filter, also known as a Basket strainer, comprises two separate strainer baskets housed together. The suspended solids are collected in a washable basket.
A valve handle place between the two baskets to prevent fluids from flowing to one filter while the other clean. Butterfly valves use to change the direction of flow.
These strainers or filters employee in situations when the fluid flow cannot stop. For example, in fuel lines, lube oil lines, and so on, engines and equipment can fail fatally if the flow interrupt.
Duplex Filter Cleaning
Filters are cleaned regularly or anytime the pressure drops. Turn the filter over to the clean side to clean it. Check to see if oil is flowing through the purge cock on the filter you’re using.
Open the purge cock on the filter if it is not already closed. Open the cover and remove the filter element when the oil has stopped pouring.
When utilizing heavy fuel oil, use caution because it will be pretty hot. The filter compose of notched wire constructed to meet ANSI specifications. The micron rate of filtering controls the size of the notched wire. Its size ranges from five to 35 microns.
Cleaning the filter element using kerosene and compressed air Replace the filter element and lid, then gently turn on and evacuate the air from the filter housing.
Duplex Strainer Model Options and Flow Rates
When selecting a duplex strainer, it’s crucial to consider the diverse model options available and their respective flow rates to ensure optimal performance for your specific application. Duplex strainers come in a variety of materials, such as stainless steel and carbon steel, granting options that cater to different environmental conditions and fluid types. Additionally, each model has unique specifications regarding size and flow capacity, typically measured in gallons per minute (GPM) or liters per minute (LPM). When assessing flow rates, it’s essential to match the strainer with the pipeline’s diameter and the anticipated flow velocity to prevent excessive pressure drop, which can lead to operational inefficiencies. For industries requiring ASTM compliance or those working with corrosive fluids, specialized duplex strainer models with enhanced features like higher micron rating or automated cleaning systems can provide significant advantages. Selecting the right model not only enhances filtration efficiency but also extends the lifespan of your equipment, ultimately leading to improved system reliability and reduced maintenance costs.
How do Self-Cleaning Filters Perform?
Self-cleaning filters use system pressure to clean themselves. The stiff cylinder screen of the filter strains particles from the water supply, retaining the material inside.
This accumulation might cause a pressure differential between the intake and the exit. When the pressure differential reaches the specified control, a flush valve opens (usually approximately 7psi). This results in a low-pressure flow, allowing the suction nozzles to suck the particles out of the filter.
Applications of Duplex Strainers
Duplex strainers find extensive applications across various industries where the need for uninterrupted fluid flow and reliable filtration is paramount. In the oil and gas sector, they play a crucial role in protecting pipeline systems from solid contaminants, ensuring operational efficiency and safety. Additionally, in the chemical manufacturing realm, duplex strainers safeguard the integrity of processes by removing particulate matter from various chemicals. Their robust design makes them ideal for use in power generation facilities, where they help maintain system reliability by filtering out debris from cooling water and steam lines. In the water treatment industry, these strainers are utilized to prevent fouling in pumps and other equipment, ensuring clean water supply. Moreover, duplex strainers are valuable in HVAC systems, where they filter out dirt and debris from circulating fluids, thus extending equipment life. The versatility and reliability of duplex strainers make them an indispensable component across a myriad of applications.
Benefits of Self-Cleaning Filters
The essential advantage of automatic self-cleaning filters is that they are low-maintenance, making them an excellent choice for NSF certified distant sites because they do not require operator input.
Another significant benefit of industrial self-cleaning filters is that they clean themselves while the system is still running. As a consequence, the user saves money, energy, and time. They also have a small design that provides for installation flexibility.
Duplex Bag Filters
Duplex bag filters are an essential component in various industrial processes where high-flow filtration is required. Designed with two separate bag filter housings, these systems allow for continuous operation while one bag is being cleaned or replaced. The easy access design ensures that maintenance can be performed quickly, minimizing downtime and ensuring that the filtration process remains uninterrupted. These filters are particularly effective in removing particulates from liquids and are commonly used in industries such as pharmaceuticals, food and beverage, and manufacturing. By utilizing either a manual or automated valve system, operators can easily switch between bags, enabling efficiency and cost-effectiveness. Furthermore, duplex bag filters can accommodate a range of bag materials and micron ratings, allowing for versatile applications that meet specific filtration needs. Their robust construction and adaptable design make them an invaluable solution for facilities looking to maintain clean processes and comply with strict quality standards.
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