Do you have questions or concerns regarding your filter press? Here are some common filter press questions and their solutions.
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Usually you will need a longer cycle time to achieve the same cake dryness. You may also notice sloppy cake or discharge flow is less.
Use a spatula to scrape cake off the surface. Cake buildup can cause bending of the press frame. Excessive bending can lead to equipment failure! Keep the cloths and plates as clean as possible, especially along the sealing surface.
Keep the following in mind when scraping cloths:
If high-pressure washing does not improve performance, carefully pull back a corner of the filter cloth and check the drainage area and discharge parts of the plate for solids buildup. If there is any buildup, the cloths must be removed, and the plates and cloth backs cleaned. Excessive buildup causes slow filtration cycles and can lead to plate breakage.
If more thorough cleaning is required, you can use a chemical process to dissolve the entrapped particulate.
A recirculation cleaning method using a particulate dissolving solution is the most effective cloth cleaning method. This method circulates an acid, caustic, or cleaning solution through the press to dissolve built up particulate. The type of solution depends on the slurry.
Be extremely careful when handling acids or caustics! Eye protection and protective clothing is required. Should you get acid or caustic in your eyes or on your skin, rinse with water immediately and seek medical attention if necessary. Notify your supervisor of the incident.
Do not acid or caustic wash non-gasketed filter plates unless extra precautions are taken to contain the leakage between plates.
Consult the chemical compatibility chart in the safety section of your O&M manual to ensure safe and proper operation of the press.
Setup & Requirements
Procedure
The plates can also be "dip washed" by immersing them in a tank of solution. The immersion method is less efficient than through-washing in the press and will require a longer soak time. The plates will also float and require some method to keep them submerged.
They could last as little as six months or as long as five years. It depends on many things:
It‘s probably time to change your cloths when you see abrasion, stretchiness, folding, holes, poor cake, dirty filtrate or when conventional cleaning techniques don‘t restore the performance of your filter press.
First, remove the used filter cloth. To remove a filter cloth from a gasketed plate, insert a thin bladed screw driver into the groove at the outer edge of the caulking and pry out a small section of the cloth. Grab the sash cord caulking with a vise grip pliers and pull the remaining cloth out of the caulking groove. Do this on both sides of the plate. Pull the cloth through the center feed eye of the plate. After the cloth is removed, inspect and remove any accumulated solids from the groove before inserting the new cloth.
To remove a filter cloth from a non-gasketed plate, use diagonal cutters or snips to cut the ties (if supplied) on the vertical sides and lift each side of the cloth off of the cloth-pins on the top edge of the plate. Pull the cloth through the center feed eye of the plate.
Installing
On both gasketed and non-gasketed plates having a center feed eye with sewn centers, you will need to fold the cloth on one side into a small section so that it can be inserted through the center feed eye. Once you pull the cloth through the eye, unfold it for caulking on the gasketed plate, or hanging on the non-gasketed plate. On gasketed plates, place the cloth against the plate and tap in a small section of the sash cord or O-ring on the top to hold the cloth in position. Line up and caulk the diagonal sections first to ensure proper alignment of the cloth. Distribute the caulking one the sides, top and bottom by caulking in the center of these long sections first. Proceed to insert the balance of the caulking, ensuring that the caulking is distributed evenly. Even though there may appear to be a surplus of material, this can be worked in easily.
The tool for installing the retaining material (O-ring caulking and sash cords) is a simple wedge of polypropylene or some other non-shattering type material. The recommended size for the tool is 1“ (25mm) thick x 3“ (75mm) wide x 8“ (200mm) long with one end tapered down to 5/16“ (8mm) thick (available from USFilter, part #). CAUTION: Do not use a metal wedge since this may damage the cord or filter cloth.
On non-gasketed, lift the cloth over the cloth dogs on top of the plate. Then join the two edges on the sides of the filter plate with wire ties or similar clips
Unlike intermediate filter cloths, the end-plate (head and tail) cloths do not have a sewn-in centerfeed eye. The endplate cloths would be installed as described in the previous question; however, the head-plate cloth must have the centerfeed hold cut before installation.
To do this, remove the old head cloth by first removing the centerfeed assembly‘s clip nut. Then, tap the corners of the new end-cloth into the head-plate making sure it is positioned correctly. Cut out the cloth around the centerfeed pipe using the equivalent of a hot knife, sottering gun or the like. This will seal the edges of the cut to prevent possible fraying of threads in the cloth. After the hole has been cut, finish installing the head cloth, then re-attach the clip nut.
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It‘s a good idea to change your gaskets whenever you change your filter cloths. Also, if you are getting excessive leakage out of the press while maintaining correct hydraulic closure pressure, this may be a sign that it is time to change your gaskets.
Gasket life will depend on many factors, such as length of filtration cycle, temperature, and excessive closing force. Gasket replacement should take place if the gasket appears to be delaminating or shredding into small particles. Also, if excessive temperatures exist and cycles are very long, the Nordel elastomer (standard gasket material) may go into additional cure, causing it to harden slightly. If the gasket life of the Nordel elastomer is unsatisfactory, contact USFilter for a suitable replacement.
Install the discharge eye gaskets in the same manner.
NOTE: When gasketed plates are first put into use, the new gasket material may be slightly sticky or gummy and cause gaskets to pull out of the grooves when plates are separated. This condition is eliminated as product film is built up. If any gaskets show this characteristic, apply a silicone spray until the press has been used several times.
If the press is leaking (around the locknut on the 470mm size or from the bottom leg drain holes on 630mm and larger size presses) during the start-up of the feed process, the problem is usually leakage past the center feed quad ring seal. The quad ring may not seal for several reasons.
First Check For The Cause
Did the locknut on the outside of the press head loosen during shipment? If so, tighten the locknut using a spanner wrench, pliers, or pipe wrench.
Was extra field piping and/or manifolding added to the center feed pipe without proper support? Unsupported loads on the center feed pipe can cause the pipe to move off axis and unload the quad seal on one side. If this is the case, properly support all external piping. Loosen the piping from the factory-supplied piping and/or valve and realign the feed pipe so that it is perpendicular to the plate surface. Tighten the locknut and reinstall the supported piping.
Was the center feed pipe rotated during the field installation of extra piping/ manifolding? This could unseat the quad seal causing leakage around the seal. No feed pipe movement will reseat it.
Follow These Steps To Fix It
Under normal conditions, you should usually change your hydraulic oil once a year, or every 2,000 operating hours. Under severe conditions, the oil will need to be changed more frequently.
Whenever you change your oil, you should change your filter.
An industrial filter press is large-scale mechanical equipment that must be installed and debugged before it can be used. They cannot be used immediately after purchase but must be installed and tested before being used. Therefore, the installation procedure of filter presses is also a question of concern for firms and enterprises.
Filter cloth in a Filter press is used to segregate liquid and solids from the slurry once it is pushed between the empty spaces of filter plates. At first, some tiny slurry particles go through the filter cloth material. The process continues until a film of dehydrated solids collects on the surface of the cloth. The collected solids then begin to filter other slurry material encapsulating all the solids and allowing only clean liquid (i.e., the filtrate) to go through the filter cloth.
Filter presses dewater and detach liquids and solids in various applications. Due to their versatile and reliable nature, filter presses are one of the most widely used systems in solid-liquid separation. They drench material and separate solids and liquids by pumping the slurry into a series of chambers formed by a press's filter plates. Each plate is connected with filter media determining what particles are dewatered and separated from the liquid.
NMP, one of the largest filter press manufacturers in India, provides diverse solutions per the customer's requirements. Our main goal is to provide the right solution for every application as an innovation expert in separating solids and liquids. We have a comprehensive range of products available to us, which is the basis of all our solutions. Our products can be tailor-made per the customer's requirements and needs. Thus, each of the products available with us ultimately becomes a distinguished NMP product – made as per the customer's needs.
In the mid 19th century in the United Kingdom, one used a rudimentary form of filter presses to extract vegetable oil from seeds. However, when in the 20th-century, major developments took place everywhere; scientists developed an automatic horizontal-type filter press. Since then, filter presses have gone through a lot of technological advancements and changes.
Industries use a filter press machine to separate solids from liquids. The pressure filtration method separates the solids from liquids by pumping a slurry into the equipment that is dehydrated under pressure. The type and the volume of the slurry that needs to be dehydrated influence the design of the filter press machine. NMP manufactures a range of filter machines to suit your capacity and application needs for more economical and trouble-free dewatering.
A filter press machine (also known as a Plate-and-Frame Filter press) illustrates the type of filters that evolved in the s. Generally, the type of filter press used today is commonly known as "Chamber filter press," "Membrane filter press," or "Membrane plate filter." Many industries, such as the food, chemical, or pharmaceutical industries, make goods from liquid-solid suspensions or slurries. Solids and liquids are separated in a Filter Press Machine so that the good part of the mixture can be processed, packaged, or delivered.
The separation of solids and liquids is done using a filter press machine. The pressure filtration process is done to divide solids/liquids. A slurry is pushed inside a filter press machine and is dehydrated when subjected to extreme pressure. Filter press machines are manufactured based on the volume and the slurry that needs to be dehydrated.
A central control panel is present in a semi auto filter press where the operator initiates every string step. All the valves of a semi auto filter press are opened and closed with the help of physical labor. A semi auto filter press is used in industries such as granites and sludge produced from galvanizing plants consisting of zinc, chromium, copper, nickel, etc.
A filter press is used to separate liquids and solids by using the pressure filtration method when put in simple words. A slurry is forced inside the filter press equipment, and water comes rushing out from it due to pressure. The method of filter press has been used since the mid-s in many industries such as wastewater, chemicals, cosmetics, industrial, pharmaceutical, metals, and mining.
Plate and Frame Filter Presses are the most basic and oldest type of Filter Press. A metal skeleton holds and locks the filter plates together to build a pressure chamber in the formation. Clamping is accomplished with either an old-fashioned wheel crank or, more recently, a hydraulic pump and cylinder (either manual or automatic). The plates are made of a variety of metals, including cast iron, aluminum, and polymers, the most popular of which is polypro. Before being filtered through the cloth, the slurry is pushed into one or more corner holes and then into each frame. The filtered clean water runs through the solid plate’s drainage system and into one or more corner holes that aren’t used for slurry feed. This clean solution makes its way to the customer’s tanks, drain, or process via discharge pipes. No more slurry can be fed into the filter press once these hollow frames are full with solids, so it’s time to open the press and knock out the solids.
The 21st century is well equipped with technologies and automation industries. The use of technologies and automation had drastically changed the scenario and performance of the next-generation filter press. The membrane filter press is the most trusted dewatering equipment. The main purpose for this treatment is wastewater applications from industries. A filter paper extracts the liquid from the solid by removing various impurities. A filter press consists of a frame, filter plates, piping and valves, and filter cloth. The filter press will make the separation with the help of technology and applications which is convenient and economical in case of dewatering.
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