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| [[Fibre-reinforced plastic|FRP]] ([[Glass-reinforced plastic|Fibreglass Reinforced Plastics]], also known as GRP, or Glass Reinforced Plastics) is a modern [[composite material]] of construction for chemical plant equipment like [[tank (disambiguation)|tank]]s{{disambiguation needed|date=November 2012}} and [[vessel (disambiguation)|vessel]]s{{disambiguation needed|date=November 2012}}. Chemical equipment that range in size from less than a metre to 20 metres <ref>{{cite web|url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VMX-4HKMRXD-11&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a7ed112a4d299759cf2bbc8f717f2238 |title=Reinforced Plastics - World's largest FRP acid storage tanks |publisher=ScienceDirect.com |date=2005-11-18 |accessdate=2013-04-22}}</ref> are fabricated using FRP as material of construction.
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| FRP Chemical Equipments are manufactured mainly by [[Glass-reinforced plastic#Fibreglass hand lay-up operation|Hand Lay-up]] and [[filament winding]] processes. [[BS4994]] still remains a key standard for this class of items.
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| ==Dual Laminate==
| | They are typically a free website that are pre-designed for enabling businesses of every size in marking the presence on the internet and allows them in showcasing the product services and range through images, contents and various other elements. Good luck on continue learning how to make a wordpress website. Step-4 Testing: It is the foremost important of your Plugin development process. After confirming the account, login with your username and password at Ad - Mob. By using this method one can see whether the theme has the potential to become popular or not and is their any scope of improvement in the theme. <br><br>purcase and download - WPZOOM Tribune wordpress Theme, find and use the WPZOOM Discount Code. But as expected the level of support you get with them can be hit or miss based on the developer's free time and desire. With the free Word - Press blog, you have the liberty to come up with your own personalized domain name. Apart from these, you are also required to give some backlinks on other sites as well. But in case you want some theme or plugin in sync with your business needs, it is advisable that you must seek some professional help. <br><br>The entrepreneurs can easily captivate their readers by using these versatile themes. As of now, Pin2Press is getting ready to hit the market. This platform can be customizedaccording to the requirements of the business. The first thing you need to do is to choose the right web hosting plan. If you've hosted your Word - Press website on a shared hosting server then it'll be easier for you to confirm the restricted access to your site files. <br><br>It is the convenient service through which professionals either improve the position or keep the ranking intact. If you have any type of inquiries pertaining to where and the best ways to use [http://registro.ibercivis.pt/view_profile.php?userid=4424270 wordpress backup], you could call us at our page. * Robust CRM to control and connect with your subscribers. Thus it is difficult to outrank any one of these because of their different usages. If you choose a blog then people will be able to post articles on your site and people will be able to make comments on your posts (unless you turn comments off). Look for experience: When you are searching for a Word - Press developer you should always look at their experience level. <br><br>Millions of individuals and organizations are now successfully using this tool throughout the world. If you operate a website that's been built on HTML then you might have to witness traffic losses because such a site isn't competent enough in grabbing the attention of potential consumers. Useful Plugins Uber - Menu Top Megamenu Now it is the time of sticky Top navbar. Change the entire appearance of you blog using themes with one click. Article Source: Hostgator discount coupons for your Wordpress site here. |
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| Due to the [[corrosion]] resistant nature of FRP, the tank can be made entirely from the composite, or a second liner can be used. In either case, the inner liner is made using different material [[properties]] than the structural portion (Hence the name dual (meaning two) and laminate (a word commonly used for a layer of a composite material))
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| The liner, if made of FRP is usually resin rich and utilizes a different type of [[fibreglass|glass]], called "C-Glass", while the structural portion uses "E-Glass". The thermoplastic liner is usually 2.3 mm thick (100 [[thou (length)|mils]]). This thermoplastic liner is not considered to contribute mechanical strength. The FRP liner is usually cured before winding or lay-up continues, by using either a [[Benzoyl peroxide|BPO]]/[[Dimethylaniline|DMA]] system, or using an [[MEKP]] catalyst with [[cobalt]] in the [[resin]].
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| If the liner is not made of FRP, there are multiple choices for a thermoplastic liner. The [[engineer]] will need to design the tank based on the chemical corrosion requirement of the equipment. [[Polypropylene|PP]], [[PVC]], [[PTFE]], [[ECTFE]], [[ETFE]], [[Fluorinated ethylene propylene|FEP]], [[CPVC]], [[PVDF]] are used as common thermoplastic liners.
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| Due to FRP's weakness to [[buckling]], but immense strength against [[tension (physics)|tensile]] forces and its resistance to corrosion, a [[hydrostatic]] [[storage tank|tank]] is a logical application for the composite. The tank is designed to withstand the hydrostatic forces required by orienting the [[fibre]]s in the tangential direction. This increases the [[hoop stress|hoop strength]], making the tanks [[anisotropic]]ally stronger than steel (pound per pound).
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| FRP which is constructed over the liner provides the structural strength requirements to withstand design conditions such as internal [[pressure]] or [[vacuum]], hydrostatic loads, [[seismic]] loads (including fluid sloshing), [[wind]] loads, regeneration hydrostatic loads, and even [[snow]] loads.
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| ==Applications==
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| FRP tanks and vessels designed as per [[BS 4994]] are widely used in the chemical industry in the following sectors: chlor-alkali manufacturers, fertilizer, wood pulp and paper, metal extraction, [[refining]], [[electroplating]], [[brine]], [[vinegar]], [[food processing]], and in air pollution control equipment, especially at [[municipal]] [[waste water treatment plants]] and [[water treatment|water treatment plants]].
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| ==Types==
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| FRP Vessels and Tanks are used in multiple applications, requiring a strong, corrosion resistant environment.
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| ===Scrubbers===
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| FRP [[Scrubber]]s are used for scrubbing [[fluids]]. In air pollution control technology, scrubbers come in three varieties, Dry Media, Wet Media, and Biological.
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| ====Dry Media====
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| Dry media typically involved a dry, solid media (such as [[activated carbon]]) suspended in the middle of the vessel on a system of [[Beam (structure)|beam]] supports and grating. The media controls the [[concentration]] of a [[pollutant]] in the incoming gas via [[adsorption]] and [[Absorption (chemistry)|absorption]].
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| These vessels have several design constraints. They must be designed for
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| *Unloading and Reloading the media
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| *Corrosive effects of the fluid to be treated
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| *Internal and External Pressure
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| *Environmental Loads
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| *Support Loads for the grating and support system
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| *Lifting and Installing the Vessel
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| *Regenerating the media inside the vessel
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| *Internal Stack supports for a dual bed construction
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| *Redundancy for preventative maintenance
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| *Demisting to remove liquids that degrade the dry media
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| *Condensate removal, to remove any liquid that [[condense]]s inside the vessel
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| ====Wet media====
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| Wet media scrubbers typically douse the polluted fluid in a scrubbing solution. These vessels must be designed to more stringent criteria. The design constraints for wet media scrubbers typically include:
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| *The corrosive effects of the polluted fluid and the scrubbing solution.
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| *The high pressures and loading of a spray system
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| *Aerodynamics of the internal media to ensure that there is no bypass
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| *Internal Support systems
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| *Reservoir of scrubbing fluid for recirculation.
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| *Internal and External Pressure
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| *Environmental Loads
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| *Lifting and Installing the vessel
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| *Plumbing of the scrubbing fluid to the vessel
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| *Draining to remove vessel sump fluids
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| In the case of a ''decarbonator'', used in [[reverse osmosis]] systems to limit the concentration of gases in the water, the air is the scrubbing fluid and the sprayed liquid is the polluted stream. As the water is sprayed out of the scrubber, the air strips the aqueous gasses out of the water, to be treated in another vessel.
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| ====Biological====
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| Biological scrubbers are structurally identical to the wet media scrubbers, but vary in their design. The vessel is designed to be larger, so the air moves slower through the vessel. The media is designed to encourage biological growth, and the water that sprays through the vessel is filled with [[nutrients]] to encourage [[bacteria]] to grow. In such scrubbers, the bacteria scrub the pollutant. Also, instead of a single, large support system (typically 10 feet depth of media for chemical scrubbers), there are multiple stages of media support, that can change the design requirements of the vessel. (See [[biofilter]] for similar technology that is usually performed outside of an FRP vessel.)
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| ====Tanks====
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| A typical storage tank made of FRP has an inlet, an outlet, a vent, an [[manway|access port]], a drain, and an overflow nozzle. However, there are other features that can be included in the tank. [[Ladders]] on the outside allow for easy access to the roof for loading. The vessel must be designed to withstand the load of someone standing on these ladders, and even withstand a person standing on the roof. Sloped bottoms allow for easier draining. [[Level measurement|Level gauges]] allow someone to accurately read the liquid level in the tank. The vessel must be resistant to the corrosive nature of the fluid it contains. Typically, these vessels have a secondary containment structure, in case the vessel bursts.
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| ===Size===
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| The size of FRP Vessels is rarely limited by [[manufacturing]] technology, but rather by [[economics]]. Tanks smaller than 7,500 [[liter]]s (2,000 [[gallons]]) are easily manufactured out of cheaper materials, such as [[HDPE]] or PVC. Tanks larger than four meters are generally limited by [[shipping]] constraints, and the economics suggest a [[concrete]] or [[steel]] tank fabricated at the tank's [[wiktionary:location|location]].
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| For [[chemical]] storage and [[air pollution control]], the choice is to make multiple tanks of smaller [[diameters]]. For example, one of the largest odor control projects in [[California]], the [[Orange County, CA|Orange County]] Sanitation District will utilize 24<ref>[http://www.cdm.com/NR/rdonlyres/BEDCE6CF-A0A6-4911-9FEA-952BF972BEF5/0/TheOrangeCountySanitationDistrictGoesforHighRateBiotowersinaBigWay.pdf] Page 12, Plant 2 Headworks Facility</ref> vessels total to treat 188,300 [[Cubic feet per minute|cfm]] (86,200 L/s) of odorous air, with a design of up to 50 [[parts per million|ppm]] of [[hydrogen sulfide]].<ref>[[Carollo Engineers]], Orange County Sanitation District Plant No. 2 Headworks Replacement (Job No. P2-66) Specification 11395D.1.3.A.3</ref> For an equivalent single vessel to perform as well as the 13 headworks [[trickling filter]]s, the single vessel would have to be over 36 feet in diameter.<ref>Since area must be maintained to keep velocity reduced, <math>{\sqrt{13*{{\pi}\over{4}}*10^2} \over {\pi \over 4}} = 36.055 ft</math></ref> This would be impractical due to the high shipping requirements, internal supports, [[spray nozzle]]s and other internals. Plus this single vessel would not incorporate [[redundancy (engineering)|redundancy]] for [[preventive maintenance]].
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| ===Limitations===
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| Typical FRP [[temperature]] limits are almost entirely based on the resin. The thermoplastic resin will suffer from [[creep (deformation)|creep]] at elevated temperatures and ultimately fail. However, new [[chemistry]] has produced resins that claim to be able to achieve even higher temperatures, which expand this field immensely. The typical maximum is 110 degrees celsius.
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| ===Design standards===
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| GRP Tanks fall under regulation of several groups.
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| *[[Bs4994]]-87 is the [[British Standards]] Standard for FRP Tanks and Vessels
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| *[[ASME]] RTP-1 (Reinforced Thermoset Plastic Corrosion Resistant Equipment) is the standard for FRP tanks and vessels held within the [[United States]] under 15 [[psig]] and located partially or fully [[wiktionary:above|above]] [[Soil|ground]]. Typical [[design]] parameters and specifications will require either compliance with ASME RTP-1 or accreditation from ASME.
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| *[[ASTM]] 3299 which is only a product specification, governs the filament winding process for tanks. It is not a design standard.
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| *[[SS245:1995]] Singapore Standard for Sectional GRP Water Storage Tanks.
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| ====Bs4994====
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| It is to avoid the uncertainty associated with specifying the thickness alone, that BS4994 introduced the concept of "unit properties". It is property per unit width, per unit mass of reinforcement. For example, UNIT STRENGTH is defined as load in Newton per millimeter (of laminate width) for a layer consisting of 1 kg of glass per square meter. i.e. the unit is N/mm per Kg/m2 glass
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| ====ASME RTP-1====
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| In RTP-1 specifications, the primary concerns relate [[Stress (mechanics)|stress]] and [[Deformation (mechanics)|strain]], such as hoop stress, [[axial stress]], and breaking stress to the physical properties of the material, such as [[Young's modulus]] (which may require an anisotropic analysis due to the filament winding process). These are related to the loads of the design, such as the internal [[pressure]] and strain.
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| ====BS EN 13121====
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| This European standard replaces BS4994-87 which is marked now as Current, Obsolescent, Superseded.
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| ====SS245:1995====
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| This is the Singapore Standard for sectional GRP water tank, which is current.
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| ==See also==
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| * [[BS EN 13121-3]]
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| * [[BS 4994]]
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| ==References==
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| <references/>
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| == Further reading ==
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| * {{cite book|
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| isbn=0-580-15075-5|
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| title=BS 4994:1987 – Specification for design and construction of vessels and tanks in reinforced plastics|
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| date=1987-06-30|
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| publisher=British Standards}}
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| * {{cite web|
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| url=http://www.admc.esrtechnology.com/CDKB/CaseStudies/Pressure%20vessel%20design%20case%20study/|
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| title=Pressure Vessel Design Case Study|
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| publisher=ESR Technology}} — a case study of the design process of a cylindrical vessel, using the BS 4994 methodology
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| * [http://www.FRPdesigns.com FRP Chemical Equipment Design Centre]
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| * [http://www.Fibrograts.com FRP Tanks and Vessels manufacturing]
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| [[Category:Storage tanks]]
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| [[Category:Sewerage]]
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| [[Category:Containers]]
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| [[Category:Scrubbers]]
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| [[Category:British Standards]]
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purcase and download - WPZOOM Tribune wordpress Theme, find and use the WPZOOM Discount Code. But as expected the level of support you get with them can be hit or miss based on the developer's free time and desire. With the free Word - Press blog, you have the liberty to come up with your own personalized domain name. Apart from these, you are also required to give some backlinks on other sites as well. But in case you want some theme or plugin in sync with your business needs, it is advisable that you must seek some professional help.
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