If you work in an industry like wastewater treatment, paper and pulp manufacturing, oil and gas, chemical manufacturing, or another setting where storage and process tanks are common, you&#;re probably familiar with fiberglass reinforced plastic, or FRP, tanks.
Their strength and resistance to corrosion make them a versatile solution with a long useful life &#; exactly what you want from a capital investment.
But that durability means if you need a new tank, it may have been a while since you&#;ve had to write specifications for one. Here&#;s a quick review of materials and construction to help with your next new tank project.
Contact us to discuss your requirements of FRP Special-Shaped Equipment. Our experienced sales team can help you identify the options that best suit your needs.
Glass fibers
Glass fibers give finished FRP tanks and structures their strength due to their high tensile strengths. While E and C glass are commonly used in fiberglass tank applications, there are several options, depending on what&#;s needed, for example:
- E glass is electrically resistant and commonly used in FRP applications
- ECR glass combines strength, electrical resistance, and corrosion resistance
- C glass is resistant to corrosion and used in acidic applications
The fibers used in FRP structures are also called glass roving &#; very thin strands of glass that are made into different products:
- Woven fiber cloth comes in different thicknesses and weights and is measured in ounces per square yard.
- Chopped-strand mat is made of roving, often E or ECR glass, and held together in a matrix with a thin layer of sizing/binder resin to provide structure. It&#;s measured in ounces per square foot.
- Gun roving is a continuous strand of roving fed into a chopping gun for spray applications.
- Filament winding roving comes in varying weights, measured in yards per pound, and ranges from just under 100 yards per pound to several hundred yards per pound.
Resins
Resins provide corrosion resistance and help to distribute loads among the glass fibers in the finished FRP matrix. There are many options, depending on the composition and concentration of a tank&#;s contents as well as if it will be used for storage, mixing, scrubbing, or another purpose.
Many resins are forms of polyester or vinyl ester, with specific chemical compositions to withstand corrosion, heat, fire, or other conditions. Examples of common types of resins include, but are not limited to:
- Bisphenol epoxy vinyl ester, which is very strong and durable and withstand changes in temperature well.
- Epoxy novolac vinyl ester, which may be used with acidic solvents.
- Bisphenol fumarate polyesters, which are used for high-temperature applications (over 300 degrees Fahrenheit) and when rigidity is needed.
- Bromated polyester and vinyl ester resins, which have thermal resistance and flame-retardant properties.
- Terephthalic and isophthalic polyester resins, which are used for lower temperature applications (under 200 degrees Fahrenheit) and lesser acidic or basic pHs.
Along with resin selection, fabricators can include different types of resin additives to control the curing process and optimize the finished tank for environmental or use conditions. Common additives include:
- Promotors to influence cure characteristics such as the speed of drying. Many vinyl esters do not contain promotors in order to allow fabricators to customize the properties of a resin to the needs of the application.
- Initiators/catalysts to start the resin gelling process.
- Accelerators to speed up chemical reactions and cure time.
- Inhibitors to slow or extend gel time.
- synergists, including antimony oxides, to control fire retardancy and flame spread.
- UV absorbers to protect tanks from damage caused by exposure to UV rays from the sun.
- Color pigments for aesthetic or functional purposes (e.g. reducing heat absorption).
Fabrication
Construction methods of FRP tanks and structures fall into two main categories: hand lay-up and filament winding.
Hand lay-up includes placing layers or plies of thin woven fiber on a mold or spraying chopped fiber on a mold with a handheld gun applicator. Each layer is laminated with resin and air bubbles are rolled out to avoid creating air pockets (also called voids) developing during curing. Large tanks or structures can be fabricated as a single unit or in panels that are later joined, similar to how a barrel is constructed. This can be helpful when tanks are assembled on-site indoors or in areas with space restrictions.
Filament wound tanks are fabricated by winding strands of glass roving around a rotating spindle, usually on a diagonal. The diagonal angle can be adjusted to optimize hoop strength (i.e. the strength around the circumference of the tank) and axial strength (i.e. end to end, often vertically). Several thin strands are usually held together, similar to rope or yarn, and the weight of the roving used depends on the application. The maximum diameter of a filament wound tank is determined by the size of the fabricator&#;s spindle.
Thin surface veil cloth can also be added for reinforcement against corrosion and UV exposure. Usually made of C glass fibers, surface veiling can be added to the inside or outside of a tank.
Accessories and other tank features
Tanks can be accessorized depending on the application. Options include the following, some of which we&#;ll discuss more in a future blog:
- manways or access ports to gain entry or clean out the tank
- inlets, outlets, and couplings for pipes
- ports for gauges and instrumentation (and supports for this equipment)
- flanges and tie-down lugs
- vents and covers
- drains, siphons, and weir plates
- internal mixing equipment
- heating and cooling coils
- nozzles and supports
- ladders, handrails, and walkways
It&#;s all in the details of your application
Your fabricator will review your specs and the details of your application, clarifying goals, and possibly suggesting alternatives to achieve the balance of longevity and cost. Details to describe include things like:
- temperatures
- external from the environment
- anticipated internal temperature fluctuations due to process conditions, mixing of chemicals or maintenance/cleaning procedures
- rate of temperature change anticipated (fast changes can compromise resin and structure integrity and corrosion resistance)
- pressure and hydrostatic load
- environmental conditions such as indoor or outdoor setting and UV exposure
- common name and chemical name
- pH of contents and anticipated changes to it
- concentration and chemical composition of contents
- specific gravity of contents
- process description including agitation or other process conditions
- pressure/vacuum conditions, especially if the tank will be filled with a pressurized system,
- flow rates
- fire retardancy requirements
One final tip: communication is the key. The more you can tell your FRP fabricator about tank content, use, and conditions the better they can customize tank to meet your unique situation. Contact us to discuss your new tank needs today!
Fiber-reinforced polymer (FRP) composites are becoming increasingly popular across the board.
As a result, a growing number of applications in sectors such as infrastructure, utilities, telecommunications, auto, sports and recreation, aerospace, marine, etc. are finding that FRP composites are well suited for their needs.
A composite is a composition material, typically consisting of a thermoset or thermoplastic polymer, reinforced with glass, carbon, aramid fibers, or combinations of materials.
How are FRP composite products manufactured? There are many ways to create fiberglass products (pultrusion, filament winding, gun roving, etc.), though pultrusion is the most commonly used.
Pultrusion is a manufacturing technique that converts reinforced fibers and liquid resin into fiber-reinforced plastic via a pulling method, rather than a pushing method (extrusion). This resulting plastic composite is also known as a fiber-reinforced polymer.
There are two main types of pultrusion systems &#;reciprocating (hand over hand) and continuous (cat track). Rovings (long, narrow bundles) of fiber reinforcements (typically glass or carbon) are positioned carefully by creels for correct placement in the composite before being fed into a guide plate.
Pultrusion produces FRP profiles with a constant cross-section and is projected to be one of the most promising segments of the composites industry. If you&#;d like to learn more about the process of making FRP, download and read our guide here.
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How do you decide on which FRP manufacturer to work with? This post will look at the most important factors to consider when you need to find a manufacturer for your project.
Standards & Certifications
When you are vetting a manufacturer, ask about their standards of quality management. Ensure that they are able to meet the specifications of your project. Ask that they submit the following:
- Manufacturer's qualification
- Product data
- Manufacturing plan and timetable
- Design calculations, usually signed by an engineer
- Shop drawings
- Samples
- Test reports
- Quality control
- Safety data sheets
Expertise and Experience
Look out for the expertise and experience of an FRP manufacturer. Find out:
- How long they have been in the fabrication business
- Years of experience of their engineers, especially the ones who will be working on your project
Check that the FRP manufacturer has a skilled team of individuals with experience in the industry. This will give you confidence that your project can be completed with top-notch results and that the end result will fully meet the needs of your specific application.
Tencom has a team of engineers, designers, quality supervisors, skilled technicians and project (lead) managers with many combined years of experience developing FRP profiles.
Our team understands target applications and makes recommendations to make sure each customer receives an ideal FRP profile for their specific application/s.
One of the biggest indicators of a quality FRP manufacturer is their experience level &#; the appropriate manufacturer will have the expertise and capabilities to fulfill the order correctly, on time and on budget. This saves both time and money and allows you to have peace of mind and confidence in the quality of the work that you're receiving.
Draw up a list of product and application requirements for your product. With this information, the manufacturer (supplier) can provide information on similar products they have supplied to other customers. The discussion and answers derived from this list can help you to make an informed decision.
Product Requirements:
- Are drawings available?
- What is the Annual Expected Usage?
- Why are they considering fiberglass, carbon fiber or aramid?
- Is it a new part?
- Do you have a specific resin system in mind: Polyester/ Polyurethane/Vinyl Ester/Epoxy?
- Are there part specifications, tolerances?
- Are there any ASTM, MIL, or UL specifications that the part must meet?
- What is the time frame for the project?
Application Requirements:
- What is the application?
- Will the part be painted, fastened, glued, or screwed to another surface or object?
- Will it require UV resistance from sunlight?
- Will it be exposed to chemicals (If so, which?)
- Will it be exposed to extreme temperatures? (High or Low)
- Does the part require abrasion resistance?
- Does the part require a high fatigue value?
- Does the part need to be fire resistant?
What are the other special needs required for this product, if any?
On-Site
Find out from an FRP manufacturer if they have a team available for situations should an expert in the field is needed. Most FRP profiles are prefabricated and ready for installation when the products are delivered. In a best-case scenario, an FRP manufacturer will send a technical representative to help with the installation and answer any project questions.
Generally, most pultruded profiles are sold as component parts to be assembled with other parts inside a factory. Most pultrusion manufacturers would be willing to send someone to that factory to evaluate and assist as and when needed. Although few parts are shipped to a (construction) job site for assembly or used as manufactured when it is done, the manufacturer would usually prefer to be involved but may charge a fee.
FRP Growth
The many advantages of FRPs are spurring their growth and increasing. It is undeniable that FRPs are changing the face of product manufacture and the industries they&#;re being applied in.
Currently, the global composites market size is pegged at $90.6 billion. By , it&#;s expected to grow to $131.6 billion at a compound annual growth rate (CAGR) of 7.7%. The growth of composites is rapid but is not surprising if you understand the benefits of using FRPs.
FRPs are the perfect option for any project because of their flexibility, exceptional performance properties, sustainability, design flexibility, and cost-effectiveness,
The Takeaway
Pultruded fiberglass rods, tubing and shapes can help project managers realize a wide range of design possibilities.
As a company, Tencom has been producing quality pultruded fiberglass products for over 22 years. If you have a design concept or product in mind and would like to learn more about the potential of FRPs, we'd love to talk to you. If you are interested in using FRPs for your next project and would like to find out more, contact us to see how we can help.
Are you interested in learning more about FRP Waste Water Collection Tank? Contact us today to secure an expert consultation!
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