Wiring System Design: Cable Tray VS. Conduit

 

 

To be useful, electrical wiring must get from one place to another. Distribution is a necessary phase of system wiring design in order to get power or impulse signals to their final destinations.

Historically, wires and cables have been pulled through conduit. Plant environments are characterized by patterns of plentiful parallel conduit runs. Conduit continues to be the mainstay of electrical power distribution.

However, cable trays are making inroads into industrial plants. In Canada, about 85% of industrial plants use cable trays instead of conduit. That figure is somewhat smaller in the U.S., accounting for less than 50% of industrial plants using cable trays. But the trend in the U.S. is moving toward cable tray use. To date, the U.S. data and communication cable market has readily accepted wire cable tray, while power system engineers and contractors are yet to fully embrace this trend. Wire cable tray is still a relative newcomer to the electrical power segment of the market.

 

Cable tray

According to the National Electrical Code, a cable tray system is “a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.”

Cable tray advantages include wiring system design flexibility, simplicity, and lower installation cost. In plants where equipment is added, taken away, or is moved, cable trays provide a flexible advantage. Cable trays can typically adapt to complex configurations with a simple set of tools. The cost of material procurement for cable tray systems is not necessarily lower than that of conduit systems in all cases. However, compared to labor cost of conduit installation, cable trays present significant savings.

 

There are six basic cable tray types:

• Ladder — provides solid side rail protection, system strength, smooth radius fittings, and a wide selection of materials and finishes. Ladder cable tray is generally used in applications with intermediate to long support spans

• Solid bottom — provides nonventilated continuous support for delicate cables with added cable protection available in metallic and fiberglass. Also available are solid bottom metallic trays with solid metal covers for nonplenum-rated cable in environmental air areas. Solid Bottom cable tray is generally used for minimal heat-generating electrical or telecommunication applications with short to intermediate support spans.

• Trough — provides moderate ventilation and added cable support frequency, with the bottom configuration providing cable support every 4 in. Available in metal and nonmetallic materials, trough cable tray is generally used for moderate heat generating applications with short to intermediate support spans.

• Channel — provides an economical support for cable drops and branch cable runs from the backbone cable tray system. Channel cable tray is used for installations with limited numbers of tray cable when conduit is undesirable.

• Wire mesh — provides job site or field-adaptable support systems primarily for low-voltage wiring. Wire mesh tray generally is used for telecommunication and fiber optic applications. Wire mesh tray systems are typically zinc plated steel wire mesh.

• Single rail — provides the quickest system installation and the most freedom for cables to enter and exit the tray system. Typically, single-rail cable tray is used for low-voltage and power cable installations where maximum cable freedom, side fill, and installation speed are factors. These aluminum systems may be single-hung or wall-mounted systems in single or multiple tiers.

 

Cable tray configurations

Straight sections are available to route cables in a horizontal or vertical plane. Fittings route cables in various directions in either the horizontal or vertical planes. Typical fittings include elbows, tees, crosses, and risers. These fittings are available in various radii and bend angles.

Support methods include trapeze (single or multitier), hanger rod clamps, “J” hangers, center hung support, wall support, underfloor support, and pipe stanchions. Trapeze supports are recommended in applications where cables will be pulled through the cable tray. Center-hung supports typically are used when cables will be installed from the side of the cable tray. Also, center-hung supports are especially useful when future cable additions are necessary.

Wall and underfloor supports are useful when ceiling structure is not available or undesired. Outdoor installations are controlled by the structures available to support the cable tray.

 

Conduit

The primary benefit of conduit systems is the ability to ground and bond. Grounding and bonding play a significant role in minimizing electromagnetic interference (EMI). Steel conduit reduces electromagnetic fields by up to 95%, effectively shielding computers and sensitive electronic equipment from the electromagnetic interference (EMI) caused by power distribution systems.

Benefits of conduit include:

• Competitive life-cycle costs

• EMI shielding

• Physical protection of conductors

• Proven equipment grounding conductor

• Chemically compatible with concrete

• Coefficient of expansion compatible with common building materials

• Noncombustible

• Recyclable

• High tensile strength

 

 

There are two primary reasons to use steel conduit. According to the Steel Tube Institute of North America, steel conduit is the best possible protection of your electrical conductor and wiring systems, and it facilitates the insertion and extraction of conductors and wiring. Steel conduit is used in more than 50% of U.S. manufacturing and other industrial facilities in a variety of indoor, outdoor, and underground applications, including those where corrosive and hazardous conditions exist.

 

The three basic types of steel conduit and their applications are:

• Rigid metal conduit (RMC) has the thickest wall, making it the heaviest steel conduit. Inside and outside are zinc-coated to provide corrosion resistance. RMC can be used indoors, outdoors, underground, and in concealed or exposed applications

• Intermediate metal conduit (IMC) has a thinner wall and weighs less than RMC. A zinc-based coating is used on the outside; an organic corrosion-resistant coating is used on the inside. IMC can be used for the same applications as galvanized rigid metal conduit

• Electrical metallic tubing (EMT) is the lightest weight steel conduit manufactured. EMT is made of galvanized steel and is unthreaded. It is joined by setscrew, indentation, or compression-type connectors and couplings. This joining method makes EMT easy to alter, reuse, or redirect. Even though EMT is made of lighter-walled steel, it provides substantial physical protection and can be used in most exposed locations except where severe physical damage is possible.

RMC, IMC, and EMT are permitted as an equipment grounding conductor in accordance with NEC 250.118. A supplementary equipment grounding conductor sized in accordance with NEC 250.122 may be added as well. If a supplementary equipment grounding conductor is used, it is still important to comply with NEC 300.10 and 300.12, since approximately 90-95% of the ground current flows on the conduit and not in a supplementary conductor.

 

Environmental considerations for conduit

The coefficient of expansion for steel conduit/EMT is 6.5×10-6in./in./deg F. This is significant as it relates to whether or not expansion fittings would be required in a particular application. Expansion fittings are installed where significant temperature differentials are anticipated. These temperature shifts cause materials to expand and contract and could result in the conduit being pulled apart at the joints. Expansion fittings are not normally required with steel conduit/tubing because their coefficient of expansion is similar to that of other common building materials. However, when steel conduit is installed on bridges, rooftops, or as an outdoor raceway span between buildings, expansion fittings may be required. In these types of installations, there is a probability that expansion and contraction would occur, resulting from the direct heat of the sun coupled with significant temperature drops at night.

Couplings that accommodate thermal expansion while maintaining grounding and bonding integrity are now available. Such a coupling uses an internal bonding jumper to maintain electrical continuity. An internal, keyed, sliding bushing allows conduit movement. Installation is simple, requiring no disassembly. These couplings are installed by sliding the fitting onto the moving conduit until it stops at the internal slide bushing, then tightening. The next step is to tighten the gland nut with a wrench to compress the packing, creating a weather-resistant seal around the moving conduit. The final step is to thread the next length of conduit (stationary) into the other end of the fitting.

 

How to choose cable trays?

When selecting cable trays, cable tray configurations, and support methods, seek the answers to the following questions:

Where will the cable trays be used?

Job site and installation considerations include:

Indoor

• Support locations available affect the length and strength of the system.

• Industrial installations may require a 200 lb concentrated load.

• Office installation may make system appearance, system weight, and space available important factors.

• Environmental air handling areas may affect cable types, cable tray material, or cable tray type, as well as the potential need for covers.

• Classified hazardous locations affect the acceptable cable types.

Outdoor

• Available supports affect length and strength requirements.

• Environmental requirements include loads, ice, wind, snow, and possibly seismic situations.

• Corrosion requirements affect materials and finishes.

• Classified hazardous locations affect acceptable cable types.

What types of cables will be supported, and how many?

• NEC cable fill requirements dictate size, width, and depth of cable tray.

• Cable support requirement may necessitate bottom type.

• Largest bending radius of cable controls fitting radius.

• Total cable weight determines load to support.

What are the future requirements of your system?

• Cable entry/exit freedom may change.

• Designing a partially full or an expandable system may produce big savings later.

• Support type should allow for expansion needs.

Conduit installation tip

• Conduit having factory-cut threads are supplied with corrosion protection applied.

• Field cut threads are required to be coated “with an approved electrically conductive, corrosion-resistant compound where corrosion protection is necessary,” according to NEC 2002 300.6 (A). Field-cut threads should be protected from corrosion if they will be installed in wet or outdoor locations. Protect the thread surface with conductive rust resistant coating such as zinc-rich paint. Other conductive coatings are appropriate as well.

• Field threads should be cut one thread short. This ensures a good connection and allows the entire thread surface to be inside the coupling.

 

Do you need Hot Dipped Galvanized Cable Tray price?

 

 

Yong Chang takes honesty as the foundation, cherishes reputation, provides high-quality products, and provides the best after-sales service to repay customers. We sincerely welcome customers from all walks of life to visit our company and contact us with valuable suggestions to obtain ask for the price and parameters of hot-dip galvanized cable tray.

What are the Types of Cable Trays?

 

 

What are Cable Trays?

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Cable trays are used for providing mechanical protection in an environment where large quantities of power control cables are at work. Besides providing mechanical protection, these cables are also designed to facilitate a perfect routing path for power or control cables. These cables could be both overhead and under-ground.

There are a variety of cable trays available in different materials. Cable tray manufacturers make cable trays with galvanized steel, aluminium, stainless steel and glass-fiber reinforced plastic. Making a decision about which cable tray to choose completely depends on the usage and installation environment. Here the installation environment refers to taking into account electrical considerations as well as corrosion. Besides, cost is also an important decisive factor to be taken into account while picking cable trays. Let’s take a look at various types of cable trays:

 

Types of Cable Trays

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1. Steel Cable Trays

Cable tray manufacturers also recommended using steel cable trays. They are highly popular because of several qualities and benefits. Steel cable trays offer exceptionally high strength and are low cost also. The only downside to steel cable trays is their high weight and lesser corrosion resistance. Apart from these cons, these cable trays are really ideal to use in a variety of applications.

2. Aluminium Cable Trays

Cable trays manufactured with aluminium by cable tray manufacturers in India are known as aluminium cable trays. Typically, these cable trays can be used in almost any environment. They have a repute of having a good strength-to-weight ratio and commendable resistance to corrosion. That’s not it. These cable trays are easy to install and are also advantageous because of their light weight. According to fastener manufacturers in India, these cable trays are approximately 50 percent lighter than that of steel cable trays.

3. Stainless Steel Cable Trays

Stainless steel cable trays are also widely used across various industries. They are highly resistant to dyestuffs. Besides, great resistance to organic as well as inorganic chemicals in extremely high temperatures is the hallmark of stainless steel cable trays.

4. Solid Bottom Cable Trays

If you are using sensitive circuits, then solid bottom cable trays are the best pick. These cable trays contain a solid bottom part with a solid cover. For superior EMI or RFI protection, these cable trays must be used. All fastener manufacturers in India recommend the same.

5. Ladder Type Cable Trays

It might surprise you that 80 percent of the cable trays used in any industry is ladder type cable trays. Moisture doesn’t accumulate in this cable tray type.

 

Hebei Yongchang Composite Material Technology Co., Ltd. is a leading frp cable tray manufacturer in China, with strong technical force, first-class equipment and advanced technology. We main provide glass frp cable tray, steel cable tray, polymer composite cable tray. For any queries about any cable tray types, feel free to get in touch with us. Stay tuned!

FRP PIPES: HISTORY, PRESENT AND CHALLENGES

 

 

Composite materials like FRP or fiber-reinforced plastic are used commonly in manufacturing and construction. As a composite material FRP has many advantages that make it extremely durable, even when exposed to a corrosive environment. It is used in the handling of all kind of materials, including, their storage and transfer.

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One of the most commonly seen applications for FRP is FRP pipes. Laid underground, overhead, in seawater as well as factories, FRP pipes find common usage because of their load bearing capacity and resistance to corrosion. Although it is seen as a modern product, the history of FRP is actually quite old, dating back almost 65 years!

 

History

The first product that can be labeled as an FRP product is Bakelite. It was invented by Leo Baekeland who was actually looking for a replacement for shellac. In 1905 it was while he experimented with formaldehyde and phenol that he stumbled upon various compounds. One of these was hard material that could be moulded. This was Bakelite.

 

In the 1930spioneers like Norman de Bruyne were actively looking into the development of FRP for commercial use, especially in the aviation industry. The breakthrough came when Games Slayter, a researcher, found a way to mass produce glass strands in1932. This was an accidental result that occurred when he focused a stream of compressed air on molten glass. This resulted in the production of fine fibers.

 

The same method was later used by Owens Corning to produce ‘fibreglas’. Spelled with a single s, it was a patented product. This was actually glass wool in which fibers trapped gas. In 1936 du Pont found a resin that could combine "fibreglas" with a plastic. While the earlier avatar was a very effective insulator, this new composite showed strength and the potential for a much wider use.

 

Developments in fiberglass continued extensively in the automobile and aviation industry. Meanwhile, the invention and production of carbon fibers and aramid fibers further advanced the developments with the industry.

 

But the global scale of FRP we see today came only in mid 20th century when technology brought in new material and enabled mass production. Finally, it was in the 70s that worldwide production of FRP exceeded steel, becoming the mass produced industrial and construction material that we see today.

 

FRP pipes today

FRP is today used for a number of structures, including handrails, guardrails, ladders and platforms. But one of the most common application is in making FRP pipes. FRP pipes are used to transport all kinds of liquid. Some of the areas where FRP pipes are used are:

• Automobile industry

• Water distribution

• Chemical industry

• Wastewater management

• Construction industry

• Oil exploration and offshore projects

 

FRP: Issue and concerns

Although FRP pipes have emerged one of the most commonly used applications, its popularity is still hampered by certain issues. Let us explore some of them:

 

Quality:

Like any industrial material, quality of the parts determines its functionality. Although there are a number of very reliable FRP pipes manufacturers in India, it is still important to check the quality of the pipes. The best way to do so is by checking ISO and ASTM standards. The standards are laid down specifically to ensure that buyers can ascertain the tensile strength and load bearing capacity of a pipe.

 

Installation:

The functionality of an FRP pipe will eventually depend on its installation. Any loose fittings can result in leakages and eventual collapse of the pipe layout. This also includes the installation of suitable pipes. The selection of a pipe depends load bearing capacity, which can differ from one pipe to another. So, its important to ascertain the pressure of the liquid before one select the pipe.

 

Price:

FRP as a raw material can be more expensive than some alternatives like steel. However, it is much more economical by a long-term perspective. It is less expensive to install and maintain. It is also far more resistant to corrosion, giving one a better value for money.

 

Disposal:

One of the major concerns regarding FRP usage is its disposal and recycling. FRP products are usually impossible to break down into its constituent parts. This makes the disposal and recycling of FRP pipes, which has plastic as part of its constituent elements, an environmental hazard.

Fundamentals of FRP Acid Storage Tanks and Its Specifications: Industrial Acid Storage

 

 

Acid storage tanks are mostly made from FRP, XLPE, HDPE, and carbon steel. The tanks have a specific gravity of 1.9. However, secondary containment is also necessary. It is better to store the acids out of direct exposure to the sun. Usually, the capacity of such tanks ranges between 35 and 100,000 gallons as told by a leading acid storage tank manufacturer.

 

Sulfuric Acid

When it comes to acid storage for industrial purposes, the most common name that comes to mind is sulfuric acid.

• The acid is chemically known as H2SO4.

• It is used as battery acid. It is also used as dihydrogen sulfate.

• Industries use this acid to produce phosphate fertilizers, phosphoric acid, lead-acid car batteries, and other chemicals.

• The acid should be handled correctly and stored in the right place.

• Storage needs are mostly dependant on the concentration of the acid.

 • It is needed to have prior approval from storage tank manufacturers for the applications of the acid.

 

Proper storage of sulfuric acid

The acid should be kept in particular containers. The containers must be made from corrosion-resistant materials to ensure the stability, safety, and longevity of the tank. The specifications, however, may differ depending on the specific concentration of the acid. If you fail to store the acid in the proper container with proper gaskets and fittings, corrosion can take place. It may also compromise the structural integrity of the tank. And that can cause potential safety hazards and expensive repairs. Choose the right container for storing sulfuric acid to avoid exothermic reactions.

 

 

The acid should be kept in a dry and cool area away from direct sun exposure, ignition sources, and heat. In fact, all incompatible materials should be avoided to keep in close contact with the acid. For bulk storage of the acid, secondary containment measures should also be taken. Don’t forget to inspect and maintain the tank on a regular basis by a professional to ensure proper storage.

 

FRP tanks for sulfuric acid storage

Fiberglass reinforced plastic or FRP is widely used by the acid storage tank manufacturer for making acid storage tanks. Such tanks are just perfect to store H2SO4 of 80 wt% or more concentration. However, they are not recommended for storing acid with more concentration. Strength more than 80 percent can badly corrode the vinyl ester resins of such tanks. This is even truer when the solution temperature becomes raised to 100 to 120 degrees Fahrenheit or above. This is a great concern regarding the dilution of the acid. If you add water to the acid, it can produce significant heat. And if the temperature rises above allowable thresholds, the stability of the tank structure would be compromised. And thus it is highly forbidden to dilute the acid in the FRP tank.  

 

Storing acids, especially sulfuric acid, should be done properly. It can be stored in tanks made of FRP, XLPE, HDPE, and carbon steel. Otherwise, it can cause potential safety hazards. FRP would be a good option to store H2SO4 of 80 wt% or more concentration.

 

We are an FRP Storage Tanks supplier, please feel free to contact us if you need them!

The Internal Structure of the FRP Storage Tank and Repair Method

 

 

Not many people know the internal structure of FRP storage tanks. FRP tank wall is divided into an internal layer, secondary internal layer, and external surface. Next, we introduce these internal structures.

 

FRP storage tank internal structure

1. FRP tank lining layer

FRP storage tank lining layer consists of the inner surface layer and secondary inner layer, the matrix should be used bisphenol A type unsaturated polyester resin, vinyl ester resin, and other resins with excellent corrosion resistance. Reinforcing materials are glass fiber surface felt, glass fiber short-cut raw silk felt and glass fiber untwisted roving cloth, etc.

2. FRP storage tank secondary inner layer

It is made of general-purpose unsaturated polyester resin as the matrix and glass fiber twist-free roving as the reinforcing material. Resin content is 45%-50%, the thickness of the layer is determined by the design calculation.

3. FRP storage tank outer surface layer

The unsaturated polyester resin with excellent weather resistance is used as the matrix, and the glass fiber surface mat or glass fiber untwisted roving cloth (thickness less than 0.16mm) is used as the reinforcing material, with resin content more than 55%, and the thickness of the layer is 0.2-0.5mm.

 

Repair of FRP storage tank

Although the FRP performance is superior, in terms of hardness, corrosion prevention is good, but also for one reason or another, resulting in FRP storage tank leakage, and FRP damage, in most cases to replace the main, repair is very difficult, usually with the gluing method or hot welding method to restore it, here is a brief introduction to the gluing method of repair.

(1) cleaning FRP storage tank. First of all, the damaged tank will be disassembled first, clean and dry it, and do the prerequisite work of repair.

(2) according to the size of the broken part cut appropriate large glass fiber cloth, after baking wax removal, heating until not smoking, take care not to fold.

(3) Glue preparation. There are many kinds of glue formulations, but in general, the epoxy resin and polyamide resin two kinds of resin in the ratio of 1:1 into a wide mouth container, stirring with a stick, the viscosity is generally good to lift the stick does not pull the wire, pay attention to the principle of rather less than more, not too much at a time, to just enough to use up as good, followed by uneven mixing, with a good glue after a period of time will be Self-curing, resulting in waste.

(4) Apply glue. First, use a stiff brush to brush a layer of glue in the inner surface of the glass fiber reinforced plastic tank, and then the prepared glass cloth on the surface of the glue, gently pat the pressure to make it fit tightly so that the glue penetrate the glass cloth; the first layer of good penetration and then coated with a second layer of glue, paste the second layer of glass cloth. So the cycle coated a few layers on it, take care not to get too thick in the coating and framing.

(5) Curing. After painting a higher temperature place to let its natural curing, although it takes a longer time, but definitely not with open fire baking. Wait for its natural curing, and then polish the edges, openings, after spraying, the repair is complete, the glass fiber reinforced plastic tank and restore the strong and durable.

 

We are an FRP storage tank supplier, please feel free to contact us if you need them!

Can FRP pipes be customized?

FRP (glass fiber reinforced plastic) has good designability, shape performance and easy maintenance. Compared with steel, FRP (glass fiber reinforced plastic) has very high corrosion resistance, the specific gravity of 1.5 to 1.9, much lower than steel's 7.8, but its mechanical strength is higher than steel, FRP containers have the advantages of a low coefficient of thermal expansion and good insulation performance, and have been widely used in many fields Applications.

 

According to the shape of the medium, FRP containers can be divided into three categories: liquid, gas and solid tanks; according to the pressure level, they can be divided into two categories: ATM tanks and pressure tanks; according to the shape of containers, they can be divided into three categories: horizontal cylindrical tanks, vertical cylindrical tanks and rectangular tanks; and PVC/FRP, PP/FRP and PVDF/FRP composite tanks.

 

Hebei Yongchang Composite Technology Co., Ltd. is a professional FRP container manufacturer in China. With exquisite technology, reliable quality and good reputation, Hebei Yongchang FRP containers are widely used in chemical fertilizer and pesticide, electronic and electric power, pharmaceutical, petrochemical, water treatment, citric acid and food fermentation, and can be manufactured with a maximum diameter of 25000mm, volume is 5000m.

 

Special attention needs to be paid here.

When ordering FRP pipe, the following data needs to be provided to us.

Pipe diameter

Design and working temperature of the working fluid.

Design, operating, surge, vacuum, and test pressures.

Live load of the buried pipe.

Maximum/minimum burial depth and trench width.

Detailed information on soil properties and trench preparation.

 

Yongchang FRP pipe performance and characteristics

1. Corrosion resistance: Different types of anti-corrosion lining resins are selected for different acid, alkali and salt environments, as well as various oils, seawater and organic solvents.

2. Lightweight, easy to maintain and durable.

3. Easy to install: There is no technical limitation on the length of the FRP pipeline, but considering transportation, the length of the pipeline is generally less than 12m, so the number of joints is greatly reduced. Due to the lightweight of FRP, the pipeline can also be installed manually or by light installation equipment, which is convenient and fast.

4. Good applicability: the existing FRP pipeline standard diameter is between 25mm-4000mm, the long-term pressure-bearing capacity is generally less than 1.6Mpa, and according to the special needs of users, it can reach a higher pressure of 6.4Mpa.

5. High conveying capacity: smooth pipe wall N-S 0.0084. It has a higher flow rate compared with a traditional pipeline of the same diameter, so it can save pump energy and prolong project life.

6. Low permeability: Due to the good sealing connection and the longer length of each pipe, FRP pipes have lower permeability than traditional pipes, thus greatly reducing the risk of groundwater infiltration into the pipes and media penetration as well as pollution of the environment.

7. Strict testing standards: Our company has advanced testing equipment and strictly enforces inspection standards to ensure product quality. Relevant standards: ASTM, AWWA, ASME, etc.

8. Low cost and long life: Hebei Yongchang FRP products have a long service life, basically no maintenance, and very low installation and transportation cost.

 

FRP pipe connection requirements

Interface operation, the ambient temperature is not less than 10 ℃; curing temperature after bonding is not less than 15 ℃, curing insulation time is not less than 12 hours. Paste the interface according to the layer design. According to the sample data, planned gel time, ambient temperature, etc., mix the resin and stir it thoroughly. When the bonding thickness is more than 10mm, it should be formed in stages. Before each molding, the curing surface of the last molding should be sanded.

 

Our Yongchang FRP / FRP pipes are designed and manufactured according to customer requirements in various sizes and configurations. We can manufacture pipes of any size and pressure and can make composite pipes such as PVC/FRP, PP/FRP, PVDF/FRP, etc. according to the conditions of use. Our designers can calculate the circumferential stress, axial stress and bending Poisson's ratio coefficients of products based on your available space, chemical fluid requirements and applicable natural conditions, and then give product selection, product thickness and layering. We have detailed manufacturing process parameters. All of our pipe designs meet industry standards such as ASTM D2996 Standard Specification for Fiber Wound "Glass Fiber" (Glass Fiber Reinforced Thermoset Resin) Pipe for Fiber Wound Pipe.

 

Common codes and standards that govern the details of FRP pipe are

ISO 7370

ANSI/AWWA C950

AWWA M45

ISO 14692

AWWA C590

ISO 10467

BS 5480

ISO 10639

ASTM d2996, ASTM d2997, Astm d5421, Astm d4024, Astm d5685

 

Yongchang offers long-term corrosion solutions and the absolute longest product life for standard fiberglass tubes, custom tubes, special manifold systems, pipes, or chimneys. Contact us and you can get advice from our professionals depending on the use scenario!

Guide to installing FRP pipes

Although installation is not usually considered part of the design of a piping system, it is an important part of a successful system and we feel it needs to be emphasized here. There is no doubt that more problems occur in FRP piping systems due to improper installation than any other single cause, and there are many steps that must be followed to ensure that problems do not occur in the future.

 

① FRP pipe should be inspected for appearance and size before construction, and accepted according to the factory certificate of conformity.

② Pipeline installation drawings are the basis for pipeline installation works, the laying of FRP/PVC pipe (including the form of connection, coordinates, elevation, slope, slope direction, etc.) support, FRP/PVC pipe and equipment, pipeline accessories connection, pipeline accessories installation location, support, etc., should be in line with the design drawings, such as changes, must be resolved in consultation with the design unit.

③ Pipe installation, according to the pipe section divided by the pipe installation diagram, can be installed from one end of the pipe in order to the other end of the pipe accessories, and then set up brackets or supports (if necessary, temporary support is required during the installation process). When the pipe is lifted, the outer wall surface must take protective measures, and direct contact with the wire rope is prohibited, so as not to cause local stress.

④ The connection point of FRP pipe is only allowed in the straight pipe part. The distance between the butt welding connection point and the edge of the pipe support should be greater than the outer diameter of the pipe and not less than 100mm; the distance between the socket connection and the edge of the pipe support should be greater than 150mm.

⑤ The connection structure of the pipe is in the form of socket connection, flange connection (welded ring flange connection and composite flat welding flange connection), and butt welding connection. This project will determine the installation method according to the specific requirements of the design documents.

(6) The installation workers engaged in welding must hold a welder's certificate and be familiar with the performance of FRP/PVC pipe adhesive and its installation method, and have skilled PVC welding operation ability.

(7) Before the pipe is connected by socket, the inner wall dirt of the PVC pipe should be removed from the connection, and then the socket should be inserted into the socket, and the socket should not be skewed, cracked or other defects, and the socket depth should be reached before PVC welding is carried out.

⑧ The socket part should be enhanced by FRP, evenly coated with a layer of R glue at the enhancement, coating thickness is uniform, shall not leak and flow, then wrap a layer of glass cloth, coated with unsaturated resin, wrap glass cloth, repeatedly until the thickness reaches the requirements.

⑨ When the socket installation fails to pass the need for rework, the socket plug and socket must be re-made, and shall not use the used socket plug.

⑩ When flange is connected to the pipe, both inside and outside sides must be welded to the pipe, the flange surface and pipe axis inclination should be less than or equal to 1/100 of the outside diameter of the pipe. flange connection should be strictly aligned, the maximum allowable deviation in the axial direction is not more than 2mm, and the method of strong tightening bolts should not be used to eliminate skew. Tighten the bolts in two times, the first time evenly and symmetrically screwed once, and then tighten the bolts again.

 

FRP pipe connection requirements

When the interface works, the ambient temperature is not less than 10℃; the curing temperature after bonding is not less than 15℃, and the curing holding time is not less than 12 hours. Design the paste interface according to the laminate. According to the sample data, planned gel time, ambient temperature, etc., mix the resin and stir thoroughly. When the bonding thickness is more than 10mm, it should be formed in stages. Before each molding, the cured surface of the last molding should be polished.

 

Yongchang specializes in the production of various, FRP chemical storage tanks and FRP process tube can be customized! Ex-factory price, perfect after-sales service.