FRP Vessels

Ink-blue Environmental Protection: Advanced Chinese manufacturers of FRP Vessels

 

Xi'an Ink-blue Environmental Protection Technology Co., Ltd. is a comprehensive supplier of water treatment equipment integrating design, production, sales, and installation. The business scope covers various industries such as drinking water production and treatment, sewage treatment, seawater desalination, medical, pharmaceutical, food, beverage, chemical, agricultural irrigation, etc. Ink-blue Environmental Protection Technology has won an excellent reputation in the water treatment industry with high-quality products and perfect pre-sales and after-sales services.

 

 
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What is FRP Vessel exactly?

 

INK-BLUE FRP vessel all size

FRP vessels, often referred to as “FRP tank” or “FRP filter vessel”, are an important component in the pretreatment system of a water treatment system.

It is a non-metallic composite material storage tank, made of resin and glass fiber through an automated PLC-controlled fiber winding process.

It can be filled with filter media such as quartz sand, manganese sand, activated carbon, and ion exchange resin to remove sediments, suspended solids, calcium and magnesium ions, and odors from raw water. Compared to traditional steel filter tanks, FRP tanks offer several advantages, including high strength, lightweight construction, good corrosion resistance, and the ability to withstand large temperature differences.

Currently, they have largely replaced traditional steel filter tanks and are widely used in many fields such as the chemical industry, water and wastewater treatment, food and beverage, mining and metals, power, energy, and high-purity applications.

 

 

 

Structure, material and accessory list of FRP Tank

 

Basic Structure

A basic FRP pressure tank consists of three parts: the tank itself, the opening, and the base. The size of the opening and the base are the same as the size of the upper and lower openings of the tank.

FRP vessel tank structural diagram

Opening

  • PPO material, thread connection (2.5" and 4")
  • Aviation aluminum, flange connection (6")

 

Base

  • Standard base: reinforced plastic (tank size: 6"–16");
  • Round base: reinforced plastic (tank size: 18"–21");
  • Tripod base: FRP (tank size: 24"–80")

 

Material Selection

FRP vessel liner production

Liner

The inner lining of large-diameter containers is made of glass fiber-reinforced polymer (GFRP), while the inner lining of small-diameter containers is made of a thermoplastic material, manufactured through a blow molding process. It has excellent chemical resistance and is manufactured using an integrated rotational molding and blow molding process. The finished product features seamless connections, high-pressure resistance, and leak-proof properties.

FRP tank manufacturing process diagram

FRP tank body

The tank housing is constructed using continuous filament winding of fiberglass-reinforced material and then sealed with epoxy resin. This process makes the container corrosion-resistant and completely leak-proof. We utilize computer-aided winding machines and other customized equipment to manufacture products that are high-performing and durable. 

 

Opening & Port

Picture

2.5’’ opening

4’’ opening

6’’ opening

Size

2.5’’

4’’

6’’

Material

PPO

Aviation aluminum

Structure

Thread

Flange

Features

Reinforced PPO modified plastic materials conform to the general international thread standard and have the characteristics of high strength, good pressure resistance, low heat deformation, wear resistance, and stain resistance.

Aviation aluminum materials can be applied to various complex media conditions. They exhibit more stable pressure resistance and a longer service life.

 

Base

Picture

Standard base

Round base

Tripod base

Base

Standard base

Round base

Tripod base

Material

Reinforced plastics

Reinforced plastics

Reinforced plastics

Applicable range

6’’-16’’

18’’-21’’

24’’-80’’

 

Accessories and Installation Location

FRP pressure tanks generally cannot be used alone. In the entire water treatment system, they need to be combined with core components such as water distributors, automatic valves, and central pipes to form the entire filtration system.

The price of a complete set is usually lower than the price of buying all the accessories individually. Therefore, we generally recommend that customers choose to buy the complete set.

water distributor model automatic valve model

The following is a diagram showing the installation locations of various components in an FRP pressure tank. Taking a 4-inch opening tank as an example, it requires both upper and lower water distributors. The specific component list will vary depending on the tank model.

Installation diagram of fiberglass tank accessories

 

 

 

Benefits of FRP Vessel

 

 

 

 

General model number coding rules and size table

 

FRP vessel coding rules

Small size:

coding rule small size

Large size:

coding rule large size

 

FRP vessel size chart

Model Diameter × Height (mm) Capacity (L) Amount of quartz sand that can be filled (kg) Amount of activated carbon that can be filled (kg) Amount of softening resin that can be filled (kg) Packaging volume (m³) Quantity can be packed in a 20GP (pcs) Quantity can be packed in a 40HG (pcs) 125 PSI packed weight (kg) 150 PSI packed weight (kg)
610-2.5'' 166 × 259 3.2 4.8 1.6 2.6 0.007 3800 7871 1.0 1.0
613-2.5'' 166 × 346 4.7 7.1 2.4 3.8 0.009 2956 6122 1.2 1.4
617-2.5'' 166 × 437 6.5 9.8 3.3 5.2 0.012 2217 4592 1.5 1.7
618-2.5'' 166 × 462 7.0 10.5 3.5 5.6 0.012 2217 4592 1.5 1.7
629-2.5'' 166 × 741 12.0 18.0 6.0 9.6 0.019 1400 2900 2.0 2.2
635-2.5'' 166 × 894 14.8 22.2 7.4 11.8 0.023 1157 2396 2.2 2.4
713-2.5'' 188 × 335 5.9 8.9 3.0 4.7 0.012 2217 4592 1.4 1.5
717-2.5'' 188 × 437 8.3 12.5 4.2 6.6 0.016 1663 3444 1.7 1.8
724-2.5'' 188 × 625 12.4 18.6 6.2 9.9 0.022 1209 2505 2.1 2.2
730-2.5'' 188 × 777 16.1 24.2 8.1 12.9 0.028 950 1968 2.4 2.6
735-2.5'' 188 × 894 18.8 28.2 9.4 15.0 0.032 831 1722 2.7 3.0
744-2.5'' 188 × 1124 24.2 36.3 12.1 19.4 0.04 665 1378 3.2 3.4
813-2.5'' 215 × 338 8.0 12.0 4.0 6.4 0.016 1663 3444 1.6 1.7
817-2.5'' 215 × 437 11.0 16.5 5.5 8.8 0.02 1330 2755 1.8 1.9
824-2.5'' 215 × 625 16.8 25.2 8.4 13.4 0.029 917 1900 2.3 3.0
835-2.5'' 215 × 895 25.2 37.8 12.6 20.2 0.042 633 1312 3.0 3.2
844-2.5'' 215 × 1125 32.5 48.8 16.3 26.0 0.052 512 1060 3.7 4.0
917-2.5'' 240 × 455 13.8 20.7 6.9 11.0 0.027 985 2041 2.3 2.4
935-2.5'' 240 × 900 31.1 46.7 15.6 24.9 0.052 512 1060 3.6 3.7
942-2.5'' 240 × 1073 37.8 56.7 18.9 30.2 0.062 429 889 4.5 4.6
948-2.5'' 240 × 1225 43.7 65.6 21.9 35.0 0.065 409 848 4.9 5.1
1017-2.5'' 266 × 429 16.4 24.6 8.2 13.1 0.031 858 1777 2.7 2.8
1019-2.5'' 266 × 494 18.8 28.2 9.4 15.0 0.035 760 1574 3.0 3.2
1024-2.5'' 266 × 622 25.0 37.5 12.5 20.0 0.044 605 1252 3.5 3.5
1035-2.5'' 266 × 896 38.8 58.2 19.4 31.0 0.064 416 861 4.2 4.4
1044-2.5'' 266 × 1135 50.0 75.0 25.0 40.0 0.08 333 689 5.0 5.4
1054-2.5'' 266 × 1380 62.5 93.8 31.3 50.0 0.098 271 562 6.0 6.2
1054-2.5''-2.5'' 266 × 1522 62.5 93.8 31.3 50.0 0.108 246 510 6.6 7.0
1236-2.5'' 318 × 920 55.6 83.4 27.8 44.5 0.093 286 592 5.0 5.7
1248-2.5'' 318 × 1233 77.5 116.3 38.8 62.0 0.125 213 441 6.0 7.1
1252-2.5'' 318 × 1333 85.3 128.0 42.7 68.2 0.135 197 408 7.5 7.9
1265-2.5'' 318 × 1633 108.5 162.8 54.3 86.8 0.165 161 334 9.0 9.3
1344-2.5'' 343 × 1100 81.1 121.7 40.6 64.9 0.13 205 424 7.0 8.9
1354-2.5'' 343 × 1350 102.3 153.5 51.2 81.8 0.159 167 347 8.0 9.8
1452-2.5'' 369 × 1336 115.3 173.0 57.7 92.2 0.182 146 303 9.4 11.0
1452-4'' 369 × 1336 115.3 173.0 57.7 92.2 0.182 146 303 9.4 11.0
1465-2.5'' 369 × 1661 146.8 220.2 73.4 117.4 0.226 118 244 10.6 13.4
1465-4'' 369 × 1661 146.8 220.2 73.4 117.4 0.226 118 244 10.6 13.4
1465-4''-4'' 359 × 1850 146.8 220.2 73.4 117.4 0.239 111 231 11.2 14.0
1652-2.5'' 428 × 1325 150.1 225.2 75.1 120.1 0.243 109 227 11.3 13.2
1652-4'' 428 × 1325 150.1 225.2 75.1 120.1 0.243 109 227 11.3 13.2
1665-2.5'' 428 × 1668 191.7 287.6 95.9 153.4 0.306 87 180 13.8 15.9
1665-4'' 428 × 1668 191.7 287.6 95.9 153.4 0.306 87 180 13.8 15.9
1665-4''-4'' 418 × 1877 191.7 287.6 95.9 153.4 0.328 81 168 14.9 16.8
1836-4'' 465 × 920 118.1 177.2 59.1 94.5 0.199 134 277 9.0 11.0
1853-4'' 465 × 1350 186.5 279.8 93.3 149.2 0.292 91 189 14.0 17.0
1865-4'' 465 × 1655 235.0 352.5 117.5 188.0 0.292 91 189 16.0 20.0
1865-4''-4'' 465 × 1873 235.0 352.5 117.5 188.0 0.405 66 136 18.0 22.0
2069-4'' 512 × 1770 307.0 460.5 153.5 245.6 0.464 57 119 20.0 27.0
2069-4''-4'' 512 × 1955 307.0 460.5 153.5 245.6 0.513 52 107 22.0 29.0
2136-4'' 543 × 940 164.4 246.6 82.2 131.5 0.278 96 198 13.0 17.0
2153-4'' 543 × 1370 257.9 386.9 129.0 206.3 0.404 66 136 18.0 22.0
2162-4'' 543 × 1600 307.8 461.7 153.9 246.2 0.472 56 117 21.0 27.0
2162-4''-4'' 543 × 1750 307.8 461.7 153.9 246.2 0.516 52 107 23.0 29.0
2465-4''-4'' 614 × 1920 409.4 614.1 204.7 327.5 0.724 37 76 32.0 39.0
2472-4'' 614 × 1884 460.5 690.8 230.3 368.4 0.711 37 77 35.0 41.0
2472-4''-4'' 614 × 2080 460.5 690.8 230.3 368.4 0.785 34 70 37.0 43.0
3065-4''-4'' 765 ×1855 616.4 924.6 308.2 493.1 1.09 23 48 49.0 54.0
3072-4'' 765 × 1844 696.1 1044.2 348.1 556.9 1.08 23 48 56.0 55.0
3072-4''-4'' 765 × 2035 696.1 1044.2 348.1 556.9 1.19 21 44 58.0 57.0
3065-6''-6'' 765 × 2060 616.4 924.6 308.2 493.1 1.21 21 43 57.0 61.0
3072-6''-6'' 765 × 2240 718.9 1078.4 359.5 575.1 1.32 19 40 65.0 64.0
3665-4''-4'' 909 × 1910 860.0 1290.0 430.0 688.0 1.6 16 33 63.0 78.0
3672-4''-4'' 909 × 2090 969.2 1453.8 484.6 775.4 1.74 14 30 69.0 84.0
3665-6''-6'' 909 × 1980 860.0 1290.0 430.0 688.0 1.66 15 31 68.0 83.0
3672-6''-6'' 909 × 2160 969.2 1453.8 484.6 775.4 1.8 14 29 74.0 89.0
4065-4''-4'' 1000 × 1950 1087.1 1630.7 543.6 869.7 1.95 13 27 83.0 97.0
4065-6''-6'' 1000 × 2040 1087.1 1630.7 543.6 869.7 2.05 12 25 88.0 102.0
4079-4''-4'' 1000 × 2310 1257.5 1886.3 628.8 1006.0 2.31 11 23 100.0 113.0
4079-6''-6'' 1000 × 2360 1257.5 1886.3 628.8 1006.0 2.36 11 22 105.0 118.0
4272-6''-6'' 1070 × 2200 1387.5 2081.3 693.8 1110.0 2.52 10 21 96.0 112.0
4872-6''-6'' 1217 × 2260 1751.3 2627.0 875.7 1401.0 3.37 7 15 122.0 137.0
4894-6''-6'' 1217 × 2400 1910.0 2865.0 955.0 1528.0 3.58 7 15 151.0 173.0
6079-6''-6'' 1500 × 2425 3011.5 4517.3 1505.8 2409.2 5.47 5 10 197.0 227.0
6367-6''-6'' 1609 × 2110 2629.8 3944.7 1314.9 2103.8 5.58 5 9 194.0 223.0
6386-6''-6'' 1609 × 2460 3424.5 5136.8 1712.3 2739.6 6.4 4 8 220.0 265.0
7279-6''-6'' 1800 × 2605 4610.3 6915.5 2305.2 3688.2 8.5 3 6 310.0 407.0

 

 

 

What kinds of filter media can be filled into FRP tanks?

 

Quartz Sand for water treatment

Quartz sand

This is usually the first step, primarily used to remove suspended solids, colloids, sediments, and rust from the raw water.
Manganese Sand

Natural manganese sand

Although nominally the second step in the process, it is generally used together with quartz sand and is primarily used to remove iron and manganese ions from raw water.
activated carbon for water treatment

Activated carbon

This is the third stage of the process, primarily used to remove color and odor from the water, and to adsorb organic matter, bacteria, microorganisms, colloidal particles, and metal ions.
Weak Acid Cation Exchange Resin

Ion exchange resins

These are not frequently used for general filtration purposes, but are primarily used in water softening processes. They can remove calcium and magnesium ions from raw water, thereby reducing water hardness.

 

 

 

Production Process of FRP Vessel

 

 

Step1: Inner Liner Production

The production begins with a seamless polyethylene (PE) inner liner, formed through rotational molding.
This one-piece liner creates a smooth internal surface, ensuring excellent corrosion resistance and completely eliminating leakage risks caused by welding or joints.

Inner Liner Production
Filament Winding & Structural Reinforcement

Step2: Filament Winding & Structural Reinforcement

After liner forming, the tank enters the automated filament winding stage.

Using PLC-controlled computer-assisted winding machines, continuous fiberglass rovings are precisely wound onto a rotating mold.
This process allows:

  • High fiber content ratio
  • Accurate fiber orientation control
  • Uniform wall thickness distribution

The filament winding structure provides high tensile strength and an excellent strength-to-weight ratio, making the tank suitable for pressure vessels and cylindrical chemical storage applications.

Step3: Thermal Curing

The wound tank is then transferred to a controlled temperature curing environment.

During this stage:

  • Epoxy or polyester resin fully cross-links
  • Fiberglass layers are permanently bonded
  • Structural stability and pressure resistance are achieved

The optimized curing process enables the FRP tank to withstand working pressures up to 10.5 kg/cm² without structural damage or deformation.

Thermal Curing
Opening Machining & Assembly

Step4: Opening Machining & Assembly

Once cured, precision machining is performed to create top and/or side openings according to design requirements.

Threaded inserts or flange connections are installed, followed by:

  • Valve interfaces
  • Distributors (if required)
  • Base assembly

All components are fitted to ensure airtight sealing and mechanical reliability.

Step5: Hydrostatic Pressure Testing

Every FRP tank undergoes a hydrostatic pressure test before delivery.

The test verifies:

  • Pressure resistance
  • Structural integrity
  • Leak-free performance

Only tanks that pass the pressure test are approved for final packaging.

Hydrostatic Pressure Testing
Packaging

Step6: Packaging

After testing, each tank is cleaned, inspected, and packed using export-grade protective materials.

Standard packaging includes:

  • Protective film and foam
  • Carton or palletized packaging
  • Reinforced strapping for safe transportation

This ensures the FRP tank arrives in perfect condition, ready for installation.

 

 

 

FRP Vessel core process: Filament winding process

 

Fiber winding production process diagram

Filament winding is an open molding process automatically controlled by a PLC, utilizing a rotating mold made of FRP (fiber-reinforced polymer). This process simultaneously creates a smooth inner surface and a uniform, dense outer layer, ensuring consistency in both the strength and appearance of the finished product.

Through automated control, the filament winding process precisely controls the fiber laying angle and distribution, resulting in high-strength, lightweight, and stable composite material structures. Compared to traditional molding methods, it has a higher fiber content, significantly improving the product's mechanical properties.

This process is particularly suitable for manufacturing hollow cylindrical products such as pressure vessels, chemical storage tanks, and water treatment equipment tanks. The finished products possess extremely high tensile strength and pressure resistance, capable of stably withstanding an internal pressure of 10.5 kg/cm² without structural damage.

Furthermore, filament-wound pressure vessels exhibit excellent hydraulic performance and complete corrosion resistance, making them ideal for long-term use in water treatment, chemical, and corrosive media environments.

 

 

 

FRP Tank quality inspection process

 

1.2 times water pressure test

 

  • Testing standard: Each FRP storage tank must undergo a hydrostatic pressure test before leaving the factory.
  • Testing requirements: Test pressure of 1.2 times or more; pressure rise rate of 0.4 MPa/s.
  • Required test results: No leakage/seepage from the FRP storage tank.
Hydrostatic pressure test
Fatigue test

100,000 fatigue tests

 

Testing Standards:

8”–10”: One tank is tested for every 1000 tanks;

12”–16”: One tank is tested for every 750 tanks;

18”–24”: One tank is tested for every 400 tanks;

Greater than 30”: One tank is tested for every 300 tanks.

Testing Requirements:

Test pressure is 1.1 times the working pressure;

Pressure rise rate is 6–16 times/minute;

100,000 fatigue tests are conducted to ensure the durability of the tank.

Test Result Requirement: No leakage in the FRP tank.

Exceeded the pressure test limit more than 4 times

 

Testing Standards:

8”–10”: One tank tested for every 600 tanks;

12”–16”: One tank tested for every 400 tanks;

18”–24”: One tank tested for every 250 tanks;

Greater than 30”: One tank tested for every 200 tanks.

Testing Requirements:

Test pressure is 4 times the working pressure;

Pressure rise rate is 0.4 MPa/s.

Required Test Results: No leakage in the FRP tanks.

Burst pressure test

 

 

 

Application areas

 

 

 

 

Packing

 

Note: FRP tanks should be stored in their original packaging before installation. Do not unpack them before installation.

 

small model FRP vessel packing method
small model FRP vessel packing method
large model FRP vessel packing method
large model FRP vessel packing method

 

 

 

Transportation and installation

 

Loading and unloading method

 

Precautions

 

 

 

Why choose INK-BLUE to buy your FRP tanks?

 

INK-BLUE factory

Xi'an Ink-blue Environmental Protection Technology Co., Ltd.

Xi'an Ink-blue Environmental Protection Technology Co., Ltd. is a comprehensive supplier of water treatment equipment integrating design, production, sales, and installation. The product line includes a complete set of water treatment systems, RO membranes, membrane housings, FRP pressure vessels, filter elements, filter cartridge housings, etc. Ink-blue Environmental Protection Technology has a team of engineers who can design and provide customers with targeted water treatment solutions based on actual conditions. Of course, we can also manufacture products according to customers' drawings or samples.

Our customers are worldwide, mainly in the Middle East, Asia, Africa and Europe. The business scope covers various industries such as drinking water production and treatment, sewage treatment, seawater desalination, medical, pharmaceutical, food, beverage, chemical, agricultural irrigation, etc.

 
 
 

Team composition

We have a team of engineers who can tailor water treatment solutions for customers. On-site installation & technical guidance services are also available. (for large projects)

 
 

OEM design

We can customize products and LOGO and produce products according to the drawings provided by customers, which is conducive to customers strengthening their brand effect.

 
 

Stable delivery

The on-time delivery rate is more than 90%, ensuring the customer's market plan and sales cycle.

 
 

Warranty and after-sales

All products provide a two-year warranty and lifetime after-sales service to help customers open up the market without worries.

 

 

Certificate Display

 

ASME

ASME

CE

CE

NSF-Ink-blue

NSF

Test report

Test report

ISO 9001 certification

ISO 9001

QMS certification

QMS

 

 

Procurement Information

 

 

 

Frequently Asked Questions about Purchasing FRP Vessels

 

Q: How do I choose the right model?

A: FRP tank models are globally standardized. If you're just replacing an existing tank, simply find the current model number on the tank's label. If you're purchasing a new tank and don't know which to buy, just tell me your required flow rate and opening size.

Q: Do you have NSF certification?

A: Yes, all of our FRP vessels are NSF certified. You can inquire and purchase with confidence.

Q: What accessories are included with an FRP vessel?

  • A standard tank includes the tank itself, as well as the openings and base.
  • A complete system should also include core components such as a water distributor, an automatic valve, and a central pipe, which are not included by default. If you require these components, please specify this when requesting a quote.

Q: Do you have technical drawings?

A: We have corresponding technical specifications and drawings for virtually all models. Ink-Blue Environmental Protection will send you the technical drawings along with the quotation.

Q: What is your minimum order quantity (MOQ)?

  • For sizes under 16 inches: 50 pieces
  • For sizes 16-24 inches: 20 pieces
  • For sizes 24-36 inches: 10 pieces
  • For sizes over 36 inches: 5 pieces

Q: If I place a large order, can I get free samples?

A: We will charge a sample fee first and then deduct the sample fee from the bulk order later, which is equivalent to the samples being free.

 

As one of the most professional water tank manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to wholesale water tank for sale here from our factory. Vertical Inline Multistage Centrifugal Pump, Centrifugal Vertical Multistage Pump

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