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GRP Water Tank Features
GRP (Glass Reinforced Polyester) water tank features panels that have gone through a compression molding by a high-temperature, high-pressure hydraulic press, and has a heat deflection temperature greater than 200℃, while compression molding enables both insolubility and infusibility. The temperature of the water stored in a GRP water tank does not experience any deterioration (heat aging) in the material itself at room temperature.
Design in various capacities
Panels in various sizes and shapes feature structures that maximize utilization of the capacity and horizontal and vertical installation spaces, thus sufficiently satisfying customer requirements. Use of such a variety of panels enables the installation of l-shaped, c-shaped and square-shaped water tanks, as well.
Superior Sanitation
Conforming to the regulations of the Food Sanitation Act, GRP panels completely block off the light to prevent the proliferation of bacteria and various germs, while the high-temperature molding process allows for a beautiful surface and hardness that promotes a material resistant to corrosion. Also, any raw materials designated as being potentially harmful in generating endocrine disruptors are not used during GRP production, making them harmless to the human body.
Perfect Water Tightness
It possesses perfect water tightness by using special sealing materials with outstanding weatherproof properties and restitution.
Strength & Durability
Advanced GRP complex materials maintain the highest water pressure resistance thanks to high-temperature, high-pressure press molding, and the internal structures of the water tank have applied STS (stainless steel), while the external structures have been processed with hot-dip galvanization for corrosion resistance.
Outstanding Thermal Properties & Condensation Prevention
Three-layered, thermal panels (25 mm, 50 mm), equipped with GRP's own adiabaticity, retain excellent thermal properties.
Excellent Constructability & Transportability
Panels with great dimensional stability reduce the period of construction to enable convenient the transferring or relocation of materials in narrow spaces on site.
High Quality
Hi Tank pursues an optimal system through quality management with strict design standard and reliable structural stress analysis.
A critical aspect in structural analysis is the design according to safety factor at a threshold level.
Serim’s expertise lies in the design of optimal safety factor considering the expected external forcebased on the Physical properties of the GRP material after long-term use of more than 15years.
Since Hi Tank does not take account of the initial value (100%) of the GRP properties but only considers the minimum value (70%) and safety factor while designing, SERIM Hi Tank guarantees long-term durability.
GRP Degradation Process
Physical properties
Designed external force
Water load in the tank,
dead load,
snow load,
wind load,
live load and seismic load
Design standardsDesigned external force > Threshold level ÷ Safety factor
| Item | Guaranteed Load Conditions |
|---|---|
| Earthquake | Horizontal seismic intensity Kh=2/3G |
| Hydrostatic | Water Level(Height in Meters) × |
| pressure | 0.1kgf/cm2(0.01MPa) |
| Snow load | 60kg/m2 |
| Wind load | Below 60m/sec |
| Illumination | Less than 0.1% |
| Water temperature | Cold and hot water is used up to 50℃ |
Best Hygienic Properties
With the use of excellent corrosion-resistant panels, the surface of the tank is uniformly smooth without any moss growth and enables long-term use as the panels inhibit the proliferation of bacteria and other various germs by perfectly blocking all the light from outside.
Materials for Reinforced Components
| Inside | for Liquid part | Stainless Steel [STS] |
|---|---|---|
| for Air part | Plastic or corrosion - resistant material | |
| Outside | Steel + hot galvanizing |
As chlorine gas remains in the air area and this may corrupt the SUS and other metals, it is critical that anti-corrosion materials are selected.
Product with Inferior Hygienic Properties
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When light penetrates in the tank
Moss and microorganism grow
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When general STS bolts are used in the air area
Corrosion occurs due to chloride gas
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Welded type air area of the STS tank
Corrosion occurs due to chloride gas
Advantages of Hi-TANK GRP water tank
Hi-TANK GRP water tank uses convex type panels for the base. The convex type panel is designed that any increase in water pressure closes the bottom panels joints and the joints are sealed with a special rubber sealant. And the combination of convex type panels with a concave type drain panel ensures complete and faster drainage and the drain panel was specially designed to facilitate periodic water tank cleaning and inspection.
Necessity of Cell Antibacterial Function
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Serious contamination by rusting inside Stain water tank
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Water tank installed in places where direct supply of tap water is not available
Bad water condition
Failure to perform regular cleaning
Propagation of bacteria and algae
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Examples of poorly managed tanks
Water tank using only the best material for hygiene improvement
A non-toxic antimicrobial in which a zeolite carrier is substituted with an antibacterial metal (Ag)
Differences from organic antimicrobial
- Stable at high temperature
- No volatility or exudation
- Long-lasting antimicrobial power
Patent registered (Patent No. 0492751)
Results of panel performance evaluation
| Item | Performance standard | Test result | |
|---|---|---|---|
| Mechanical strength | 1) Tensile strength | 60MPa | 86 |
| 2) Flexural strength | Over 80MPa | 191 | |
| 3) Flexural modulus | Over 6000MPa | 13262 | |
| 4) Barcol hardness | Over 30 | 41 | |
| 5) Absorption power | Less than 1% | 0.2 | |
| Exudation of harmful components | 1) Heavy metal | Less than 0.1%ppm | Not detected |
| 2) Consumption of KOn04 | Less than 10ppm | 2.8 | |
| 3) pH | 5.8~8.6 | 7.5 | |
| 4) Phenol | Less than 0.005ppm | Not detected | |
| 5) Evaporation residual oil | Less than 30ppm | 3.2 | |
| Antimicrobial power | 1) Escherichia coli | Over 95% | 99.0% |
| 2) Yellow staphylococcus | Over 95% | 99.0% |
Characteristics of antibacterial GRP panel
GRP with inorganic antibacterial
Excellent mechanical strength with reinforced plastic
Hazardous component leaching test pass
Strong antibacterial effect over 99%
Antimicrobial test photo
Antibacterial test (control sample)
Antibacterial test (Zio tank)Performance standard : Conformed to S mark inspection standard (SF-4811-11) of Korea Chemical Testing and Research Institute.
Pathogenic Escherichia coli and Staphylococcus aureus are harmful bacteria causing food poisoning.
Optimal structural design
With years of expertise in structure design, we provide perfect structure safety.
We performed structure analysis by the Finite Element Method to secure reliability on a reinforcement system, the strength of panels and pursue the optimal design. By inputting all possible factors such as hydrostatic pressure, seismic load, snow load, wind load, etc. We estimated the stress and distortion level. Through intensive reinforcement on the part with maximum stress, we aimed to design the best stable system.
Structure Analysis Flowchart
Stress Analysis of the Panel(FEM)
By modeling the entire system of the basic design, we evaluate the level of stress when inputting loads and find out the part where the maximum stress occur. With repetitive improvement of designing, we establish an optimal system of high reliability.
Long-term Durability Test(Field test)
Generally, there is more than one water depletion and filling up a water tank per day on the average.
Therefore, if the tank is used for 15 years, approximately 4000 times of water circulation would occur and the tank would sustain about 4000 repetitive loads.
Stress Analysis of the Panel(FEM)
By modeling the entire system of the basic design, we evaluate the level of stress when inputting loads and find out the part where the maximum stress occur. With repetitive improvement of designing, we establish an optimal system of high reliability.
Strain Gauge Test
Long-term Durability Test(Field test)
Generally, there is more than one water depletion and filling up a water tank per day on the average.
Therefore, if the tank is used for 15 years, approximately 4000 times of water circulation would occur and the tank would sustain about 4000 repetitive loads.
Before launching new product into the market, Hi Tank undergoes field tests to check for water leakage and other defects by applying the expected repetitive loads of water circulation to two tanks every day and night for about 6months.
Such tests make us possible to guarantee the safety and durability of Hi Tank.
SERIM HI TANK
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01 Air-Vent(ABS)
With PE-mesh insect-guard
02 Water tightness
Maintains perfect water tightness by using sealing tape of PVC foam which is excellent for inhibiting the effects of weathering and for its restorative ability.
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03 Outstanding Thermal Effect
Prevents freezing and dew condensation as it demonstrates outstanding thermal effect due to the inherent thermal resistance of the GRP material and polyurethane heat-insulating materials.
04 Level Adjustable Foundation
Replaces concrete foundation
Allows to make easy and speedy construction
Allows to adjust a very fine tolerance
05 External Ladder
Aluminum
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06 Manhole
Convenient & close structure
Mounted special lock
07 Internal Ladder
UPVC
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08 Lower Water-discharging Panel Structure at the Bottom Area
Uses lowered drainage panel on the bottom so that it can collect and discharge the water.
HI TANK OFFERS
External Reinforcement System.
The External Reinforcement System refers to a system that has been designed to support stress that occurs due to the hydrostatic pressure exerted on the outer part of the tank.
The minimized use of reinforcing materials inside the tank, Hi Tank provides perfect hygiene and convenience of easy cleaning for customers.
External Reinforcement System at 1~3mH
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Inside at 1mH
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Sectional view of the inside at 1mH
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Inside at 2mH
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Sectional view of the inside at 2mH
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Inside at 3mH
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Sectional view of the inside at 3mH
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01 Air-Vent(ABS)
With PE-mesh insect-guard
02 Water tightness
Maintains perfect water tightness by using sealing tape of PVC foam which is excellent for inhibiting the effects of weathering and for its restorative ability.
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03 Outstanding Thermal Effect
Prevents freezing and dew condensation as it demonstrates outstanding thermal effect due to the inherent thermal resistance of the GRP material and polyurethane heat-insulating materials.
04 Level Adjustable Foundation
Replaces concrete foundation
Allows to make easy and speedy construction
Allows to adjust a very fine tolerance
05 External Ladder
Aluminum
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06 Manhole
Convenient & close structure
Mounted special lock
07 Internal Ladder
UPVC
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08 Lower Water-discharging Panel Structure at the Bottom Area
Uses lowered drainage panel on the bottom so that it can collect and discharge the water.
HI TANK OFFERS
Combined Reinforcement System.
Combined reinforcement system means a system designed to support pressure caused by hydrostatic pressure applied inside and outside the tank.
Combined reinforcement system is a system developed for high-level tanks and big tanks.
As a substantial action for preventing corrosion due to chlorine gas, the air area is designed without any internal reinforcing materials.
External Reinforcement System at 3~5mH
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Inside at 3mH
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Sectional view of the inside at 3mH
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Inside at 4mH
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Sectional view of the inside at 4mH
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Inside at 5mH
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Sectional view of the inside at 5mH
Characteristics
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Can be installed in Maximum Capacity of a Same-Sized Place
When installing tanks for different usage in a narrow space such as underground rooms and partition, it can be installed for the maximum capacity.
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Diversification of Usage
By installing partitions, you can use one tank for drinking and the other tank for other purposes(e.g. fire hydrant, etc.)
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Easy Maintenance
As two tanks are installed in one-piece, it is easy to maintain the tank. Even during cleaning, suspension of water supply can be avoided owing to use of compartments.
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Low Price
Compared with installing each tank for a different usage, the entire prices including installation expenses are lower.
Installation Example
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Front view of the partition
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Rear view of the partition
Since partition panels receive repetitive loads from both the front and back, when installing the panels that are under water pressure, we use the same designed panel that are used for the bottom panels.
Also, a compartment tank is structurally safe due to the fact that the bottom part and the ceiling part are mutually connected and fixed onto partition.
Free Capacity Design
The tank is suitable for large-sized underground reservoirs as its structure utilizes horizontal and vertical spaces at the maximum through the use of diverse sizes of panels.
| Allowable height for installation of the tank | Allowable capacity for installation of the tank |
|---|---|
| 1.0~5.0min height | 1~5,000tons (A tank with a capacity exceeding 5,000tons may be installed through individual design) |
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General square type
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L-shape type
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Center-vacant square type
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Rectangular-shape type
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C-shape type
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Rectangular-shape type
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C-shape type
※The corner-usage type system creates maintenance space due to the fact that the tank is installed apart from the pillar, regardless of the location of the pillar.
※When installing the tank through lining-processing with FRP, if the pillar takes the role of a wall, it may cause inferiority in the structure intensity of the body and the reinforcement system.
Panel Composition
It is a base pad, comprising a rotating steel support with adjustable height and upper and lower support plates, of a systematized water tank that fixes the ends of both bases with a connecting rod.
Side Panel Composition Standards by Height
Types and Shapes
Side panel
Bottom panel
Celling panel
Drainage panel / Manhole panel
Technical Help
- To prevent dew condensation in the water tank
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To check the dew condensation in the tank, identify the difference between the inside of water temperature and the outside of tank temperature.
Draw a line vertically at the point and mark the point (A) where the line meets the curve representing the relative humidity inside the tank.
Draw an oblique line to the dew point temperature curve and mark it contact point (B).
Point (B) is the dew point temperature that dew condensation may occur.
- Occurrence of dew condensation
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Dew point temperature < the temperature inside the tank : Dew condensation does not occur.
Dew point temperature > the temperature inside the tank : Dew condensation occurs.
- Handling of dew condensation
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It is important to lower the relative humidity in the tank.
It is important to complement the ventilation/duct system for the size of the tank.
Specifications for Hi Tank
1.Sizes of panels and locations on which they can be affixed
| Category | Panel Dimension | Fitting Specification | No. of Locations | Affixed Location |
|---|---|---|---|---|
| Side Panel | 1000x2000 | up to 200A | 2 | Upper, lower |
| 500x2000 | up to 150A | 2 | Upper, lower | |
| 1000x1300 | up to 125A | 4 | corner | |
| 500x1300 | up to 125A | 2 | Upper, lower | |
| 1000x1000 | up to 100A | 4 | corner | |
| 500x500 | up to 300A | 2 | Whole face | |
| Exclusive Panel | 500x1000 | up to 300A | 1 | Whole face |
Exclusive panels for fitting (500x1000) are flat, pattern-less plates used for designing with freedom when setting the attachment height of water outlet pipes, alimentary canals, etc.
2.Type and Size of the Fittings
Socket-type
| D | D1 | D2 | D3 | |
|---|---|---|---|---|
| 20A | 55 | 33.5 | 21.4 | 38 |
| 25A | 65 | 40 | 30.3 | 46 |
| 30A | 79 | 49 | 39 | 55 |
| 40A | 85 | 55 | 45 | 61 |
| 50A | 98 | 66.5 | 56.7 | 72 |
| 65A | 120 | 84 | 72.2 | 93 |
| 75A | 132 | 97 | 85 | 105 |
| 100A | 170 | 120 | 110 | 127 |
Flange-type
| D1 | D2 | |
|---|---|---|
| 65A | 140 | 175 |
| 80A | 150 | 185 |
| 100A | 175 | 210 |
| 125A | 210 | 250 |
| 150A | 240 | 280 |
| 200A | 290 | 330 |
What is SERIM HI-FOUNDATION?
It is a foundation of a systemized water tank which consists of a steel support with adjustable rotary height, a top and a bottom plate and both ends are fixed as a linkage for each foundation.
Structure Analysis Flowchart
| Description | Concrete Foundation | Adjustable Foundation |
|---|---|---|
| Shape |
|
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| Pad material | Plain concrete+Steel liner | STS pipe +SMC |
| Build | Moulding-concrete pouring-Curing-Mortar plaster-Curing | Bolt assembling |
| Leveling | Poor horizontality (Non-precise standing of skid base) |
Precise horizontality (Precise standing of skid base) |
| Durability(Strength) | Good compression strength, but instabilities for curing, plastering & liner | Standardized Uniform Quality with more than 8times safety ratio (Ready made product) |
| Corrosion resistance | Rust on steel liner / Concrete corrosion | No rust (Anti corrosion material) |
| Pad weight reduction / 300 places | 165,600kg(100%) | 3,600kg(2%) |
| Build time / 500 tons | More than 30days | Less than 3days |
Structural design and stability verification
SERIM HI-FOUNDATION is a proven product that has undergone a field test for a scientific design and compressive strength test by FEM and a 7 meter high water tank.
FEM analysis result
| HI-FOUNDATION generation stress | |
|---|---|
| Stiffener(Steel) |
197kgf/cm2 < 1600kgf/com2 (Allowance rate 8.1 times) |
| Stiffener Plate(SMC) |
17kgf/cm2 < 212kgf/cm2 (Design Margin 12.5 times) |
Field Test
| HI-FOUNDATION generation stress | Base frame strain | Spec |
|---|---|---|
| 7mh | 1.25mm | 10.0mm Below |
| Maximum deformation amount 1.25mm (8 times deformation safety) | ||
SERIM HI-FOUNDATION Prefabricatd Structure
