- Overview
- Facts
- Process
- Installation Guide
- Specifications
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Stainless Steel Water Tank
Conlex has been manufacturing customized industrial tanks for over 20 years, including stainless steel water tanks. Through years of experience, we have honed the fabrication process of custom tanks and can build the right stainless steel water tank for your next project. From the design cycle through the installation of the stainless steel water tank, you can count on Aquastore’s team of professionals to be by your side every step of the way and provide timely and accurate project completion:
Our stainless steel water tanks almost never need costly maintenance such as repainting and our interior coatings provide superior resistance to corrosion and abrasion. We have a proven track record for building industrial tanks of all kinds. Advantages of our stainless steel water tanks:
Cost Effective:
With real life cycle savings.
Speed of assembly:
Less construction time compared to competitive tanks.
Very Low Maintenance:
Best of all, their performance is dependable, with minimal maintenance costs, and associated down time. |
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| Stainless Steel Grade 304 |
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| Background |
Grade 304 is the standard “18/8”; it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics. The balanced austenitic structure of Grade 304 enables it to be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepan. For these applications it is common to use special “304DDQ” (Deep Drawing Quality) variants. Grade 304 is readily brake or roll formed into a variety of components for applications in the industrial, architectural, and transportation fields. Grade 304 also has outstanding welding characteristic. Post-weld annealing is not required when welding thin sections.
Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6mm). Grade 304H with its higher carbon content finds application at elevated temperature. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperature. |
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| Key Properties |
| These properties are specified for flat rolled product (plate, sheet, and coil) in ASTM A240/A240M. Similar but not necessary identical properties are specified for other products such as pipe and bar in their respective specifications. |
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| Composition |
| Typical compositional ranges for grade 304 stainless steels are given in table 1. |
| Grade |
|
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
| 304 |
min |
- |
- |
- |
- |
- |
18.0 |
- |
8.0 |
- |
| max |
0.08 |
2.0 |
0.75 |
0.045 |
0.03 |
20.0 |
10.5 |
0.10 |
| 304L |
min |
- |
- |
- |
- |
- |
18.0 |
- |
8.0 |
- |
| max |
0.03 |
2.0 |
0.75 |
0.045 |
0.03 |
20.0 |
12.0 |
0.10 |
| 304H |
min |
0.04 |
- |
- |
- |
- |
18.0 |
- |
8.0 |
- |
| max |
0.10 |
2.0 |
0.75 |
0.045 |
0.03 |
20.0 |
10.5 |
| Table 1. Composition ranges for 304 grade stainless steel |
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| Mechanical Properties |
| Typical mechanical properties for grade 304 stainless steels are given in table 2. |
| Grade |
Tensile Strength |
Yield Strength |
Elongation |
Hardness |
| (Mpa) min |
0.9% Proof |
(% in 50mm) |
Rockwell |
Brinell |
|
(Mpa) Min |
min |
max |
max |
| 304 |
515 |
205 |
40 |
92 |
201 |
| 304L |
485 |
170 |
40 |
92 |
201 |
| 304H |
515 |
205 |
40 |
92 |
201 |
| Table 2. Mechanical properties of 304 grade stainless steel |
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| Physical Properties |
Typical physical properties for annealed grade 304 stainless steels are given in table 3. |
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| Grade |
Density |
Elastic
Modulus |
Mean Coefficient of Thermal
Expansion (μm/m/°C) |
Thermal Conductivity
(W/m.K) |
Specific
Heat |
Electrical
Resistivity |
|
(kg/m³) |
(Gpa) |
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
(J/kg.K) |
(nΩ.m) |
| 304/L/H |
8000 |
193 |
17.2 |
17.8 |
18.4 |
16.2 |
21.5 |
500 |
720 |
| Table 3. Physical properties of 304 grade stainless steel in the annealed condition |
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| Corrosion Resistance |
| Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C. |
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| Heat Resistance |
| Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C. Continuous use of 304 in the 425- 860°C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 304L is more resistant to carbide precipitation and can be heated into the above temperature range. |
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| Heat Treatment |
| Solution treatment (Annealing) – Heat to 1010-1120°C and cool rapidly. These grades cannot be hardened by thermal treatment. |
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| Welding |
| Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 304 with Grade 308 and 304L with 308L rods or electrodes (and with their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. This is not required for Grade 304L. Grade 321 may also be used as an alternative to 304 if heavy section is required and post-weld heat treatment is not possible. |
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| Machining |
| A “Ugima” improved machinability version of grade 304 is available in bar products. “Ugima” machines significantly better than standard 304 0r 304L, giving higher machining rates and lower tool wear in many operations. |
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| Dual Certification |
| It is common for 304 and 304L to be stocked in “Dual Certified” form, particularly in plate and pipe. These items have chemical and mechanical properties complying with both 304 and 304L specifications. Such dual certified product does not meet 304H specifications and may be unacceptable for high temperature applications. |
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| Applications |
Typical applications include:
- Food processing equipment, particularly in beer brewing, milk processing & wine
- Kitchen benches, sinks, trough, equipment, tanks and appliances
- Chemical containers, including for transport
- Heat Exchangers
- Woven or welded screens for mining, quarrying & water filtration
- Threaded fasteners
- Springs
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| Fabrication Process for Stainless Steel Water Tank |
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| Installation Manual For Deluxe Stainless Steel Water Tank |
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1) |
The tank must be installed on a flat and even surface with a strong support. |
| 2) |
Water outlet and discharge point should use BSPT 304 pipe fitting and other non-ferrous andnon-poisonous product (ABS, PVC & Polypipe). |
| 3) |
Stop-cock should be placed at the end of the outlet for emergency case. |
| 4) |
Overflow point should have tracked-connecter, water hose shall be added if necessary. |
| 5) |
Outlet point shall be fixed with tracked-connector. |
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Discharge point at the centre location of the bottom tank shall be fixed with tracked-connector. |
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Any extra water outlet should be requested before fabrication. No alteration or additional ofwater outlet provided after purchase. |
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All the water pipes connected to the tank openings must be firmly installed to avoid any vibration that resulting rings at the opening loose. |
| 9) |
Discharge point should have pipe and valve in order to discharge any dirty water or sediment fromthe tank. Recommended to discharge regularly. |
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Use 1/4 inch diameter stainless steel bolt and nut to tighten up the top cover. |
| 11) |
This stainless steel tank provided with air vent at the top. |
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The location for tank installation must be far away from chemical materials or liquids. |
| 13) |
Do not use underground source water or contaminated water or chemical for storage. |
| 14) |
Ensure all pipes connected to the tank are well supported and properly alligned. |
| Installation Manual For Deluxe Stainless Steel Water Tank |
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| A) |
Always place water tank on a flat and even surfacewith strong support. |
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| B) |
The tank location must be far away from chemical / toxic substance, air conditioner, flammable materials and cooling towers. |
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| C) |
The water tank not suitable for underground water, contaminated water and as chemical storage. |
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| D) |
Always use BSPT 304 pipe fittings and other non-ferrous & non-poisonous product (ABS, PVC, poly)to connect with water outlet and discharge points. |
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| E) |
Overflow point must be connected with pipe or hose. |
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| F) |
Connect discharge point with ball-valve/stopcock todischarge sediment/dirty water from the water tank. |
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| G) |
Always make sure all water pipes connected to the water tank firmly installed, well supported and properly aligned. |
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| H) |
Ideal for well ventilated surrounding (e.g outside building structures or open space). |
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| I) |
Water pumps (if required) should be connected from distance ofnot less than 3 meter from tank. Piping for such pump connections to tank is recommended to be in "ladder" patternsto disperse adverse effects of violent vibrations caused bypressure generated by pump. |
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| Do |
Don't |
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| Place water tank on a flat and even surface with strong support. |
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| Avoid place water tank on uneven and unstable surface. This to ensure water tank well-balanced and stable. |
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| The tank location must be located far away from chemical, air-conditioner, flammable materials and cooling tower. |
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| Do not place water tank near chemical, air-conditioner, flammable materials and cooling tower to prevent any vapour or heat that could affected the properties of the tank. |
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| Always use SUS 304 pipe fittings, other non-ferrous and non-poisonous (ABS, PVC & polypipe) to connect with water tank's outlet and discharge points. |
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| Never use any ferrous pipe fittings to connect with water tank's outlet and discharge. The ferrous pipe fittings easily can be rusted and corroded. |
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| Overflow point must be connected with pipe or hose. |
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| Do not purposely left overflow without any connection. It is veryhard to detect any malfunction of ball-valve if the overflow notconnected with pipe or hose. |
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| Connect discharge point with ball valve or stopcock to eliminatesediment or dirt from the water tank easily. |
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| Avoid connect discharge point with socket since it is hard to eliminate sediment or dirt by using spanner instead of ball-valveor stopcock. |
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| Always make sure all water pipes connected to the water tankfirmly installed, well-supported and properly alligned. |
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| Avoid connect water tank with pipes that not properly alligned and well-supported, since it is easily leak or burst. |
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| It is recommended to place water tank in the well-ventilatedarea, and easy for accessibility. |
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| Do not place water tank in the tiny area since it has poor airventilation and hard to access for maintenance and service. |
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