ORI-PLAST’S ROTATIONAL MOULDED POLYETHYLENE WATER STORAGE TANKS
Rotational Moulding, also called rotomoulding, is a process in which polyethylene (LLDPE) material is heated to melt in a pre-heated mould. The molten material initially forms to a puddle at the bottom of the mould cavity and then the mould is rotated slowly in two perpendicular axes simultaneously resulting the molten material to flow into the mould and stick to the walls and finally give a shape of the tank. The mould continues to rotate even during cooling and helps to maintain an even thickness throughout the tank.
Incase of a two layer tank, the PE material is divided into two parts i.e. black for the external layer and white for internal layer in the ratio of 1.0:0.85/0.90. Once the moulding is completed with the black material, the white material is then added and the process repeated once again to form a second layer.
Ori-Plast’s Polyethylene Water Storage Tanks offer the following exciting features:
  • Made out of rotational grade virgin LLDPE raw material having density around 940.0 kg / m3 and duly stabilized with anti oxidant not exceeding 0.3% by mass.
  • The anti oxidant used is physiologically harmless and selected from list given in IS 10141:1982.
  • Seamless one piece moulded an d light weight.
  • Resistant to stress cracking and contains UV stabilizer (carbon black between 2% - 3%) to withstand longer period of exposure to sunlight without degradation.
  • Odourless and hygienic and hence suitable for storage of potable water.
  • Both leak and corrosion proofs.
  • Being light weight, they are easy to handle and also reduces dead load on structure.
  • Strong and durable – lasts for years without any structural changes or reduction in strength.
  • Versatile in use – can be used for overhead, surface, indoor storage and road transportation.
  • Maintenance free – requires no painting or water proofing.
Ori-Plast’s Water Storage Tanks have the following applications:
  • Ideally suitable for over head installation either on roof tops or on staging in residential and commercial buildings including factories, schools & colleges, hospitals etc.
  • A number of tanks can be jointed together to meet bulk requirement of water.
  • Dead load being less, old metallic tanks can be replaced easily using the same staging.
Dimensions of Cylindrical Vertical Water Storage Tanks as per IS 12701:1996
Sl. No.
Min.Net Capacity upto Effective Height in liters
Overall Diameter Range in mm
Overall Height
Range in mm
Min. Internal Diameter of Man Hole/Hand Hole in mm
Min. Wall and Bottom Thickness in mm
Min. Weight of the Tank (without Lid) in kg.
1
200
650 -     850
490 -      690
265
3.0
7.8
2
300
650 -     850
700 -      900
265
3.0
9.0
3
500
800 -   1140
625 -    1025
370
4.0
18.0
4
700
900 -   1140
800 -    1100
370
4.4
23.0
5
1000
1000 - 1200
1050 -  1350
370
4.5
33.0
6
1500
1080 - 1450
1150 -  1590
370
4.5
47.0
7
3000
1410 - 1800
1640 -  2150
450
8.1
96.0

Dimensions of "Ori-Plast" Vertical Water Storage Tanks

Capacity in liters
Diameter
Height
Diameter of Man Hole 
in inches
in mm
in inches
in mm
in inches
in mm
200
27
686
24
620
11
270
300
28
716
33
830
11
270
500
34
867
37
930
16
400
750
38
970
43
1100
16
400
1000
42
1068
47
1200
16
400
Tips to select right size of water tank:
Considering the recommendations for levels of water supply per head per day by Public Health and Environmental Engineering Organization under Ministry of Urban Development, Govt. of India, New Delhi in their “Manual on Water Supply and Treatment”, we recommend the following sizes of Ori-Plast Water Storage Tanks for over head installations. The under ground reservoir to store municipal / corporation supply and from where the water is to be pumped to the over head / the roof top tank/s, should always be made several time larger than the over head / roof top tank/s.
Type of Towns / Cities
Type of Building
No. of Person
Qty / Head in
liters per day *
Total quantity in
liters per day
No. of Tanks** &  Capacities
Small Towns
Single Storied
5
70.0
350.0
1 x 500
Small Towns
Two Storied
10
70.0
700.0
1 x 750
Medium Towns
Two Storied
10
135.0
1350.0
1 x 1000
Medium Towns
Three Storied
16
135.0
2160.0
2 x 750
Large & Metro Cities
G + 3 (2 flats / floor)
32
150.0
4800.0
3 x 750
Large & Metro Cities
G + 3 (2 flats / floor)
43
150.0
6450.0
3 x 1000
* Reference “Manual on Water Supply and Treatment (3rd. Edition Revised & Updated) of Central Public Health & Environment Engineering Organization Ministry of Urban Development, Govt. of India, New Delhi”
** Recommended Tank capacities take into consideration of minimum idle storage of around 10%
* * * Similar recommendation for larger residential buildings, institutional and industrial needs can be made by us upon request
Installaton & maintainace guidlines