- PIPECO Pressed Steel Sectional Water Tank constructed with hydraulically pressed flanged panels, conform to BS 1564: 1975
- The steel used in the manufacture of the tank plates, stays and cleats conform to the requirements of BS 4360: 1972 grade 43A or ISO equivalent
FLANGES OF PLATES:
- The tank plates are pressed with a combined double flange at an angle of 45 degree and 90 degree to the face of the plate on four sides
STAYS AND CLEATS:
- The stays and cleats are made of steel angle bar and steel plate
BOLTS, NUTS AND WASHERS:
- Hot Dipped Galvanized steel bolts, nuts and washers for internal and external
- Non-toxic PVC foam to be used for all jointing between tank panel flange
- Panel type or pitched type steel cover supported by trusses 600 x 600 square manhole and 100mm air-vent supplied as standard for each compartment
WATER LEVEL INDICATOR:
- Mechanical Ball Float Type
- Aluminium or HDG Steel ladder for internal and external access
- Hot Dip Galvanized conform to BS 729 or ISO equivalent
- Black Bituminous Coated.
Pressed Steel Sectional Water Tank
BRITISH STANDARD SPECIFICATIONS FOR PRESSED STEEL SECTIONAL RECTANGULAR TANKS
This British Standard specifies requirement for pressed steel sectional rectangular tanks, working under a pressure not greater than the static head corresponding to the depth of the tanks, built up of pressed steel plates 1220mm square used to contain cold water, hot water, potable liquids, certain oils and chemicals. Tanks may be constructed as follows:
- with external flanges;
- with internal bottom flanges, external side and end flanges.
Two types are specified:
- Type 1. With a combined double flange at an angle of 45° and 90° to the plane of the plate on all four sides as illustrated in figure 1. The plates of type 1 tanks are hot pressed complete.
- Type 2. With a single flange at an angle of 90° to the plane of the plate on each of two, three or four sides, depending on its position in the tank. Type 2 tanks are cold pressed as illustrated in figure 2, with the flange corners welded. This standard does not provide for tanks subject to earth or other external pressure other than wind pressure.
For an illustration of a typical tank external flanges see figure 8. For approximate weights and full nominal capacities (without freeboard) of open top tanks see tables 1 to 4.
Tanks can also be assembled with all flanges internal with the addition of other components, but because of the difficulty of assembling and maintaining this type of tank they are not preferred.
All tanks can be supplied with open or closed top. Information on erection and supports is also included.
The titles of the British Standards referred to in this standard are listed on the inside back cover.
Information to be supplied with the enquiry and order. The following information, as appropriate, should be supplied by the purchaser with his enquiry or order.
- Type of tank required (clause 1), type of cover (if any), number and position and type of manhole(s), number of divisions if required.
- Capacity required in litres or dimensions in millimetres in multiples of 1220 mm and whether any provision is to be made for future extension and if any level indicators are required.
- Limiting conditions, if any, as to space and accessibility for erection, and whether the tank will be erected in a building or exposed to the weather and the height above ground level it is to be installed.
- Nature and density of liquid for which the tank is required. If corrosive, particulars to be given. If water, state whether hard or soft. The rate of filling and emptying the tank, head fluctuations and cycles per day.
- Maximum and minimum temperatures and approximate rate of fluctuation and position of heating elements.
- Any special requirements as to jointing material and as to internal and external coating or lagging. NOTE: In the absence of any special requirements one coat of suitable priming paint will be applied to protect the tank during delivery and erection. A minimum of two further coats should be applied after erection.
- Particulars of connections and drilling required and precise location on tank with dimensioned sketches, having regard to possible future requirements.
- Whether external access ladders are required and, if so, particulars to be given.
- Details of any existing or proposed supporting structure and height of bottom of tank above ground level so that the necessary scaffolding arrangements can be made to comply with statutory safety regulations.
- Whether transverse supporting bearers are required and, if so, particulars as to span and end support to be given.
- Whether the tank is to be used for other than a stationary application.
- Whether inspection will be made by the representative of the purchaser at the works of the manufacturer.
- Whether erection is to be carried out by the manufacturer at site; if so, information as to site conditions and accessibility to be given by the purchaser.
For the purpose of this standard cold liquids are defined as those having a temperature not exceeding 38 °C and hot liquids are defined as those having a temperature exceeding 38 °C but less than 100 °C.
In the case of tanks to hold hot liquids, care shall be taken in use to avoid excessive vibration or turbulence. Tanks for temperatures higher than 100 °C should be the subject of mutual arrangement between the purchaser and the manufacturer.
- 5.1 The steel used in the manufacture of the plates, stays, cleats and pads for connections shall conform to the requirements of BS 4360: 1972 grade 43A or BS 1449: Part 1: 1972 material HR 14.
- 5.2 Bolts, studs, nuts and washers shall be made from steel complying with the requirements of BS 4190. Bolts and nuts shall be hexagonal, black finish, screwed ISO metric complying with the requirements of BS 4190, where applicable. Washers shall comply with the requirements of BS 4320: 1968 from ‘F’.
DIMENSIONS OF UNIT PLATES:
The nominal size of unit plates shall be 1200 mm square, the actual overall dimensions depending upon the particular manufacturer of the plates. The size of tanks shall be specified as multiples of the nominal dimension.