Why would I need a Totally Internally Flanged Tank?

Standard access requirements request a minimum clearance of 500mm around all four sides of the tank for assembly and maintenance purposes. With the TIF design these access requirements are reduced to 50mm on three sides and 500mm on one side. The tank may be positioned up against a wall or column, allowing space for other equipment within the plant room.

What thickness of insulation do you offer?

38mm as standard (0.57w/m2/⁰C), 50mm (0.40w/m2/⁰C) is also available

Totally Internally Flanged Sectional Tank

25mm as standard (0.85w/m2/⁰C), 50mm (0.40w/m2/⁰C) is also available

25mm as standard, 50mm (0.40w/m2/⁰C) and 75mm (0.27w/m2/⁰C) are also available

What space do I need around my tank?

This will depend upon the type and height of tank you require, an approximate guide as follows:

  • IFB under 2m high – 500mm on all 4 sides and 650mm above
  • IFB over 2m high – 1000mm on all 4 sides and 650mm above
  • EFB under 2m high- 500mm on all 4 sides, 650mm underneath and 650mm above
  • EFB over 2m high- 1000mm on all 4 sides, 650mm underneath and 650mm above
  • TIF – 50mm on 3 sides, 500mm on 1 side and 650mm above

Please note the clearance above can be reduced to a minimum of 500mm with the inclusion of a ‘lift off kit’. The clearance around tanks over 2m can be reduced depending on site conditions. Please speak to our technical sales team on +44 (0) 1934 421477 for further information.

What does TIF, IFB and EFB stand for?

They are all acronyms relating to the flanges of our sectional tanks.

  • TIF – Totally Internally Flanged (all internal bolting)
  • IFB – Internally Flanged Base (externally flanged sides)
  • EFB – Externally Flanged Base (externally flanged sides)

Do you have LPCB approval?

Yes, we have approval for both our Hot Press Sectional tanks and Totally Internally Flanged tanks.

What is you maximum height tank?

This is currently 4m for Hot Press Sectional Tanks, 3m for our Totally Internally Flanged tanks and 2.2m One Piece Specials however we are always striving to develop our products and manufacturing methods.

Do you have stock products available?

Yes, we hold a selection of One Piece Tanks with standard insulation recess positions (areas that connections can be fitted within). We currently also stock Hot Press Sectional tanks with externally flanged sides and internally flanged base sized at 1m x 1m x 1m, 1.5m x 1m x 1m and 2m x 1m x 1m, with or without raised valve chambers.

Can I store wholesome / potable water within your tanks?

Yes, Dewey Waters have full WRAS approval and manufacture to British Standards for our full range of one piece and sectional water storage tanks (not including underground).

What’s a Type AB air gap?

This is a non-mechanical backflow prevention arrangement. The water is discharged through an air gap which has at all times an unrestricted spillover to atmosphere. This is required to protect the mains water supply from back siphonage of a category 5 fluid application such as Process, Medical or Grey water recycling systems.

What’s the difference between nominal and actual capacity?

What’s the difference between nominal and actual capacity?

The nominal capacity is the volume of the tank when it is filled to the brim. The actual capacity is the volume contained within the tank up to the maximum working level. This is dependent on the inlet size and air gap selection.