Potable Water Expansion Vessels

 

Fabricated Products offer a complete range of expansion vessels to meet the requirements of most heating systems and for use with potable water.

Design

  • Manufactured in carbon steel with a two or three part weld construction.
  • Pre-pressurised air chamber with synthetic rubber compound bladder
  • Sizes 60 to 1000 litres (except 140 litres) have a replaceable bladder
  • The internal surfaces of the vessel in contact with the water are coated against corrosion
  • External surfaces have a blue durable powder coated finish
  • Suitable for temperatures up to 70°C, resistant to ethylene or propylene glycol mixtures and has low gas permeability
  • Our expansion vessels are all tested according to the Pressure System Directives

How it Works

In a closed hot water circuit, the Water cannot be compressed so any increase in volume, created by an increase in temperature, has to be accommodated by an expansion vessel.

When water is cold, the pre-charge pressure forces the bladder to collapse until the pump is started when the bladder starts to inflate.

As the temperature in the system increases, with the associated increase in pressure and volume, the expanded water enters the bladder creating additional volume and lowering the pressure.

When the temperature decreases, the pre-charge pressure forces the bladder to collapse until the pump is started when the bladder starts to inflate.

As the temperature in the system increases, with the associated increase in pressure and volume, the expanded water enters the bladder creating additional volume and lowering the pressure.

When the temperature decreases, the pre-charge pressure forces the water from the bladder and back into the main water circuit

Potable Water Expansion Vessels
 
Technical Specification
Max. working pressure: 10 bar
Max. operating temperature: 70°C
Factory air pre- charge: 4.0 bar - nitrogen
Replaceable bladder - sizes: 50 litres and larger
except 140 litres size

System water connection thread: BE EN ISO 228 - male parallel
140 litre size: BE EN 10226 - male taper
Materials
Component Material
Shell Carbon Steel
Connections Carbon Steel
Bladder Synthetic rubber compound
Coating Powder epoxy

Technical Data

The expansion vessels are manufactured to meet the requirements of PED 97/23/EC Directive and BS EN 13831: 2007 'Closed expansion vessels with built in bladder for installation in water'.

2 - 35 Litres
Model No.Capacity (lt)ØD (mm)H (mm)Connection (c)Weight (kg)
EXPPOT2 2 132 260 G 3/4 B 1.0
EXPPOT8 8 206 325 G 3/4 B 1.8
EXPPOT12 12 280 310 G 3/4 B 2.4
EXPPOT18 18 280 380 G 3/4 B 2.8
EXPPOT25 25 280 500 G 3/4 B 4.7
EXPPOT35 35 354 455 G 3/4 B 6.6
Potable Water Expansion Vessels - Verticle Range
50 - 1000 Litres
Model No.Capacity (lt)ØD (mm)H (mm)h (mm)Connection (c)Weight (kg)
EXPPOT50 50 409 605 104 G1B 9.5
EXPPOT60 60 409 740 152 G1B 14
EXPPOT80 80 480 730 152 G1B 16
EXPPOT100 100 480 835 152 G1B 19
EXPPOT140 140 480 1015 145 R1 29
EXPPOT200 200 634 970 145 G1 1/4 B 40
EXPPOT300 300 634 1270 145 G1 1/4 BB 54
EXPPOT400 400 740 1245 135 G1 1/4 B 70
EXPPOT500 500 740 1475 135 G1 1/4 B 79
EXPPOT600 600 740 1860 265 G1 1/2 B 103
EXPPOT800 800 740 2325 265 G1 1/2 B 195
EXPPOT1000 1000 740 2604 265 G1 1/2 B 228
CE Marked WRAS Approved
Potable Water Expansion Vessels - Verticle Range
Accessories
EXPKIT8-80 1/2" Sealed System Kit (8-80 Litre)
EXPBKT2 Potable Vessel Mounting Bracket 5-18ltr
EXPBKT3 Potable Vessel Mounting Bracket 25ltr
Air and Dirt Separators Clients 1
Air and Dirt Separators Clients 2
Air and Dirt Separators Clients 3
Air and Dirt Separators Clients 4
Air and Dirt Separators Clients 5
Air and Dirt Separators Clients 6
Air and Dirt Separators Clients 7
Air and Dirt Separators Clients 8