Hot Water Cylinders and Expansion Tanks

Expansion Tanks

ERL-DAC_small

Traditional expansion tanks are used in heating plants in order to limit overpressures which are generated by the liquid's volume variation inside the closed circuit whenever temperature changes. In fact, the air cushion of the expansion tank serves as a “lung” according to a ratio established by Boyle law.

The DAC (Dynamic Air Cushion) system has been designed to solve in a simple, safe and economic way the problems that can occur to the heating plant designer in the following cases:

• Exceptionally high water volume in the plant;
• Limited dimension of the boiler room;
• Very reduced differences between the plant’s min./max.Pressures.

In these cases, the possibility to exploit completely the tank's volume as a water reserve allows to save considerably both in the installation costs and in the management and maintenance ones. The groups of the ERL/DAC series allow to achieve this aim, since the expansion tank’s sizing is not calculated according to the maximum value of water acceptance in the tank (Boyle law), but only according to the total expansion volume of the water contained in the plant. The pressurization level is constantly checked by the electronic control panel according to the min. and max. Pressure set.

Standard version available at 10 bar.

On request, models can be built with pressure higher than 10 bar and with certification in compliance with the most important international standards (TÜV, ASME, etc.).

System components:
The ERL/DAC system is composed of:
• ERL - D series expansion tank, CE certified
• Microprocessor (MCP) control unit, CE certified with built-in compressor

Characteristics:
• EPDM rubber bladder (300 and 500 litre models),
• The 750 to 5000 litre models are equipped with a “full volume” type bladder whose dimensions ensure an almost unlimited duration of the membrane, enabling work with almost no mechanical stress.
• Epoxy powder paint, grey (300 and 500 litre models),
• Solvent-based paint, grey (750 to 5000 litres models).
• 750 to 2000 litre models: version with upper tie rod.
• The 3000 and 5000 litre models are equipped with an upper and lower flange opening.

Reference standard
• Declaration of conformity to essential safety requirements outlined by Directive 97/23/EC (PED).

Performance:
• Working temperature: -10° / +99°C.
• Maximum working pressure: 10 bars
2 years warranty.

ERL-DAC_small
expansion tank

Characteristics:
• Long lasting epoxy powder paint, red.
• Fixed bladder in SBR rubber
• Wall fixing bracket on request

Reference standard
• Declaration of conformity to essential safety requirements outlined by Directive 97/23/EC (PED).

Performance:
• Working temperature: -10° / +99°C.
• Maximum working pressure: 10 bars
• Pre-charging pressure: 1,5 bar
2 years warranty.

ERCE
ac

Characteristics:
• Long lasting epoxy powder paint, red. (Model AC-2: white)
• Fixed bladder in SBR rubber. (Model AC-2: replaceable butyl bladder)
• Wall fixing bracket on request

Reference standard
• Declaration of conformity to essential safety requirements outlined by Directive 97/23/EC (PED). Models AC-2/ER5 are without CE marking.

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expansion tank
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INSTALLATION:
• traditional boilers (wall-hung and/or floor-standing)
• condensing boilers
• solar thermal systems
Wall mounting in vertical or horizontal position.
Wall mounting brackets applied.

REFERENCE STANDARDS
CYLINDER:
Directive PED 97/23/EC – ART. 3.3, without CE marking
Standard EN 12897:2006
INTERNAL GLASSLINING:
DIN 4753
The glasslining treatment makes the cylinder suitable to contain hot water for sanitary use and resistant to corrosive phenomena.

INSULATION:
-Expanded polyurethane without CFC and HCFC

HEAT EXCHANGER:
-fixed single-tube coil
-5 years warranty.

bsh
ac

INSTALLATION:
• traditional boilers (wall-hung and/or floor-standing)
• condensing boilers
• solar thermal systems

sac

REFERENCE STANDARDS
ACCUMULATOR:
-Directive PED 97/23/EC – ART. 3.3, without CE marking
-Standard EN 12897:2006
INTERNAL GLASSLINING:
-DIN 4753
-The glasslining treatment makes the accumulator suitable to contain hot water for sanitary and hygienic use and resistant to corrosive phenomena.

INSULATION:
-Expanded polyurethane
-5 years warranty.

sac

About Us

A.H INTERNATIONAL .is a registered company with Pakistan engineering council which provides domestic, commercial and industrial scale cooling, heating, ventilation, filtration and energy management solutions such as boilers radiators, fan coil units, air handling units, pumps, air conditioners, solar products, air cooled & water cooled screw chillers, scroll chillers, filters, sand filters, swimming pools heating and products and ventilation products.

Address

A.H. International
# 09, St# 37, F-7/1
Islamabad Pakistan
Call us: +92 51 2650226
              +92 51 2652421
Fax us: +92 51 2650720