Membrane Pressure Devices In Water Supply

Incompressible fluids, as well as water, cannot accumulate or compensate for the loss of pressure by adding in mass, nor accumulate mass by providing higher pressure. This has far–reaching and unfavourable consequences on supplying of consumer, transportation and storage. The problem can be eliminated if a gas under pressure (air, nitrogen, etc) is added to the system.

The same thing is done in closed vessels that contain a gas under pressure in the upper space while the lower space is connected to the system. This operation is an exception from the general rule to the same degree to which a gas, with its changes within a system, provides compensation for the liquid mass.

Problem with standard vessels is that gas becomes more or less dissolved in liquid and then gradually disappears from the system. Thus vessels that allow direct contact between gases and liquids have high maintenance cost and are of very complicated technical design.

Termo–Simax Inženjering with its own membrane pressure vessels in water supply offer solution for this problem.

Compensation membrane vessels are steel devices of suitable construction, as determined by nominal pressure, with a built-in membrane which divides the vessel space into two chambers for gas and liquid respectively, where the first one is used for compensation of the pressure increase and the other one for accumulation of liquid mass. Vessels of this type work under pressure and as such come under the I.P.K. audit (Inspection of steam boilers). The dimensions and volume of these vessels are given in figure 1 (other measures and volumes are available on request).

Nominal pressure may be NP6, 10, 16 bars (other pressures on request). Dimensions of fluid connecting duct can be up to ND5OO (higher on request) according to the function and size of the vessel. Material used is construction steel. Vessel membranes (bladder) are completely pressure-free when in operation and are used for technical and drinking Water, temperature range up to 50°C (other liquids on request). Vessels are delivered together with documentation and are compliant with a standard SRPS EN 13445. Testing is performed using hydraulic pressure without having to take out the membrane. if necessary, membranes (bladders), are replaceable and in terms of basic construction the vessels are standing (vertical).

According to the purpose they are used for Termo–Simax Inženjering delivers membrane pressure vessels in water supply as:

– PUP devices are membrane device for water hammer compensation (surge vessels),
– HFm devices are membrane hydrophor devices.