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Storage Calorifiers




System Engineers Storage Calorifiers offer vast rage for Industrial and Domestic Hot water supply systems. Specially designed Very High efficiency Heat Exchanger provide most Economical solutions. System Engineers Calorifiers would use various different Primary Heating Systems.

Low temperature hot water is the most common means of heating. Flows are usually based on a temperature drop of 11C(from 8271c)

Medium temperature hot water systems are generally designed on a temperature drop 30C (from 12090C).

High temperature hot water systems are generally y designed on a temperature drop of 40C (from 150110C).Another important factor in the selection of primary water heating systems is the working pressure. Where the primary working pressure is greater than the shell design pressure the calorifier must be fitted with a bursting disc sized in accordance with the requirements of BS 853. Primary water pressure drops are generally not greater than 25kPa.

Steams is an ideal medium for water heating. The heat exchangers can be designed to accommodate a wide range of pressures, although most users prefer to have calorifiers operating with pressures below 10 Bar g. Superheated steam can be accommodated and the degree of superheat should always be stated at the enquiry stage.

Thermal oils have the benefit of high temperature combined with low operating pressures. The heat exchangers are generally manufactured from stainless steel, depending on oil type.

At System Engineers, Calorifier vessel is Designed as per ASME code where as Heat Exchanger follows TEMA standards. System Engineers is Certified ISO 9001:2000 company, accordingly a full material trace ability is offered. Third party inspection control can be accommodated. This requirement must be stipulated at the quotation stage.

Commercial Calorifiers

All commercial calorifiers carry a name plate specifying the following:

- Date of Manufacture
- Maximum working pressure, test pressure
- Calorific Capacity

Stainless Steel Shells

Austenitic Stainless Steel SS 304L & 316L is suitable for storage calorifiers, it contains Chromium, Nickel, Molybdenum and has a low carbon content 0.003% to improve corrosion resistance after welding. The passivity and general corrosion resistance of Austenitic stainless steel is excellent but they do suffer from chloride attack.

Good manufacturing techniques and a correct post manufacture treatment to restore the stainless steel to its original properties can reduce the susceptibility but complete corrosion attack can not be prevented.

U-Tube Battery For Calorifier

This is the most common type of heat exchanger used in calorifier manufacturing. High efficiency tubes unaffected by thermal expansion provide extremely high levels of reliability. To ensure a high heat transfer capacity a wide range of multi-pass exchangers are available. Standard bundle arrangements are manufactured from 20mm tube although other diameters are used depending upon the duty requirement. Tubes are generally welded into the tube plates. For tube bundles with straight lengths greater than 1250mm support baffles are fitted as standard. In order to ease disassembly batteries greater than 350mm in diameter are fitted with a tapped hole to accept a lifting eye. In addition runner wheels, collar bolts and starting screws can be supplied. Tubes are available in copper & stainless steel.

 
Primary Flow or Stream Primary Return or Condensate
Secondary Flow Secondary Return
Cold Feed Thermometer
Safety Valve Lifting Eyes * 2
Drain Manhole
   
Thermostat x 2 Vent
Bursting Disc Typical Leg for Steel Vessel
Cradles Other connections available on request


Serial no. Capacity Ltr. Diameter MM Height MM Empty Weight
1 700 800 1600 350
2 1000 850 2000 450
3 1200 900 2000 600
4 1500 900 2500 800
5 2000 1000 2600 1000
6 2500 1100 2600 1200
7 3000 1200 2700 1450
8 3500 1200 3200 1700
9 4000 1200 3600 1850
10 4500 1250 3600 1850
11 5000 1350 3500 2300
12 6000 1450 3600 2600
13 7500 1650 3600 2900
14 9000 1750 3750 34000
15 12500 1850 4500 3900
16 15000 2000 4800 3500

The dimensions shown should be used for general information only and are subject to change. Fully detailed drawings are produced for each order. Weights are approximate and based on 2.7 bar design and 4.0 test vessels.

Capacity Dimensions (mm) Weight (kg)*

Vented Calorifiers are installed with an atmospheric open visit. This serves:

- Release of air when it is displaced from the heated water.
- Free movement of air when the calorifier is filled or drained down.
- Change in volume of stored water when it is heated or allowed to cool down.
- The vent pipe should extend vertically upwards from the calorifier.

Un-vented hot water circulation systems are preferred for building applications. Un-vented systems provide a highly efficient means of storing and distributing water.

Calorifiers must be fitted with the appropriate number of temperature pressure relief valves.

It is recommended to increase the size of the expansion vessel rather than the design pressure of the calorifier.

On indirect systems where a fluid primary working pressure exceeds the secondary design pressure a bursting disc must be fitted to the calorifier. It is extremely important that the discharge from the bursting disc is unrestricted and piped to a safe area.

Sacrificial anodes can be supplied to counteract certain adverse water properties.

On an un-vented system a 20mm expansion relief valve must be fitted to the incoming cold water supply. Isolation valves must not be fitted between his valve and the calorifier.

Pressure reducing valves maintain a constant cold fill supply pressure to the calorifier. This protects if from the cyclic operation of the booster set and any overpressure as the booster pumps charge accumulator vessels.

Adequate thermal insulation is essential to prevent unnecessary heat losses from storage calorifiers which may be standing for many hours at working temperature. Standard factory-fitted insulation consists of 50mm thick fiber-glass mattress closely fitted to the shell and encased in rigid coated mild steel sheets 2.0mm thick.

Nominal density: 95kg/m cu.
Thermal conductivity : 0.04 W/mk

Alternative insulating materials and aluminum or stainless steel cladding are also available.

All systems require an independent high limit thermo sat directly connected to the control device or to an independent shut off device.

- Calorifier access of minimum 450mm size is provided.
- Low Water Level Switch
- We strongly recommend the fitting of a low water cut out device on all calorifiers.
- Temperature gauges complete with pockets.
- Pressure gauges complete with gauge cocks.
- Pressure gauge syphons.