H Series | Horizontal Tanks
200 Series
(1.2m inside diameter):
1,000 – 10,000L capacity
300 Series
(1.8m inside diameter):
4,000 – 40,000L capacity
400 Series
(2.6m inside diameter):
13,650 – 100,000L capacity
500 Series
(3.5m inside diameter):
60,000 – 200,000L capacity
600 Series
(4.0m inside diameter):
100,000 – 300,000L capacity
Designed with reference to BS EN 13121. All tank shells carry the SPEL 25 Year Warranty and life expectancy in excess of 50 years.
Different tank shell specifications are available dependent upon tank invert levels, ground conditions and ground water levels. (See Installation Guidance section)
Pipe connections available to accommodate most standard sizes.
Rainwater is directed from the transformer platform to the SPEL DrainGuard tank, here float switches monitor liquid levels in the tank and automatically activate the submersible pumps to remove rainwater once it has accumulated. An electronic capacitance probe senses the presence of oil and stops the pumps, ensuring the oil spill is captured (tanks are sized to 110% of the spill risk). The unit incorporates an anti-syphoning device to ensure hydrocarbons retained within the tank cannot, through static head pressure, pass out of the tank.
The key benefit of the SPEL DrainGuard system is the dramatic reduction of fire risk in the event of a catastrophic oil leak from the transformer. Due to the high operating temperature of transformers and the low flash point of mineral oil, the fire risk is high if oil is left in an open bund, DrainGuard stores this flammable fluid underground.
The system control panel is IP66 rated for external mounting and incorporates the alarm system which will activate in the event of the following:
The digital display on the control panel provides visual information and warnings, there is also volt free (normally closed) contacts available, providing remote indication of alarm/system status. Controls and pumps can be supplied to operate with either 230 volt single phase or 400 volt 3 phase supplies.
The submersible pumps are ATEX rated and sized to suit the required duty. Mechanical oil filled seals ensure long trouble free operation.
SPEL DrainGuard is available in both a tank based system as described above and also as a bund based system as below.
System Operation and Control The SPEL DrainGuard Bund System is a robust and efficient unit to remove bund water from bunded areas whilst safeguarding against the release of hydrocarbons using the latest conductivity controls and technology.
Bunds act as a secondary containment and are used as a second line of defence, preventing oil from reaching the drainage system, but they also collect rainwater which needs to be discharged safely which is where the SPEL DrainGuard system provides the solution.
Bunds should be designed to hold a minimum of 110% of the maximum capacity of the largest transformer or tank, and incorporate a sump at the lowest point which is where the SPEL system will be located. The SPEL system is designed to pump accumulated rainwater from the sump, over the bund wall, to a suitable drain point but will detect accumulations of oil and shut down the pump so as to contain the oil within the bund area.
Whilst this system is simple and cost effective to install, it has a high fire risk should a transformer rupture, this is due to the high operating temperature and low flash point combination which can result in total destruction of the sub station. If this is of concern, please refer to the tank based system on the previous page, where the oil is contained in an underground SPEL tank.
Below are images of both systems, together with the list of benefits to assist in choosing the correct system.
For more information on commissioning and servicing your SPEL DrainGuard System, contact our team:
engineers@spelproducts.co.uk
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