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Design details and sizing are site specific, inline with catchment areas, and oil storage requirements.
Any refuelling areas including:
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.
Fuel/oil separators are frequently installed and forgotten about, and, if maintenance is remembered, the conventional way of emptying the complete contents from a separator involves large volumes of waste water. To save some costs, emptying contractors may try sucking pollutants from the surface only, this cannot guarantee a satisfactory job and still requires the removal of large amounts of waste water.
With the SPEL Econoskim® System, the light liquids/hydrocarbons are automatically skimmed from the oil separator to a separate SPEL Tankstor containment tank. The light liquid pollutants have a minimum of water volume and therefore the emptying contractor’s disposal costs are dramatically reduced as a single pollutant is easier to dispose of and as the containment tank has a large storage capacity, ensuring less frequent and expensive contractor visits.
Not only is the SPEL Econoskim system brilliant at removing oil from the chosen separator for easier and cheaper maintenance, due to the SPEL Econoskim system working 24/7, it maintains the separator at peak performance, ensuring the separator is always ready, might a large oil pollution incident occur. This is especially important where oil pollutant levels are high on sites such as railway maintenance depots, airport taxiways and fire training grounds.
1. When the SPEL constant monitoring system detects the level of fuel/oil pollutants has reached the pre-determined volume, the skimmers are brought into operation, transferring these pollutants from the SPEL separator to the SPEL Tankstor® containment tank. When the transference of light liquid pollutants has been completed, the system automatically stops the skimming process and re-sets.
2. During the skimming cycle a small amount of water is transferred from the SPEL separator into the SPEL Tankstor® containment tank. In order to maximise the capacity of the SPEL Tankstor® containment tank for pollutants, accumulated water is automatically transferred back to the SPEL separator.
3. The process repeats automatically every time pollutants reach the pre-determined volume. When the SPEL Tankstor® containment tank is 90% full, the SPEL constant monitoring system signals ‘EMPTY NOW’ with an audible and visual alarm.
The system comprises pivoting suction booms inside the separator with floats that rise and fall with the liquid level and skims the oil/hydrocarbons at a constant depth, keeping the oil level in the separator to a minimum. This gives the separator more storage capacity in a spill and keeps the separator oil level continually maintained.
Constructed in stainless steel, the suction booms inside the SPEL Separator are linked through a low friction pivoting assembly (no flexible hoses) via interconnecting pipework to the adjacent controls and pump for transferring the hydrocarbon pollutants to the SPEL Tankstor® containment tank.
The high percentage of light liquids and low water content in the SPEL Tankstor containment tank enhances the value of the waste which is reflected in a lower, or even nominal cost for its removal and disposal.
It can be an advantage to install the SPEL Tankstor® containment tank away from the SPEL Separator. This may be essential to facilitate emptying without disrupting normal activity such as aircraft movements on airport aprons.
SPEL Separator & Econoskim systems can be configured in a number of ways to suit site conditions as shown. The SPEL Separator can be installed above or below ground and the containment tank can also be installed above or below ground, in vertical or horizontal format. Both the SPEL Separator and SPEL Tankstor containment system can be supplied with the optional secondary containment (double skin).
The above ground SPEL fuel/oil separators can incorporate secondary containment and are mounted on galvanised steel adjustable cradles. Pipework and kiosks can be frost protected. Optional steel access platforms are galvanised and can incorporate access ladder, handrails, and lifting hoist for servicing the coalescer units. The containment tank is filament wound in GRP again, available with secondary containment, optional extra GRP access ladder and safety cage.
Usually the application for an Econoskim system is where fuel/oil is the major pollutant on a large scale eg. Railway refuelling depots. In such cases a bypass would not be suitable, therefore, a SPEL Puraceptor full retention separator is generally used.
However, if a large SPEL Stormceptor by-pass separator is collecting large quantities of oil and other hydrocarbons, an Econoskim system could be incorporated to skim off retained oil and transfer to an above ground tank. This would not only save the increasingly expensive maintenance costs of removing and disposing oil, but will also keep the separator functioning at peak performance 24/7.
SPEL Puraceptor® two chamber separators meet the requirements of the European Standard BS EN 858-1.
SPEL Puraceptor® two chamber separators could be sized in accordance with the BS EN 858-2 formula with the density fd = 1.5 or 2.0 and the impediment factor fx = 4 where pumping. However, the following guidelines are recommended dependent upon the specific site conditions where both wastewater and rainwater are pumped.
Warning: You should not expect separators to always perform within these limits under field conditions. Regular maintenance is essential and general ‘good housekeeping’ pollution prevention measures taken on site.
NOTE: A dual pumping system with duty for wastewater flows and assist for rainwater flows are preferred. The pumps must be low shear and non-emulsifying.
| SPEL Puraceptor* Model | NS BS EN 858-1 | Max. Wastewater Constant Flow Rate | Rainwater Max. l/sec (Assist Pump)* | |||
| l/sec (Duty Pump) | ||||||
| Oil Concentration: | ||||||
| 5 – 50 ml/l | 50-100 ml/l | |||||
| Density fd: | ||||||
| 2.0 | 1.5 | 2.0 | 1.5 | |||
| P025/2CSC | 25 | 1.8 | 2.5 | 1.12 | 1.25 | 5 |
| P030/2CSC | 30 | 2.1 | 3 | 1.35 | 1.5 | 6 |
| P035/2CSC | 35 | 2.5 | 3.5 | 1.58 | 1.75 | 7 |
| P040/2CSC | 40 | 2.85 | 4 | 1.8 | 2 | 8 |
| P050/2CSC | 50 | 3.6 | 5 | 2.25 | 2.5 | 10 |
| P065/2CSC | 65 | 4.68 | 6.5 | 2.93 | 3.25 | 13 |
| P080/2CSC | 80 | 5.7 | 8 | 3.6 | 4 | 16 |
*It is preferable where flows are attenuated in a chamber prior to pumping to the SPEL Puraceptor®, the assist pump cuts out before any accumulated hydrocarbons on the surface reach this pump. These hydrocarbons can be sucked out during the periodic desludging of the separator.
The performance of the SPEL Puraceptor® separator + Econoskim® light liquid skimming and separate containment system has been monitored over an extended period at railway fuelling/maintenance depots. The monitoring proved the system to be effective at treating and discharging into the foul sewer system within the PPG3 Class 2 limit for hydrocarbons at 100mg/litre. Results were between 10 and 47 mg/litre with an average around 30mg/litre.
Lancaster Road
Shrewsbury
Shropshire
SY1 3NQ, UK
