Appendix C - Stormwater Management Plan

                                        SPEL Automatic Alarm/Monitoring System

The SPEL automatic alarm/monitoring system provides a audible warning alarm when the level of the oil in the SPEL separator reaches
approximately 10% of the storage volume under static liquid level conditions. This is a early warning system that is used for spills
or lack of maintenance.
The system comprises of a probe mounted in the main separation chamber which senses when the designed volume of light liquids has
accumulated and sends a signal to the electronic control unit activating a red ‘empty now’ warning light and an audible alarm,


                                                                Safe area      Operation
                            Hazardous area                       Control       The probe is freely suspended in the probe protection tube in
   SPEL seperator                                                 Unit         the separator at the correct level. When the oil-layer or depth
                                                                               of hydrocarbons reaches the predetermined level, the top of
                                                                               the probe will be immersed in the oil, breaking the circuit and
                                                                               activating the alarm. It is a ‘fail-safe’ system providing
                                                                               complete assurance that it is operative. If a fault occurs it will be
                                                                               signalled immediately.

                                                                               Installation
                                                                               Control unit (general positioning)
                                                                               The control unit has been designed to be located indoors and
                                                                               outdoors, within a nonhazardous area. It should be wall mounted
                                                                               and positioned such that the LED display and push switches
                                                                               on the front panel can be readily seen and accessed. The unit
                                                                               can be secured to the wall by using the four mounting holes
                                                                               provided. Included within the control is an intrinsically safe
                                                                               circuit (approved according to ATEX Directive 94/9/EC), to
                                                                               which the probe unit is connected.

                                                                                Cable to control unit   Probe junction box
                                                                                                                     Access shaft
                                                 Maintenance
          When the separator is maintained, lift the probe out of the probe
   protection tube, check it operates the alarm (see under Tests Ref. 10.2)                                         Cable coiled for
                                                                                  Location cap                      adjustment and
        and at the same time wipe oil and contaminants from the probe to                                            testing
                                    prevent a fake alarm after re-inserting.

                                                                                                                    Probe protection tube




                                                                                          Probe




                                                                               Insert probe onsite
                                                                               The probe protection tube is factory fitted and the probe
                                                                               matched to ensure the alarm is activated when the light liquids
                                                                               reach approximately 10% of the storage volume the SPEL
                                                                               separator is designed for.
                                                                               All that is required on site is to undertake the electrical
                                                                               installation in accordance with the instructions provided and
                                                                               lower the probe with the pre-fixed location cap into the probe
                                                                               protection tube. When the cap locates onto the top of the probe
                                                                               protection tube, the probe is suspended at the correct level.




                                                                                                                                                       6