Larco Docil Anglais
Uploaded by
serge RinaudoLarco Docil Anglais
Uploaded by
serge RinaudoA multidisciplinary team devoted to
the Oil and Gas Industry.
Professional skills, from engineering to maintenance :
engineering, manufacturing, installation, operation,
maintenance, control, training...
Petroleum Equipment
11, rue Charles-François Daubigny - CS 10025
95872 BEZONS Cedex - FRANCE
Tél. : (33) 1 39 47 12 22 - Fax : (33) 1 39 47 32 00
E-mail : contact@larco.fr
INOVA COMMUNICATION GRAPHIQUE : 01 30 76 74 24
REFERENCES
More than 30’000 units in operation
BP / CIM / DPA / DYNEFF /
EXXON / RAFFINERIE DU MIDI /
DPC / RUBIS TERMINAL /
SHELL / SSO /
TOTAL / TRAPIL .... DOCIL OVERFILL PROTECTION SYSTEM
Petroleum Equipment
Petroleum Equipment
LEVEL DETECTOR DETECTION ELECTRONIC BOARD
The detection is based on optical technology. The detectors use reflection / refraction of a light ray emitted by a LED. The detection electronic board analyses and posts the various
The receiver’s associated electronics detect any change of the luminance of the returning light. state of the sensors as well as the defects possibly noted on the
An electroluminescence diode (LED) emits a beam of light on the base of the cone. detection chain.
In the absence of liquid, this In the presence of liquid, the HL HHL
open short
ray undergoes a double partial immersion of the circuit circuit
reflection inside the cone optical cone provokes an
and comes to light a immediate change of
photosensitive which direction of the light ray.
detects the The ray is diffused outside
presence of the light ray. the cone and does not reach
the photosensitive anymore.
None Alarme Tank put in safety mode
• 4 LED or indicators
• 2 reference marks A and B
- Detection loop certified SIL2/SIL3 from detector to relay contact • a screw (adjust the impedance of the board
- ATEX approved Distance between the board and the level detector)
- Level alarm setting on site
- 2 separate level alarm on the same flange
- Easy complete and real test without any dismantling
- More than 30,000 detectors in use today
- LPG detector can be maintained without emptying the sphere
- Very high reliability, maintenance free no moving parts
- Response time less than 20 ms
- Precision : better than 1mm
- Continuous Auto check and loop control integrity
THE SENSORS MAINTENANCE TEST
Sensor L1, HL : Liquid is injected through the orifice specifically located at the
High level, first safety level head of the level detector.
(this level should never be reached) The liquid received into the test cups immerses the sensors
• alarm the depot and the operator => Alarm
BLACK GREEN The cups then empty itself slowly into the tank by a small hole
• time-lag stop of the reception L1 (HL) L2 (HHL)
• stop of pumping by the operator pipe located lower than the inlet.
• stop discharge pumps from rail reception
• Stop of the ship pump by the boatman
Test twice a year
Sensor L2 Check if controls are functioning well.
Sensor L2, HHL : HHL
High high level, the ultimate security level This test must be repeated after any tank intervention.
• alarm the depot and the operator In case of major tank works during decennial of a tank
• emergency reception stop is released => dismantle the level detector
automated (except in the case of reception boat
where it is the boatman who stops the pumps Sensor L1 In the effect of failure of the level detector
on a signal sent by walkie talkie or stop HL => reception is possible in a shut off mode
pumping, and the depot closes the valve of the
tank)