Cooling towers: legal requirements for annual maintenance, draining and cleaning.

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Transcription de la présentation:

Cooling towers: legal requirements for annual maintenance, draining and cleaning

Legal requirements Arrêté Dec. 13 th 2004 on preventive maintenance and cleaning –Art. 1, Titre I: Sont consideres comme faissant partie de linstallation:…tour(s) et ses parties internes, echangeur(s), lensemble du circuit deau (canalisations, pompes…) ansi que lappoint deau jusquau dispositif de protection (disconnecteur) –Art. 4, Titre I: Linstallation doit etre concue pour faciliter…la vidange, nettoyage, desinfection.. –Art. 6.1, Titre I: dispositions relatives a lentretien…,nettoyage et desinfection de linstallation: Une entretien adapte est mis en place afin de limiter la proliferation des legionelles dans leau du circuit et sur toutes surfaces de linstallation..ou pourrait se developper un biofilm. Un plan dentretien preventif, de nettoyage et de desinfection visant a maintenir en permanence la concentration de legionelles dans leau a un niveau inferieur a 1,000 UFC/l.

Legal requirements –Art. 6.3: Linstallation de refroidissement est vidangee, nettoyee et desinfectee: Avant la remise en service apres un arret prolonge, En tout etat de cause au moins une fois par an… Loperation comportent: –Vidange du circuit –Nettoyage de elements (tour, bacs canalisations) –Desinfection –Art. 7, Titre I: dans limpossibilite technique ou economique de realiser larret prevu a larticle 6… il devra informer le prefet et lui proposer la mise en oeuvre des mesures compensatoires (imposees par arrete prefectorial)

Legal requirements Ces mesures compensatoires sappliquent sur des circuits pour lesquels lanalyse de risque a été réalisée et les modifications apportées. Dans le cas ou lexploitant se trouve dans limpossibilite technique ou economique de realiser cet arret: –Il informe le prefet et lui propose des mesures compensatoires –Linspection instruit un dossier et verifie de limpossibilite darret –Lexploitant precise propose des mesures de traitement (pouvant etre soumises a une tierce expertise) La description doit porter sur les modalites dinjection des produits chimiques, que le traitement soit injecte en continu ou en chocs repetes. Les resultats anterieurs de concentration en legionelles dans linstallation devront etre analyses et interpretes a cette occasion.

LHC installations and legionnella 11,000 < 500 7, ,000 < ,600 < 500 N.A. < 500

LHC treatment and present problems LHC installations predate the 2004 Arrete and require thorough overhaul to conform to the Arrete. Difficult to improve situation without undertaking important work (example: estimates for the SPS) to reduce the needed quantity of chemicals, Despite severe chemical treatment in past frequent excess values are reached every year (because of these unsolved non-conformities), Increase in quantity of chemical should not be considered as a compensatory measure in these conditions as reject water quality already above legal limits,

What can we do then? A simple and effective compensatory measure for operation beyond 12 months is to go to weekly analysis This would allow the detection of an abnormal growth and its (shock) treatment In case the curative treatment was ineffective during the compensatory measures phase (excess repeated the weeks after) a quick draining and cleaning could be done (3 days) These compensatory measures must be exceptional and cannot become permanent. Otherwise modification of the systems must be studied.