Air Handling units For hospital environment - .Air Handling units For hospital environment ... Requirements

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Copyright 2009 - FAST SpA

Air Handling units

For hospital environment

FM-H

Copyright 2009 - FAST SpA

- Health directives

- Technical directives/norms

- AHUs FM-H: technical details

Presentation index

Copyright 2009 - FAST SpA

The term legionellosis(legionnaires disease) identifies forms of pulmonary

infection caused by different

species of aerobic bacteria of

the type Legionella (Legionella pneumophila is

the species most dangerous)

Problem of Legionella

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Legionella infections are difficult

to distinguish from other types of

pneumonia

The Legionella (especially in the variant

"legionnaire's disease") is a serious disease, with high

lethality

Problem of Legionella

Copyright 2009 - FAST SpA

Problem of Legionella

Reference 15/12/2011: http://www.eurosurveillance.org/ViewArticle.aspx?Articleid=753

Copyright 2009 - FAST SpA

Problem of Legionella

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Responsibilites

Due to recent incidents that occurred in hospitals with

episodes of deaths, dedicated institute opened a criminalinvestigation against the directors of the hospitals on chargeof negligent injury, wrongful death and violation of the law

626/94 on the protection of workers. It 'clear, however, that

can potentially be called into question all those involved in the

process of design, implementation, testing, maintenance, use

of the system: designers, general contractors, equipment

manufacturers, installers, test technician, maintainer, owner,

manager .

Extract from UNI communication

Problem of Legionella

Copyright 2009 - FAST SpA

All plants that pose a

moderate heating of water

and its spray (hospitals,

nursing homes, rest, hotels,

schools, spas, swimming

pools, ...) are potentially

under the risk

Especially, HOSPITALS

Dangerous environments

Problem of Legionella

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Conditions for the development of Legionella

1 Optimal temperature for growth range from 25 to 42 C (best 37 C)

2 Aerobic (ambient with oxygen) and humid environment

3 Presence of nutrients: biofilms, slag, limestone and iron ions, other

microorganisms

4 Spraying water droplets forming with diameters ranging from 1 to 5

microns

Problem of Legionella

Copyright 2009 - FAST SpA

Mode of transmission

Spread by breathing contaminated water aerosols (main cause of transmission)

Alcohol, Smoking

Sex (men, mainly)

Advanced age

chronic lung disease

Problem of Legionella

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Guidelines for the protection and promotion of health in confined spaces

Scope of the document

Structure of the document

To provide technical guidelines, to promote the

development of initiatives ... on pollution of indoor

environments (IAQ)"

Part 1: introduction

Part 2: prevention for indoor environments

Part 3: strategic lines for actuation of prevention for indoor

environments

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Strategic lines of the risks dell'IAQ (summary)

Carry out a survey on the health of existing buildings

Prepare guidelines for designers and constructors of buildings

Prepare protocols relating to the maintenance

Prepare a reference standard for the protection of health

Verify the effectiveness of taken actions

Guidelines for the protection and promotion of health in confined spaces

Copyright 2009 - FAST SpA

General guidelines

in paragraph 5.2.6 of the guidelines refer directly to the

Guidelines for the prevention and control of legionellosis

to ensure compliance with the hygienic requisites of indoor air,

should refer to the provisions of ENV 12097 ("network of pipelines.

Requirements for components to facilitate maintenance of

networks of pipelines" - January 1997 ")

test procedures for limits in the pipelines should follow the

methodology described in the documentation prepared by NADCA

- National Air Duct Cleaners Association

The maintenance should be logged

Guidelines for the protection and promotion of health in confined spaces

Copyright 2009 - FAST SpA

Guidelines for the prevention and control of legionellosis

Prevention strategies in plant systems (summary)

prevent standing water;

limit the possibility of biological niches by making periodic

cleaning of equipment;

maintain efficient drift eliminators and filters;

avoid the critical temperature of water (25-55 C);

eliminate with proper treatment the biofilm (nourishment for

Legionella)

provide for water treatment;

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Prevention strategies in plant systems (summary)

To program inspections on the installation of air conditioning to

check the status of humidifiers, evaporative cooling towers, the

location of the external sockets and the state of drainage

systems;

To check maintenance schedule and log

To design the air flow system to ensure accessibility for

maintenance operations;

Guidelines for the prevention and control of legionellosis

Copyright 2009 - FAST SpA

Specifications for components (summary)

Guidelines for the prevention and control of legionellosis

Copyright 2009 - FAST SpA

Silencers

- Must have surface finishes such as to limit the nesting of dirt, and to

ensure the ease of cleaning;

- Must be placed at an appropriate distance from humidifiers;

Inlet for Fresh air

- must be sized for speed

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Filters:

- class F7 upstream of UTA;

- class F8 / F9 downstream of the UTA and any silencers;

- class F7 on the fresh air intake;

- must be serviced (cleaning and replacement)

Guidelines for the prevention and control of legionellosis

Specifications for components (summary)

Copyright 2009 - FAST SpA

Heat exchangers:

- cleaning often the heat exchanger;

- Sloping the drain pans

- make the pans with dedicated materials to prevent corrosion.

Adiabatic humidification

- Not suggested

- Checking the quality of water

- Cleaning often the system

Guidelines for the prevention and control of legionellosis

Specifications for components (summary)

Copyright 2009 - FAST SpA

Ducts:

- Compressed air system for cleaning is suggested

Logbook of maintenance

- ordinary and extraordinary maintenance on water systems and air

conditioning systems must be registered.

Guidelines for the prevention and control of legionellosis

Specifications for components (summary)

Copyright 2009 - FAST SpA

Norm UNI CTI 5/716

Abstract

air conditioning systems must be provided of accesses for

technical and hygiene inspections by qualified personnel. Each

control must be registered.

Inspection of tech and hygiene must involve ducts, local and

technical components of the air handling unit

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Allowable limits for the concentration of particulate matter and

bacteria in the canals, for the test methods and limits for

bacterial contamination of components in CTA refers to the

technical documentation NADCA

Checkings, cleaning, disinfection must be carried out according to

a checklist proposed in a table

training of personnel hygiene facilities must be provided:

Category A: hygiene managers

Category B: for simple personal

Norm UNI CTI 5/716

Copyright 2009 - FAST SpA

Guidelines ASHRAE 12-2000

Scope of document

Giving directions to minimize the risk of Legionellosis

associated with water systems, swimming pools, air

conditioning systems, etc..

Abstract

The guideline addresses the problem with a comprehensive

approach is to identify areas characterized by higher critical

plant, consider the application situations (hospitals, hotels,

etc..) And propose intervention methods emphasizing the

aspect of prevention to stop the rise to the chain of

transmission of legionellosis.

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Technical solutions inside FM-H

Problemi diigiene - salute pubblica

Strumenti giuridici enormativi

Progetto FM-H : soluzionetecnica

Attivit di ricerca e sviluppo

FAST

Copyright 2009 - FAST SpA

Range

0 5.000 10.000 15.000 20.000 25.000 30.000 35.000

Portata aria [m3/h]

FM-H 20

FM-H 28

FM-H 35

FM-H 42

FM-H 50

FM-H 57

FM-H 69

FM-H 82

FM-H 105

FM-H 119

FM-H 154

FM-H 194

FM-H 237

FM-H 286

FM-H 342

Mo

dell

o

Velocit frontale sul pacco di

scambio termico [m/s]

2,52

Technical solutions inside FM-H

Technical

solutions

inside FM-H

construction (easy to clean, inspected, materia