background title Sample 1
All duct work, supply and return, must be properly sized for the design air flow
requirements of the equipment. Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing- All duct work or portions thereof not in the
conditioned space should be properly insulated in order to both conserve energy and
prevent condensation or moisture damage. Refer to Table 10 for maximum static
pressure available for duct design. Design the duct work wowing to methods given by
the Air Conditioning Contractors of America (ACCA). When duct runs through
unheated spaces, it should be insulated with a minimum of one inch of insulation. Use
insulation with a vapor barrier on the outside of the insulation.
background title Esempio 1
Tutti i condotti di processo, di alimentazione e di ritorno, devono essere dimensionati
conformemente ai requisiti di progetto per il flusso d’aria dell’apparato. Una guida
eccellente per un corretto dimensionamento dei condotti è offerta da Air Conditioning
Contractors of America (ACCA). Tutti i condotti per l’aria o porzioni di condotto situati
all’esterno dell’ambiente condizionato, devono essere adeguatamente isolati per
favorire il risparmio energetico e per prevenire danni derivati da formazione di
condensa ed umidità. Fare riferimento alla Tabella 10 per ottenere i massimi valori di
pressione statica applicabile sul progetto dei condotti. Progettare i condotti per l’aria in
conformità con i metodi definiti da Air Conditioning Contractors of America (ACCA).
Qualora i condotti passino attraverso volumi non riscaldati, dovranno essere isolati
con uno spessore minimo di un pollice (25,4 mm) di isolante. Utilizzare isolamento con
barriera di vapore sul lato esterno.
background title Sample 2
All bolts are to be galvanized or zinc plated steel, grade 5 (ASTM A449). Where nuts
are not accessible, stainless steel press nuts will be used with spring lock washers and
plate washers under the bolt head. All other hardware unless specifically detailed on
the drawing will use plate washers and lock washers.
Any bolted joint on the conductor shall be done following the sequence described
herein: Clean the silvered surfaces which will be bolted together with Scotchbrite or
similar cloth or clean with silver polish. Wipe clean.
Brush or wipe XXXXX XXXXX #28 grease (2006) on all silvered surfaces. Use enough
so that a small amount of excess will be squeezed out when the pieces are bolted
together. Tighten the bolts (1/2-13) to 65-75 ft-lb torque.
background title Esempio 2
Tutti i bulloni devono essere realizzati in acciaio galvanizzato o zincato, di grado 5
(ASTM A449). Nei punti dove i dadi non siano accessibili, è necessario utilizzare dadi
stampati in acciaio inox con rosetta di sicurezza e rondella piana sotto la testa del
bullone. Tutta la restante bulloneria, se non specificatamente definito sul disegno,
dovrà utilizzare rondelle piane e rosette di sicurezza.
Ogni giunzione imbullonata sul conduttore dovrà essere eseguita in base alla seguente
procedura:
Pulire le superfici argentate, che dovranno essere unite tramite bulloni, con
Scotchbrite o panno simile oppure utilizzare un detergente specifico per argento.
Quindi strofinare.
Applicare un velo di grasso XXXXX XXXXX #28 (2006) su tutte le superfici
argentate, utilizzando una spazzola o un panno. Applicare una quantità sufficiente a
permettere che una parte del grasso venga strizzata fuori dai bordi quando le superfici
saranno imbullonate insieme.
Serrare i bulloni (1/2-13) con una coppia di 65-75 ft-lb (9-10.4 kg-mt)(88-102
Nw-mt).
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