18
Pressione di esercizio (bar)
Parametri
Valore pH
Durezza totale
Conduttività totale
< 15
Limite
Alcalinità totale
STD
mg PO
4
/kg
Silice
S/cm
Unità di
misura
Fosfati
Conduttività acida
Frequenza
mg SiO
2
/kg
mg/kg
S/cm
mg CaCO
3
/kg
9 - 12
mg CaCO /kg
3
1000
5
7000
3500
150
30
T - S
T
G
T
S
S
S
Pressione di esercizio (bar)
Parametri
Valore pH
Ossigeno
Anidride carbonica libera
< 15
Limite
Durezza totale
Ferro
mg/litro
Rame
mg O
2
/kg
STD
g/kg
Conduttività totale
g SiO /kg
2
Silice
Unità di
misura
Sostanze oleose
Sostanze organiche
Conduttività acida
Frequenza
S/cm
S/cm
g Cu/kg
g Fe/kg
g CO /kg
2
g O /kg
2
7,5 - 9,5
mg CaCO /kg
3
5
100
200
100
100
1
T - S
T
S
S
S
S
T
Limit values and frequencies of checks recommended
according to Standard UNI - CTI 7550
FEED WATER
OPERATING WATER
FREQUENCY OF THE ANALYSES
The frequency of the analyses depends on the use of the
generator and the quality of the water used; however, it is
advisable to check the pH value, the total hardness and alkalinity
of the feed water and operating water every two days. It is good
practice, especially in variable operating conditions, to monthly
subject a significant sample of the feed water and operating
water to a full analysis.
It is also good practice to visually check the condensate returns
for any highly polluting oily substances (reduction of evaporation
on the surface of the boiler water due to a layer of oil).
WATER PARAMETERS CHECK
(DAILY)
Responsibility
Record
System Manager / Operator
Heating System Instruction Manual
WATER PARAMETERS CHECK
(MONTHLY)
Responsibility
Execution
Record
System Manager / Operator
Specialised company
Heating System Instruction Manual
COMPLETE QUALITY ANALYSIS OF THE BOILER AND
FEED WATERS (Specialised company)
Operating pressure (bar)
Operating pressure (bar)
Parameters
Parameters
pH value
pH value
Total alkalinity
Total hardness
Total conductivity
Silica
Phosphates
Acid conductivity
Limit
Limit
Fr
equency
Fr
equency
Total hardness
Oxygen
Free carbon dioxide
Iron
Copper
Oily substances
Organic substances
Total conductivity
Acid conductivity
Silica
Unit of
measurement
Unit of
measurement
(*) For boilers designed to run in a regime of “Operation without
continuous supervision” for up to 24/72 hours, the frequency of the
tests is equal to the period of exemption.
S = Weekly, in laboratory S/2 (twice-weekly)
T = Each shift
G = Daily
(*)
(*)
