Table of Contents
Advertisement
6.3.6
EXPANSION VESSEL SIZING
The following information is based on an inlet pressure of 3.5 bar. If a different inlet pressure is to be used, please
consult BS6700.
V V = S V * e
0.45
Where:
V V
=
Vessel Volume
S V
=
System Volume
e
=
Coefficient of Expansion
Stored Temp.
Stored Temp.
6.3.7
COEFFICIENT OF EXPANSION OF WATER AT 3.5 BAR INLET PRESSURE
6.4 DE-STRATIFICATION
6.4.1
GENERAL
The De-stratification Pump Kit works by using a pump to circulate water from the top of the vessel to the bottom of the
vessel. This action ensures that the water held in the unit is maintained at a consistent temperature throughout. By
achieving a uniformed stored water temperature of at least 60°C, the risk of any bacterial contamination is virtually
eliminated.
If the LST is to be installed alongside a circulating water heater then a De-stratification pump may not be required due to
the high turbulent flow created by the matched primary shunt pump supplied.
Systems that have a building loop incorporated onto the vessel may not require a De-stratification kit, as the circulation
around the building from the top of the vessel back to the bottom should provide sufficient mixing.
6.4.2
REQUIREMENTS
Lochinvar has developed this kit to meet the stringent recommendations of both the HSE Approved Code of Practice L8
and Department of Health Memorandum HTM 04-01 relating to the control of legionella. For full compliance, a timer
should be used to operate the pump for a period of at least 1 hour each day.
(See Table 5.1)
30
35
C
e
0.005
0.006
0.008
65
70
C
e
0.020
0.023
0.026
40
45
50
55
0.010
0.012
0.015
75
80
82
85
0.030
0.031
0.033
60
0.017
90
0.037
13
Advertisement
Table of Contents
