KROHNE OPTIMASS with MFC 05x EN - Manual (Page 11)

Installation and Operating Instructions OPTIMASS 10
1.2.4 Secondary Pressure containment
The OPTIMASS 7000 meters are supplied with secondary pressure containment as standard.
Allowable maximum secondary containment pressures are 63 bar at 20°C or 914 psig at 70°F
If the user suspects that the primary tube has failed, the unit must be depressurised and removed
from service as soon as possible.
Note:
In the 7000 Series there are high pressure feed through seals and ‘O’ rings that might not be
compatible with the process fluid for an extended period if a primary tube fails.
It is important to remove the meter ASAP
It is the user’s responsibility to ensure that the materials used are compatible with this product.
Other ‘O’ ring materials are available on request.
1.2.5 Pressure de-rating
Meter data plates are stamped with maximum pressure rating (at max. operating temperature) of
connection, primary tube or secondary pressure containment (whichever is the lower). Higher
pressures may be possible at lower temperatures.
Titanium Tubes and secondary pressure containment is 63 bar at 20°C or 910 psi at
4°F
De-rated to 40 bar at 150°C or 580 psi at
300°F
The titanium tubes could handle a higher pressure, but where this exceeds the pressure rating, a relief
or bursting disk has to be fitted to the secondary pressure containment. This can be done as a
special. (This is available for meter sizes up to 25 only)
Hastelloy and SS measuring tubes are rated for 50 bar at 20°C or 725 psi at
4°F
De-rated to 40 bar at 100°C or 580 psi at
210°F
Heating Jacket 10 bar at 100°C or 145 psi at
210°F
Pressure Derating
Pressure/Temperature de-rating for Titanium Gr.9
Metric PN 40 & PN63
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
-50 0 50 100 150
Temperature/deg. C
P
ressur
e
in Bar
Secondary Press. Containment 316 L
&
DIN 2501
PN 63 Flange
Secondary Press. Containment 304 L
DIN 2501
PN 40 Flange
DN100 PN40 Flange
DN80 PN63, DN100 PN63
Flange