Pressure - Temperature Ratings - Siemens SITRANS F Series Operating Instructions Manual

Technical data

11.9 Pressure - temperature ratings

Liquids of fluid group 1
● Pipelines according to Article 4 (a) (ii) First dash
Figure 11-3
Liquids of fluid group 2
● Pipelines according to Article 4 (a) (ii) Second dash
Figure 11-4
11.9 Pressure - temperature ratings
Pressure - temperature ratings are determined by process connection material and applicable
standards. The tables below detail the allowed maximum process pressure for sensor variants
with stainless steel and Hastelloy measuring tubes.
With two major exceptions, the pressure rating of the flow sensors is independent of the
process medium temperature. Design rules for flange connections in both the EN1092-1 and
ASME B16.5 standards dictate pressure derating with increasing temperature. The charts
below show the effect of process medium temperature on the pressure ratings for the flanges
within the product program.
116
PS [bar]
1000
500
100
Article 3
Paragraph 3
10
1
0,5
25
0,1 1 10
Diagram 3
PS [bar]
1000
500
100
Article 3
Paragraph 3
10
1
0,5
0,1 1 10
Diagram 4
III
PS = 500
II
PS = 10
I
PS = 0,5
4000
100 1000 10000 DN
II
PS = 500
I
PS = 10
PS = 0,5
200
100 1000 10000 DN
Operating Instructions, 01/2019, A5E44036384-AB
SITRANS FC310