Hydrostatic Testing - Siemens SITRANS FC430 Operating Instructions Manual

Installing/mounting
4.2 Installation instructions
4.2.2.5

Hydrostatic testing

The flowmeter is pressure-tested before delivery to 1.5 times the rated working pressure of
the sensor.
● In the case of process connections pressure-rated less than 100 bar, the connection is the
limiting component.
● In the case of process connections pressure-rated above 100 bar (stainless steel sensors)
or above 160 bar (Hastelloy sensors), the sensor is the limiting component.
In all cases the maximum allowed hydrostatic test pressure (MATP) of the flowmeter is 1.5
times the marked MAWP (PS) at 20 °C.
Pressure test of a completed flow system with piping and other components can be done at
pressures no higher than 1.5 times the marked MAWP (PS) at 20 °C of the lowest rated system
component.
4.2.2.6 Installing with insulation
Insulation is added to pipes and equipment for two reasons:
● To protect personnel from exposure to hot or cold surfaces, thereby preventing burns and
other injuries
● To prevent heat loss into or out of the process, thereby preserving the process temperature
and process medium conditions.
In both cases, insulation can have the unexpected effect of shrouding other attached
components not intended or designed for the process temperatures. When installing an
FCS400 sensor with insulation, observe the following rules:
● Do not cover any part of the transmitter pedestal. The pedestal is designed to separate the
process temperature from the ambient around the DSL or transmitter electronics housing.
● Form a 90° cone around the pedestal, as shown below. (add graphic)
● Allow free movement of air around the electronics housing to allow temperature equalisation
to occur at all times.
Note
The pedestal has sufficient internal separation from the measuring tubes such that if the main
body of the sensor is insulated, the process medium will not be unduly exposed by the cone
around the pedestal.
4.2.2.7 Pressure guard
The sensor enclosure is supplied with two G½" (parallel thread) purge ports. These ports can
for example be used for a pressure guard, which can be connected to an automatic shut off
valve to stop the flow in case of sensor pipe fracture. Because sensor enclosure is rated Ex[d]
for hazardous applications, the purge ports may not be removed from Ex version sensors.
The AISI 304 / EN 1.4301 exterior enclosure is rated to approximately 20 bar static pressure
to contain spilt process media in the event of a tube break. However it is not intended to contain
60
FC430 (From firmware 4.0)
Operating Instructions, 06/2017, A5E39789392-AA