Disassembly; Disassembly Of Primary Elements For Flange Connection (Sandwich Or With End Flanges) And Measuring Systems; Disassembly Of Plug-In Orifices; Disassembly Of Welded Primary Elements - Siemens SITRANS FP 7ME17.8 Operating Instructions Manual

Installing/connecting
5.8

Disassembly

Before disassembly of primary elements, the process has to be stopped. Overpressure has to be avoided.
Furthermore, general information (See chapter 1) has to be observed. The influence of the disassembly of the
primary element on the whole system has to be considered.
For primary elements in compact design with directly mounted transmitter, this has to be separated electronically
and if necessary disassembled.
For all other primary elements the existing differential pressure piping has to be removed first.
Furthermore, all valves have to be closed to avoid possible contamination. Seals, screws and other mounting
material can only be used once. When disassembling any damage to the primary element has to be strictly avoided,
especially concerning the sealing. The tubes should not be under tension.
5.8.1 Disassembly of primary elements for flange connection (sandwich or with end flanges)
and measuring systems
At horizontal assembly, first the flange screws are loosened and the upper flange-screws are to be removed. Then
the primary element may be held by means of transportation and the lower flange screws can be removed.
At vertical mounted primary elements, the order of disassembly may be chosen as you like.
5.8.2

Disassembly of plug-in orifices

Plug-in orifices may be disassembled similar to chapter 4.8.1 after removal of the screws.
Welded parts (for example measuring flanges or D-D/2-tappings) have to be separated mechanically if necessary.
This is not necessary for the disassembly of plug-in orifices.
5.8.3

Disassembly of welded primary elements

Welded primary elements have to be separated mechanically.
SITRANS FPS200
Operating Instructions, 08/2019, A5E46744245-AB
17