Installations disturbing the gas flow directly upstream of the turbine meter
must be avoided
(see DVGW guideline G 492 II and PTGB guideline G 13).
An inlet pipe of at least 2 x DN is required upstream from the turbine meter TME400.
The inlet pipe must be designed as a straight pipe section with the same nominal di-
ameter as the meter. With heavy upstream pertubations, installation of straighteners
is recommended (refer to the table on the next page). A pipe or bend with the nomi-
nal diameter of the meter having a total length of 2 x DN must be arranged down-
stream from the meter.
Temperature measuring devices must be installed at a distance of at least 1 x DN or
at least 300 mm with nominal diameters DN 300.
If there is pertubation (e.g. a gas pressure control device) upstream from the inlet
pipe, a perforated plate straightener is also necessary. Perforated plate straightener
according to ISO 5167-1 or the type RMG LP-35, which cause a pressure loss by a
factor of 2.5 in comparison with the standard straightener, can be used.
Recommended installation with straightener Perforated plate straightener LP 35
1 Perforated plate straightener
•
The opening angle of the reducing or expansion pieces which are installed up-
stream from the TME400 turbine meter must not be more than 30°.
A screen must be installed on the inlet side of the meter for protection of
the turbine meter from foreign objects which may be present in
the gas flow. The screen can be, for example, a perforated plate/filter of
0.15 mm (available as an accessory).
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