KROHNE VFM 1091 - Manual (Page 6)

6
•
In case of steam or compressed gas, a moisture separator may be used
50D upstream of the meter if the dryness fraction is less than 95%.
•
For gases, a filter or strainer may be used to remove solid particles.
This is specially important for meter sizes below 1".
•
Meter sizes DN25, 40, 50, 80, 100 and 150 (1" to 6")
•
Pipe flanges
(Pressure Ratings
DIN: DN25/PN40, 100; DN40/PN40, 100;
DN50/PN40, 64, 100; DN80/PN40, 64, 100;
DN100/PN16, 40, 64 and DN150 / PN16, 40.
ANSI: 1" to 6” / #150, 300 SORF)
•
Gaskets inside diameter must be greater than the inside diameter of the
Primary head, e.g. Use flat gaskets to DIN 2690, Gaskets must not
project into the effective pipe cross sectional area. washers, nuts and
bolts are
•
Bolts, nuts and washers are supplied with meter, check flange
connection for leak-tightness after flowmeter installation.
•
Meter sizes DN10S, 10, 15, 20, 25, 40, 50, 80, 100, 150
and 200 (3/8"S to 8")
•
Pipe flanges
(Pressure ratings
DIN: DN25/PN40, 100, DN40/PN40, 100; DN50/PN40, 64, 100;
DN80/ PN40, 64, 100, DN 100 /PN16, 40, 64; DN150/PN16,
PN40, DN200/PN10, 16 and
ANSI: 1/2” to 8" / # 150, 300 SORF)
•
Gaskets are supplied by us with flanged unit.
•
check flange connection for leak-tightness after
flowmeter installation.
To measure the temperature and pressure of the medium for either mass
flow/normalized f1ow computation using external flow computer or
measure operating density using external pressure and temperature
measurement (e.g. to feed the density value in the VFM off-line mass
or normalized flow computation) suitable measuring points should
Installation upstream of f1owmeter
Min. distance: 20*DN (DN = meter size)
Installation downstream of flowmeter
Min. distance: 5*DN (DN = meter size)
Allowance must be made for the pressure drop in the flowmeter as
correction value for operating conditions prevailing upstream of the
flowmeter.
2.2 Sandwich type to DIN 19205 / ANSI
2.3 Flanged type to DIN 2501 / ANSI B 16.5(SCH-40)
2.4 Temperature / Pressure measurement for External density
compensation