KROHNE VFM 1091 - Manual (Page 35)

Primary head VFS 1000 (I)
Versions and meter sizes Pressure ratings see “Dimensions” Table
(Note operating limits given in DIN 2501 and ANSI B 16.5)
Sandwich design to ... DIN 19205 DN 25 to 150
ANSI 1” to 6”
Flange connections to ...DIN 2501 DN 10S to 200
ANSI B 16.5 3/8”S TO 8”
Groove joint to... DIN 2515 DN 25 TO 150
(Optional) ANSI 1” to 6”
Process and ambient temperature see Diagram III
1 Housing
SR.NO. DESCRIPTION MATERIAL REMARKS
GASKET, TEFLON (PTFE)
GASKET, STYLE AF-160, NON
ASBESTOS
5. Gaskets GASKET, STYLE AF-139, NON
ASBESTOS Any one as per application
M10 = 5.5 kg - m
M8 = 2 kg - m
4. Bluff body metal seal C ring Inconel Ni plated Once used metal C ring shoul d
not be used again. Tightening
torques for new seals are
m M6 = 1.5kg -
3.
a. upto 180 deg C(356deg.F) Viton O ring Non steam applications
Seals
b. upto 220deg C(428deg.F) Kalrez 4079 O ring Non steam applications
c. upto 240deg C(464deg.F) Parofluor O ring Steam applications
2. Vortex shedding body Unalloyed Titanium (No.3.7035) as standard
Stainless Steel, A351 CF3M (316L) Upto size DN100/4''
Stainless Steel, A351 CF8 (304) From DN150/6'' to DN200/8''
Materials
Max. allowable operating pressure (primary head) 40 bar (580 psig), optionally upto 100 bar (1450 psig)
Hazardous Duty Versions: FM, CSA, PTB approvals pending.
Error limits
Measuring error (in linear range) ± 1 % of measured value for DN 25 (1”) & above
± 2 % of measured value for DN 10S (3/8”S) to DN 20 (3/4”)
Repeatability (in measuring range) ± 0.5 % of measured value
Temperature Error - 0.025 % of measured value per 10Kelvin (50 o F) variation
Pressure loss D p
at normal conditions
for air[1.013 bar (14.7psig)/0
o c(32 o F) / r
n
= 1.29 kg/m(0.081 lbs/ft)] see Diagram I
for water [20 o C (68 o F) / r
n
= 998.2 kg/m (63.32 lbs/ft)] see Diagram II DP = Pressure loss in Pa
at operating conditions C = A constant
for gases and liquid DP= C * Q
v
2 * r
op
(values: see Table)
Qv = Flow rate in m/hr
for saturated steam DP = C * Qm2 Qm = Flow rate in kg/hr
r op r
op
=operating density in kg/m
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