Flowmeter SVTU-11B, Operating Manual

Page: 27 / 68

27
The RTD can be installed on the upstream or downstream sections of FS, but installa-
tion on the downstream section is preferable. While installing the RTD after FS, the distance
between the bush and FS should be not less than 5 DN and at installation before FS - not less
than 10 DN.
After bush welding, it is necessary to process its thread by tap
М
10
х
1.5 or
М
16
х
1.5
(depending on bush type).
While installing the RTD with inclination 45° or 60°, it is necessary to drill 10 mm hole
(16 mm for a thermal pocket) and to saw it up to a necessary oval depending on thickness of
a pipe wall (see figure 9.7).
The sealing surface of the bush should be protected from splashes of the fused metal
during welding.
Before application of sealing gasket (fluoroplastic ring) a sealing surface of the bush
should be greased.
While screwing the RTD in the bush, the force put to a wrench of 200 mm length,
should be no more than 5 kg and provide hermetic seal. The deformation of fluoroplastic
gasket in the gap between sealing surfaces of RTD and the bush is not permitted.
Before screwing the RTD in the thermal pocket it is necessary to be convinced of clean-
liness of a thermal pocket and to fill it on 1/8 of volume with high-temperature silicon lubri-
cant of any type.
Т
able 9.2
DN,
mm Configuration of R
Т
D,
nominal length
(L
TD
, mm), type
Configuration variants for bushes of first
type (internal thread of bushes is
М
10
х
1.5)
Angle
of incli-
nation
Labeling Marking
32 SMP.405212.001-03
L
RTD
=58; type 4
SMP.723144.007 1
45
°
50 SMP.723144.008 2 60
°
65
SMP.723144.009 3
90
°
80
100
SMP.405212.001-01
L
RTD
=80; type 2
125
45
°
150
SMP.405212.001-02
L
RTD
=150; type 3
SMP.723144.007
1 60
°