Piping To Improve Durability; Cryogenic And High Process Temperature Version Insulation - YOKOGAWA DY025 User Manual

(4) Pipeline Diameter and digitalYEWFLO
The process pipeline inner diameter should be slightly
larger than the vortex flowmeter inner diameter,
schedule 40 or lower pipe should be used for 1/2 to 2
inch flowmeters and schedule 80 or lower pipes for 3 to
8 inch flowmeters.
(No Good)
D D
1 2
< D
D
1 2
Figure 2.6
(5) Waterproof Construction
The vortex flowmeter is of IP67, NEMA4X
tightprotection. However, it cannot be used under water.

2.4 Piping to Improve Durability

(1) Pipe cleaning
• Flushing of pipe line (Cleaning)
Flush and clean scale, incrustation and sludge on the
inside of pipe wall for newly installed pipe line and
repaired pipe line before the operation.
• Fluid Carrying Solids
Do not measure fluids that carry solids (e.g. sand and
pebbles). Make sure users periodically remove solids
adhering to the vortex shedder.
• Obstruction of flow fluids may cause to make a chemical
reaction and the fluid will be crystallized and hardened,
and be deposited on the pipe wall and shedder bar.
In those cases, clean shedder bar.
(2) Bypass piping
Bypass piping is convenient for the maintenance of
digitalYEWFLO (vortex shedder cleaning, etc.).
Flow
Upstream shut-off valve
Figure 2.7
2.5 Cryogenic and High process
Temperature Version Insula-
tion
When you are using cryogenic type and high process
temperature version of digitalYEWFLO Vortex Flowmeter
(Option code/HT /LT), refer to illustrated insulation method
as shown in Figure 2.8
(Good)
D D
1 2
D D
1 2
F020305.EPS
Bypass shut-off valve
digitalYEWFLO
Downstream shut-off valve
F020401.EPS
(1) Installing Cryogenic Vortex Flowmeter
For cryogenic applications, use stainless steel mounting
bolts and nuts to install the flowmeter. These can be
ordered separately from YOKOGAWA. Cover the
flowmeter body with heat insulating material so that the
flowmeter can be maintained at ultra-low temperatures
(refer to the Figure 2.8).
(2) Maintenance for Cryogenic Applications
DY/LT uses special materials that produce vortex
flowmeter for cryogenic applications. When you are
replacing a shedder bar, specify cryogenic type shedder
bar. To avoid condensing in the terminal box, ensure that
the wire connecting port is well sealed.
Cold insulating material
Figure 2.8
(3) Installing High Process Temperature
Vortex Flowmeter
Installation of the flowmeter is the same as the standard
type. Cover the flowmeter body with heat insulating
material following instruction of "CAUTION".
CAUTION
Keep the upper limit of heat insulating material to
prevent overheating of the terminal box.
Seal the heat insulating material to avoid hot-air
leakage.
50mm min.
UPPER LIMIT OF
HEAT INSULATING
MATERIAL
Nominal Size: 100mm or under
(4) Maintenance for High Process Tempera-
ture Applications
DY/HT uses special materials that produce vortex
flowmeter for High Process Temperature applications
When you are replacing a shedder bar or a gasket,
specify High Process Temperature type.
2-5
2. INSTALLATION
Bracket
F020501.EPS
50mm min.
UPPER LIMIT OF
HEAT INSULATING
MATERIAL
Nominal Size: 150mm or over
F020501a.EPS
IM 01F06A00-01E