© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
13
Picture
Description
Upstream
length
2
Downstream
length
2
Effect
Single elbow
30 * D1
10 * D1
Distorted flow profile
Complex feed-in situation
(header)
40 * D1
10 * D1
Flow profile will be
distorted
Double elbow, multiple
elbows following each
other
40 * D1
10 * D1
Distorted p
swirl
Diameter change from
small to large (gradual or
instant)
40 * D1
5 *D1
Jet shaped flow
Diameter change from
large to small (gradual
change, between 7 and
15 degrees)
10 * D1
5 * D1
Flattened flow profile
1 = inner diameter; 2 = minimum length
6.2
Installation without tubing kit
When you order your VPFlowScope in-line as a base model only, it is delivered without up- and
downstream piping. You can install it directly between two threaded pipe ends. Please be aware that
the connection between the pipe and the VPFlowScope in-line is very important. Any diameter
mismatch will result in higher inaccuracy. For example the inner diameter of the pipe may affect the
reading. Depending on the pipe wall thickness, the inner diameter can be smaller, which results in a
higher measurement value. If you want to be sure of the connection, ask us to supply you with the
piping kit.
The connection is BSP inner straight thread; 0.5", 1" or 2" depending on the VPFlowScope in-line
model. For NPT thread, chase the BSP thread of the pipe ends with a die.
6.3
Installation with tubing kit
If you ordered the tubing kit or a full start kit, the VPFlowScope in-line is delivered with an optimized
up and downstream piping kit, to ensure at least 20 times the pipe diameter ( for 0.5" and 1" )
upstream length. For economical reasons, the 2" model is delivered with the pipe length
15 times
the pipe diameter upstream
. For optimum results, see the piping table and create additional
upstream pipe length when required.
