Before You Start - WIKA TC59-V Betriebsanleitung

6. Commissioning, operation

6.2 Before you start

Ensure there is enough MI cable to reach the termination box for each V-PAD
■
especially if on-site bending and expansion loops are required.
Avoid passing MI cable through hot zones.
■
Route the MI cable thermocouple in contact with the coolest side of the tube. This will
■
EN
substantially increase the life expectancy.
Ensure all surfaces to be welded are cleaned by appropriate methods.
■
When grinding always use clean abrasive materials that have not been used on other
■
materials.
A wire brush is not adequate to properly clean the tube.
■
Test fit the V-PAD
■
cable was provided.
Ensure all bending is correct and sufficient allowance is provided for tube movement.
■
Based on the customer's weld procedure, determine the appropriate preheat, interpass
■
and weld filler metal composition for the parent materials.
Determine if controlled cooling or post weld heat treatment is required.
■
Bend radius
Always use an appropriate tube bender for the corresponding diameter of MI cable. If
bending by another means then use bends with radius equal to or greater than those on a
tube bender. The minimum bend radius is 5 times the diameter of the MI cable.
6.3 Sensor positioning
The V-PAD must be located at the peak heat flux of the tube it is mounted on in relation to
®
the burners. This must be done to ensure the reading accuracy of the V-PAD
scale and rust from the tube in the locations required for welding to the tube.
12
thermocouple at the desired location to ensure adequate length of MI
®
WIKA operating instructions model TC59-V (V-PAD
,
®
. Remove
®
)
®