Thermocouples (TC)
and supports are the main objects that determine the width
of a blanket. Blanket cutouts for heater arrays with exposed
J-Boxes, with the aid of our worksheet, are easily figured
as follows:
For even heat profile
heaters should be evenly spaced along the barrel or line with
the Thermocouples exactly in-between the heaters. (Theoretically)
Heater
Spacing
FIG.
NOTE: Right-click the mouse button on the image below
and choose "Zoom In." Press and hold the left
mouse button to move the image around. Right-click >
"Show All" again to zoom all the way out.
M1 above
measures 21" between the TC/support
Divide by
the number of heaters (4)
Heaters
evenly spaced at 5-1/4"
TC/support
is between the heaters at 2-5/8
Your
Measurements Become the Part No.
Note: Circumference
and width measurements are rounded up to the next whole
inch. These rounded measurements become our design code/part
no.
Only four (4) types
of information are needed.
The first measure
is the blanket inside circumference measurement around
the heaters including the spring bolts if present.
The blanket
width measurements between the TC/supports (or other
types of obstacle).
The J-Box
letter associated with the size of the J-Box cutouts.
See table below.
And last the
number of heaters within each of the blanket areas.
Summery
Circumference
Width
J-Box cutout
latter
Number of
heaters
Download
and print our Worksheet for your survey and our Fax Cover
Page to use when you send your order to us. No need to
inter your survey into the computer.
Worksheet
Fax
Surveying
a Line (Walkthrough)
Now let's say the
above figure of a ø6" barrel is yours. It has
Ceramic or Mica Band Heaters. You want to survey it and order
blankets to insulate it, but not the J-Boxes.
The blanket areas/zones
are labeled; Rear, M1, M2 . . . FRONT.
Here' s how to
determine the Part Nos. for those areas.
Start at
the Rear of the machine, name the zone "REAR"
Part No.
Prefix for ceramic/mica band blankets with cutouts is
CSTM.
Circumference
= 22.5" round this up to 23".
Rear width
= 5-1/4" round this up to 6"
and make it a double digit 06.
J-Boxes
fit in a 2.5x4.5 cutout, letter R from the chart below.
