Frequently
Asked Questions:
How
does your Pyewch® system work?
The Pyewch® System is a zoned heating system used on foreline
and exhaust line vacuum tubing and components. Each zone
is comprised of numerous covers totaling up to, but not exceeding,
10 Amps per zone. Since our heater jackets are so efficient,
we are able to accomplish the job using significantly less power
than competing systems. A PID microprocessor based temperature
controller controls each zone. RTD's are used to sense
the temperature of the pipe, not the heater. TOP
How
do I measure the piping?
It is not necessary for you to measure the pipe unless you are
simply trying to get a ballpark pricing for the project. We
provide a complete turnkey system: measured, engineered, and
installed. The only thing that we ask is that you provide
the proper power receptacle near the control cabinet and that
you have some type of shelf or mounting bracket near where you
would like the controls mounted. TOP
How
is your system different?
TGM is proud that we provide a turnkey solution for heating
your pump lines and your process gas delivery lines. Pyewch®
is our patented insulated heating system that is PID controlled.
The unique insulated construction of our heater jackets allows
us to run longer heat zones with more even heating than previously
thought possible. The actual power requirements to run
our system are significantly less than competing products.
This translates into a much lower cost of annual operation.
It is also our goal to continue to decrease the power requirements
of future products even further. Since we measure and
manufacture the system, you can be assured that it will fit
the pipe and that we will use the fewest covers necessary to
do the job properly. TOP
How
much maintenance will I need to do?
There is little or no maintenance involved. When you need
to remove a cover, simply turn off power to that zone and allow
the system to cool below 50°C, then disconnect the power
jumper and remove the cover. When it is time to reinstall
the heater jacket, inspect the pipe and the inside of the cover
carefully for metal burrs, or any other foreign matter that
might puncture, damage, or burn if in contact with the inside
of the heater jacket. If the pipe is dirty, clean it before
reinstalling the cover. If the heater jacket is dirty,
both the inside and outside of the cover can be cleaned with
a mild isopropyl alcohol solution and lint free cloth.
Be sure that the cover is dry before reinstalling and power
up. Also, check to see that all the power cables and jumpers
are in place before reinstating power. TOP
How
can I protect my personnel from getting burned on the exterior
surface?
This is not an issue. Our covers exceed the most stringent
standards for personnel burn protection: SEMI S2-93 at 65°C,
ASTM C1055 at 60°C, and the Mil SPEC _769 at 51.6°C.
Shown in the graph below: even at an internal operational temperature
of 150°C, the exterior surface temperature of our cover
never exceeds 40°C. TOP
How
do I clean a cover?
If the heater jacket becomes dirty, both the inside and outside
of the cover can be cleaned with a mild isopropyl alcohol solution
and a lint free cloth. Be cautious not to over wet the inside
of the cover and be sure to let it dry thoroughly before power
up. TOP
Our
sub-fab is dirty and sometimes has spills, what happens to a
cover if it gets wet?
Each cover has a resilient waterproof exterior jacket, along
with military style connectors that are moisture resistant when
mated, the extra safety precaution of an integral ground plane
over the heating element and each control cabinet has built-in
GFCI for personnel protection. During installation every
precaution is made to route both the seams and cables to provide
a watershed so that, in the unlikely event of a spill, water
will just run off. If the water does migrate into a longitudinal
lap and soak a heating element, the GFCI breakers will trip.
This is for your safety! Thoroughly remove and dry all
wet heater jackets and bench test before attempting to restart
the system. TOP
How
can I tell if a cover is out?
Each Pyewch® heater jacket has a built-in indicator lamp.
During normal operation the light will cycle on and off with
the PID controllers application of power to that zone.
All covers have a built-in over-temp protection device that
will open if the cover exceeds a predetermined operational temperature.
This device opening in an over-temp situation or a failure in
the heating element will cause the green lamp to go out.
This is how you can visually tell if a cover is not functioning
properly. TOP
What
temperature do Pyewch® heater jackets come in?
Unlike some other products, our covers are controlled and can
be operated accurately at any temperature up to 200°C.
TOP
What
size of pipe can we heat with these covers?
40,50,80,100, and 150 mm stainless steel tubing and custom sizes,
including small tanks. TOP
Do
you manufacture standard sizes?
Pyewch® heater jackets are made to fit standard 40,50,80,100,
and 150 mm stainless steel tubing. However, we have manufactured
custom covers to fit iron pipe and tanks up to 4' in diameter.
TOP
What
type of fastening method do you use?
All of our covers use a clean room approved hook and loop type
closure. This fastener gives adjustable means of closing
the heater jacket. TOP
