Thermon MIQ Mineral Insulated Heating Cable v.1 - Manual (Page 4)

MIQ TM Mineral Insulated Heating Cable
Cold Lead Wires
Gland Connector
Cold Lead
Flange Valve
MIQ Heater Cable
Stainless Steel
Tie Wire
or Banding
Pipe Support Shoe
Cable Set
Strain Relief
Fitting
Cable Set
Hot-To-Cold
Fitting
Cable Allowance for Inline
Heat Sinks (Typ.)
Illustration A: Temporary Installation . . .
Before Installing Cable . . .
1. Be sure all piping and equipment to be traced is
completely installed and pressure tested.
2. Surface areas where heat tracing is to be installed must
be reasonably clean. Remove dirt, rust and scale with
a wire brush and oil and grease fi lms with a suitable
solvent.
3. Review any applicable local codes and standards prior to
beginning the installation.
4. Refer to heat tracing isometric drawings for power point
location, equipment allowances, etc. Confi rm if MIQ sets
are to be connected in series.
5. Confi rm measurements of piping length, including
in-line equipment before beginning installation.
6. Test insulation resistance of heating cable set when
received using a 500 Vdc megohmmeter. The minimum
acceptable reading is 20 megohms between conductor
and metallic sheath. IEEE 515 and EN-IEC 60079-30
recommend use of a 1000 Vdc megohmmeter.
(Record 1, Checklist on Page 9)
Initial Installation . . .
1. Determine the orientation of the heating cable(s) on
the pipe. The upper 90° of the pipe should be avoided
to minimize the possibility of mechanical damage to
the heating cable. Also, the sides of the pipe should be
avoided since this is the normal location of the insulation
seams. Refer to Illustration B for typical heating cable
orientations.
2. Begin temporary installation at the proposed hot-to-
cold junction (power end) location and lay out heating
circuit on the pipe. Refer to Illustration A for temporary
installation.
3. Make heating cable allowances for valves, fl anges,
elbows and supports as per the applicable drawings and
table on pages 4 thru 6 of these installation procedures.
4. Fix hot-to-cold junction at 15 cm distance on both
sides using stainless steel tie wire or banding. Do not
loop back cold lead on small diameter pipes where the
minimum bending radius will be exceeded.
5. Install cable with slight "wave" on pipe. Secure cable to
pipe with stainless steel tie wire or banding.
6. Adjust cable where necessary.
Illustration B: Typical Orientation of Heating Cable and Sensor Location . . .
45º
45º 45º 45º
90º
Dual Cable Installation Triple Cable Installation
45º
45º
Temperature
Sensor (Typ.)
Heating Cable
(Typ.)
Pipe Wall
3