Nelson Global Products specializes in exhaust and fabricated
tube assemblies for the on-highway
markets, including light-, medium-and heavy-duty trucks; off-highway
machinery such as agricultural and
construction equipment, industrial
machines and equipment, material
handling equipment, small engines,
commercial turf and lawn and garden
equipment, and even larger applications such as locomotive, marine
and power generation systems.
The company’s product line spans
an equally broad range to encompass
exhaust systems and fabricated tube
products, including exhaust gas recirculation (EGR) system components,
charge-air tubes, coolant tubes, exhaust
tubes and its newest line of Thermal
Management Tubing (TMT) to support the thermal requirements of complex diesel emissions systems. Nelson
anticipates that the TMT segment will
be a strong growth area going forward,
as the products are a key contributor
to the performance of aftertreatment
systems and end-user safety.
The advent of Tier 4 interim and
final off-highway emissions standards,
as well as the EPA 2010 on-highway
regulations, has driven the industry
toward a 100% insulated product, as
thermal performance is a key ingredi-
Nelson’s new Thermal Management Tubing (TMT) is designed to sup-
port the thermal requirements of complex diesel emissions systems.
Through the TMT line, Nelson offers a range of insulation technolo-
gies, including thermoplastic wrap insulation (left) and metal encap-
sulated insulated tubing (right).
ent to the proper operation of aftertreatment technology. Nelson offers
a range of insulation technologies,
including double-wall air gap, double-wall insulated, ceramic coated tubing,
metal encapsulated insulated tubing
and thermoplastic wrap insulation.
According to Frank Gould, engineering team leader, Exhaust Products,
double-wall air gap or double-wall insulated is the most mechanically robust
option. This insulating technique utilizes
a 16- to 18-gauge aluminized (or painted mild) steel outer shell that follows
the same centerline as the uninsulated
inner tube assembly. The outer shell is
bent, cut down the center line, pieced
over the inner tube assembly and welded shut. The result is a product with
the look and function of the uninsulated
inner tube assembly with the addition of
a (typically) 1 in. thick insulation barrier.
Brackets can be hung or welded to the
steel outer shell.
Thermolastic wrap insulation
involves wrapping the tube assembly
with a thin foil in which insulation is
pre-mounted. The thickness is con-
trolled by the number of wraps down
the centerline of the tube assembly
(three complete wraps equal 1 in.
in the diameter of the insulation).
As a finishing step, the insulation
is wrapped with a durable silicone-
based wrap that offers excellent pro-
tection of the underlying insulation,
Gould noted. While the insulation
process involves a moderate amount
of labor, there is no expensive tooling
or time-to-market challenges.
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