Chemical Engineering June 2015 - 28

RVT Process Equipment
longer-lasting internals, mock says
the focus is on effective fabrication
of product and, often, the use
of exotic materials. " The availability
of exotic materials provides us
with the ability to create a highperformance
liquid distributor that
can perform well in service, yet be
made out of materials that will survive
the harsh chemical environment
in which it is used. "
He says that it was very common
for chemical plants to use ceramic
liquid distributors, but often the densities
were not high enough for the
service. " But today's use of high-end
metals and plastics for fabricating
high-performance internals is changing
the market. "
As a result, rVT focuses not on a
specific product line, but on the ability
to provide its internals with innovative
designs, as well as a variety of
different materials of construction. For
example, rVT supplies mass valve,
sieve and dual-flow trays, bubble cap
trays, tunnel trays (Figure 4) and also
special tray constructions (such as
cascade or chimney trays, shower
decks and trays for foaming systems)
in metal, and also in thermoplastic
materials, such as polypropylene homopolymer
(PPH), polyethylene (PE),
polyvynal chloride (PVC), chlorinated
PVC (PVC-C), polyvinylidene fluoride
(PVdF), polytetrafluoroethylene (PTFE)
and TFm/PTFE.
And, highly corrosive and hightemperature
operations often require
higher-grade materials. If chemicalresistant
plastic material cannot be
used due to decreasing stability at
high temperatures, high-grade special
materials like zirconium or tantalum
can be used. " However, in some
cases we can offer chemically resistant
and competitive constructions
that combine several materials in one
part, such as a CFC load-bearing
frame and distribution device made
of tantalum drip tubes with all other
components made of TFm/PTFE, "
explains rVT's mock. " The ability to
provide high-performance internals
in combination with other lower-cost
materials helps increase capacity
FIGURE 4. RVT supplies mass valve, sieve and
dual-flow trays, bubble cap trays, tunnel trays
(shown here) and also special tray constructions,
such as cascade or chimney trays, shower decks
and trays for foaming systems
and reliability at a fraction of the cost
of using all high-end materials. "
Thanks to the variety of internal materials
and designs available to today's
processors, increasing throughput,
efficiency and capacity while decreasing
shutdowns and costs associated
with maintaining columns and towers
has never been easier.
■
Joy LePree
CHEMICAL PROCESSING SOLUTIONS
Complete process control for every aspect of your chemical operation.
The Model 1049 Secure-Gard is a
pilot-operated vent valve intended
for installation on atmospheric and
low-pressure storage tanks, vapor
recovery systems, and process
systems.
The Model 521 is a sliding stem,
globe style, bellows sealed,
pneumatically actuated control valve
designed for maximum corrosion
resistance in pure chemical service.
The Model 1078 Vacu-Gard is a
pilot-operated valve, specifically
designed to reduce blanketing
gas losses on low-pressure
storage tanks.
For immediate access to our
product resource files, visit
www.cashco.com/chem
www.cashco com
Innovative Solutions
Cashco, Inc. · P.O. Box 6, Ellsworth, KS 67439-0006 · Ph. (785) 472-4461, Fax: (785) 472-3539
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Chemical Engineering June 2015

Table of Contents for the Digital Edition of Chemical Engineering June 2015