Chemical Engineering January 2017 - 45

Cotter Brothers, Inc.
GF Piping Systems
Weld bead
Two ends fused together
with base metal only
GF Piping Systems
Weld bead run direction
Weld bead width
I.D. of two separate sections of tubing
FIGURE 2. A magnified photo of a cross section
of two stainless-steel tubes autogenously welded
together
approach to, or the results of, their
" chemical purity. "
Mosby's Dictionary of Complementary
and Alternative Medicine
[1] defines " chemical purity " as, " the
degree to which a substance is undiluted
or unmixed with extraneous
material, typically expressed as a
percentage (%). " And a chemical's
purity is indeed expressed as a percentage,
in which a chemical with a
FIGURE 3. This image shows a bead and crevice
free (BCF) fusion weld of a tee section [3]
purity of 98% implies a content of
2% impurities. The purity of gases
too, is defined in much the same
manner, but is, in many cases, assayed
and certified to more finite
values. By assigning a purity factor,
as an example, of 99.98% helium or
99.999% argon (referred to in industry
jargon as " five-nines " ), the purity
of those gases is thereby quantified
and specifically defined.
Tube ID wall light reflection
FIGURE 4. This image shows a section view of a
BCF fusion weld [3]
Having such specific quantitativepurity
values creates definable parameters
for determining the degree
of chemical purity that needs to be
specified, procured and receipt-verified
for use in electronics chemicals
where purity is a critical factor.
Application of the terms high purity,
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CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
JANUARY 2017
45
ID weld seam width

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Chemical Engineering January 2017

Table of Contents for the Digital Edition of Chemical Engineering January 2017

Contents
Chemical Engineering January 2017 - Cover1
Chemical Engineering January 2017 - Cover2
Chemical Engineering January 2017 - Contents
Chemical Engineering January 2017 - 2
Chemical Engineering January 2017 - 3
Chemical Engineering January 2017 - 4
Chemical Engineering January 2017 - 5
Chemical Engineering January 2017 - 6
Chemical Engineering January 2017 - 7
Chemical Engineering January 2017 - 8
Chemical Engineering January 2017 - 9
Chemical Engineering January 2017 - 10
Chemical Engineering January 2017 - 11
Chemical Engineering January 2017 - 12
Chemical Engineering January 2017 - 13
Chemical Engineering January 2017 - 14
Chemical Engineering January 2017 - 15
Chemical Engineering January 2017 - 16
Chemical Engineering January 2017 - 17
Chemical Engineering January 2017 - 18
Chemical Engineering January 2017 - 19
Chemical Engineering January 2017 - 20
Chemical Engineering January 2017 - 21
Chemical Engineering January 2017 - 22
Chemical Engineering January 2017 - 23
Chemical Engineering January 2017 - 24
Chemical Engineering January 2017 - 25
Chemical Engineering January 2017 - 26
Chemical Engineering January 2017 - 27
Chemical Engineering January 2017 - 28
Chemical Engineering January 2017 - 29
Chemical Engineering January 2017 - 30
Chemical Engineering January 2017 - 31
Chemical Engineering January 2017 - 32
Chemical Engineering January 2017 - 33
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Chemical Engineering January 2017 - 35
Chemical Engineering January 2017 - 36
Chemical Engineering January 2017 - 37
Chemical Engineering January 2017 - 38
Chemical Engineering January 2017 - 39
Chemical Engineering January 2017 - 40
Chemical Engineering January 2017 - 41
Chemical Engineering January 2017 - 42
Chemical Engineering January 2017 - 43
Chemical Engineering January 2017 - 44
Chemical Engineering January 2017 - 45
Chemical Engineering January 2017 - 46
Chemical Engineering January 2017 - 47
Chemical Engineering January 2017 - 48
Chemical Engineering January 2017 - 49
Chemical Engineering January 2017 - 50
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Chemical Engineering January 2017 - 57
Chemical Engineering January 2017 - 58
Chemical Engineering January 2017 - 59
Chemical Engineering January 2017 - 60
Chemical Engineering January 2017 - 61
Chemical Engineering January 2017 - 62
Chemical Engineering January 2017 - 63
Chemical Engineering January 2017 - 64
Chemical Engineering January 2017 - Cover3
Chemical Engineering January 2017 - Cover4
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