to the possibility of tearing. A valve
that is to be end sealed and not bagged
should have desiccant appropriate for
the valve’s size and for the period it
will be stored. Cleaned and degreased
sealed valves are especially prone to
rusting because of condensation that
forms inside the completely unlubricated valve.
MATERIALS Q&A CONTINUED FROM PAGE
40
TIPS FOR STORAGE
Of course the optimum storage solution is inside a nice dry warehouse,
but that can get expensive. So in lieu
of a roof and four walls, here are
some tips to follow if you have to store
valves outside for a long period of
time:
; Make sure that the end protectors are on the valve and tightly
attached.
; Do not lay valves horizontally
on the ground on one flange.
; If stored flat on the ground, be
sure that timbers are placed
under the flange or valve body
to keep it off the ground.
; If valves are to be stored outside for a year or more, a spray
of WD- 40 or other rust
inhibitor on the ends will help
eliminate possible corrosion and
damage to the raised faces of
flanged valves.
; If possible, the stem threads on
OS&Y valves should be protected from the elements.
; Try not to store valves near an
abrasive blasting area.
; If dirt and grit has entered the
valve, remove it with a careful
blast of compressed air before
the valve is cycled or installed.
; Take extra care in storing
resilient seated valves as their
seating surfaces are easily damaged VM
rial is required to be impact tested (such
as ASME SA352 LCC). Assuming that
is so, and assuming the PQR lists a maximum interpass temperature of 500° F
(260° C), the WPS can be written with a
maximum interpass temperature of up to
600° F (315° C). If creating or revising a
WPS to increase the maximum interpass
temperature to higher than 600° F (315°
C) is desired, the procedure would need
to be requalified.
Note there are many QW-4XX paragraphs that describe variables; however,
the only ones that apply to the welding
procedure are those referenced in the
QW-25X tables for the welding processes being used.
A valid WPS lists all essential and
non-essential variables (and supplementary essential variables if the base
metal is required to be impact tested),
and provides appropriate values for
each.
New users of Section IX sometimes
think they can just use the example
forms in Section IX and fill them in
based upon what seems “obvious.” This
approach is unlikely to result in a procedure that properly addresses the variables. The best way to ensure a WPS is
complete and correct is to use the QW-
250 tables as a type of “index” to
ensure that all appropriate variables
are included and properly addressed,
and to review the definitions in QW-490
to ensure all terminology is interpreted
and used correctly. VM
Don Bush is a principal materials engineer at
Emerson Process Management-Fisher Valve Division ( www.emersonprocess.com). Reach him at
Don.Bush@Emerson.com.
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