North Arne c: n Rock-^ t
TO
23 August 1972
IIQ
MPR 72-748
E . C . Pokrzywnicki
FROM
W . A . Taggart
D/541, E812
D/596-175, AC1 O
393x+
Comments on Cleaning of The LOX and Hydrogen Run
Tanks for Coca IV and Coca I
,ISTRIBUTIO N
,/596 -loo, AC17
F . C . Cain
Specification Nos . CC000 -90871-T7 and 00000 -90871- T4 set forth
the contractor modification requirements for the subject LOX
and hydrogen tanks , respectively . The following are Mq . terials
and Processes recommendation for changes to the cleaning sections
of these specifications .
1/598-346, Sal
. H . Monaghan
Specification No . 00000 -90871-T 7
1/572, EB12
. E . Moore
Para . 6 .6 - Insert the word "clean" between " provide" and
"blanking hubs" .
1/541, EB12
. . LaFollette
Para . 6 . 8 .2 - Add a second sentence to read : "If trichloroethane
solvent is used for degreasing do not flush, dry only . "
1/541, SS11
: . A . Harmon
Para . 6.8 .4 - Change the first sentence to read : "Dry : Purge
with MIL-P-27401 nitrogen until the dew point of the exit nitrogen
is the same as the drying nitrogen being used . "
Add new paragraph - Para . 6 .8 .7 - Final Flush Cleanliness Verification
With the vessel in a vertical position , traverse the interior of
the container with a spray utilizing deionized or distilled water
at a minimum flow rate of 40 gallons per minute and a pump pressure
of 250 plus or minus 50 lbs per sq . in . The pressure drop between
the pump discharge and spray nozzle shall be not greater than
20 psig . From a continuous flow of test medium through the sampling
line at the bottom of the container take a 500 ml sample for each
5 square feet of internal surface area . The samples shall be taken
at equally spaced intervals (vertical positions of the spray nozzle)
during the rinsing operation . In addition, a 500 ml sample of the
rinsing medium shall be taken at the beginning and at the end of
the rinsing period . The samples shall be taken from a sampling
point for the rinsing medium located as near the spray nozzle as
practical . All samples shall be collected in clean sample containers .
11
11
I I
11
BNA06776679
HDMSe00201624
MPR 72-748
TO :
Pokrzywnicki
Page
2
R. C .
FROM :
W . A . Taggar t
SUBJECT : Comments on Cleaning of The LOX and Hydrogen
Run Tanks for Coca IV and Coca I
The rinsing medium shall contain no particles over 175 microns in size and
not more than 5 particles between 100 and 175 microns in size . The rinse
effluent samples shall contain no particles over 2500 microns in size, no
more than 5 particles between 700 and 2500 microns , and no more than 25 particles between 175 and 700 microns . Particles shall be sized and counted by
filtering through Whatman No . 42 filter paper and examining the filter paper
under a 10 to 45 power microscope . Failure to meet this verification requires
re-cleaning of the vessel .
Para . 6 .10 .2 - Add a second sentence to read :
trichloroethane . "
Para . 6 .10 . 5 - Change to read :
" Dry if degreased with
" Final Flush - Cleanliness Verification"
Specification No . 00000 -90871-T4
Para . 6 .6 - Insert the word " clean" between " provide" and " closures" .
Para. 6 . 7 .i - Change to read :
Inner Vessel , Inner Surfac e
a.
b.
c.
d.
e.
Degrease (alkaline cleaner )
Final Flush - Cleanliness Verification
Dry
Inspect
Seal
OR
a.
b.
c.
d.
e.
f.
Degrease (trichioroethane)
Dry
Final Flush - Cleanliness Verification
Dry
Inspect
Seal
Para . 6 .9 .2 - Change to read :
Final Flush - Cleanliness Verification
With the vessel in a vertical position , traverse the interior of the container
with a spray utilizing deionized or distilled water at a minimum flow rate of
40 gallons per minute and a pump pressu re of 250 plus or minus 50 lbs . pe r
sq . in . The pressure drop between the pump discharge and spray nozzle shal l
11
11
I I
BNA06776680
HDMSe00201625
MPR 72-748
TO:
E . C . Pokrzywnicki
Page
3
W . A . Taggar t
FRCM :
SUBJECT : Comments on Cleaning of The LOX and Hydrogen
Run Tanks for Coca IV and Coca I
be not greater than 20 psig . From a continuous flow of test medium through
the sampling line at the bottom of the container take a 500 ml sample for
each 5 square feet of internal surface area . The samples shall be taken at
equally spaced intervals ( vertical positions of the spray nozzle ) during
In addition a 500 ml sample of the rinsing medium
the rinsing operation .
shall be taken at the beginning and at the end of the rinsing period . The
samples shall be taken from a sampling point for the rinsing medium located
as near the spray nozzle as practical . All samples shall be collected in
clean sample containers .
The rinsing medium shall contain no particles over 175 microns in size and
not more than 5 particles between 100 and 175 microns in size . The rinse
effluent samples shall contain no particles over 2500 microns in size, and
no more than 5 particles between 700 and 2500 microns, and no more than 25
particles between 175 and 700 microns . Particles shall be sized and counted
by filtering through Whatman No . 42 filter paper and examining the filter
paper under a 10 to 145 power microscope . Failure to meet this verification
requires re-cleaning of the vessel .
Para . 6 . 9 .3 - Change the first sentence to read : " Dry: Purge with MIL - P-271+01
nitrogen until the dew point of the exit nitrogen is the same as the drying
nitrogen being used . "
It is highly recommended that the above cleaning, cleanliness verifications,
and inspections be conducted after the tanks have been installed on site
in the Coca area . This will avoid the potential of recontamination or the
regeneration of contamination in the tanks during handling , moving and final
installation .
W . A . Taggart
nw
J. H . Lieb
Manager
Chemistry and
Nonmetallic Material s
11
11
I
BNA06776681
HDMSe00201626