ORGANIZATION:

INAM EH44 1 CHhRT NO. :

I 2

MARSHALL SPACE FLIGHT CENTER

ALTERNATE CLEANERS TECHNICAL D A T A EXCHANGE

L O X COMPATIBILITY OF RESIDUES

NAME :

DATE :

AUGUST 1993

e

e

e

e

e

e

e

e

e

CONTENTS

Purpose

Background

P o t e n t i a l B e n e f i t s

Tes t Method

Tes t Procedure

Ambient Pressure Lox Impact Tes ter

P r e l i m i n a r y R e s u l t s Tables

P r e l i m i n a r y R e s u l t s Graphs

Complete Test Method D e s c r i p t i o n

P r e l i m i n a r y Conclus ions

MARSHALL SPACE FLIGHT CENTER I NAME : I ORGANIZATION:

ALTERNATE CLEANERS TECHNICAL

LOX COMPATIBILITY OF RESIDUES C H A R T NO. : D A T A EXCHANGE

EDDIE D A V I S

AUGUST 1993 DATE :

I I

PURPOSE

Chal lenge t h e N o n v o l a t i l e Residue c o n t a m i n a t i o n l e v e l f o r LOX Systems e s t a b l i s h e d by MSFC-SPEC-164.

BACKGROUND

MSFC-SPEC-l64A, re leased i n 1970, a l l o w s a maximum ( N V R ) s u r f a c e con tamina t ion o f 1 .0 m i l l i g r a m s per square f o o t o f s u r f a c e area .

No fo rma l and e x h a u s t i v e s tudy has been conducted t o de termine t h e r e a l NVR c o n t a m i n a t i o n l e v e l t h a t w i l l p r e s e n t problems i n l o x systems.

Study was e s t a b l i s h e d i n A p r i l , 1992, a t t h e M a t e r i a l s Combustion Research F a c i l i t y t o address t h i s problem.

POTENTIAL BENEFITS

Determine t r u e accep tab le con tamina t ion l e v e l s f o r l o x systems.

Envi ronmenta l b e n e f i t i n more l i b e r a l c o n t a m i n a t i o n l e v e l s a l l o w use o f l e s s c l e a n i n g agents and perhaps i i f r i e n d l i e r i i ones.

Cost sav ings i n u s i n g l e s s c l e a n i n g agents and perhaps I1cheaperIi ones.

ORGANIZATION: NAME : MARSHALL SPACE FLIGHT CENTER

TEST METHOD

EH44

4 CHART NO. :

S e l e c t a v a r i e t y o f contaminants r e p r e s e n t a t i v e o f those found i n l o x systems.

ALTERNATE CLEANERS TECHNICAL EDDIE D A V I S

LOX COMPATIBILITY OF RESIDUES AUGUST 1993 D A T A EXCHANGE DATE :

Those chosen were:

DC200 P o l y d i m e t h y l s i l o x a n e S i l i c o n e F l u i d Conoco HD Calcium Grease FS 1265 F l u o r o s i l i c o n e F l u i d Zinc Chromate Pr imer TT-P-1757 M e t h y l a c r y l a t e A c r y l i c Adhesive Neoprene Rubber Adhesive B u t y l Rubber Adhesive Machin ing O i l

S e l e c t a s o l v e n t r e p r e s e n t a t i v e o f those used i n c l e a n i n g l o x systems.

Chosen were:

- Freon 113 - T r i c h l o r o e t h y l e n e

ORGANIZATION:

NASA EH44 CHART NO. :

5

MARSHALL SPACE FLIGHT CENTER

ALTERNATE CLEANERS TECHNICAL D A T A EXCHANGE

LOX C O M P A T I B I L I T Y OF RESIDUES

NAME :

EDDIE D A V I S DATE :

AUGUST 1993

TEST PROCEDURE

Test on t h e Ambient Mechanical Impact Tester by the procedures o f NHB8060.1C, Test 13A

D isso lve contaminant i n bes t s o l v e n t i n order t o p lace known d i s k

Place s o l u t i o n

weight o f contaminant on t e s t

on 11/16 i nch t e s t d i s k

A l l o w 30 minutes f o r s o l v e n t evapora t ion b e f o r e t e s t i n g

Lox impact t h r e s h o l d t e s t by q u a n t i t y impacted

Lox impact t h r e s h o l d t e s t by impact energy l e v e l

Lox impact t e s t on va r ious s u b s t r a t e m a t e r i a l s

__ ~

NAME : MARSHALL S P A C E F L I G H T CENTER 0 R G A N I Z A T I ON :

NASA - EH44 (.llr'\RT NO. :

6 _. -

ALTERNATE CLEANERS TECHNICAL D A T A EXCHANGE

LOX COMPATIBILITY OF RESIDUES

AMBIENT PRESSURE LOX I M P A C T TESTER

NOTES:

- Tes t d i s k i s 11 /16" d i ame t e r

- S t r i k e r p i n c o n t a c t s u r f a c e i s 1/211 d iameter

- Test r e s u l t s :

g i v e s 0 1 r e a c t ion

g i v e s 2 o r more r e a c t i ons

Pass - 20 drops

F a i l - 20 drops

EDDIE D A V I S I D A T E :

AUGUST 1993

Ambient Pressure Mechanical Impact Drop Weight Tester

ORGANIZATION:

EH44 C H A R T NO. :

7

MARSHALL SPACE FLIGHT CENTER

ALTERNATE CLEANERS TECHNICAL D A T A EXCHANGE

LOX COMPATIBILITY OF RESIDUES

NAME : 1 EDDIE D A V I S DATE : I AUGUST 1993

0 PRELIMINARY RESULTS TABLES

Conoco HD Calcium Grease ( T r i c h l o r o e t h y l e n e So lven t )

Quan t i t y Quan t i t y per Impact React ions / Impacted (mg) Sq . F t . (mg) Subst r a t e Energy Tests (Drops) ------------- ------------ --------- ----e- ------------

5.448 3 9 995 CRES 347 72 FtLb 14120 5.448 3,995 An AL 6061 72 19/20

2.750 2.592

1.587 1.587

0.529 0.529

0.344

0.053 0.053

2,017 CRES 347 72 1,901 An AL 6061 72

3 /20 17/20

1,164 CRES 347 72 2 /20 1 164 An AL 6061 72 14/20

388 CRES 347 72 388 An AL 6061 72

252 CRES 347 72

39 CRES 347 72 39 ". y* ' An AL ?6061 72

2 /23 9 /20

0 /20

0 / 2 0 1 /60

MARSHALL SPACE FLIGHT CENTER OKGANIZATION:

DATE :

ALTERNATE CLEANERS TECHNICAL D A T A EXCHANGE

NAME :

8 __

PRELIMINARY RESULTS TABLES

DC200 (F reon 113 S o l v e n t )

LOX COMPATIBILITY OF RESIDUES AUGUST 1993

Q u a n t i t y Impacted (mg)

5.554 5.554

-------------

2.750 2.750

0.529 0.529

0.344 0.344

0.053 0.053

Q u a n t i t y per Sq. F t . (mg)

4,073 4,073

2,017 2,017

388 388

252 252

39 39

Subst r a t e

CRES 347 An AL 6061

---------

CRES 347 An AL 6061

CRES 347 An AL 6061

CRES 347 An AL 6061

CRES 347 An AL 6061

Impact Energy

72 F tLb 72

72 72

72 72

72 72

72 72

------ Reac t ions / Tests (Drops)

16/20 -------------

7 /20

16/20 13/20

5 /20 2 /20

2 / 2 1 0120

0120 0120

LOX COMPATIBILITY RESIDUE CONTAMINATION STUDY DC 200 (200 CST) SILICONE FLUID (CRES 347 SUBSTR),

Yo REACTIVITY 100

80

60

40

20

0

10 15 20 25 30 35 40 45 50 55 60 65 70

ENERGY LEVEL (ft-lbs)

IMPACT QUANTITY

-t 5.554 mg +2.75 mg 'Af 0.529 mg * 0.344 mg ->f- 0.053 mg

CURVE GRAPH

LOX COMPATIBILITY RESIDUE CONTAMINATION STUDY CONOCO HD CALCIUM GREASE (CRES 347 SUBSTR.)

% REACTIVITY

60

50

40

30

20

10

0

10 15 20 25 30 35 40 45 50 55 60 65 70

ENERGY LEVEL (ft-lbs)

IMPACT QUANTITY - 2.75 mg + 1.587 mg 0.529 mg * 0.344 mg 0.053 mg

CURVE GRAPH

LOX COMPATIBILITY RESIDUE CONTAMINATION STUDY CONOCO HD CALCIUM GREASE (ANODIZED DISK)

% REACTIVITY

35 40 45 50 55 60 65 70 75 80 10 15 20 25 30

ENERGY LEVEL (ft-lbs)

IMPACT QUANTITY

2.592 mg + 1.587 mg 0.529 mg * 0.053 mg

CURVE GRAPH

LOX COMPATIBILITY RESIDUE CONTAMINATION STUDY

$p L

6

DC 200 (200 CST) SILICONE FLUID (ANODIZED DISK)

IMPACT QUANTITY

+ 5.554 mg +2.75 mg X 0.529 mg * 0.344 rng X 0.053 mg

Yo REACTIVITY

70

60

50

40

30

20

10

0 10

\ c

CURVE GRAPH

I

CHEMICAL SPECIES, LOX IMPACT SENSITIVITY RESEARCH (RESIDUE STUDY)

OBJECTIVE: To substantiate proposal for cleaning to a lesser degree than

MATERIALS (CONTAMINANTS): DC 200

is currently allowed by NASA.

FS 1265 Decanoic Acid (Capric Acid) Zinc Chromate Primer Adhesive Tape (Acrylic) Residue

Conoco HD Grease, Carbowax . Rubber

PLAN: EH32 will prepare solutions, contaminants in inert solvents, per our instructions, and provide us with quantity necessary to achieve proper amount per disk.

Each series of tests on these solutions will be run with the solutions applied to SS 347 inserts in standard aluminum cups, with the solutions in SS cups, and with the solutions applied to aluminum grease cups in standard aluminum cups. In addi- tion, some of the solutions will be applied to sulfuric acid annodized aluminum disks when these disks become available.

Begin with 5 mg/disk solution.

5 mg/disk: Not reactive - increase concentration to 10 mg/disk. Reactive - decrease concentration to 1 mg/disk.

tions. Reactive - decrease concentration to 7 mg/disk.

mg/disk. Reactive - decrease concentration to 6 mg/disk.

9 mg/disk: Not reactive - energy threshold 10 mg/disk solu- tion (see energy threshold section). Reactive - decrease concentration to 8 mg/disk,

8 mg/disk: Not reactive - energy threshold 9 mg/disk solu- tion (see energy threshold section). Reactive - energy threshold 8 mg/disk solution (see energy threshold section).

tion (see energy threshold section). Reactive - energy threshold 6 mg/disk solution (see energy threshold section).

10 mg/disk: Not reactive - hold testing for further instruc-

7 mg/disk: Not reactive - increase concentration to 9

6 mg/disk: Not reactive - energy threshold 7 mg/disk solu-

1 mg/disk: Not reactive - increase solution to 3.mg/disk. Reactive - decrease solution to 0.1 mg/disk.

3 mg/disk: Not reactive - increase solution to 4 mg/disk. Reactive - decrease solution to 2 mg/disk.

4 mg/disk: Not reactive - energy threshold 5 mg/disk solu- tion (see energy threshold section). Reactive - energy threshold 4 mg/disk solution (see energy threshold section).

2 mg/disk: Not reactive - energy threshold 3 mg/disk solu- tion (see energy threshold section). Reactive - energy threshold 2 mg/disk solution (see energy threshold section).

0.1 mg/disk: Not reactive - increase solution to 0.65 mg/disk, Reactive - energy threshold 0.1 mg/disk solution (see energy threshold section).

0.65 mg/disk: Not reactive - energy threshold 1 mg/disk solu-

Reactive - energy threshold 0.65 mg/disk solution (see energy threshold section).

-tion (see energy threshold section).

ENERGY THRESHOLDING TECHNIQUE: Perform energy thresholding only when i t is called out in the plan above. at 72 ft-lbs f o r each new solution. Failure at

Always begin

72 ft-lbs, go to 40 ft-lbs.

At 65 ft-lbs - fail go to 60 ft-lbs. At 55 ft-lbs - fail go to 45 ft-lbs,

pass go to 65 ft-lbs.

At 45 ft-lbs - pass go to 50 ft-lbs. At 40 ft-lbs - fail go to 15 ft-lbs,

pass go to 55 ft-lbs.

At 35 ft-lbs - fail go to 30 ft-lbs. At 25 ft-lbs - fail go to 20 ft-lbs,

pass go to 35 ft-lbs.

At 15 ft-lbs - fail go to 10 ft-lbs, pas6 go to 25 ft-lbs.

After approximate threshold level is obtained using this method, find definitive threshold level, using following thresholding method.

Begin testing 6 inches above the approximate threshold level. Fai lure at 6 inches above, subtract three inches from drop height and test again. Continue this process until two successive energy levels are found not reactive. The definitive threshold level is the higher of the two non-reactive levels.

c’

0 P G A N I ZAT I ON :

NASA EH44 C H A R T NO. :

9

NAME : MARSHALL SPACE FLIGHT CENTER

ALTERNATE CLEANERS TECHNICAL EDDIE D A V I S

L O X C O M P A T I B I L I T Y OF RESIDUES AUGUST 1993 D A T A EXCHANGE DATE :

- -

PRELIMINARY CONCLUSIONS

Contaminat ion l e v e l s o f 1 .0 mg/sq f t appear t o be t o o conserva t i ve .

Much more t e s t i n g i s needed be fo re t r u e conc lus ions can be drawn.