ML19317E479

Rept of Testing of Two Atmosphere Supplying Suits.

ML19317E479
Person / Time
Site:	Oconee
Issue date:	10/12/1973
From:	Davis T, Lowry P, Moore T LOS ALAMOS NATIONAL LABORATORY
To:
Shared Package
ML19317E464	List: ML19317E463 ML19317E479
References
NUDOCS 7912180725
Download: ML19317E479 (10)

Text

a.- ~

~

. ~.

...x~ .

i. .

g u f.

nmemnpn .

ofn@ousceggyb.

W RCPORT CF TESTI:!G OF TiiO ATMCSP!!CRE SUDPLYI!1C SUITS Performed by Thomas O. Davis, Jr., P hilic Lo',. r ' , and Tom O. Moore Respirator Research & Development Section Industrial Hygiene Group Los Alamos Scientific Labcratory University of California

. Lo s Ala:r.c s , leu Mexico 87544 October 12, 1973 9

I912180726~

4 (?g EUN000

$/.,,'qg NUCLEAR SA. ETY pu 4180 ELMWCCD AVE EUFF;60. NE'N YOR K 1421:',

4 Ail \\ AREA CCOE 715 577 553,,

i,>,.. ., .

. .s I. Te n t iner Procclure >

All tests were carried out in LASL's respirator fitting chamber.

The challenge aerosol was a polydisperse Dop aerosol, 0.75 pm '

aerodynamic mass median diameter ( M".MD ). . The cercsol detector *as a LASL forward light scattering photometer. Penetratica samples were taken from th6 breathing region inside the. hood.

Suit internal pressure uas taken at the upper chest level. Suit pressure uas indicated by a validyne ultra-lou dif f erential pressure sensor, uith one pressure tap scaled and the other pressure tap con-nected to the suit chest region. The pressure sensor was not calibrated, but was used to indicate relative pressures.

Three internal air temperatures were recorded. The locations were; upper chest region, forearn, and mid-calf. The leg temperature was taken from the leg being cooled by the leg air tube. The tempera-ture sensors were Yellow Springs Instrument Company's thermistor ther-mometers. The thermistor probes are designed to measure air tempera-ture only.

The supply air ficwrate was measured by an orifice meter tube with a Magnehelic as the readout. The orifice tube was calibrated by connecting the tube output to one of the suits, placing the suit in a sealed container, and measuring che cucpat fr:m che container. Cali-brations were made for each integer flourate frcm 1 to 10 cfm inclusive.

The calibration for each flourate was made approxi'mately 0. 3 cfm high-er then the integer flourate recordsd in order to compensate for the penetration sampling flowrate. The supply air was 73'? and 5% rela-tive humidicy before entering the suit.

A series cf exercises was performed by the subject at each tested flowratc. The exercises were chosen as being basic body movements.

Other movements can be taken as combinations or refinements of these movements. The exercise series was:

1. Stand, arms at sides

2. Bend at unist, touch toes

3. Run in place, lifting knees high (to simulate climbing lad-ders and stairs, and a heavy workload)

D" i'D fb @bj

~

Ti A W h _,

N

1GHt a t:as ab.o ve head , low'r atus

~

1. -

a

5. Lock-hands .. front of chant, twist tu..so from side to side

6. Stand, arms at sides The c::ereisen verc per Cormed in the order l i s t.c d . Each e::ccci se was performed for one minute, or until the leak indication stabili.:ed.

If a leak occurred during an exercise, a purge time was allowed before beginning the next exercise. The purge time lasted until the leak in-dication returned to the sedantary leak levels for that flowrate.

II. Aerocol Penetration Test Results .

Table I gi9es the percent penetratEons for the tests on the Sny-der suit. A "T" in a box indicates general penetration levels were so high that the test was terminated to reduce the subject's exposure.

Table II gives the percent penetrations for the testr en the Mound bubble suit, without pants' suspenders.

Table III gives the percent penetrations for the tests on the Mound bubble suit, uith pants' suspendars.

The testing shown in Table III was performed because the opera-tor observed that as the pants of the Mound suit rode lower as ex-ercises continued, th"e penetrations increased. Cord suspenders were e made which held the. waistband of the pants as high as possible.

Tests uhile using suspenders were made, as shown in Table III. Table III does show louer, and less erratic, penetrations.

ras saan l

[

l l

l l

9 2

e- .e e *,

. . A. . Snydce Suit , ,

\

The suit unusd not hold any pressure.

While the subject was standing still, the pressure sensor uns zerocd at each flowrate.

The bending exercises showed sudden pulses from nero to ~ 3 " o f !! 0 h 2

pressure. This may have been kinking of the probe line. But, bend-ing always showed hfjh penetrations, so rapid pressure pulse may have been aiding acrosol dispersion.

B. .

Mound Suit- li.e3 2 6e l The pressure inside the suit at chest level never vent nega-

. tive. The amcunt of positive pressure depended on the flowrate. The amount of positive ' pressure at a flowrate could be reasurably les-sened by the subject's normal inhalation even at supply flourates as ~

high as 8 cfm.

IV.

Internal Suit _Temoeratures Table IV gives the temperature results for the Snyder suit tests..

Table V gives the temperature results for the Mound suit tests.

V. Subject's Cor.ments i

A. Snyder Suit

1. Pants suspenders, good.

2. Shirt tie-downs, good.

3. Draustrings at pants and shirt waistbands, not good; would not draw tight enough.

1. Air delivery system very annoying, air. j et directed at right eye, causes severe headache after one hour.

5. Arms and legs receive virtually no cooling.

Inside of suit, arms and legs covered with condensed sweat after one hour of testing.

B. Mound Suit E us . i fe : > ,

. 1. Pants and shirt clastic unistbands, gccd. .

2. . Shirt needs' tie-downs.

3. Suit uncomfortably inflated even at low flowrates.

4. Air delivery system irritates cyes and ears. Suggest scme kind of baffle to keep air jets cut of eyes.

5. Arms and legs receive virtually no coolit.g.

Inside of suit, arms and legs covered with condensed sweat at the end of one  ;

hour of testing. .

3

___J

V P., Mult Comoarison . ~

3 .

A. Aerosol Peneeration ,

The Mound bubble suit, with pants suspenders, has lower an'd Icss crratic penetrations than the Snyder suit or the Mound bubbic suit without pants suspenders.

'B. Internal Pressuro

- The Mound bubble suit always maintained'a positive internal pressure. The Snyder suit never shoued a measurable' positive internal pressure. '

C. Internal Temperature ,,,,

s Both suits maintained a fairly constant chest region tempera -

l ture. Neither suit provided effective cooling for the extremities.

VII. Reccmmendations The Mound bubble suit with pants suspendars provides the better l

l protection of the two suits tested. The Mound bubble suit had the i

better wearer response of the two suits tested. Internal temperature of the suits was comparable. Therefore, we recommend the u'se of the l

Mound bubble suit with suspenders to hold the pants waistband as high

as possible.

Y #

9 l

D 6

e e

e d

6 i 9 i

1 i

e 4

. A

Table I .

PERCENT PEIETRATIO:1 vs E:CRCISE AT VARIOUS FLC'.1 RATES : St!YDER SUIT Flow Ratcc (cfm)

Exercise 1 2 3 4 5 6 7 8 9 10 Standing T 0.01 0.003 0.001 0.02 0.01 0.001 0.001 0.001 0.00 Bending 2.0 1.5 3.5 1.0 1.1 0.23 0.50 1.0 1.3 Running T T 1.5 1.6 4.8 1.0 1.5 0.2 0.55 0.02 Lifting arms T T 1.0 1.2 0.9 2.4 0.45 0.4 1.3 0.32 Twisting T T 0.5 6.0 0.22 1.9 0.12 0.3 0.17 0.02 Standing T T 0.005 0.001 0.02 0.013 0.001 0.002 0.001 0.0(

Purge time from maximum leakage

(?Iin) T >2 1.5 1.5 1.0 1.0 1.0 1.5 1.C 0.5 0

wes + R A =

1 I.

.i

--+ . - . .

'.'. T

• . e -

1 e ., i -

, H H H H H H O O O O O O O ".) O O O C O c4 . . . . . . I O O O O O C r-4 O &. m e-4 H

.. O N O Lo O O O O O O O O m . . . .. .

O O . .O O O O N j v er T =1- to V O O r-4 O O C.

O O O O O O C3 . . . . . . ..-

tn O O O O O O H .- .

D.-

N O e-4 N

, Z O N I.3 O O A N .

• I I I to O C D

to Id n v m 4

to C-4 O N v o HD O O co o OO c . .

• I I e o

!  % ::: O O O O c-4 W E- .O HH n EQ O c4 LS v H N e4 C 1 - O O O O O O r4 i 01 i G O O O O O O F.

> W G . . . . . .

l L.4 i C E< U O O O O O C o H4 ZH w 4J HuODH (D L7 *? LA c

t i D.s & C O O O C H 'O~ M. O m O O -ci

,a vs n v . . . g l .

tri c7 E- 5  % C O cc O v e agao 22 3 u

o W O N H '7 v m 3 4** M O v c-4 O O C (D N O O O O O C L1 E Ca m . . . . . .

tp C Em O O O O O C m

• C ta .

.4 -

O '

'O

,% H v b v N N c t.; 3 O H H O C C O AC O O O O O O t.9 54 3 N . . . . . . .

tu o O O O O O H L1 O

LA 4J D c-4 d O O O H C C3 O tt) .-4

.  % c-4 . . .

[a (-4 Ea .

'O 4

4 O- r-4 H E m C

> O e4 k4 E4 c1 'W -

4 C C C C 0m I ti c. EG

~ O CD CD *4 M ~

() C tp CP & C C Mc j

L .-4 C C C .*, . e o "J t -4 -4 -4 a o oH- ..

P. C t U- L1 'O . tp C 0 W d C C W -e G La "A -* M U .U' ~3 r4 ' 3 D CM2 O t/J C3 % 4 Ed th- A E- O k.

s

- -- , - . ., - , , . , , , < - - - ,4-9 -w

. ' TABLE III t_.r4 5 - I T h e>

PERCENT pet 3ETPATION vs' EXERCISE AT VARIOUS FLOM RATES: MOUND SUIT - WITH SUSPENDERS Flow Rates (cfm)

~ Exercisc 1- 2 3 4 5 6 7 8 9 10 w

t' }

Standing T 0.002 <0.001 0.001 0.002 0.002 0.001 0.001 0.002 <0.001 Dending' T 0.004 0.19 0.003 0.032 0.004 0.002 0.011 0.003 <0.001

,i Running .T 0.2G 0.16 0.015 0.013(.0.006 I 0.003 0.002 0.002 <0.001 Lifting arms. 0.005 0.004 0.004 Twisting 0.005 0.004 0.003

' Standing 0.002 0.002 0.003 9

't Purge time from-ih-max leakage (Min) 1 1 0.5 1

0 i . .

i 3

e 1 1- a ..

i t

~

y7, _

i'

$![

e.

~ ':

. TABLE IV '

%j~ ': .

+p 1[y AVERAGE TEMPERATURES ('F) DURING EXERCISES AT VARIOUS FLOW RATES: SNYLER SUIT

'i'.

Q* . . Flow Ra tes (cfm) si Exercise 2 3 4 5 6

... Arm Leg Chest Arm Ley Chest Arm Leg Chest Arm Leg Chest Standing 86 81 81 82 78 Arm Leo _C h 80 82 82 77 84 75 Bending 79 80' 75 88 82 82 82 78 81 82 80 80 85 77 79 Running 80 77-83 79 82 78 75 80 85 76 80 80 76 Lifting arms 82 80 82 79 76 79 84 75 79 80 74 Twisting 85 78 81 80 76 79 85 75 78 SO '75 Standing 85 78 81 79 76 78 84 75 79 80 75 Flow Rates (cfm) 't Exercise 7  !! 9 10 y Arm. Leg Chest Arm Lcq Chest

' Ann Leg Chest Arm Leg Chest Standing 80 74 77 ,82 74 78 88 78 80 87 76 80 Bending 82 77 79 82 76 78 87 78 80 87 78 80 Runnir3g 83 74 79 81 76 78 90 79 80 88 79 80 Lifting arms 82 74 78 80 75 78 88 80 80 89 77 80

. Twisting 81 74 78 82 76 78 85 77 80 89 78 80 Standing 82 74 76 82 77 79 85 77 80 80 77- 79 k:

F

, , _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ - - l *' 'I '-

r l

l

- TABLE V (ens - t T6 ol AVERAGE TEMPERATURES (8F) DURING EXERCISES

{

i AT VARIOUS PLON RATES: MOUND SUIT Flow Rates (cfm) 3 4 5 6 Exercise 2 Arm Leq Chest Arm Leg Chest Arm Leg __ Chest Arm Leg Ches Arm Leg Chest 82 83 86 80 78 80 78 83 84 80 Standing 88 83 82 89 86 83 83 84 80 79 81 79 83 84 81 Ben < ling 87 83 83 89 86 84 83 82 82 80 80 80 83 83 82 Running 87 82 84 90 85 87 83 82 84 Bl 80 82 80 82 84 81 Lifting arms 86 84 83 89 90 85 83 82 84 81 82 81 79 82 83 '81 T.iisting 87 83 83 83 83 84 81 81 81 79 83 34 30 Standing 88 85 83 90 86 i

Flow Rates (cfm) 7 8 9 10 fT Exercise Arm Lcq Chest Ann Leq Chest Arm Leu Chest _

Arm Leg Chest ,

82 8'4 84 80 88 83 80 82 80 78 Standing 88 83 82 83 83 80 88 83 8l 84 81 79 -

Bending 88 83 84 82 81 88 83 82 85 80 80 Running 88 84 83 03 84 81 88 84 81 86 84 79 Lifting arms

"~

84 82 82 82 84 81 90 83 81 86 82 79

, Tuisting 89 83 81 84 82 81 90 83 80 86 81 79 Standing 89 86 9