Document pmyNZZ1Xr6a0b9dj5mrkX75Yk
Biochemical Research Laboratory Ihe Dow Chemical Company
Noted E. E. D. J /
JUN Ob 1958
RESURVEY OP BENCH HOOD, BUILDING PRODUCTS SECTION, COATINGS TECHNICAL SERVICE, 433 BUILDING
File Chg. Date
By:
T2.1-1-65^)
1219 4-18-58 J. E. Peterson
Signed Date
Checked i Date
PROBIEM
THIS REPORT IS THE PROPERTY OF
THE DOW CHEMICAL COMPANY .
Ihe bench hood In the Building Products Section of Coatings Technical Service, 433 Building was surveyed on 1-15-58 (See report. File No. T2.1-1-65, dated 1-22-58) and found to be inadequate. Investigation disclosed that the hood fan had been installed so that it ran backwards. This was corrected and a resurvey of the hood was requested.
ST0000026
CONCLUSIONS
Ihe average face velocity found for this hood on 4-11-58 was 66 fpm with the door wide open, as compared with a recommended velocity of 80 fpm. A face velocity of 80 fpm or more would be assured if a stop were installed so that the hood sash could not be opened more than 25 inches. This procedure is recommended.
Biochemical Research Laboratory T2.1-1-65 Page 2
PRESENTATION OF DATA
On 4-11-58 the bench hood in the Building Products Section of Coatings Technical Service, 433 Building was resurveyed. Results of this survey are presented on the "Hood Survey Data Sheet" included with this report. The figures'shown on the sketches of the hood face are air velocities in lineal feet per minute (fpm). The mean face velocity with the sash wide open was found to be about 66 fpm.
After considering the toxicity and inhalation hazard of materials; handled within the hood, the sources of externaland internal air disturbance at the face of the hood, the size ofthe hood, and the variance of face velocity data, the recommended face velocity was calculated to be 80 fpm. At an average volumetric air flow rate of 920 cubic feet per minute (cfm), the sash opening to produce a face velocity of 80 fpm was calculated to be 25 inches.
According to users of the hood, the sash is rarely raised all the way, and therefore, if a stop were installed so that the sash could be raised no more than 25 inches, the hood should be satisfactory in all respects for present uses.
ST0000027
HOOD SURVEY DATA
wtTHumr
TOC5s<r5uSzr
>Mk-. M-3M-2U.a' TIBm-
TtH it *
AAQ DSSSC#
p/AJi- Peoot/crJ AASQXArtAY* CTJ
tmrvutM. lA#n.r
CATffttUU. AAAFLiT
CNCMKALS HANOCCD W THIS MOOD
Yes
MO
ASDfSTdA, PJL, PiASTJCrttAS
BThii 'iaaweawgTB ra TuruurnuujiT hitl.
erCj sojjvwrs
1BCX&*a> J
IVTU.UL'Te TtBTMBBg----------------------------------------------------------------------------------------------------------------------------
IIUAKi*I hj/rrvsee /AJLtr AGOUT ? fT
1-KSMT OF tt-QOQ.
/1/UtrtAi. a reAPF/i.to as
________________________________________________________________________________________________
RECOkMEFCEO MEAN FACE VELOCITY FOR TH HOOO_____
ucqhhccco exhaust rate for this hoop
//(TV
JLCL
CF.lt
f. p. M., DOO* OPCN.. .A lY'-
ii
M1 ;
| i
i 1 11
11
1'
;1
i !i
!
i1 i < 1
i'll ` J
11 11
11 If
II !i
ii
1,
i ' J______ l!
11
i
!I
i
' 1!
.1
: ' 1 i 11 1 1 1 i ! !' M! :|
,
^A1 'IT
. i | | i| i
cp-v
1 7*7 1
1 ; /l \ 1
1 ii
1
;
: if j!1
i !,,
:,
i | 1 !> J
!!
.
i ST) i
ieO
I1
; i * 1 I i l i 1 -j
/ r\ 10KJ
: : i1
!; .
;:
; j'
1
. j j j : i ; ; : : ; ri i i i
^Z>
tro
r~~>
!;
;i
'i i :,:i \ `J! 1
\ i
' I
1 |
in___________________ ___________i A ______ ______ !__________________Q/VJ______L
1C-
1 '
1
1
*r
L-- 1
1'
111 ______ _____________ 1
!I
`' 1
j 1 i [-1 1 ^
1! i ol 1 1 ^i --------- j-------------& ! , CD
CD 1 t--> i fNJ
;
11"-
HOOD CONDITIONS DURING THE SURVEY
ACTUAL FACE VELOCITIES HOOO FACE AREA DURING SURVEY EXHAUST RATE DURING SURVEY MAXIMAL OPENING* HEIGHT. .jft'kr..
MAItHUM
. 10..._FJ>Jt
IUMIHUH
_F.FJt
HCAM
JtjJl--F.FjL
t3 \ 7__SO. FT. P CFJt
l*C. WOTH L 1 IN. MAXINLM HOOO FACE AREA _ n.i
VARUNCC
so. rr.
IMSTtUMOtT UUO HM Ail VftOCTT HlAlMlllllMTS
SI RIAL MUM!Cl
AVgMorPC^M___ A1A_______yi F TER_____________
C- UM miTtl H l.ti. !?
subvctoi
_
c)' (' ft_________
HOOD SURVEY DATA
rrrnmii--------------------------------- UP.6IMC mSRI
TJ.hJ-Al'
Nod& LOCATION, OcLgmaHON
3 2
Ml W HS--
QSrtcrt________________________________________________
8u /i d/a/6- PpqdUcts a a*a pa rap Y, crs_________________________________________________
IVTIIMiL AAAn.
CXTCMNAL lAAFLC?
CNCMICALJ MAMDCCO M THIS HOOO
Uxitcil W aJI 1MJTUAIam1 liTElMAl T5 TWi mUC
IfMAJKS
U___________* 1ft HAL
q?*JiN6`"
/ RECOMMCWCO MEAN FACE velocity FOR THIS HOOO F.P.M., DOOR OPENIN.
RECOMHEMOED EXHAUST RATE FOR THS MOODC. F. M.
T1 1! ' fiI li l!
i:,
I i ! I T~
l
-
i
: ;
1i ;
i ; :
( !1 :
l
1
! !
I ! 1
1 ! :
1 1 i 1i 11 1 L1iM| : :M! l! !'1 ' ;11 I!J_______ 1
___________ _____ _____ ______ (1
1|:!1
i | :
/
1
! :
1 ____ _ _ _ _ _ r\
1
!
;
1
1
i
'
:'
:
'
:1
i
:..
.
;..
;.
; !
lL1 ' 11
i
'
i
t1
'
t
tt
. fC
l/il
iSS
' : ;
JS0
,
i
/J,3
I :
1
1 1' 1i 1 11 i- M
j , 1 j!
-
-
1
-
-
1 1tn
--1
1--
i
CD !
CD
CD
IZ
> no /20/3o
:________________________________________________________________________ 1
r-^i 1 !
--------------------- ----
>/--I
HOOD CONDITIONS DURING THE SURVEY
ACTUAL PACE VELOCITIES HOOO PACE AREA DURING SURVEY EXHAUST RATE DURING SURVEY MAXIMUM OPENING: HEIGHT.
MAXIMUM
MINIMUM
ISO F.PJL
7.if SO. FT.
__25--- f.Pm.
9.*11... C-F *
JtlIN., WtOTM.
_____ _ IR UAJC1UIM HOOO FACE AREA _
MCAM
ILiS
/3. 7
VARIANCE
SO. FT.
IMTRUMCNT USCD ROM AIR VtLOCITY MfAWtM|MTl
1CRIAL NUMB Cl
AVfMOTtff* PI A/P rtfTJTP_____________
CMIM Rttrrtl II .UA. !'
&URVCYDR
S.______ J-.
fc_________________
I am an author of and have raad this raport comprising
3
pagas with______\pages of drawings, photographs, graphs, and
checked the data herein against the original entries under Biochemical Laboratory File Number________ ^ ^
Pat. //jf/rP
/
Date
I finished typing this report on4-22-58
comprising 3
pages and placed therewith2pages of
drawings, photographs, graphs from an original draft given me by--------------
J. E. Peter3onon 4-18-58.I
I have pieced in the plant mail4copies of this report for
transmittal to please refer to the distribution list of this report.
Signature,
J Date
rr
ST0000030
PPttrTEC rN 'J.S.A.
Biochemical Research Laboratory T2.1-1-65 Page 3
UNIT INDEX
The bench hood in the Building Products Section of Coatings Technical Service, 433 Building was resurveyed. The average face velocity found was slightly less than that recommended, but this inadequacy could be easily corrected by installing a stop so that the hood sash could be opened no more than 25 inches.
DISTRIBUTION
R. B. Drubel, Coatings Technical Service, 433 Building N. R. Peterson, Coatings Technical Service, 433 Building H. H. Gay, M.D., Medical Department, 607 Building W. L. Tisdale, Safety Department, 401 Building
g*
eooooois
SZ000001S