A low-cost water seal fumigator

MISSING IMAGE

Material Information

Title:
A low-cost water seal fumigator
Physical Description:
Mixed Material
Creator:
Johnson, A. C ( Alpha Cornelius ), b. 1889
United States -- Bureau of Entomology and Plant Quarantine
Publisher:
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine ( Washington, D.C )
Publication Date:

Record Information

Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030345420
oclc - 781634958
System ID:
AA00017457:00001


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Full Text
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ET-154 January 1940

United States Departmcnt of Agriculture
Bureau of Entomology and Plant Qua-antine


A LOW-COST WATER SEAL FUrMIGATCR

By A. C. Johnson, Division of Control Iivc'stigations



The fumigator described here was origii,.ally developed for
use in fumigating small lots of cotton samples infested by the
pink bollworm (Pectinophora gcssypiella (Saund.)). More recently
it has been used for treating other co-mmodities, such as vetch seed
and string beans, for fumigation data, ?and its performrr.-:r.ce has been
satisfactory. Both carbon disulfide and methyl bromide have been
used in this fumigator. A number of fumigators have been built and
used by various investigators.

Construction

The container is constructed frcm a 50-gallon oil drum; the
top is removed by cutting arour.d the rim and then smoothing the
rough edges.

The water jacket or collar (figs. 1 ar.d 2) which surrounds
the upper part of the drum is m.rde of 20-gauge galvanized iron.
A I" flat fold is made on the edge designated as the top of the
collar. The ends are brought together, overlcjping !", and then
riveted and soldered. The rivet heads are placed on the outside
of the jacket to provide a smooth surface within. The bottom of
the collar is then crimped, placed in position, and soldered to the
drum.

The cover (figs. 1 ar.d 3) is also constructed of 20-gauge
galvanized iron. The piece forming, the rim should fit loosely
around the drum inside the jacket, and the nr.d3 are brought together
and fastened by loose laps. The bottom of the rim is crimped
inward in order to strengthen that portion. A -" ri-ht-angle flange
facing outward is made at the top of the rim.

The top part of the cover is a disc made of 20-gauge gal-
vanized iron, with a 3/16" loose fold formed around the perimeter,
in which the right-angle flange on the rim is fiticd. All seams
are then rolled and thoroughly soldered.

A 2" tubulature of 20-gauge galvanized iron is made with a
lap joint on the side and flar.ged at the bottom. This is fitted










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into an appropriate opninrg in the center of the cover and soldered.
It is flared slightly at the top to acccrmodate a rubber stopper
of the proper size.

The -.andles are made of 24-gauge galvanized iron. The
pieces are folded on the sides, bent into shape, riveted to the
cover, and soldered to prevent leakage.

The evaporating pan (figs. 1 and 4) is xrrcce of 22-gauge
galvanized iron about ICt" square and 1" deep. Steve bolts 2'-"
long by 3/16" in di.m.eter are used to fasten the pan to the inside
of the cover. Holes are first made near each corner of the pan
through which the stove bolts are fitted and soldered, the bolt
heads being under the pan. Holes are then made in the cover
through which the bolts can pass. Before fitting the evaporating
pan to the cover, single nuts are run down to a distance of 2"
from the bottom of the pan. The bolts are then passed through the
holes in the cover and securely fastened by outside nuts, which
are then soldered in place to prevent leakage.

Operation

In order to operate the fumigator, water is introduced
into the jacket until it is about three-fourths full. The cover
is then placed in the jacket and permitted to settle to its resting
position. In order to test for leakage the cover is raised an inch
or two, and when in that position the stopper is inserted. If no
leaks occur the cover will remain in the some position indefinitely
except for movement caused by expansion or contraction of the gas
within the drum. In using this apparatus for fumigating, the load
is placed inside the drum, the cover is applied, and the fumigant
is poured through the tubulated opening into the pan beneath. Dur-
ing the vaporization of the fumigant the added gas pressure with-
in will cause the cover to rise. This arparatus makes a tight
and effective fumigation chamber for small quantities of material






PLANT QUARANTINE &
CONTROL ADMINISTRATION
TECMNOLOOICAL DIV.
A.C.JOHNSON 1932
601.9 37-t,2.


WINTER SC/AL
DRUI M FU/I GA TOR.


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SKvrPOATINS ANv z ,-


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Watt,'T Jac/qet

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.3t0 1.- so7ts (4)
So0ired to Cort-e and
fo o ratLz. Pan


f/MIGrtTOR COr LR
With raporatilj Pdan
ATttached Ldrneath.


in Coat o t"r
ECr'apra't&n rlR to Corer


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Figure 1.-Details of the water seal drum fumigator.


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ShoMiiq Location of
SufooiO'Yij.y Bo ts





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Digitized by the Internet Archive
in 2012 with funding from
University of Florida, George A. Smathers Libraries with support from LYRASIS and the Sloan Foundation


http://archive.org/details/lowcost00unit










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Figure 2.--Fumigation drum showing
water jacket attached.


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Figure 3.-Top of cover showing
handles and opening for
introducing fumigant.


Figure 4.-Under side of cover
showing evaporating pan.




UNIVERSITY OF FLORIDA


3 1262 08537 1077




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