US1883076A - Tank roof - Google Patents

Description

Oct. 18, 1932. J, A STQUGH y 1,883,076

TANK ROOF Filed May 2l, 1.928

I N VEN TOR.

Jqy Sway/7 BY am ATTORNEY Y Patented Oct. .18, 1932 UNITED STATES PATENT orFlcEv JAY A. STOUGH, OF TULSA, OKLAHOMA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE PHILIP CAREY MANUFACTURING COMPANY, A CORPORATION OF OHIO TANK ROOF Application filed May 21, 1928.

My invention relates to oil storage tanks and more particularly to roofs for such tanks, the present invention constituting an iinprovement over my prior application, Serial No. 245,602, filed January 9, 1928, and having for its object the sealing of the tank against leakage of gases emanating from the contained liquid, and the collection and conductance of static electricity and lightning from the roof, thus preventing ignition of the contents of the tank.

Further objects of the invention are to provide a conductive covering for insulating roof strips, and to connect the edges of metallic strips conductively.

In accomplishingthese and other objects of the invention I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawing, wherein:

F ig. 1 is a vertical sectional perspective view of the upper part of a tank wall and a part of the roof structure.

Fig. 2 is an enlarged fragmentary sectional view of the tank roof especially illustrating a metallic conductor connecting the adjoining strips of the upper metallic layer of the roof.

Referring in det-ail to the drawing:

1 designates an oil storage tank constructed in accordance with common practice and including my improvements hereinafter described,

The tank comprises a metallic side Wall 2, fitted at its upper end with an exterior metal 2 ring 8 having an outwardly extending hori* zontal flange 4 to receive the outer margin of a roof covering 5 including a plurality of layers presently described.

Posts 6 are attached to the inside of the walls 2 for supporting beams 7, and girders 8 are supported from the beams and from a pillar (not shown) located centrally within the tank, the pillar being of greater height than the tank walls for producing a convex roof.

Serial No. 279,389.

Sheathing 9 laid over the girders 8 provides a. convex floor surface 1() extending from the walls 2 to the apex at the center of the tank, and the roof covering 5 supported on and attached to the sheathing by nails 11 is built up in the following order.

A layer of fabric roofing material 12 preferably asbestos, is first superimposed on the sheathing and over the ring flange t, and a cement coating 13 impervious to water and gases is spread over the fabric element. An overlying layer of insulating material 14.-, preferably of cellular material, such as celotex, of sucient thickness to provide insulation from the sun rays, is applied to the cement and thereby sealed to the fabric. A second cement coating 15 similar to the coat 13 is applied to the top surface of the celotex. On the cement coat l5 is applied a preferably composite layer of rooiing material 16 comprising parallel strips of asbestos 17 having an outer metallic skin 18, the strips being overlapped as indicated at 19 and sealed to the celotex by the cement 15.

A metallic sectionally constructed annulus 20 overlies the outer portion of the roof covering, the inner portion of the annulus being sealingly connected with adjacent asbestos strips 17 by asbestos fibrated, flexible cement 21, Fig. 1.

The outer portion of the annulus l20 is secured to the flange 11 of the ring 3 and conductively connected therewith by bolts 22; and lag bolts 23 secureI the inner portion of the annulus to the sheathing, the bolts 22 and 23 extending through the intervening roof covering elements.

In order to conductively connect the metallic skin surfaces 18 of the strips 17 at their adjoining edges and to connect the strips with the annulus 20, a conductive substance-24, comprising a heavy coat of aluminum or other suitable material is applied over the joints of adjoining strips and over the adjoining edges of the annulus and adjacent strip,

thereby uniting the strips and connecting the annulus conductively thereto, and 'forming a continuous metallic surface for the tank.

y The insulating elements ct the root provide 5 means for retaining gases, fumes and vapors and are respectively adapted for resisting deteriorating iniiuence ci sun rays and vapors and are relatively non-conductive to elec tricity. lo Themetal covering serves to collect static electricity generated above the root and to conduct the electricity to the ivall of the tank which is conductively connected to the ground, thereby eliminating the danger of ,15 ignition ofthe contents ot the tank by lig itning, and ignition ot' escaping gas by static sparks.

What I claim and desire to secure by Letters Patent is: Y Y 2n l. In a tank, a root for the tank including overlapping` metallic strips, a plastic substance conductive to electricity 'tor sealing joints between strips, and means tor conductively grounding the strips.

, 2. In a tank, a root for .thetank including Overlapping metallic strips, a` plastic substance conductive to electricity for sealing joints between strips, means for conductively grounding the strips, and an insulating cov- 30 ering belenT the metallic covering for insulating the metallic covering trom the interior of the tank. l Y

3. In a tank, a root for the tank including overlapping metallic strips, a plastic sub- .nstance conductive to electricity for sealing joints between strips, means for concuctively grounding the strips, a. cellular material for insulating the metallic covering` from the in? terior of the tank, and means for sealing the cellular material from the contents of the tank.

4. A structure having a roof including sheets of ibrous roofing having a metallic skin, a grounded metallic edging member at the edge of the roof, and a plastic substance conductive to electricity ior sealing the joints betweenadjoining sheets and between thc sheets and the edging member.

In testimony whereof I aiiiX my signature.

JAY A. STOGI-.

Images