US20050269335A1

US20050269335A1 - Grooved rolled threaded flange

Info

Publication number: US20050269335A1
Application number: US10/881,139
Authority: US
Inventors: Sudarshan Saraf
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-21
Filing date: 2004-07-01
Publication date: 2005-12-08

Abstract

A grooved rolled threaded flange of special grooved geometry (101) consisting of a grooved flange outwardly extended within this grooved a gasket (102) is housed of special grooved geometry which is placed between the drum top (103) and the grooved flange the gaps (104) towards the top is filled up by the gasket while tit moves upward thereby sealing the flange with the drum top.

Description

1. FIELD OF INVENTION

The invention relates to grooved rolled threaded flange of special groove geometry for drum top. More particularly the invention relates to leakproofness of grooved rolled threaded flange of drum top on drop test.

2. BACKGROUND OF THE INVENTION

2.1] The TITE SEAL GRT flange is unique because it is the only single gasket design with the special base geometry.
2.2] It is unique because it is the only single gasket flange supplied with both gaskets of the same material.
2.3] There is no chance of having compatibility problems that can potentially cause contamination of the contents of the drum.
2.4] The TITE SEAL GRT flange is unique because there is no change while die insertion tooling or adjustment or production slowdowns.
2.5] The Tite seal GRT flange has been sold to drum manufacturers in Europe and Asia.
3. Present System
I] Conventional flanges have flat surface on octagonal face, toward cylindrical wall of the flange, the flange gasket is fitting on this side.
II] Conventional flange which has a radius, which is formed during press operation (cupping); has a effect to shift (slide) uneven the gasket upward;
III] When flange is inserted by pressing the flange in drum top this gasket can flow in both directions, i.e horizontally towards octagonal edge and or upward along the cylindrical wall i.e neck of drum.
IV] Portion of the gasket which flows in the horizontal direction has a little contribution towards preventing leakages.
V] The portion of gasket going upward along the cylindrical portion is desired to climb upto portion where neck of drum top and flange neck i.e. cylindrical portion which does not curl are straight and nearly touching each other.
VI] While drop testing the drum is hold such that the chime portion which is near flange is facing downward, and by impact drum top it tries to bend and the flat octagonal portion of the flange and drum top sheet try to go away from each other since drum top gets bend inward; this creates a situation where flange gasket loose pressure and its sealability as it is no more filling the space between flange and drum top.
VII] This can be achieved only if gasket is prevented from expanding horizontally and thereby forcing the seal to move upwards along the cylindrical portion.
VIII] The inventor has tried to provide a groove on the flange base as shown in FIG. 2; this design will provide following features.
IX] All synthetic gasket material normally used are for drum closures such as white EPDM, black Buna can be made to flow up in the desired direction irrespective of their friction co-efficient. Therefore gasket compatibilities with chemical content of fluid in drum is superior as compared to dual gasket or stepped gasket configurations.
X] Plain cylindrical gasket which can be satisfied by economic process by extrusion can be used. So special steps need to be moulded.
4. Special Geometry
4.1 Special geometry groove makes it difficult for flange gasket to flow towards octagonal edge and the GRT flange gasket under pressure now can only flow out in the upward direction along the cylindrical wall toward the neck of drum top and bend portion of GRT flange, which clamps the neck of drum top;
4.2 Additional Benefits:
1] GRT Flange is manufactured by technique of rolling threads which makes it stronger.
2] The bend of the base makes GRT flange acceptance to those drum manufacturers, who are using thick base. These manufacturers can switch over to GRT flange without much modification in insertion tooling, particularly chutes.
3] The leakproofness avoids use of extra gasket thereby making GRT flange more competitive;
4] Use of smaller gauge of steel going in the manufacture in GRT flange helps in weight reduction and higher utilization of steel thereby global benefits in conserving steel resources.
5] Special shape also adds to rigidity and stiffness of base.
6] Rolled Thread Grooved Flange as per sketch A is specially developed by TECHNOCRAFT INDUSTRIES (INDIA) LTD. To enhance safety and is particularly useful when hazardous chemicals are to be transported.
Special base Geometry not only imparts additional stiffness but drives gasket upwards when flange is inserted in a container top. This causes gasket to get lodged between drum head flared wall and flange neck shown in sketch B. In case of a crash if drum sheet were to separate from flange base, leakproofness shall be maintained by gasket as it sketch D unlike condition sketch C where gasket is no more able to prevent leakage as in conventional fitting. It is not necessary for gasket to be of dual materials. The entire gasket can be of any desired material, which is totally compatible to chemical filled.
There is no tooling change or adjustment requires to be done by drum manufacturer. The analysis of test experiment shows the performance of grooved flange has maximum vertical flow compared with horizontal flow of grooved flange and/or of horizontal and vertical flow in conventional flange.
Observations are tabulated in the enclosed sheet.

6. OBJECT OF THE INVENTION

The principal object of this invention is to provide leakproofness of the drums by rough handling simulated as in drop test.
Another object of the invention is to provide a specially designed flange for the drum top wherein the gasket is provided in between the flange and drum top which extends vertically which is a desired flow instead of horizontally.
Still further the object of the invention is to provide a roll threads inside the flange.
The further object of the invention is to provide less amount of material, saving of material thereby economy in the manufacture of the drum top.

DETAIL DESCRIPTION

The invention will now be described with reference to the FIGS. 1-4 in the accompanying drawings.
FIG. 1: shows the sectional view of the conventional drum top along with desired Gasket flow.
FIG. 2: shows a sectional elevation of the GRTF drum top with the desired gasket flow in vertical direction.
FIG. 3: is a sectional view of the original fitting with the grooved rolled thread flange on the drum top.
FIG. 4: is a sectional view of the grooved rolled thread flange showing the mounting of the gasket on the grooved flanges without drum top.
Referring to FIGS. 1, 2, 3 and 4 in the accompanying drawings, the conventional drum top with the insertion of flanges and the throw of gaskets vertically and horizontally in comparison to the GRT flange with the drum top which has been given in comparative statement in Annex A wherein it is established that the extension of gasket is vertically higher in the GRT type of flange with the Gasket.
FIG. 1 shows the conventional flange insertion with dissimilar dual gasket having different type of material and their combinations used such as black Nitrile Gasket, White EPDM Gasket, it was shown in the figure that the extension of gasket is lower as compare to GRT type of flange and drum top.
FIG. 2 shows the GRT flange insertion with similar dual gasket wherein the extension of the gasket is higher in the vertical direction. The same combination of dual gasket as single gasket has been tested which is shown in FIGS. 3 & 4 wherein the extension of gasket in the vertical direction is higher as compare to conventional flange insertion. Therefore it is established that the vertical speed of gasket is higher in GRT flange with similar dual gasket compare to conventional drum top were as the horizontal speed of gasket is lower in case of GRT flange in comparison with other.
This is an embodiment of the invention and several modifications are possible which may be considered with in the ambit and spirit of this invention. Since many modifications, variations and changes in detail may be made to the above described embodiment it is intended that all matters described in the foregoing description and illustration in the accompanying drawing which may be considered within the spirit and ambit of this invention.

Claims

1) A grooved rolled threaded flange of special grooved geometry (101) consisting of a grooved flange outwardly extended within this grooved a gasket (102) is housed of special grooved geometry which is placed between the drum top (103) and the grooved flange the gaps (104) towards the top is filled up by the gasket, while it moves upward thereby sealing the flange with the drum top.

2) A Grooved Rolled Threaded Flange of special grooved geometry (part 101) is claimed in claim 1 wherein behind a threaded part having a straight vertical/height cylindrical portion and grooved angular base portion extended outwardly which accommodates a gasket which get sandwiched between the height of the flange and the cylindrical neck of the drum.

3) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 wherein the drum top is curled outwardly to press against gasket.

4) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 wherein the gasket climb upward while insertion instead of going horizontally which makes assembly leak proof even during accident or drop test wherein drum sheet leaves flanges base as per sketch FIG. 1 and FIG. 2.

5) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 wherein the flange and the drum top is made from any material particularly of metals and non metals.

6) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 the gasket is made from resilient material.

7) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 wherein the special grooved geometry restricts horizontal flow of gasket and makes it climb up vertically along flange wall during insertion and lodge itself between drum top wall.

8) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 wherein due to favorable gasket material flow as result of groove there is less contraction force on flange thread preventing inward collapse or thread during insertion for some degree of sealing achieved and vice versa there is higher degree sealing achieved for some contraction force imported to flange thread as a result of generation of pressure due to insertion.

9) A Grooved Rolled Threaded Flange of special grooved geometry I claimed in claim 1 has higher loose stiffness due to special groove geometry and would as a result whilst and higher degree of abuse in case of accident in transport of hazardous chemicals.

10) A Grooved Rolled Threaded Flange of special grooved geometry (101) as claimed in claim 1 has higher effective base thickness as per (sketch) and would be able to economically replace higher base thickness flanges in same insertion die set ups.

11) The Grooved may be larger or smaller depending on whether accident leakproofness desired for hazardous chemical handling and for the that purpose higher vertical climb or gasket material desired or just plain sealing desired which may be imported into gasket of normal dimensions.