US1866561A - Tube and tube sheet and ferrule therefor - Google Patents

Description

July 12, r 055 TUBE AND TUBE SHEET AND FERRULE THEREFOR Filed -Aug. 7. 1950 fv awueutoz WM WOT/W8 e 1% Patented July 12, 1932 UNITED STATES JOHN H. GOSS, or WATERBURY, conuno'rrcur'gajssreuon rro scov-I I. 'iziaunracrunrue COMPANY, or WATEBIBUEY, couunc'rrcnr, A oonrona'rrou or co uuncrrcur 'TUIBE AND TUBE SHEET Ann seamen rnnnnrcnf 'This invention relates to tubes and tube V sheets, and ferrules therefor.

It has been common practice in manufacturing water tube condensers and the like to 5 anchor the tubes in the tube sheets by ferrules which are threaded into tapped holes in the tube sheets and bear against packing material, compressing the same. These ferrules project a substantial distance beyond 10 the face of the tube sheets and their outer ends have screw-driver slots for manipulation by a suitable tool. This construction has the disadvantage that the ferrules form what are known as gas pockets adjacent the turbulence. As a result of such gas pockets and water turbulence, air is released from the flowing water and this air, or the dissolved oxygen therein, attacks the tubes. It has been found that with the construction referred to the tubes soon-require replacement.

A further disadvantage of the ferrules referred to is the metal cost.

It is an object of the present invention to provide a ferrule for anchoring tubes in tube sheets such that the above mentioned disadvantages are avoided. With this general object in view,'the invention consists in the features, combinations, details of construction and arrangements of parts which will first be described in connection with the accompanying drawing and then more specifically pointed out. i

In the drawing:

Figure 1 is a sectional view, with parts broken away, of a tube, tube sheetrand fer- Figure 3 is a sectional view taken on the line 3-3 of Fig. 2.

Referring to the drawing, 4 represents a tube sheet, e. g. the tube sheet at the inlet end g of a water tube condenser. Anchored in the tube sheet is a tube 5.

The tube sheet hole is reamed and tapped turbulence. This'maybe accomplished by a ferrule flush with the outerface' of the'tubev sheet'and-further by giving the ferruleabellrule, constructed in accordance with the inin the usual way'to receive a ferrule and a packing.

tween whichis a-fibre ring 8. V I

. Threaded into the tapped hole'of thetube'v sheet is a ferrule 9,1its exterior surface having a threadlOto thisfend; The inner end of the *ferrule engagesthe packing to compress the same. p, I W V p Provision is made for protecting or'cover- 'iing'the end ofthetube 5'fromthe inflowing waterRTo this end, as here shownas an EX- 7 1 exposed ends of the tubes and the projecting ends in the path of the incoming water cause:

ample, the ferrule wall is cut away at its in- ;ner end to for'man internal shoulder ll'for receiving the end ofthe tube 5. -fAs shown. v

the radial depth of this shoulder is substan'- tia'l ly equalto thethickness 'o-f the tube wall. With the construction described the shoulder covers; the end of th'eftube, and ferrule" wall and tube wall present a flush surface to the incOming waterf uProvision- ;1's made fofhiinimizing water month. In the embodiment here illustrated 'as an example, the interior wall of the ferrule flares outwardly in the form of a so-called' hydraulic curve 12. Moreover, the outer rim of the ferrule is substantially flush with the outer face of the tube sheet. To this end, the parts are so arranged that as the ferrule is threaded into place this flush arrangement 5 occurs when the packing is properly compressed. Thus the packing serves as a stop for positioning the ferrule. g With the constructiondescribed, the assembled structure presents'a flush surface to the incoming water'and this, in connection with the curve of the ferrule bore, reduces water turbulence to a minimum. l There is provided means whereby the fer- 1 rule may be manipulated by a tool and in constructions embodying the invention to the best advantage, this is accomplished in such a way that the thread of the tube sheet hole is not exposed to the incomingwater. This may be accomplished by forming theflared wall a of the ferrule with one or more slots or notches 13, four being illustrated in the present embodiment. These notches extend from a point close to the outer rim of the ferrule to a point near shoulder 11. The bottom of the notches are concaved, as appears in Fig. 3,

thewcurve being substantially the reverse of a the curve of the ferrule wall. The ferrule may be manipulated by a suitable wrenchlike tool having lugs shaped to enter notches 13. These notches, even though the ferrule is flush with the tube sheet, do not expose any part of the thread of the tube sheet hole to the action of the water. Moreover, they do not tend to cause any-Water turbulence in themselves as their bottom faces are on the so-called hydraulic curve. e

.' At the other end of the'tube 5., the ferrule may be of like construction: or the old common type of ferrule may be used, since at the outlet end Water turbulence and gas pockets are not involved;

The ferrule described,i'n addition to the-ad- I vantages above mentioned, is smaller in metal content than the old ferrules, cost is materially reduced. What is claimed is:

whereby metal a A preformed metal ferrule for anchoring a tube in a tube sheet, said ferrulehaving a threaded cylindrical outer wall and a bellmouth inner front wall with a substantially cylindrical tube-engaging rearward Wall and having at least onenotch for receiving a manipulating tool, said notch being formed in the bell-mouth inner front wall and having aconcave bottom, with said notch extending from a point close to the rim of the bellmouth to alpoint close to said tube-engaging rearward wall, whereby absence of'angular projections in said notch tends to prevent turbulence of flow.

In testimony whereof, I have hereunto set my hand. i JOHN H. GOSS.

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