US2729472A - Packing for condenser tubes - Google Patents

Packing for condenser tubes Download PDF

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Publication number
US2729472A
US2729472A US340125A US34012553A US2729472A US 2729472 A US2729472 A US 2729472A US 340125 A US340125 A US 340125A US 34012553 A US34012553 A US 34012553A US 2729472 A US2729472 A US 2729472A
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Prior art keywords
packing
tube
tubes
insert
packing rings
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US340125A
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Pennella Samuel
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/001—Branching pipes; Joining pipes to walls the wall being a pipe plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/06—Arrangements for sealing elements into header boxes or end plates by dismountable joints
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/934—Seal swells when wet

Definitions

  • This invention relates to surface condensers as used in the condensing of exhaust steam in power plants and more particularly to a construction of packing for the tubes of such a condenser which packing may be quickly, easily and inexpensively installed and will not only prevent leakage of liquid or vapor throughthe connections of the tube and tube sheets of the condenser but will eliminate or insulate the tubes from the setting up of electrolytic action with the consequent deterioration of the tubes, tube sheets and packing.
  • the packing of the present invention comprises an insert at the inlet end ofacondenser tube which is of material substantially inert to action of chemicals or acid in the water and forms an insulator against electrolytic action, thereby providing a protection for the inlet end of the tube with a consequent lengthening of the life of the tube.
  • Figure l is a fragmentary section through a part of a condenser showing the improved packing applied thereto.
  • Figure 2 is a longitudinal section of an insert ring employed in the packing structure.
  • Figure 3 is an end view of the insert ring.
  • 1 and 2 indicate the inlet end tube sheet and outlet end tube sheet of a surface condenser, each of which is drilled to provide aligning tube receiving openings 3 and 4 respectively.
  • the openings 3 and 4 are counterbored as shown at 5 and the major portion of the inner wall of the counterbore is roughened in any suitable manner as shown at 6 so as to provide annular corrugations on a major portion of the inner surface of the counterbore.
  • the packing structure in the counterbore 5 in the outlet tube sheet 2 is of substantially the same construction as the packing disclosed in my companion application, Serial No. 340,124 filed March 3, 1953, and consequently this packing structure 7 will neither be described nor claimed in the present application.
  • the tube 8 of the condenser which extends from the inlet tube sheet 1 to the outlet tube sheet 2 asis ordinary in the construction of surface condensers projects only part way through the counterbore 6 and it has its end which is located within the counterbore flared as is shown at 9. However, prior to the flaring of the end of the tube 8 a packing ring 10 of highly compressed fiber is mounted in the counterbore 6 about a portion of the tube 8.
  • the packing ring 10 is of material of a nature which will swell when wetted so that when it is driven upon the tube and into the counterbore it will first by the force of this driving action and its contact with the wall of the counterbore be distorted to form an initial seal and after being wetted will swell and form a permanent fluid tight seal between the tube 8 and the tube sheet 1.
  • the hard compressible fiber packing ring 10 is provided with an annular recess 11 therein in which is mounted compressible packing 12.
  • the compressible packing 12 may be corset lacing, compressible metal packing or any similar type of compressible packing.
  • This compressible packing engages the tube 3, forming a seal therewith and between the seal and the fiber packing ring 10 so as to prevent leakage of water into the interior of the condenser between the tube sheets before such time as the fiber ring swells.
  • the flaring of the end 9 of the condenser tube 8 serves to hold the packing ring 10 firmly in position.
  • An insert packing ring 13 is provided which is constructed of tough, hard plastic of-a phenolic-linen or phenolic-fiber composition such as Micarta manufactured by the Westinghouse Electric and Mfg. Co., or similar materials.
  • the material of which the insert packing ring 13 is formed will swell to a certain degree upon being wetted but it will not swell to as great a degree as will the highly compressed packing ring 10.
  • the insert ring 13 has its inner end 14 reduced in diameter forming an annular shoulder 15 and the reduced portion 14 which when the insert packing ring 13 is driven into the counterbore 6 will extend into the flared inlet end of the tube 8 as clearly shown in Fig. 1 of the drawings.
  • a packing ring 16 of highly compressed fiber which will swell when wetted is placed between the shoulder 15 and theflared end 9 of the tube 8 and this ring further provides for a firm fluid tight seal between the'tube 8 and the tube sheet 1.
  • the insert packing ring 13 being of a tough, hard plastic also forms an insulator for insulating the tube 8 from the tube sheet 1 and prevents the setting up of electrolytic action between the tube and the tube sheet at the inlet end of the tube.
  • the plastic insert extending into the inlet end of the tube further protects the tube from cavitation set up by turbulence of the water at the inlet end and the plastic material of which the insert 13 is made is much less susceptible to corrosion and errosion set up by the turbulence of the water entering the tube and therefore the life of the tube at its inlet end is materially lengthened with the use of the present packing structure.
  • packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counter- Patented Jan. 3, 1956- bores outwardly of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said condenser tube sheet upon their swelling when wetted.
  • a surface condenser the combination of tube sheets having tube end receiving openings therein of substantially the diameter of the outside diameter of the tubes and tubes extending from one tube sheet to the other, said tube sheet openings counterbored at their inlet ends to a diameter greater than the outside diameter of the tubes, said tubes at their inlet ends extending into and only partially through the counterbores and having their inlet ends flared outwardly into the counterbores, packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and having flat end abutting engagement against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counterbores of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said condenser tube sheet upon
  • a surface condenser the combination of tube sheets having tube ends receiving openings therein of substantially the diameter of the outside diameter of the tubes and tubes extending from one tube sheet to the other, said tube sheet openings counterbored at their inlet ends to a diameter greater than the outside diameter of the tubes, said tubes at their inlet ends extending into and only partially through the counterbores and having their inlet ends flared outwardly into the countcrbores, packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and having flat end abutting engagement against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counterbores outwardly of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said conden

Description

3, 1956 s. PENNELLA PACKING FOR CONDENSER TUBES Filed March 5. 1953 FlG.l
FIG.3
FIGZ
SAMUEL PENNELLA IN VEN TOR.
Ufl f ds a s Par n e 2,729,472 PACKING FOR CONDENSER'TUBES Samuel Pennella, Pompton Lakes, N. J. Application March 3, 1953,- Serial No. 340,125
3 can... or. 285- 1 i This invention relates to surface condensers as used in the condensing of exhaust steam in power plants and more particularly to a construction of packing for the tubes of such a condenser which packing may be quickly, easily and inexpensively installed and will not only prevent leakage of liquid or vapor throughthe connections of the tube and tube sheets of the condenser but will eliminate or insulate the tubes from the setting up of electrolytic action with the consequent deterioration of the tubes, tube sheets and packing.
The packing of the present invention comprises an insert at the inlet end ofacondenser tube which is of material substantially inert to action of chemicals or acid in the water and forms an insulator against electrolytic action, thereby providing a protection for the inlet end of the tube with a consequent lengthening of the life of the tube.
With these and other objects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a packing for condenser tubes of a preferred form embodying the invention, and the features forming the invention will be specifically pointed out in the claims.
In the drawings:
Figure l is a fragmentary section through a part of a condenser showing the improved packing applied thereto.
Figure 2 is a longitudinal section of an insert ring employed in the packing structure.
Figure 3 is an end view of the insert ring.
Referring more particularly to the drawings, 1 and 2 indicate the inlet end tube sheet and outlet end tube sheet of a surface condenser, each of which is drilled to provide aligning tube receiving openings 3 and 4 respectively. The openings 3 and 4 are counterbored as shown at 5 and the major portion of the inner wall of the counterbore is roughened in any suitable manner as shown at 6 so as to provide annular corrugations on a major portion of the inner surface of the counterbore.
The packing structure in the counterbore 5 in the outlet tube sheet 2 is of substantially the same construction as the packing disclosed in my companion application, Serial No. 340,124 filed March 3, 1953, and consequently this packing structure 7 will neither be described nor claimed in the present application.
The tube 8 of the condenser which extends from the inlet tube sheet 1 to the outlet tube sheet 2 asis ordinary in the construction of surface condensers projects only part way through the counterbore 6 and it has its end which is located within the counterbore flared as is shown at 9. However, prior to the flaring of the end of the tube 8 a packing ring 10 of highly compressed fiber is mounted in the counterbore 6 about a portion of the tube 8. The packing ring 10 is of material of a nature which will swell when wetted so that when it is driven upon the tube and into the counterbore it will first by the force of this driving action and its contact with the wall of the counterbore be distorted to form an initial seal and after being wetted will swell and form a permanent fluid tight seal between the tube 8 and the tube sheet 1. The hard compressible fiber packing ring 10 is provided with an annular recess 11 therein in which is mounted compressible packing 12. The compressible packing 12 may be corset lacing, compressible metal packing or any similar type of compressible packing. This compressible packing engages the tube 3, forming a seal therewith and between the seal and the fiber packing ring 10 so as to prevent leakage of water into the interior of the condenser between the tube sheets before such time as the fiber ring swells. The flaring of the end 9 of the condenser tube 8 serves to hold the packing ring 10 firmly in position.
An insert packing ring 13 is provided which is constructed of tough, hard plastic of-a phenolic-linen or phenolic-fiber composition such as Micarta manufactured by the Westinghouse Electric and Mfg. Co., or similar materials. The material of which the insert packing ring 13 is formed will swell to a certain degree upon being wetted but it will not swell to as great a degree as will the highly compressed packing ring 10. The insert ring 13 has its inner end 14 reduced in diameter forming an annular shoulder 15 and the reduced portion 14 which when the insert packing ring 13 is driven into the counterbore 6 will extend into the flared inlet end of the tube 8 as clearly shown in Fig. 1 of the drawings. A packing ring 16 of highly compressed fiber which will swell when wetted is placed between the shoulder 15 and theflared end 9 of the tube 8 and this ring further provides for a firm fluid tight seal between the'tube 8 and the tube sheet 1. The insert packing ring 13 being of a tough, hard plastic also forms an insulator for insulating the tube 8 from the tube sheet 1 and prevents the setting up of electrolytic action between the tube and the tube sheet at the inlet end of the tube. Furthermore, the plastic insert extending into the inlet end of the tube further protects the tube from cavitation set up by turbulence of the water at the inlet end and the plastic material of which the insert 13 is made is much less susceptible to corrosion and errosion set up by the turbulence of the water entering the tube and therefore the life of the tube at its inlet end is materially lengthened with the use of the present packing structure. After the packing rings 10 and 16 and the insert packing ring 13 have been wetted they will all swell, merging .into the corrugations 6 and forming a fluid tight seal to prevent leakage of water past the inlet end of the tube into the interior of the condenser (not shown) between the tube sheets.
It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they may be widely modified within the invention defined by the claims.
What is claimed is:
1. In a surface condenser the combination of tube sheets having tube end receiving openings therein of substantially the diameter of the outside diameter of the tubes and tubes extending from one tube sheet to the other, said tube sheet openings counterbored at their inlet ends to a diameter greater than the outside diameter of the tubes, said tubes at their inlet ends extending into and only partially through the counterbores. and having their inlet ends flared outwardly into the counterbores, packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counter- Patented Jan. 3, 1956- bores outwardly of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said condenser tube sheet upon their swelling when wetted.
2. In a surface condenser the combination of tube sheets having tube end receiving openings therein of substantially the diameter of the outside diameter of the tubes and tubes extending from one tube sheet to the other, said tube sheet openings counterbored at their inlet ends to a diameter greater than the outside diameter of the tubes, said tubes at their inlet ends extending into and only partially through the counterbores and having their inlet ends flared outwardly into the counterbores, packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and having flat end abutting engagement against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counterbores of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said condenser tube sheet upon their swelling when Wetted, said insert rings having their inner end portions reduced in diameter and providing shoulders for engagement with said second packing rings to hold said second packing rings tightly against the flared ends of the tubes.
3. In a surface condenser the combination of tube sheets having tube ends receiving openings therein of substantially the diameter of the outside diameter of the tubes and tubes extending from one tube sheet to the other, said tube sheet openings counterbored at their inlet ends to a diameter greater than the outside diameter of the tubes, said tubes at their inlet ends extending into and only partially through the counterbores and having their inlet ends flared outwardly into the countcrbores, packing rings of highly compressed material which will swell when wetted in said counterbores inwardly of the flared ends of said tubes, said packing rings provided with internal recesses, compressible packing in said recesses and engaging the tubes and said packing rings to form seals therebetween, second packing rings of highly compressed fiber which will swell when wetted in said counterbore and having flat end abutting engagement against the flared ends of said tubes, and insert packing rings of hard tough plastic inserted in said counterbores outwardly of said second packing rings said second packing rings and said insert packing rings forming fluid tight seals with said condenser tube sheet upon their swelling when wetted, said insert rings having their inner end portions reduced in diameter and providing shoulders for engagement with said second packing rings to hold said second packing rings tightly against the flared ends of the tubes, said reduced diameter sections of said insert packing rings extending into the flared ends of said tubes and forming seals over the point of contact of said flared ends and said second packing rings.
References Cited in the file of this patent UNITED STATES PATENTS 1,742,793 Staples Jan. 7, 1930 2,090,266 Parker Aug. 17, 1937 2,420,721 Pennella May 20, 1947 2.449,616 Pennella Sept. 21, 1948
US340125A 1953-03-03 1953-03-03 Packing for condenser tubes Expired - Lifetime US2729472A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904315A (en) * 1957-01-04 1959-09-15 Pennella Samuel Packing means for the tube joints in surface condensers
US5992858A (en) * 1996-04-15 1999-11-30 Teaster; Sherrill Dean Device used in sealing tie reinforcement holes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742793A (en) * 1926-06-09 1930-01-07 Nat Electric Prod Corp Condenser-tube fastening
US2090266A (en) * 1935-04-27 1937-08-17 Parker Arthur La Rue Elastic coupling for tubes
US2420721A (en) * 1944-01-07 1947-05-20 Pennella Samuel Condenser tube packing
US2449616A (en) * 1946-04-05 1948-09-21 Pennella Samuel Surface condenser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742793A (en) * 1926-06-09 1930-01-07 Nat Electric Prod Corp Condenser-tube fastening
US2090266A (en) * 1935-04-27 1937-08-17 Parker Arthur La Rue Elastic coupling for tubes
US2420721A (en) * 1944-01-07 1947-05-20 Pennella Samuel Condenser tube packing
US2449616A (en) * 1946-04-05 1948-09-21 Pennella Samuel Surface condenser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904315A (en) * 1957-01-04 1959-09-15 Pennella Samuel Packing means for the tube joints in surface condensers
US5992858A (en) * 1996-04-15 1999-11-30 Teaster; Sherrill Dean Device used in sealing tie reinforcement holes

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