JP5304682B2 - Packing backup ring for high pressure resistance in hydraulic testing machine - Google Patents

Packing backup ring for high pressure resistance in hydraulic testing machine Download PDF

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JP5304682B2
JP5304682B2 JP2010033347A JP2010033347A JP5304682B2 JP 5304682 B2 JP5304682 B2 JP 5304682B2 JP 2010033347 A JP2010033347 A JP 2010033347A JP 2010033347 A JP2010033347 A JP 2010033347A JP 5304682 B2 JP5304682 B2 JP 5304682B2
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ring
packing
backup ring
high pressure
testing machine
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JP2011169725A (en
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伊佐生 広
憲治 横枕
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JFE Steel Corp
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JFE Steel Corp
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本発明は、鋼管の気密性を検査する水圧試験機の部品として使用され、高い試験圧力での水圧試験でもパッキンリングのシール性を確保しうる、耐高圧用のパッキンバックアップリングに関する。   The present invention relates to a high-pressure packing back-up ring that can be used as a part of a hydraulic tester for inspecting the airtightness of a steel pipe and can ensure the sealing performance of the packing ring even in a water pressure test at a high test pressure.

従来より流体移送用や内圧負荷用の鋼管には、管内を静水圧により所定の試験圧力まで加圧する水圧試験を行って、気密性を検査している。この検査に用いる水圧試験機は、例えば図１に示すように、検査対象の鋼管1の両端部に、先端開口7と後端給水口9とを有する中空のシールヘッド2を外嵌し、シールヘッド2内に設けた連通孔5により鋼管1内部と連通する、シールヘッド2内周面と鋼管1外周面との隙間6を封鎖するために、シールヘッド2の開口端7付近の内周面に設けた凹座部8内に、先端開口7を背にして隙間6を封鎖する弾性のパッキンリング3と、パッキンリング3の背面を補強する剛性のパッキンバックアップリング4とを嵌装して構成される。   Conventionally, a steel pipe for fluid transfer or internal pressure load is inspected for airtightness by performing a water pressure test in which the inside of the pipe is pressurized to a predetermined test pressure by hydrostatic pressure. For example, as shown in FIG. 1, a water pressure tester used for this inspection includes a hollow seal head 2 having a front end opening 7 and a rear end water supply port 9 at both ends of a steel pipe 1 to be inspected. In order to seal the gap 6 between the inner peripheral surface of the seal head 2 and the outer peripheral surface of the steel pipe 1, which communicates with the inside of the steel pipe 1 through the communication hole 5 provided in the head 2, the inner peripheral surface in the vicinity of the opening end 7 of the seal head 2 An elastic packing ring 3 that seals the gap 6 with the tip opening 7 on the back and a rigid packing backup ring 4 that reinforces the back of the packing ring 3 are fitted in the recessed portion 8 provided in Is done.

パッキンリング3は、シール効果を高めるために、通常、半径方向断面が矩形状である胴体部3Aの前面側に外径リップ3Bと内径リップ3Cとを外開きの両脚とするＶ字形状部が連なる形状とされている。胴体部3Aの内径は鋼管1の外径よりも大きくとられ、外径リップ3Bの先端部の外径は凹座部8の内径よりも大きくとられ、内径リップ3Cの先端部の内径は鋼管1の外径よりも小さくとられている。パッキンバックアップリング4は、通常、半径方向断面が矩形状であってその内径は、鋼管1への容易装着可能とする観点から、鋼管1の外径よりも大きく、かつ、パッキンリング3の胴体部3Aの内径よりも大きくとられている。   In order to enhance the sealing effect, the packing ring 3 is generally provided with a V-shaped portion having an outer diameter lip 3B and an inner diameter lip 3C on both sides of the outer opening on the front side of the body portion 3A having a rectangular cross section in the radial direction. It has a continuous shape. The inner diameter of the body portion 3A is larger than the outer diameter of the steel pipe 1, the outer diameter of the distal end portion of the outer diameter lip 3B is larger than the inner diameter of the recessed seat portion 8, and the inner diameter of the distal end portion of the inner diameter lip 3C is The outer diameter is smaller than 1. The packing backup ring 4 is generally rectangular in cross section in the radial direction, and its inner diameter is larger than the outer diameter of the steel pipe 1 from the viewpoint of easy mounting to the steel pipe 1, and the body portion of the packing ring 3 It is larger than the inner diameter of 3A.

なお、パッキンリング背面とパッキンバックアップリングのパッキン押さえ面とのそれぞれに凹溝を設け、双方の凹溝に環状の移動阻止部材を嵌装することで、パッキンリングの半径方向不均一変形によるシール性低下を防ぐ旨の提案もある（特許文献１）。
水圧試験中は、シールヘッド2の後端給水口9から鋼管1の内部に負荷された高水圧が、連通孔5から隙間6に伝達してパッキンリング3の前面で受圧され、これによって外径リップ3Bが凹座部8の内周面に密着し、かつ、内径リップ3Cが鋼管1の外周面に密着することで、シール性が確保される。 In addition, the groove ring is provided on each of the packing ring back surface and the packing pressing surface of the packing backup ring, and an annular movement blocking member is fitted in both of the groove grooves, so that the sealing performance due to non-uniform deformation of the packing ring in the radial direction is provided. There is also a proposal to prevent the decrease (Patent Document 1).
During the water pressure test, the high water pressure applied to the inside of the steel pipe 1 from the rear end water supply port 9 of the seal head 2 is transmitted from the communication hole 5 to the gap 6 and received by the front surface of the packing ring 3, thereby receiving the outer diameter. Since the lip 3B is in close contact with the inner peripheral surface of the recessed portion 8 and the inner diameter lip 3C is in close contact with the outer peripheral surface of the steel pipe 1, sealing performance is ensured.

特開２００７−２９２７０６号公報JP 2007-292706 A

しかし、本発明者らは、上述の従来技術には、図２に示すような問題点があることを知見した。すなわち、試験圧力が比較的高くなると、パッキンリング3の変形量が増大して、胴体部3Aまで変形するようになり、その結果、胴体部3Aの内周面側（B部）が、パッキンバックアップリング4の内周面と鋼管1の外周面との隙間にはみ出して破損し、当該隙間から破損抜けして水圧試験ができなくなる場合が少なからず起こるという問題点である。   However, the present inventors have found that the above-described prior art has a problem as shown in FIG. That is, when the test pressure becomes relatively high, the deformation amount of the packing ring 3 increases, and the body part 3A is deformed. As a result, the inner peripheral surface side (B part) of the body part 3A is a packing backup. There is a problem that there are not a few cases in which the water pressure test cannot be performed because it breaks out of the gap between the inner circumferential surface of the ring 4 and the outer circumferential surface of the steel pipe 1 and breaks through the gap.

つまり、従来技術では水圧試験時にパッキンリングに不要な変形が生じてパッキンリングの寿命を縮めているという課題があった。   That is, in the prior art, there has been a problem that unnecessary deformation occurs in the packing ring during the water pressure test and the life of the packing ring is shortened.

本発明は前記課題を解決するためになされたものであって、その要旨は次のとおりである。
（１）鋼管の試験水圧が少なくとも65MPaである水圧試験に用いる鋼製のパッキンバックアップリングであって、リング半径方向の断面が、長方形である矩形状部と、該矩形状部のリング内周側の辺とパッキンリング対面側の辺とがなす角部分を、リング長さが増加し、かつこの増加分より小さい減少分でリング内径が減少する方向に張り出させてなる矢形状部とからなることを特徴とする、水圧試験機での耐高圧用のパッキンバックアップリング。 The present invention has been made to solve the above problems, and the gist thereof is as follows.
(1) Test pressure of the steel pipe is a packing back-up ring of steel used in the hydrostatic test is at least 65 MPa, ring radial cross section, a rectangular section is rectangular, ring inner circumference side of該矩shaped portion The angle between the side of the packing ring and the side facing the packing ring is made up of an arrow-shaped portion that extends in the direction in which the ring length increases and the ring inner diameter decreases with a decrease smaller than this increase. Packing back-up ring for high pressure resistance in hydraulic testing machines.

本発明によれば、水圧試験時にパッキンリングの不要な変形が防止され、パッキンリングの寿命が向上する。   According to the present invention, unnecessary deformation of the packing ring is prevented during the water pressure test, and the life of the packing ring is improved.

従来に係る水圧試験でのシール構造の概要を示す断面図Sectional drawing which shows the outline | summary of the seal structure in the conventional water pressure test 従来の問題点を示す断面図Cross-sectional view showing conventional problems 本発明に係る水圧試験でのシール構造の概要を示す断面図Sectional drawing which shows the outline | summary of the seal structure in the water pressure test which concerns on this invention 本発明例のパッキンバックアップリングの寸法を示す断面図Sectional drawing which shows the dimension of the packing backup ring of the example of this invention

図３は、本発明に係る水圧試験でのシール構造の概要を示す断面図である。図３において、10は本発明のパッキンバックアップリングであり、このものは、リング半径方向の断面が、矩形状部10Aと、該矩形状部10Aのリング内周側の辺とパッキンリング対面側の辺とがなす角部分を、リング長さが増加し、かつこの増加分より小さい減少分でリング内径が減少する方向に張り出させてなる矢形状部10Bとからなっている。なお、図１と同一または相当部材には同じ符号を付し、説明を省略する。図３に示すように、本発明のパッキンバックアップリング10は、矩形部10Aと一体をなしてリング内径が矩形部10Aよりもやや小径でかつパッキンリング3側に比較的大きく張り出した矢形状部10Bを有するから、高水圧によりパッキンリング3の胴体部3Aが変形しても、この変形した部分がパッキンバックアップリング10の内周面と鋼管1の外周面との隙間にはみ出すことは、矢形状部10Bによって抑制され（図３のA部参照）、その結果、従来のような破損抜け（図２のB部参照）には至らず、パッキンリング3の寿命が向上する。   FIG. 3 is a cross-sectional view showing an outline of the seal structure in the water pressure test according to the present invention. In FIG. 3, reference numeral 10 denotes a packing backup ring according to the present invention, which has a cross section in the radial direction of the ring, a rectangular portion 10A, a side of the rectangular portion 10A on the inner peripheral side of the ring, and a packing ring facing side. The corner portion formed by the side is composed of an arrow-shaped portion 10B in which the ring length is increased and the ring inner diameter is decreased in a direction in which the ring inner diameter decreases with a decrease smaller than the increase. In addition, the same code | symbol is attached | subjected to the same or equivalent member as FIG. 1, and description is abbreviate | omitted. As shown in FIG. 3, the packing backup ring 10 of the present invention has an arrow-shaped portion 10B integrally formed with the rectangular portion 10A and having a ring inner diameter slightly smaller than that of the rectangular portion 10A and extending relatively large toward the packing ring 3 side. Therefore, even if the body part 3A of the packing ring 3 is deformed by high water pressure, the deformed part protrudes into the gap between the inner peripheral surface of the packing backup ring 10 and the outer peripheral surface of the steel pipe 1, 10B (refer to part A in FIG. 3). As a result, the conventional breakage (see part B in FIG. 2) does not occur and the life of the packing ring 3 is improved.

本発明例として、中径シームレス鋼管13-5/8Bサイズ（外径φ347ｍｍ）を試験対象として図３に示した方法で水圧試験を行った。試験水圧は65MPaとした。用いた本発明のパッキンバックアップリングの寸法および材質を図４に示す。なお、パッキンリングの材質は布入りゴムとした。本発明例において、パッキンリングの寿命は、使用開始から劣化して交換されるまでのパッキンリング１個当たりの試験鋼管本数で評価して100本／個であり、図１に示した従来のパッキンバックアップリングを用いた方法ではそれが1本／個であったのに対して、大幅に向上した。   As an example of the present invention, a water pressure test was performed by the method shown in FIG. 3 using a medium-diameter seamless steel pipe 13-5 / 8B size (outer diameter φ347 mm) as a test object. The test water pressure was 65 MPa. The dimensions and materials of the packing backup ring of the present invention used are shown in FIG. The packing ring was made of rubber with cloth. In the example of the present invention, the life of the packing ring is 100 pipes / piece as evaluated by the number of test steel pipes per packing ring from the start of use until it is replaced, and the conventional packing shown in FIG. In the method using the backup ring, it was 1 / piece, but it was greatly improved.

1 鋼管
2 シールヘッド
3 パッキンリング（従来）
3A 胴体部
3B 外径リップ
3C 内径リップ
4 従来のパッキンバックアップリング
5 連通孔
6 隙間
7 先端開口
8 凹座部
9 後端給水口
10 本発明のパッキンバックアップリング
10A 矩形状部
10B 矢形状部 1 Steel pipe
2 Seal head
3 Packing ring (conventional)
3A fuselage
3B outer lip
3C inner diameter lip
4 Conventional packing backup ring
5 Communication hole
6 Clearance
7 Tip opening
8 Concave part
9 Rear end water inlet
10 Packing backup ring of the present invention
10A rectangular part
10B Arrow shaped part

Claims (1)

鋼管(1)の試験水圧が少なくとも65MPaである水圧試験に用いる鋼製のパッキンバックアップリング(10)であって、リング半径方向の断面が、長方形である矩形状部(10A)と、該矩形状部のリング内周側の辺とパッキンリング対面側の辺とがなす角部分を、リング長さが増加し、かつこの増加分より小さい減少分でリング内径が減少する方向に張り出させてなる矢形状部(10B)とからなることを特徴とする、水圧試験機での耐高圧用のパッキンバックアップリング。 A steel tube (1) steel packing backup ring test water pressure is used for hydrostatic testing of at least 65MPa (10), the ring radial cross section, a rectangular section is rectangular and (10A),該矩shape The angle between the inner ring side of the ring and the side facing the packing ring is projected so that the ring length increases and the ring inner diameter decreases with a decrease smaller than this increase. A packing backup ring for high pressure resistance in a hydraulic testing machine, characterized by comprising an arrow-shaped part (10B).
JP2010033347A 2010-02-18 2010-02-18 Packing backup ring for high pressure resistance in hydraulic testing machine Active JP5304682B2 (en)

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WO2015182408A1 (en) * 2014-05-29 2015-12-03 Nok株式会社 Sealing structure and sealing device
CN104931340A (en) * 2015-06-11 2015-09-23 山东华信塑胶股份有限公司 Sealing fixture used for pipe hydrostatic resistance test and using method of sealing fixture
CN105538190B (en) * 2016-01-21 2017-03-15 青岛达能环保设备股份有限公司 Eccentric embracing presss from both sides internal enclosed fast fixture
KR101921257B1 (en) * 2018-06-27 2018-11-22 (주)백천정밀 Internal pressure test device for pipes

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JP2597071Y2 (en) * 1992-09-30 1999-06-28 エヌオーケー株式会社 gasket
JP5133868B2 (en) * 2006-03-08 2013-01-30 イーグル工業株式会社 Sealing device
JP2008057756A (en) * 2006-09-04 2008-03-13 Kayaba Ind Co Ltd Oil seal for reciprocating

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