DE102005001994B3 - Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series - Google Patents

Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series Download PDF

Info

Publication number
DE102005001994B3
DE102005001994B3 DE200510001994 DE102005001994A DE102005001994B3 DE 102005001994 B3 DE102005001994 B3 DE 102005001994B3 DE 200510001994 DE200510001994 DE 200510001994 DE 102005001994 A DE102005001994 A DE 102005001994A DE 102005001994 B3 DE102005001994 B3 DE 102005001994B3
Authority
DE
Germany
Prior art keywords
consumer
line
supply line
lines
bypass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE200510001994
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Hamacher GmbH
Original Assignee
Karl Hamacher GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Karl Hamacher GmbH filed Critical Karl Hamacher GmbH
Priority to DE200510001994 priority Critical patent/DE102005001994B3/en
Application granted granted Critical
Publication of DE102005001994B3 publication Critical patent/DE102005001994B3/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices

Abstract

The subject of the present invention is a method for pressure control in mining hydraulic supply lines (5, 6). In particular, it is about the optimization of a pressure drop in long distance supply lines. In this case, the respective hydraulic supply line (5, 6) at least one supply line (6) and a connected consumer line (5). The consumer line (5) supplies several consumers (1) with a hydraulic medium. In addition, bypass lines (8) are provided, which couple the supply line (6) in addition to the consumer line (5). According to the invention, the bypass lines (8) connect the supply line (6) to the consumer line (5) in an asymmetrical longitudinal sequence.

Description

  • The The invention relates to a method for pressure control in mining Hydraulic supply lines, in particular for optimizing a pressure drop in long distance supply lines, after which the respective hydraulic supply line at least one supply line and a connected consumer line which has several regularly in a row supplied switched consumer with a hydraulic medium, and after which one or more additional Bypass lines the supply line in addition to the consumer line couple.
  • The The working method described above thus comes mainly in Streb or Streb supply lines for use, ie in the area of Dismantling front for For example, coal or other mineral materials. For the longwall construction or longwall construction is now commonly used progressive Shields that are operated with a hydraulic medium. In this Hydraulic medium is usually water, the additives such as z. For example, oil additives can be added to To prevent corrosion in the hydraulic supply lines.
  • shields for the require progressive longwall construction size amounts of liquid for their operation and high pressures. Indeed is the current fluid requirement at about 900 l / min and should in the future on values of over 1000 l / min can be increased to increase the total degradation rate, which the longwall construction must follow. In this case, pressures of 300 bar and more are used, accordingly 30 MPa.
  • Under such conditions comes in the hydraulic supply lines associated inevitable Pressure losses are becoming increasingly important. This challenge One can counter this by having larger or additional ones Pumps available be placed to the hydraulic medium in the required amount and the necessary pressure in the respective hydraulic supply line feed. Of course, this approach only makes sense if the respective hydraulic supply line and the entire supply system on larger diameter converted which is correspondingly expensive.
  • A different possibility consists of pressure losses in the longwall, in the track or generally in the associated To balance or minimize hydraulic supply line, that with the help of additional Bypass lines a complementary Coupling between the supply line and the consumer line takes place. As a result, each part of the hydraulic medium is directly above the Bypass line fed into the consumer line, without the Consumer line of the hydraulic medium in their front lying Length happens must become. This means, the local pressure losses play for each over the Bypass line supplied Hydraulic medium no role or are thereby compensated. In this way is already a significant optimization of the pressure drop has been achieved in long distance supply lines, such as the essay of Dr. Bernd Füsser "Ways to avoid a Pressure drop in long-distance supply lines "(Glückauf 140 (2004) No. 9, pages 423 to 427).
  • Indeed is the procedure described with the additional and on the Stripe length symmetrical, So equally spaced, arranged bypass lines insofar as the improvement, as the fundamental Tendency of a pressure increase starting at a transition piece from the supply line to the consumer line and ending at the end of consumer guidance is still present. The is called, it will be unchanged Pressure losses observed, which are significantly lower than the previous but still require a minimization.
  • This conclusion applies in the same way for the DE 1 921 438 , Because there is a hydraulic circuit described which is used to put stamps underground. In this case, a bypass line is provided which connects supply lines between control organs and inputs of the supply lines in the stamp. In the bypass line a throttle and possibly a shut-off device are installed. To the aforementioned problems, this document has contributed nothing.
  • Of the Invention is the technical problem underlying such a Process to develop so that the occurring pressure drops compared to the previous approach are once again reduced.
  • to solution this technical problem, the invention proposes a generic method for pressure control in mining Hydraulic supply lines, in particular for optimizing a Pressure drop in long distance supply lines before that the bypass lines in asymmetric longitudinal sequence connect the supply line to the consumer line. In contrast to the state of the art ("Possibilities to avoid a pressure drop ... ") is here so with different intervals seen between the individual bypass lines over the Streblänge worked.
  • in the Difference to the state of the art according to the essay "Options for avoidance a pressure drop in long distance supply lines "so the invention does not work anymore with a symmetrical longitudinal sequence the bypass lines, but rather propagates an asymmetric longitudinal sequence. This is usually done so that the longitudinal distance the bypass lines - starting at the transition piece of the Supply line to the consumer line - is getting smaller.
  • Thereby wears the Invention of the fact that in the first part of the transition piece to the connection point for the first bypass line the pressure drop increases approximately linearly around with increasing longitudinal distance to move into a progressive course. This explains itself due to the fact that as a consumer usually a hose line is used, which also still as a s.einem Removed suspended Hose garland is formed around the advancing shields to be able to follow.
  • Of the progressive increase in the pressure loss in the longitudinal direction of the consumer line with the consumers supplied therefrom or progressing demolitions or shields then goes into a horizontal and declining Course over, if both the supply line and the consumer line to a Pump line are connected. In any case, the pressure loss follows over Consumer line a reverse parabolic course or a Root function over the associated longitudinal distance with a maximum, which is roughly in the middle of the consumer line is settled. This special course of the pressure loss carries the invention through the asymmetrical longitudinal sequence the bypass lines bill.
  • there follows the respective pressure loss between two adjacent bypass lines approximated a root function over the longitudinal distance to the transition piece or over the Length difference between two adjacent connection points of two bypass lines. Of the respective pressure loss over the longitudinal distance to the transition piece or between two connection points of adjacent bypass lines has a maximum value approximately in the middle of the relevant longitudinal distance.
  • The Maximum values of the individual pressure loss curves between the adjacent ones Bypass lines respectively between the first bypass line and the transition piece of the Supply line to the consumer line can be by a compensation curve connect with each other. This can be done manually or by calculation. An optimization takes place now by the fact that the situation of the respective Connection points of the bypass lines and consequently their respective longitudinal distance is varied to each other or to the connection point so that the resulting individual pressure loss curves with their maximum values a nearly horizontal compensation curve for fixing define a pressure loss maximum.
  • The is called, through the asymmetric longitudinal sequence the bypass lines will be a departure from the previous course reached the individual pressure loss curves. Because the pressure loss curves with symmetrical longitudinal sequence the bypass lines or their maximum values increase more or less linear. But becomes an asymmetric longitudinal sequence of the bypass lines selected It can thus be achieved that the individual maximum values of the pressure loss curves one approximates horizontal course, hence the maximum pressure loss across from the previous procedure undergoes a reduction.
  • In this case, the respective bypass line may be formed as a T-stub, which is connected by means of a T-shaped connector running in the connection point to the supply line. The supply line is usually a pipeline, in particular high pressure pipeline, as exemplified and not limiting in the DE 100 19 384 A1 is presented.
  • in the The result is a working method for pressure control in mining Hydraulic supply lines presented by the asymmetric longitudinal sequence respective bypass lines between the supply line and the consumer line, that the maxima of individual pressure loss curves between adjacent Bypass lines approximated take a horizontal course. The observed in the prior art linear increase of the pressure loss maxima thus becomes almost constant in favor Values for the pressure loss maxima between each adjacent bypass lines or between the first bypass line and the transition piece between the supply line and leave the consumer line. This leads to the fact that the Maximum pressure loss - over the whole length seen by the consumer administration - decreased is. All this is possible without the constructive effort being increased, simply in that the longitudinal sequence the bypass lines is chosen asymmetrically so that the maxima of the individual pressure loss curves between adjacent bypass lines taken together over one approximately horizontal Course. Here are the main benefits.
  • In the following the invention will be described with reference to only one embodiment Drawing explained in detail; show it:
  • 1 a consumer in the form of a sign for a progressive longwall construction,
  • 2a to c a strut schematically with a plurality of shields according to claim 1,
  • 3 several calculated curves for the expected pressure loss in the longwall 2 .
  • 4 the calculated pressure loss in a comparison between conventional procedure with symmetrical longitudinal sequence of the bypass lines (circles) and in the asymmetrical longitudinal sequence according to the invention of the bypass lines (squares),
  • 5 a comparable calculation as in 4 taking into account a changed installation situation and
  • 6 , the longitudinal distance B i of the bypass lines seen over the entire longwall.
  • In the 1 is a sign 1 a progressive longwall construction shown. One recognizes the longwall 2 in cross-section together with a mining extraction machine 3 on a mining front 4 , With increasing mining of, for example, coal at the mining front 4 becomes the shield 1 in the direction of the arrow to the right in 1 emotional. This is done hydraulically by means of a hydraulic medium which, in the example and not limiting, is water with an oil additive to prevent corrosion.
  • The hydraulic medium is supplied via several hydraulic supply lines 5 . 6 or a whole network of hydraulic supply lines 5 . 6 the respective consumer 1 or shield 1 fed. In fact, the respective hydraulic supply line settles 5 . 6 from a consumer line 5 and a supply line 6 together. At the consumer line 5 it concerns a hose line, which in the example case as a longwall hose garland of the respective length suspended 1 is trained. This is best recognized by the 2a ). At the hydraulic supply lines 5 . 6 these are long-distance supply lines.
  • Based on 2a ) to c) one recognizes that in the representation of the longwall 2 may have a length L of, for example, 200 to 400 m. About this length L are accordingly the 2 and not limiting twelve shields 1 arranged, which - as related to 1 described - perpendicular to the dismantling front 4 move. The consumer administration 5 or tubular garland is attached to each sign 1 connected to provide the necessary pressure for, for example, the shield movement available. The hose garland or the individual hose loops ensure that the shields move 1 be balanced with each other.
  • A pump or high pressure pump 7 within the illustrated strut 2 or in a route, not shown, provides both the consumer line 5 as well as the supply line 6 with the hydraulic medium.
  • To a pressure drop or a pressure drop, especially within the consumer line 5 to be able to meet, are bypass lines 8th realized which the supply line 6 in addition to the consumer management 5 couple. In fact, the usually designed as a high-pressure tube with, for example, two-layer construction supply line 6 with the help of a transition piece 9 to the consumer management 5 connected. The bypass line 8th or the multiple bypass lines 8th now connect the supply line 6 in addition to this transition piece 9 with the consumer line 5 ,
  • In the 3 are the resulting pressure losses in bar on the Y-axis with respect to the strut length L in meters on the X-axis. It can be seen that the curve identified by small triangles reflects the situation in which without bypass 8th is working. In addition, a hose was used in this simulation instead of a high-pressure pipe to show the supply line 6 for use. It has to be considered that the starting point corresponds to the distance L = 0 as it were the transition piece 9 between the supply line 6 and the consumer leadership 5 identified while the position L = 250 m to a terminal 10 the consumer line 5 to the pump 7 corresponds. All in the 3 and also in the 4 and 5 curves shown in the respective starting point at the connection piece 9 and in the endpoint when connecting 10 at the pump 7 match.
  • The transition piece 9 marks the beginning of the calculations with a pressure loss of 0 bar, while at the end of the strut the length L in the area of the connection 10 a depending on the design adjusting additional pressure loss of, for example 20 to 50 bar is observed. This pressure loss is systemic and ultimately depends on the length of the strut 2 , the diameter ratios of one hand, consumer line 5 and on the other hand lead 6 as well as the sag of the tubular garland. This is taken into account in the calculations by an empirical factor, which takes into account the fact that an increasing bending of the tubular garland increases the pressure loss, although the Ge velvet length of the supply line 5 stays the same.
  • Anyway, that shows 3 that without bypass line 8th in about the middle of the strut 2 in the vicinity of the position L ≈ 140 m, a maximum of the pressure loss of more than 70 bar can be observed (triangular curve). On the other hand comes a (single) bypass line 8th according to the curve with closed squares used, the middle at L = 125 m the supply line 6 with the consumer line 5 coupled, so a pressure loss of about 45 bar is observed in the maximum. Even more favorable is the situation when three bypass lines 8th according to the curve marked by open squares or even five bypass lines 8th Use as it simulates the curve with the open diamonds.
  • It must be taken into account in all these cases that the individual maxima of the respective pressure loss curves between adjacent bypass lines 8th follow an approximately linear course or increase, as in 3 dot-dashed degrees of compensation for the case of the three bypass lines 8th (open squares) makes clear. With increasing stripe length L results in such a symmetrical longitudinal sequence of the bypass lines 8th Seen over the long line L, the problem that at some point the just acceptable maximum pressure drop of 50 bar (dashed horizontal in 3 ) despite the additional bypass lines 8th (again) is achieved. Of course, this maximum pressure loss is only an example value, but it expresses that the connected shield is above a certain pressure loss 1 or the connected signs 1 can no longer be moved hydraulically properly. This corresponds to the state of the art.
  • For this reason, the invention proposes that the bypass lines 8th in asymmetric longitudinal sequence the supply line 6 with the consumer line 5 connect. That is, in contrast to the symmetrical longitudinal sequence of the bypass lines 8th Seen over the stripe length L varies the distance between the respective bypass lines 8th to each other. That will be when looking at the 2 B and 2c immediately clear.
  • Here are the respective realized bypass lines 8th numbered, with the respective numbers for the three bypass lines ( 2 B ) or five bypass lines (see. 2c ) in the 4 and 5 have been picked up again. It can be seen that in the conventional prior art approach, as described in the introductory article "Possibilities for Avoiding Pressure Drop in Longwall Supply Lines", individual distances A between the bypass lines 8th are executed the same, so a symmetrical longitudinal sequence of the bypass lines 8th is seen over the line length L seen.
  • By contrast, the invention operates with different distances B i . This becomes when comparing the location of respective connection points 11 the associated bypass line 8th to the supply line 6 in comparison to the strike length L clearly. Here are the respective connection points 11 or their position in comparison to the line length L in each case with the "number" of the associated bypass line 8th characterized. On the one hand, one recognizes the individual bypass lines 1 to 3 ( 4 ) respectively 1 to 5 ( 5 ) according to the previous procedure compared to the corresponding bypass lines 1' to 3 ' respectively. 1' to 5 ' according to the invention. The associated distances are marked A or B 1 , B 2 to B 6 .
  • If one considers the respective distances B i with i = 1 to 6 according to the variant of 5 opposite the respective bypass line 8th applies, so that results in the 6 illustrated diagram. While according to the prior art with a constant distance A corresponding to the dashed hori zontal over all bypass lines 8th with the numbers 1 to 5 is worked, the distance B i between the respective bypass lines according to the invention changes 8th with the numbers 1' to 5 ' as shown. It can be seen that the longitudinal distance B i of the bypass lines 8th - starting at the transition piece 9 from the supply line 6 to the consumer management 5 - Is getting smaller, and linear, like the 6 opens.
  • The course of the pressure loss between two adjacent bypass lines 8th follows according to the representations in the 3 to 5 approximately a root function over the longitudinal distance B i between the two bypass lines 8th or over the longitudinal distance of the first bypass line to the transition piece 9 , That is, the pressure loss curve essentially follows the regulation
    Figure 00120001
    ,
  • Starting from the 4 and 5 have the respective pressure loss characteristics between adjacent bypass lines 8th or between the first bypass line 1 and the associated transition piece 9 above a maximum, which is arranged approximately in the middle of the associated distance B i and A, respectively. This respective maximum value M 1 to M 6 according to the conventional procedure increases linearly. By contrast, the asymmetrical longitudinal sequence of the bypass lines realized according to the invention 8th achieved that the associated maximum values M 1 ' , M 2' , etc. approximated to one in the 4 and 5 each dashed lines are horizontal. This horizontal marks at the same time the maximum pressure drop in the hydraulic supply line 5 . 6 , which due to the lack of linear increase of the associated maximum values M ' i below that in symmetrical longitudinal sequence of the bypass lines 8th lies. This expresses the difference of the respective pressure loss maxima Δp max in the 4 and 5 out. The compensation curve connecting the respective maximum values M 1 to M 6 thus conventionally extends in a linearly increasing manner, whereas according to the invention it represents approximately a constant (M 1 ' to M 6' ).
  • This is achieved by the location of the respective connection points 11 the bypass lines 8th to the supply line 6 varies and the associated result of the pressure curve .DELTA.p is graphically displayed and / or measured. In this case, the respective longitudinal distance B i between the bypass lines 8th to each other or the first bypass line 8th to the connection point 9 varies so that the resulting pressure loss curves and their maximum values M ' i define a nearly horizontally extending compensation curve for establishing a maximum pressure drop. This can be done manually or automatically.
  • In the former case, the pressure loss curves after variation of the position of the connection points 11 each represented graphically, like this the 4 and 5 demonstrate. Then, the distance B i can be varied manually until the desired result of a nearly horizontal course of the maxima M ' i with i = 1, 2, 3, etc. is reached. Of course, this routine can also be automated in such a way that the pressure loss curves each mathematically differentiated and the position of the maximum M ' i is determined. This routine is run through until the individual maxima M ' i are located within a narrowly specified corridor, so that the balancing curve or curve connecting the maxima M' i runs almost horizontally and reaches a fixed value for the pressure loss maximum p max leads.
  • In both cases of automatic or manual optimization of the position of the maxima M ' i to each other (if possible on a horizontal, ie with substantially the same value of the associated pressure loss Δp), the actual pressure loss curves can be recorded empirically by simulation or by measurements. A combination is also conceivable.
  • At the bypass lines 8th each are T-stubs 8th , which by means of T-shaped connecting pieces in the respective connection point 11 to the supply line 6 are connected. The supply line 6 may in turn be designed as a pipeline with a two-layer structure, wherein the inner tube made of stainless steel and the outer tube may be made of steel. As a supply line 5 In contrast, a hose line is regularly used, which is equipped with steel inserts to achieve the necessary mobility.
  • Finally, it has been shown that by optimizing the length l of the respective hose garland and consequently the supply line 5 as a whole, pressure losses can be reduced. In fact, for example, a 10% extension of the length l corresponds to an almost equal reduction in the pressure loss Δp. That is, it is approximated: Δp α Δl.
  • Consequently, an optimization strategy must also be used in the hose garlands in order to set the pressure losses Δp as small as possible. The aforementioned approximately linear relationship between the pressure loss and a change in length is also immediately obvious. Because as a result of the arcuate or loop-shaped character of the tubular garland or the supply line 5 as a whole, there are pressure losses Ap, which are mainly due to internal friction of the fluid on the hose walls or duct walls in general. Assuming that these frictional losses in each tube section are approximately equal, it is immediately apparent that as the length .DELTA.l is reduced, the internal friction losses will automatically decrease accordingly and consequently the pressure loss .DELTA.p will be minimized.

Claims (10)

  1. Method for pressure control in mining hydraulic supply lines ( 5 . 6 ), in particular for optimizing a pressure drop in long distance supply lines, after which the respective hydraulic supply line ( 5 . 6 ) at least one supply line ( 6 ) and an attached consumer line ( 5 ), which several consumers ( 1 ) supplied with a hydraulic medium, and after which one or more additional bypass lines ( 8th ) the supply line ( 6 ) in addition to the consumer 5 ), characterized in that the bypass lines ( 8th ) in asymmetrical longitudinal sequence the supply line ( 6 ) with the consumer 5 ) connect.
  2. A method according to claim 1, characterized in that the longitudinal spacing (B i ) of the bypass lines ( 8th ) to each other - beginning at a transition piece ( 9 ) from the supply line ( 6 ) to the consumer line ( 5 ) - gets smaller and smaller.
  3. A method according to claim 1 or 2, characterized in that the respective pressure loss between two adjacent bypass lines ( 8th ) approximates a root function over the associated longitudinal distance (B i ).
  4. Method according to one of claims 1 to 3, characterized in that the respective pressure loss over the longitudinal distance (B i ) of two adjacent bypass lines ( 8th ) has a maximum value (M ' i ).
  5. A method according to claim 4, characterized in that the maximum values (M ' i ) of the individual pressure loss curves between the adjacent bypass lines ( 8th ) are connected together by a compensation curve.
  6. Method according to one of claims 1 to 5, characterized in that the location of respective connection points ( 11 ) of the bypass lines ( 8th ) to the supply line ( 6 ) and consequently their respective longitudinal spacing (B i ) to each other is varied so that the pressure loss curves resulting therefrom and their maximum values (M ' i ) define a nearly horizontally extending compensation curve for establishing a pressure loss maximum.
  7. Method according to one of claims 1 to 6, characterized in that the respective bypass line ( 8th ) as a T-branch line ( 8th ) is formed, which by means of a T-shaped connector executed in the connection point ( 11 ) to the supply line ( 6 ) connected.
  8. Method according to one of claims 1 to 7, characterized in that it is in the consumer ( 1 ) around shields ( 1 ) is a progressive route development.
  9. Method according to one of claims 1 to 8, characterized in that the supply line ( 6 ) is designed as a pipeline, in particular high pressure pipeline.
  10. Method according to one of claims 1 to 9, characterized in that the consumer line ( 5 ) as a hose line, in particular as an expansion ( 2 ) suspended garland, is executed.
DE200510001994 2005-01-15 2005-01-15 Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series Expired - Fee Related DE102005001994B3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200510001994 DE102005001994B3 (en) 2005-01-15 2005-01-15 Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510001994 DE102005001994B3 (en) 2005-01-15 2005-01-15 Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series

Publications (1)

Publication Number Publication Date
DE102005001994B3 true DE102005001994B3 (en) 2006-04-13

Family

ID=36089140

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200510001994 Expired - Fee Related DE102005001994B3 (en) 2005-01-15 2005-01-15 Process to control a pressure drop in hydraulic power cables in mines has feed cable, consumer cable coupled to bypass cables which connect the consumer and feed cables in assymmetric series

Country Status (1)

Country Link
DE (1) DE102005001994B3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104279A (en) * 2012-12-10 2013-05-15 辽宁鑫丰矿电设备制造有限公司 Unit frame for assembly frame of fully-mechanized coal mining hydraulic support frame

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1921438A1 (en) * 1969-04-26 1970-11-12 Kloeckner Werke Ag Hydraulic circuit for robbing and setting stamps of the moving longwall mining
DE10019384A1 (en) * 2000-04-19 2001-10-31 Hamacher Karl Gmbh Method for producing a compound pipe for transport of fluid media involves application of high internal pressure to bring the loosely fitting pipes into contact with one another at least at certain points

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1921438A1 (en) * 1969-04-26 1970-11-12 Kloeckner Werke Ag Hydraulic circuit for robbing and setting stamps of the moving longwall mining
DE10019384A1 (en) * 2000-04-19 2001-10-31 Hamacher Karl Gmbh Method for producing a compound pipe for transport of fluid media involves application of high internal pressure to bring the loosely fitting pipes into contact with one another at least at certain points

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FÜSSER,Bernd Dr., "Möglichkeiten zur Verminderung eines Druckabfalls in Strebversorgungsleitungen, Glückauf 140, Nr.9, 2004, S.423-427 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104279A (en) * 2012-12-10 2013-05-15 辽宁鑫丰矿电设备制造有限公司 Unit frame for assembly frame of fully-mechanized coal mining hydraulic support frame
CN103104279B (en) * 2012-12-10 2014-08-27 辽宁鑫丰矿电设备制造有限公司 Unit frame for assembly frame of fully-mechanized coal mining hydraulic support frame

Similar Documents

Publication Publication Date Title
US9903190B2 (en) Modular fracturing system
EP0681353B1 (en) Means and method for placing cable within coiled tubing
US6772840B2 (en) Methods and apparatus for a subsea tie back
RU2513733C2 (en) Assembly of hydraulically-driven twin-tractor
US6755253B2 (en) Pressure control system for a wet connect/disconnect hydraulic control line connector
EP1802844B1 (en) Method for laying pipes without digging trenches
DE60014146T2 (en) METHOD AND SYSTEM FOR REMOVING AND CONTROLLING DEPOSITS IN A MULTIPHASE LIQUID CURRENT
CA2769774C (en) Multiple well treatment fluid distribution and control system and method
US7708078B2 (en) Apparatus and method for delivering a conductor downhole
CN100594290C (en) Mine machinery with detachable guide part and guide part for it
US4585061A (en) Apparatus for inserting and withdrawing coiled tubing with respect to a well
US20030145998A1 (en) Flowline jumper for subsea well
US7090086B2 (en) Extendible boom with removable hydraulic hose carrier
US3237438A (en) Pipe line laying apparatus
BRPI0714797A2 (en) Modified Christmas Tree components and associated methods for using flexible tubing in a well
CA2381281C (en) Apparatus for optimizing production of multi-phase fluid
US8622140B2 (en) Jet pump and multi-string tubing system for a fluid production system and method
DE102008002926B3 (en) Apparatus for connecting pipes subject to axial length changes
BR9714732A (en) System for drilling and completing multilateral wells
CN104676108B (en) A kind of method for designing of steel immersed tube over strait
US3955599A (en) Apparatus for bending a flowline under subsea conditions
US3595312A (en) Method and apparatus for installing offshore flow lines
US6868902B1 (en) Multipurpose reeled tubing assembly
US10494898B2 (en) Systems and methods for fracturing a multiple well pad
NZ295592A (en) Replacing underground pipes: hydraulic jack pushes new pipe behind cone expander which breaks up old pipe

Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee