Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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Fig. 2.11 How the pipes are produced a permanent metal mould (a chill mould) which is cooled from the outside by water and which does not need a thermally insulating covering. One chill mould can be used to cast as many as several thousand pipes, depending on their nominal size. The sudden quenching of the liquid cast iron against the water-cooled chill mould produces just a single solidification front, facing towards the wall of the chill mould, which makes the microstructure particularly fine-grained and dense. After heat treatment to transform the microstructure (Fig. 2.12), it is possible to obtain appreciably higher strength in the grey cast iron pipes than can be obtained in pipes cast in sand moulds. The length of the Fig. 2.12 pipes went up to five or six metres, and the wall thickness went down and became more uniform. Shortly after the centrifugal casting process made its breakthrough, the new joint-making technique was invented (see section 2.3), and after that the leadsealed socket could only be a thing of the past. 13
Properties of ductile cast iron pipes In today‘s typical pipe foundry, the cast iron for producing the pipes is smelted in a cupola furnace, is adjusted to a preset composition by tailored metallurgical procedures and is raised to the requisite casting temperature. This is followed by the treatment with magnesium to produce ductile cast iron and the melt, having been treated in this way, is then at once cast into pipes. The outcome of the developments that took place over the 0 years between 1920 and 1970 was that the tensile strength of pipes could be raised and their weight and wall thickness halved. As development of the production technology has continued, and above all with modern-day systems for controlling the casting machines, it has been possible for a considerable further reduction to be made in the wall thickness of the pipes. Account has been taken of this in the product standards EN [2.1] and EN 98 [2.2], where a shift can be seen from classification by wall thickness to classification by pressure class. 1
Page 1 and 2: Buderus Ma
Page 6 and 7: 1. Introduction Introduction When t
Page 10 and 11: At x 100 magnification, these graph
Page 12 and 13: 10 3 kp cm Fig. 2.7 Steel Ductile G
Page 16 and 17: 2.3 Development in the joint-making
Page 18 and 19: joints is DVGW Arbeitsblatt GW 3 8
Page 20 and 21: Longitudinal force-fit joints and t
Page 22 and 23: Longitudinal force-fit joints and t
Page 24 and 25: 2.3.2 Making the BLS ® joint Makin
Page 26 and 27: Fig. 2.21 Left lock Catch Right loc
Page 28 and 29: 2.4 Inside and outside protection I
Page 30 and 31: Inside and outside protection the c
Page 32 and 33: Reference documents [2.8] Gaebelein
Page 34 and 35: General What is said above is true
Page 36 and 37: Other pluses that the two technique
Page 38 and 39: Fig. 3.5 Hydraulic unit The press-p
Page 40 and 41: 3.2 The auxiliary pipe technique Th
Page 42 and 43: In the final stage of the operation
Page 44 and 45: 3.4 Requirements for the site Requi
Page 46 and 47: Reference documents
Page 48 and 49: Both the variants of the burst lini
Page 50 and 51: During the pulling process, the tra
Page 52 and 53: 4.3.2 Joints As in virtually all tr
Page 54 and 55: Reference documents 3
Page 56 and 57: Fig. 5.3 Assembly of the string of
Page 58 and 59: the outlet nozzles. In rocky soils,
Page 60 and 61: 5.3 General requirements Companies
Page 62 and 63: A prerequisite for this procedure i
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Table .1 provides an overview of th
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Installations Nominal size DN lengt
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Reference documents [ . ] DVGW Arbe
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Fig. 6.2 Traction vehicle Fig. 6.3
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6.4 Joints The longitudinal force-f
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Areas of application, advantages an
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Reference documents 7
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7. 2 A description of the technique
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Buderus Giesserei
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Fig. 7.8 Pushing in a pipe A descri
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7.5 Reference installations No. Loc
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[7. ] Rink, W.: Langrohrrelining mi
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In the second step, the pilot is up
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8.3 Outside protection Outside prot
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8.6 Reference documents [8.1] Richt
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A consideration of the economics of
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A consideration of the economics of
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[9.2] DVGW-Hinweis W 09: Auswirkung
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BLS ® restrained joint DN 80 to DN
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Technical data sheets 101
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General Pipes must not be: • drop
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Filling in the pipe pit DN 80 - DN
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DN 80 - DN 00 BLS ® joints There m
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Use of clamping ring joints DN 80 -
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Notice on assembly DN 80 - DN 00 BL
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Retrospective application of weldin
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11.2 Installation instructions for
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Inserting the locking segments DN 0
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Angular deflection DN 00 - DN 1000
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Disconnecting BLS ® joint disconne
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Shrink-on devices and protective ta
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ZMU Before a pipe is cut, the ZMU s
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ZMU 127
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129
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131
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Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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