A method for opening holes under pressure on-line for composite plate pressure equipment
A technology for opening holes under pressure and pressure-bearing equipment, which is applied in the field of pressure-bearing equipment maintenance, can solve the problems of base carbon steel damage and safety accidents, and achieve the effects of guaranteed bearing capacity, high reliability and simple operation
Active Publication Date: 2020-04-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0003] Usually, the clad plate material used in pressure equipment is produced by explosive cladding process, but there is a small gap between the base carbon steel and the clad stainless steel. If the online hole opening method is improper, the process medium will gradually penetrate into this gap, resulting in Steel damage, and even induce safety accidents
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[0031] The present invention will be further described below in conjunction with accompanying drawing.
[0032] Such as figure 1 As shown, the present invention provides an online pressurized drilling method for composite plate pressure equipment, wherein the composite plate pressure equipment 7 is covered with an equipment layer 3 , and the equipment layer 3 is covered with an equipment base layer 1 . Usually, the material of the equipment layer 3 is stainless steel, so it is also called a stainless steel layer, and the material of the equipment base layer 1 is carbon steel, so it is also called a carbon steel layer.
[0033] In a preferred embodiment, the material of the equipment base layer 1 is Q245R (carbon steel) with a thickness of 14mm, and the material of the equipment layer 3 is 00Cr 17 Ni 14 Mo 2 (stainless steel), the thickness is 3mm, the size of the connecting pipe 2 with pressure opening is Φ114×8.5mm (outer diameter×wall thickness), and the end of the pipe w...
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Abstract
The invention provides an online pressure tapping method for composite board pressure-bearing equipment. The method comprises the following steps: I, on the premise of not damaging a composite layer of the equipment, excising a part of equipment base layer; II, vertically welding a pressure tapping receiving pipe to an exposed surface of the composite layer of the equipment, forming a composite layer welding part between the pressure tapping receiving pipe and the composite layer of the equipment through welding and carrying out dye penetrant inspection; III, welding a transitional welding part to the composite layer welding part; IV, forming base layer welding parts between the equipment base layer and the pressure tapping receiving pipe and on the transitional welding part through welding and carrying out dye penetrant inspection; and V, carrying out pressure tapping on the composite layer of the equipment through the welded pressure tapping receiving pipe. By excising the equipmentbase layer of a composite board, welding the pressure tapping receiving pipe to the composite layer of the equipment and carrying out pressure tapping, the problems that a process medium enters a gapof the composite board by tapping the equipment directly to lead to corrosion and the like are solved, and the online pressure tapping method has the characteristics of being simple to operate and high in reliability.
Description
technical field [0001] The invention relates to the technical field of pressure-bearing equipment maintenance, in particular to an online pressure-drilling method for pressure-bearing equipment of a composite plate whose inner layer is stainless steel. Background technique [0002] In petroleum and petrochemical plants, many composite plate pressure-bearing equipment with carbon steel as the base layer and stainless steel as the cladding layer are used. However, during the operation of the plant, due to the process and operation and maintenance reasons, it is often necessary to open holes online under pressure. [0003] Usually, the clad plate material used in pressure equipment is produced by explosive cladding process, but there is a small gap between the base carbon steel and the clad stainless steel. If the online hole opening method is improper, the process medium will gradually penetrate into this gap, resulting in Steel damage, and even induce safety accidents. [00...
Claims
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IPC IPC(8): B23P15/00B23P6/00
CPCB23P6/00B23P15/00
Inventor 陈文武黄贤滨刘小辉兰正贵亓婧刘曦泽
Owner CHINA PETROLEUM & CHEM CORP