Long-distance large-diameter pipeline reserved manhole and using method thereof

Abstract

The invention discloses a long-distance large-diameter pipeline reserved manhole and a using method thereof, and belongs to the technical field of chemical equipment.The long-distance large-diameter pipeline reserved manhole comprises a manhole well, an outer cover with a flange and a conveying pipeline, a lower flange is arranged on the upper portion of the manhole well, and the upper portion of the lower flange is fixedly connected with the outer cover with the flange through a set of fixing sealing pieces; a through hole is formed in the middle of an outer cover with a flange, a pressurizing metal rod is placed in the through hole, threads are arranged on the upper portion of the pressurizing metal rod, the pressurizing metal rod is locked through an internal thread pressure adjusting nut, the lower portion of a manhole well is fixedly connected with a conveying pipeline, symmetrical first lifting lugs are arranged in the middle of the pressurizing metal rod, and the lower portion of the pressurizing metal rod is fixedly connected with an inner cover. A circular fixing groove is formed in the conveying pipeline, an inner cover is arranged on the circular fixing groove and fixed through a fixing bolt, and a graphite gasket is installed between the inner cover and the circular fixing groove. The technical problems that an existing long-distance pipeline is inconvenient to weld and poor in purging effect are solved, and the device is mainly applied to chemical pipeline conveying.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a reserved manhole for a long-distance large-diameter pipeline and a method for using the same. Background technique [0002] With the rapid development of my country's economy, people's requirements for quality of life are getting higher and higher, and the requirements for chemical production are becoming more and more stringent. Giantization, energy saving and environmental protection have become the trend of the times in chemical production. Therefore, the upgrading of chemical equipment has been carried out in China, among which the increase in the diameter of the chemical transmission pipeline and the extension of the pipeline distance are more significant. However, the application of long-distance large-diameter pipelines has many difficulties, and these problems are more difficult and are not suitable for comprehensive promotion. and apply. [0003] First of a...

AI Technical Summary

Problems solved by technology

[0003]First of all, welding is an important construction process for long-distance large-diameter pipelines, and the quality of the last weld is difficult to guarantee. In the actual construction process, internal welding cannot be carried out. The final confirmation of the seam is usually done by taking pictures of the weld on the outer wall or a large number of surfacing welding on the outer wall. However, as the length and diameter of the pipe increase, the thickness of the pipe wall will inevitably increase, and the phenomenon of unilateral welding rework of the last weld is more common Generally; secondly, it is difficult to guarantee the blowing effect of long-distance large-diameter pipelines before they are put into use. The common passive method in China is to increase the pressure and flow of purge gas, and carry out long-term and multiple blasting and blowing, but for too long pipes, there is no flange connection The effect of pipe purging is not ideal; and some long-distance and large-diameter pipes that circulate low-temperature or high-temperature media are difficult to pre-cool and preheat before being put into use, and the thermal expansion and contraction of long-distance large-diameter pipes will increase with distance and The increase in pipe diameter increases exponentially, and the feed side of the pre-cooling / preheating medium enters the discharge side and has been completely vaporized / condensed. It is difficult to balance the heat at the two ports, and a larger amount of pre-cooling medium is charged. A large amount of materials waste and even pollute the environment; of course, there are some long-distance large-diameter buried pipelines during the maintenance of the inner wall dirt that need manual cleaning operations, low-point liquid drainage operations, material filling and exhaust operations, etc. are difficult to achieve, or the implementation cost is relatively high. big

At present, there is no design and related data reports for manholes reserved for long-distance and large-diameter pipelines. We need a brand-new design to solve the difficulties of existing technologies

Images