Plugging leaks under pressure

The plugging of leakage points under pressure in our equipment is carried out by professionals. In terms of location, there are the valve middle flange, end flange, or welds on the pipeline. Technicians conduct on-site surveys and measurements; after the fixtures are manufactured by the designated manufacturer, glue is applied to the leakage points (we usually use 18# sealant).

Let’s talk about the leaks we’ve fixed. The locations of these leaks were: flanges, sand holes in pipes, pipe welds, and pipe tees. The clamps used to seal these leaks were made by us, and 18# sealant was used for sealing as well

The full name of pressure-based leak sealing is “rapid pressure-based leak sealing without shutting down pipelines or containers or interrupting fluid flow.” It has now become a standard practice in this field. This industry deals with corrosion, perforations, and leaks in various types of pipelines and containers, including those used in the oil, refining, ethylene production, chlor-alkali industries, gas sector, chemical industry, power plants, paper mills, ships, as well as in residential settings. This method can effectively address such issues at pressures up to 30 MPa (with the pressure reduced to 5 MPa during installation and then increased again after completion), and at temperatures up to 900 degrees Celsius (during installation, GBF-17A heat-resistant suits must be worn). The media that can be handled include oil, water, gas, steam, various gases, sulfur, concentrated acids, alkalis, highly corrosive substances like benzene, and various chemicals. 　　In this industry, there are ten technical processes including injection sealant application, steel belt tensioning, wrapping and bundling, quick plugging using clamps, cold welding for repair, plugging valve flanges, blocking oil and gas theft valves, pipeline repair, and sealing the reduction gears of pumping units. 　　In this industry, there are a total of 160 types of pressure-containing leak-sealing tools, products, materials, and protective gear, which have become specialized and standardized. 　　The principle of leak sealing under pressure is as follows: Leak sealing under pressure refers to the process of stopping leaks in pipes and containers that are under pressure, i.e., those containing or transporting fluids at pressures above atmospheric pressure, due to corrosion, perforations, leaks, or damage caused by human error. This is done without interrupting the flow of fluid or transferring it to another container, and it involves sealing the leak while the fluid is still in motion inside the system. Methods such as welding or electric grinding, which generate sparks, can often be used for this purpose, as there is no concept of working without generating heat in the context of leak sealing under pressure. However, in actual leak sealing operations, flammable and explosive substances are often present, and such substances must not generate any sparks at all. As a result, in China, pressure-based leak sealing methods were gradually replaced by methods that allow sealing under pressure without using fire. This approach makes it clearer to define the essence of this industry. Although people tend to simplify it to just \"pressure-based leak sealing,\" today the term \"pressure-based leak sealing\" is understood by most people to refer to sealing under pressure without the use of fire. Since the industry of leak sealing under pressure has not been standardized, there are various terms used to describe it. Most people consider leak sealing under pressure to be a form of injection-based sealing, but in reality, injection-based sealing is just one of the techniques employed in this field. It can only be used for leak sealing on straight pipes, which limits its applicability; it is ineffective in cases involving tees, elbows, reducers, flange roots, and large containers. In order to establish unified terminology and standards for the pressure-based leak sealing industry, Shanghai Guangben Industrial Co., Ltd. has developed the \"Enterprise Standard for Pressure-Based Leak Sealing Without Welding.\" This standard details ten technical processes used in this industry, as well as providing a comprehensive list of leak sealing products, guidelines for leak sealing protection, standards for related terminology, rules for on-site organization and management during leak sealing operations, and methods and techniques for preparing budgets related to leak sealing.

“The injection-type sealing technique can only be used to seal leaks under pressure on straight pipes, which is quite limited; it is ineffective in cases such as tees, elbows, reducers, flange roots, and large containers. ”The claim is false. Injection-type leak sealing is currently the most widely used method for sealing leaks. Its applicability depends on the design of the clamps at the location of the leak; it is not true that injection-based leak sealing cannot be used in areas such as tees, elbows, reducers, flange roots, or large containers.

Plugging leaks under pressure is carried out when there is really no other option. Common examples include welds, flange joints, and rolled steel strips. Different methods and adhesives are used depending on pressure, temperature, and the medium involved.

Plugging leaks under pressure is only a temporary solution and cannot be relied on in the long term. In many areas of our company, acid corrosion has caused problems, and we have to use plugging methods to address them; during major repairs, it is essential to strengthen inspections of those areas where leaks have occurred

Sending a few images related to pressure-based leak sealing for sharing: 20090408215306062.png (42.22 KB) 2009-4-8 22:13 20090408215342359.png (75.87 KB) 2009-4-8 22:13 20090408215834234.png (41.48 KB) 2009-4-8 22:13