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Selecting the appropriate branch bench specification for a particular piping system requires a combination of factors, and the following are specific points:
Piping parameters
Pipe Diameter: The nominal diameter of the standpipe bench needs to match the pipe diameter of the main and branch pipes. Usually, the large end of the standpipe is connected to the main pipe and the small end is connected to the branch pipe, to ensure that its inner diameter is equal to the outer diameter of the main pipe and the branch pipe or can be achieved through the appropriate fittings to achieve a tight connection. For example, if the diameter of the main pipe is DN200 and the diameter of the branch pipe is DN50, it is necessary to choose a branch pipe table with DN200 at the big end and DN50 at the small end.
Wall thickness: The wall thickness of the pipe determines the wall thickness requirement of the branch pipe table. According to the wall thickness of the main and branch pipe to select the branch pipe table, so that its wall thickness can withstand the pressure in the pipe, and with the strength of the pipe level to ensure the strength of the connection and sealing. For example, in the high-pressure piping system, the pipe wall thickness is larger, and the wall thickness of the branch pipe table needs to be increased accordingly.
Pressure level: Select the pressure level of the branch pipe bench according to the design pressure of the piping system. The pressure level of the standpipe should not be lower than the maximum working pressure of the piping system to ensure that no leakage or rupture occurs due to high pressure and other safety accidents during operation. For example, for a piping system with a design pressure of 10MPa, a branch standpipe with a pressure rating of 10MPa or higher should be selected.
Fluid Characteristics
Medium type: Different fluid media have different requirements for the material of the branch pipe bench. If the transport is corrosive media, such as acid, alkali, etc., you need to choose corrosion-resistant stainless steel or alloy steel branch pipe table; if the transport is flammable and explosive media, it is necessary to consider the material and sealing performance of the branch pipe table to ensure safety.
Temperature: fluid temperature will affect the material and performance of the branch pipe table. High-temperature fluids need to support the pipe table has good high-temperature performance, you can choose high-temperature alloy materials; low-temperature fluids should be considered to support the low-temperature toughness of the pipe table, to prevent the occurrence of brittle cracks in the low-temperature environment. For example, in the delivery of high-temperature steam piping system, should be selected to withstand the corresponding temperature of the branch pipe table.
Flow rate: Higher flow rate of fluid may produce a larger scouring force on the branch pipe table, so it is necessary to select a larger wall thickness, higher strength branch pipe table to reduce scouring wear and prolong the service life. For example, in some high-speed gas conveying pipelines, the anti-scouring performance of the stub table should be considered.
Installation conditions
Space location: The installation space determines the type and size of the stub table. In places where space is limited, it may be necessary to choose a compact branch pipe table, such as socket welded branch pipe table; while in occasions where space is more plentiful, you can choose butt-welded branch pipe table. At the same time, the length and height of the standpipe bench should be considered to ensure that it will not interfere with other equipment or piping after installation.
Installation method: According to the installation requirements of the piping system to choose the appropriate branch pipe platform installation method. Common installation methods include welding, threaded connection, ferrule connection and so on. Welded branch pipe table connection is of high strength but difficult to install; threaded connection and ferrule connection are easy to install, but are suitable for occasions with lower pressure. For example, in some piping systems that require frequent dismantling, threaded or ferrule connections can be selected for the branch pipe bench.
Industry standards and norms
National standards: When choosing a branch pipe bench, you must follow the relevant national standards, such as GB/T 19326, etc., to ensure that the size and performance of the branch pipe bench meet the national requirements.
Industry standards: Different industries have different requirements for pipe supports, such as SH/T 3410 for petrochemical industry and DL/T 695 for electric power industry. It is necessary to select the branch pipe table according to the standards and norms of the specific industry to meet the special needs of the industry.
Economy
Initial investment: the price of branch pipe table of different specifications and materials varies greatly, under the premise of meeting the requirements of the piping system, the initial purchase cost should be considered comprehensively. For example, stainless steel branch pipe table price is relatively high, if the pipeline system does not require high corrosion resistance, you can choose the lower price of carbon steel branch pipe table.
Operation and maintenance costs: choose a reliable quality, stable performance of the branch pipe table, although the initial investment may be higher, but can reduce the later maintenance and replacement costs, reduce the branch pipe table failure caused by production interruption and other losses.