Tube sheet are usually made of a round flat plate with holes drilled into the plate to accommodate tubes in the exact location and pattern relative to each other. The tube sheet is used to support and isolate the tubes in the Shell And Tube Heat Exchanger.
A tube sheet is a plate used to support a tube in a shell and tube heat exchanger. The tubes are aligned in a parallel manner and are supported and held in place by the tube plate. A tube sheet is a round plate with holes in it so that the tube can fit through the opening. Tubes are usually made of round, flat metal sheets. Drill holes for pipe ends in precise locations and patterns relative to each other. The tube plate is made of the same range of materials as the pipe.
These are usually made of mild steel and vary in thickness according to fluid pressure. Depending on the final application (petrochemical, nuclear, oil and gas, etc.), the tubes can be clad in stainless steel or other superalloys, or even made entirely of stainless steel or superalloys.
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As a kind of equipment that plays a role in building construction, building intercom is what people often call "doorbells." In the course of more than two decades of development, building intercoms have gradually entered the direction of networked smart homes, and the structure of intercom products has become more upscale. How should consumers understand digital intercom and analog intercom to better choose?
First, the advantages and disadvantages of analog intercom and digital intercom
1. Interface docking comparison simulation: often self-routing into a separate network system. The industry lacks standards, and products from different manufacturers cannot be interconnected. At the same time, video intercom systems are difficult to interconnect with other weak electronic systems.
Digital: Using TCP/IP, you can borrow a broadband network in your community. Multiple weak electronic systems can share the same broadband network. The network cost is low. The standard interface is used to improve the practicality of the equipment and achieve the unity of the management platform of the community. .
2. Contrast simulation of video transmission: analog intercom in the cell video networking, but when the distance exceeds 1KM, the image quality cannot be guaranteed.
Digital: Digital video intercom is based on the TCP/IP network protocol. Data is shared on the network. The most advanced algorithms and decoding techniques are adopted for video compression and extraction. Even when the distance is long, the image quality is still clear. 
3. Comparison of communication quality simulation: analog talkback is a bus system, is a half-duplex communication mode, when one of the door machine call management center, the other wall machine or sub-management can not be free from existence of a busy line.
Digital: Because it is connected to a broadband network, the center has a switch, and its communication is a full-duplex communication method, which allows multi-channel real-time data exchange, which is not only concise and fast, but also effectively avoids busy lines.
4. Installation and commissioning comparison simulation: There are many networking devices in the analog intercom system, such as networking switchers, interlayer isolators, signal amplifiers, etc. Any device failure will increase the amount of commissioning engineering, and only such manufacturers can provide intermediate devices. The replacement will depend on the manufacturer.
Digital: The digital intercom system adopts the standard TCP/IP protocol, which saves many switch systems and intermediate devices of the intercom system. It is easy to debug and easy to configure and replace. 
5. System maintenance comparison simulation: The traditional analog intercom system must be set up on a device-by-device basis. Failures can only be passively waited for users to be notified to know that system upgrades require professional on-site chip replacement to complete.
Digital: Through the background software, you can complete the setup and test of each device. Through the management center software, you can know the running status of the device at any time. For the upgrade of the system, you can upgrade the terminal automatically through online, without manual intervention.
What is the advantage of digital intercom versus analog intercom?
The building intercom is the "doorbell" that everyone often says. In the course of more than two decades of development, building intercoms have gradually entered the direction of networked smart homes, and the structure of intercom products has become more upscale. How should consumers understand digital intercom and analog intercom to better choose?