I’m a complete novice here; I hope everyone will be kind enough to offer their guidance

I’ll only give a brief overview; the detailed aspects rely on experience, so one should seek advice from experienced craftsmen and show respect for them. In the initial stage, it is important to pay attention to control plans and requirements, system control specifications, point counting, requirements regarding the remaining number of points, specifications for instrument selection, material requirements for instruments, cable requirements, and so on. Communicate with the equipment manufacturer to determine whether they can meet your needs; if there are any application examples, check how well those systems have performed in practice. During the construction phase, focus on product inspection upon arrival, organization of relevant documents, and installation inspections

From personal experience, when communicating with either party, it is important to keep in mind several key aspects regarding the selection of instruments: 1. Provide a comprehensive overview of the operating conditions: including the instrument’s range, ambient temperature, operating temperature, operating pressure, output signal, on-site wiring, installation method, corrosiveness of the medium, whether explosion protection is required, and the required explosion protection rating as well as the protection level； 2. Brand of the instrument: domestic or imported, small manufacturers or large manufacturers, brand replacement ； 3. Price of instruments, total budget for the project ； 4. Applicability of the instrument ； 5. Instrument operability ； 6. Are the after-sales services and repairs for instruments convenient?

Points to note during the construction period: 1. Check whether the instruments supplied by the supplier match the purchase list and meet the requirements for use on site； 2. Are all the various installation accessories for the instrument available in full? ； 3. During construction, it is necessary to ensure that the connections of instruments are safe and reliable; for example, instruments installed with flanges should be equipped with gaskets as well as jumper wires ； Is the threaded seal of the pressure sensor reliable? ； Should the level gauge be installed vertically or at an angle, and is it in contact with the bottom of the container? ； Wait, according to the instruments selected, list out the precautions for each stage of the construction period ； 4. Safety issues during construction: whether installation is carried out while the system is powered on, or under pressure ； Are there any safety measures for working at heights? ； 5. After the instruments are installed, before powering them on for testing, check that all wiring is in order by verifying each item against the drawings.

This is a rather broad issue that relates to the main tasks of the instrumentation field throughout almost the entire engineering process. Here are some of my humble personal opinions: 1. What aspects should be covered during the initial discussions with the design team, and what issues need attention? The initial communication with the design institute took place in two phases: before and after the contract was signed ； If a design contract has not yet been signed, the communication at this stage is primarily aimed at understanding the design firm’s level of familiarity with the project in question and its past performance, as well as the experience of the key designers who will be involved. It also involves discussing whether both parties share similar views on the key professional issues, in order to build a relationship that will serve as a foundation for cooperation during the actual design process. If the contract has already been signed, the top priority at this stage is to reach a consensus on unified design standards, in order to lay a solid foundation for the subsequent design work ； Next is the arrangement by designers regarding schedules and timelines, especially the delivery dates for order forms and technical specifications, which are related to the progress of orders and the subsequent submission of design drawings ； Again, it is important to establish good personal relationships of trust with the key designers, in order to reduce friction and conflicts at work. What should be taken into consideration when communicating with equipment manufacturers in the medium term? Communication with the equipment manufacturers usually takes place after receiving the order form and the technical specifications (initial version); of course, for projects that are well-known, communication can take place in advance as well ； At this stage, the goal is to gain an understanding of the technical specifications of the other party’s equipment as well as its application in similar projects. Relevant documents such as contracts, technical agreements, data sheets, and customer certificates are examined, in order to get a preliminary idea of the manufacturer, processing capabilities, delivery times, shipping methods, payment and warranty terms, as well as after-sales service – all of which are necessary to prepare for signing a contract. What aspects should be considered during the construction period? The key point during this period is to obtain two preliminary drawings in advance before the drawings are delivered: one is the tray layout diagram, and the other is the material list ； The material list is primarily used to understand the types and approximate quantities of steel sections, in order to prepare for the advance submission of certain types of steel sections. Once the steel sections arrive, it is possible to prefabricate supports such as junction boxes and insulation boxes, in order to urge the construction team to start work and to have the necessary workers available for the installation phase. The tray box drawings are primarily used to confirm the design plan; if necessary, the original design is modified to ensure it is reasonable and suitable for meeting the tight deadlines. Tender documents for the tray boxes are prepared in advance, and a centralized bidding process is carried out to guarantee an adequate supply of materials for construction at an early stage. Once the conditions are met, the trough box installation can be carried out in stages to ensure that the conditions for laying the main cables are available as soon as possible. These two measures can save approximately one month’s worth of time.