In order to make the glass curtain wall project safe, technically advanced, and economically reasonable, the Ministry of Construction of the People's Republic of China issued the industry standard “Technical Specifications for Glass Curtain Wall Engineering†on November 14, 2003, and standardized the materials, design, and production of the glass curtain wall project. Installation construction and acceptance. The wind pressure resistance of the glass curtain wall is determined according to the method specified in the current national standard GB/T15227 "Test method for wind pressure deformation of building curtain walls". The wind-resistance performance of the curtain wall refers to the ability of the curtain wall to maintain its normal function without any damage under the vertical wind load. The rating value of the wind-resistant performance of the curtain wall is the instantaneous wind pressure when the relative deflection value of the main bearing member or the supporting structure reaches the specified value, that is, the instantaneous wind pressure of 3 seconds. The wind-resistance performance of the curtain wall should be greater than the standard value of the wind load it withstands. Usually the span of the beam is small and the corresponding stress is also small. The Ministry of Construction stipulates that the thickness of the main beam section should meet the “When the span of the beam is not more than 1.2m, the thickness of the main section of the aluminum alloy section should not be Less than 2.0mm; When the span of the beam is greater than 1.2m, the thickness of the main section of the section should not be less than 2.5mm." In order to maintain the reliability of the direct force screw connection and prevent the self-tapping screws from being pulled out, the local cross-sectional thickness should not be less than the nominal diameter of the screw when the force is connected. The thickness of the main section of the column section shall comply with the “thickness of the open section of the aluminum profile shall not be less than 3.0 mm, and the thickness of the closed part shall not be less than 2.5 mm; when the profile wall is directly connected with the screw by a threaded force, The local thickness should not be less than the nominal diameter of the screw." The smaller value of the thickness of the main section of the column is mainly based on the provisions of the national standard "aluminum alloy construction profiles" GB/T 5237 on the smaller thickness of the profile for the curtain wall is 3.0mm, for the closed box section, due to the Good resistance to local instability performance can be achieved with smaller wall thicknesses, thus allowing the use of smaller profiles with a wall thickness of 2.5 mm. In actual production, engineering design units often rely on the relevant provisions of JGJ102-2003 “Technical Specifications for Glass Curtain Wall Engineering†to calculate that the selected aluminum alloy profile wall thickness does not meet the requirements of GB/T5237-2000 “Aluminum Alloy Building Profilesâ€, resulting in production. Manufacturers produce products according to customers' design drawings but do not meet national standards. Because the standard clauses are conflicting or unsuitable, the aluminum profile manufacturers, engineering design institutes and customers are confused. At the same time, because of the rigid regulations on wall thickness, a considerable portion of aluminum resources are wasted. 4DBJ15-30-2002 "Specifications for Design, Construction and Acceptance of Aluminum Alloy Doors and Windows Projects" In order to meet the needs of construction projects, the performance of aluminum alloy doors and windows meets the requirements of architectural functions and guarantees the quality of aluminum alloy doors and windows. In response to the climate characteristics of Guangdong Province and the actual conditions of project construction, Guangdong Provincial Department of Construction was established in October 2002. Japan's local standard DBJ15-30-2002 “Guidelines for the design, construction and acceptance of aluminum alloy doors and windows†was promulgated on the same day to regulate the design, construction, and acceptance of aluminum alloy doors and windows for industrial and residential buildings in Guangdong Province. Mandatory Clause 3.2.2 stipulates that “the wall thickness of the main profile of aluminum doors and windows shall be determined by calculation or test, and the measured wall thickness of the main section of the door profile shall be not less than 2.0?. The main force of the window profile shall be smaller. The measured wall thickness should not be less than 1.4?â€. For aluminum alloy profiles production enterprises, aluminum alloy doors and windows are its downstream products, the next process is the customer, the engineering design, construction and acceptance specifications are the basic requirements of customers, and are the preconditions for the application of aluminum alloy profiles in the production of windows and doors. Therefore, in the design, production, and quality inspection of aluminum alloy door and window profiles, it is necessary to clearly identify the main profile and the main force components of the section. The so-called main force components, refers to the door and window facade to withstand and pass the door window and its own gravity and horizontal wind load and other forces of the central cross-box, the middle mullion, fan and other main profile, as well as a combination of doors and windows to fight framed profiles. The main section of the so-called profile section is the main part of the cross-section of the main profile of the door and window, the connection part of the web, the flange, or the fixed other components that are subjected to the vertical and horizontal load forces. Clearly identify the main sections and the main force components of the section, carry out targeted quality control during the design and production, ensure that the product meets the relevant requirements of the "aluminum alloy doors and windows project design, construction and acceptance specifications", but also can reasonably control the production cost And customer engineering manufacturing costs.
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Sealand have DN03 to DN150 size meters and are developing bigger models. Each meter can be connected with your computer through a USB-to-RS485 converter. The detail steps are as follows. Connect the meter and computer with a USB-to-RS485 converter( converter A+ end to transmitter A+ end, B- to B-, and GND to GDN); turn to device manager of the computer to check COM port connected with meter. Start the software, select the right COM port and click Connect; do not change any other parameters (if you do not know the right one, click Automatic options on the left, click Connect, plug & unplug the transmitter, and then check if it is connected). You can click Connect on the tool bar to disconnect or connect again. It will shown Connected/Not Connected at the bottom of this interface.
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