SPRA120
the
synthesis of peptides, deoxyribonucleic acid (DNA) are widely use the Solid-phase
synthesis, as the key process in the production of Bio-pharmaceuticals. The
synthesis method is to bound the functional group such as aminomethyl, hydroxymethyl
on a bead, which primiarly is polystyrene microsphere with low crosslink.
uniform
distribution of the functional groups:The
functional groups are bonded uniformly on the monodisperse beads.
Resins For Solid Phase Synthesis Spra120 Resins For Solid Phase Synthesis Spra120,Resin Synthesis,Spra120 Solid-Phase Synthetic Resin,Spra120 Synthetic Resin Nanjing Genshine Bio-technology Co., Ltd , http://www.genshine-bio.com
[Asia Pump Network News] will be demolished vertical pipe centrifugal pump a wide range of applications, mainly for industrial use. For metallurgy, chemicals, textiles, wood processing, paper and hotels, bathrooms, hotels and other high-temperature hot water boilers circulating heating and urban heating system heating pump. Urban high-rise building water supply, fire pipeline pressurization, HVAC hot and cold water circulation, long-distance water and the production process of circulating pressurized transmission. The following is a small series to share with you all the demolition of vertical pipe centrifugal pump installation and installation precautions, I hope we can bring help. Will be demolished vertical centrifugal pump installation First, the key installation technology Centrifugal pump pipe installation technology is the key to determine the installation of the centrifugal pump suction stroke. This height refers to the vertical distance from the surface of the water source to the centerline of the centrifugal pump impeller. It is not confused with the allowable suction height. The allowable vacuum height indicated on the pump manual or nameplate means the vacuum value on the water inlet section of the pump, But also at 1 standard atmospheric pressure, the water temperature of 20 ℃, the test was measured and determined. It does not consider the condition of the water flow after the water supply pipe is matched. The pump installation height should be allowed to suck vacuum height deducted after the loss of suction pipe head, the remaining part of the value, it is necessary to overcome the actual terrain water absorption height. Pump installation height can not exceed the calculated value, otherwise, the centrifugal pump will not pump water. In addition, the impact of the calculated value is the size of the suction pipe lift loss lift, it is appropriate to use the shortest pipe layout, and try to install less elbow and other accessories, but also consider the appropriate with some larger diameter pipes to reduce the flow rate within the pipe. It should be noted that the pipeline centrifugal pump installation site elevation and water temperature is different from the test conditions, such as the local elevation of 300 meters or more than the water temperature is pumping water, the calculated value to be amended. That is, the atmospheric pressure at different altitude and the saturated steam pressure above 20 ℃. However, when the water temperature is below 20 ℃, the saturated steam pressure is negligible. From the pipeline installation technology, water pipes require strict sealing, can not leak, leaking, or will undermine the centrifugal pump inlet at the vacuum, so that the centrifugal pump to reduce the amount of water, even when the pump is not pumping. Therefore, we should conscientiously do the work of the interface of the pipeline to ensure the construction quality of pipeline connection. Second, centrifugal pump installation considerations Centrifugal pump installation should pay attention to the following basic issues: (1) The surface of the base must be installed, clean and can withstand the corresponding load. (2) Use anchor bolts where needed. (3) Anchor bolts must have sufficient strength for vertically mounted pumps. (4) If mounted vertically, the motor must be above the pump. (5) When fixed on the wall, pay attention to find the right. Selection and Installation Centrifugal pumps should be selected according to the liquid being delivered and to check the required performance, analysis of suction, discharge conditions, intermittent operation or continuous operation. Centrifugal pumps should normally be operated at or near the pressure and flow rates specified by the manufacturer's design. Pump installation should be carried out the following review: ①The basic size, location, elevation should meet the design requirements, anchor bolts must be properly and correctly fixed in the concrete foundation, the machine should not be missing parts, damage or corrosion, etc .; ② According to Pump the characteristics of the transmission medium, if necessary, should check the main parts, shaft seals and gasket material; ③ pump leveling, find work should be consistent with the provisions of equipment and technical documents, if there is no provision should be consistent with the existing national standards " Mechanical equipment installation engineering construction and acceptance of common norms "provisions; ④ all connected with the pump pipe, pipe fittings and lube oil pipeline cleaning requirements should be consistent with the relevant national standards. The use of centrifugal pump test run the pump should meet the following requirements: ①drive the steering should be the same with the pump steering; ② identify the pipeline pump and coaxial pump steering; ③ The fixed connection parts should be no loose, the lubrication parts plus Note the specifications and quantity of lubricant should be consistent with the provisions of the technical documents of the equipment; ④ pre-lubrication requirements of the site should be pre-lubricated; ⑤ all instrumentation, safety devices should be sensitive, accurate and reliable; ⑥ crank should be flexible , No abnormalities; ⑦ high temperature pump should be preheated before the test run, the temperature should rise evenly, the temperature rise per hour should not exceed 50 ℃; pump the surface of the process medium with a working medium inlet temperature difference should not be greater than 40 ℃; ⑧ set to eliminate the impact of temperature rise of the connection device, set the bypass connection device to provide cooling water. Centrifugal pump operation should pay attention to the following points: ①prohibit the anhydrous operation, do not adjust the suction port to reduce the displacement, prohibit the operation of the flow is too low; ② monitoring operation, completely prevent packing box leakage, when changing the packing box With a new packing; ③ to ensure that mechanical seals have a full flush of water flow, water-cooled bearings prohibit the use of excessive water flow; ④ do not use too much lubricant; ⑤ check the recommended cycle. Establish operating records including operating hours, packing adjustments and replacements, adding lubricants and other maintenance measures and times. Centrifugal pump suction and discharge pressure, flow, input power, lotion and bearing temperature and vibration conditions should be measured regularly recorded. ⑥ Centrifugal pump host is relying on the atmospheric pressure will be low water pumping to a height, while the atmospheric pressure can only support about 10.3m of water column, so the host of centrifugal pumps leave the water 12 meters can not work. Further reading: industry leaders IFAT China Guangzhou Exhibition building water pump manufacturers ranking article belongs to Internet industry (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network Editor: gogoing (QQ / WeChat:) Starting: http://beng.liuti.cn/ (Service Hotline:)