1. Is the measurement of liquid flow. 2. Measured the main characteristics of the liquid, such as chemical corrosion, viscosity and specific gravity. System back pressure. 4 suitable suction height. 5. Other options required, such as analog control, pulse control, flow monitoring and timer. What are the main advantages of electromagnetic driven metering pump? Electromagnetically driven metering pumps have only one moving part - the armature shaft. Generally, the less moving parts, the more reliable the metering pump works. Metering pump is ideal for low-flow, low-pressure workplaces, and good compensation in the supply voltage fluctuations. And fixed frequency, change the stroke length of the metering pump, the fixed stroke length, change the frequency of the metering pump What are the advantages? By calibration, the dosing amount for each stroke is known. The total dosage can therefore be calculated (dosing = dosing per stroke * frequency). The total dosage is linear with frequency (50% frequency = 50% dosing). Through external pulse or analog control, dosage can be transferred from minimum to maximum in one second. In addition, it is much less costly than motor-driven stroke length adjustment. How to use the performance curve of the metering pump? 1. Find the performance curve corresponding to the selected metering pump. 2. Indicate the current back pressure in the chart below. 3. Determine the correction factor, taking the backpressure value in bar, up to the curve, and read the correction factor vertically left at the intersection. 4. Divide the required dosage value by the correction factor to give the value in ml / min. Or L / h. Put the calculation result in the middle of the dosage scale. 6. When placing this value on the dosing scale, use a ruler to find the stroke length setting and stroke frequency setting.
Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion of seawater, electrochemical corrosion and corrosion of marine organisms and microorganisms; the hull is subjected to large wind and wave impacts and alternating loads; the shape of the ship is complicated by processing methods, etc. Steel for hull structure is strictly required. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, forming properties and surface quality are required.
Shipbuilding Steels Our hot rolled shipbuilding steel is produced in accordance with the relevant Classification Society, examples of which include Lloyds Register and Det Norske Veritas.
Our steel products include steel shipbuilding plate, fabricated steel sections and floor plate for decking. We can also supply bulb flats for plate stiffening, structural steel angles and inverted angles.
Our plates are supplied under the ASTM/ASME specification (ASTM A131 / ASME SA 131) which is the standard specification for Structural Steel for Ships. We offer higher strength shipbuilding steels as standard .High strength steels offer significant cost advantages by reducing the weight of the structure in comparison to the steel used.
The plates are suitable for use in the construction of container ships and large cargo freighters as well as commercial shipping lines such as luxury cruise ships and ferries. Supply options include heavy plates, surface treated plates and pre-fabricated sections. In most cases, the steel can also be supplied as hot rolled coils or cut into lengths (sheets).
These high yield materials are commonly used in the construction of hulls and superstructures for large shipping vessels. The grades are exclusively for shipbuilding use as set out in the standard.
Marine Steel Plate,Ccs Marine Steel Plate,Ship Building Steel Plate,Ah36 Marine Steel Plate Shandong Guanzhou Iron and Steel Group Co., Ltd , https://www.shansteelsupply.com
What information is needed to properly select a metering pump?