Instrument design selection

First, the general provisions for design selection are as follows:

1. The design of the instrument design is based on the premise of satisfying the conditions of the process measurement medium and the process monitoring function, and adopting the instruments that are technically advanced, reliable to use, convenient to maintain and install, and economically reasonable. 2. The following provisions shall be uniformly defined in the design regulations:

Second, the flow meter selection:

1. Concentric orifice plate differential pressure flowmeter is used for DN50 and above DN50; 2. Rotor flowmeter is considered first below DN50; if the above type of flowmeter cannot meet the conditions of process measurement medium, consider other types of flowmeter .

Third, the liquid level instrument selection:

1. Continuous measurement of liquid level - differential pressure level gauge; measuring range is less than 2000mm, differential pressure level gauge is not suitable for the place, according to the situation, the external float level gauge, or other types can be used.

Fourth, the pressure gauge selection:

1. The material and type of pressure gauge and differential pressure gauge should meet the process conditions. 2. The local pressure gauge generally uses a common pressure gauge with a dial size of 100mm or 150mm. 3. Pump outlet - anti-vibration pressure gauge 4. Strong corrosive, easy to crystallize, solid particles, high viscosity fluid - diaphragm pressure gauge (eg Diaphragm-sealed pressure gauge or differential pressure gauge)

Fifth, the temperature instrument selection:

1. Clearly specify the form, specifications and materials of the thermowell. 2. The local thermometer generally uses a bimetal thermometer. 3. In general, the Pt100 thermal resistance thermometer (-200~400°C) is preferred. 4. For special measurement, select the type according to the need. (In the same factory, minimize the type of thermal resistance used)

Sixth, the control valve diameter determination and selection:

1. Control valve Cv value calculation standard and caliber size determination principle. 2. According to the characteristics of the medium, determine the type of valve, actuator, packing and upper bonnet type. 3. According to the characteristics of the control system, determine the internal parts of the valve, accessories, when the instrument power supply source is faulty, to ensure the safety of personal and factory equipment. 4. Control valve material and rated pressure. 5. Control valve body connection mode, sealing surface type. (Safety and relief valve, ibid.)

Seven, alarm and interlock system:

1. Set the sound and light alarm system outside the DCS alarm function to select the function and equipment. 2. The interlocking system used for emergency stop should meet the requirements of its on-site contact and interlocking function, interlock implementation and realized functions.

Eight, the selection of the dashboard

The instrument panel shall make design requirements for the selection and painting requirements, the height of the instrument panel installation instrument, the power supply of the instrument panel and the direction of the instrument panel piping, and the wiring requirements of the instrument panel and the air piping requirements of the instrument.

Nine, DCS selection

DCS shall specify system components, equipment specifications, monitoring function requirements, redundancy, and communications. Provision should also be made for the direction of the control room instrument cable.

Instrument installation material statistics

First, the instrument guide pressure piping materials:

1. Scope: Pipes and fittings required from the process to the measuring line between the instrumentation and the sampling and discharge line. 2. Statistical method: When the process to the point of the instrumentation point has not been confirmed: Design quantity (m) = Estimated quantity = indicates the sum of the quantities on the "meter installation diagram" 3. Statistical method: When the position of the process to the instrument equipment point has been confirmed: (1) For high pressure pipes and / or special material pipes, according to the actual quantity Number of statistical designs (m) = estimated quantity = actual quantity × 1.2 (2) For other pipes, the number of designs can be counted according to the actual quantity = estimated quantity = the sum of the quantities on the "meter installation diagram" 4. Valves and fittings (including Flanges, tees, elbows, joints, reducers, unions, condensing pipes, reducers, bolts, nuts, gaskets, etc.) Design quantity (piece) = actual quantity

Second, the instrument heating material:

1. Scope: including steam heating and return pipes, pipe fittings and electric heat tracing materials. 2. Number of electric heating cable design (m) = estimated quantity = total quantity expressed on "meter installation diagram" 3. number of steam heat tracing tube design (m) = estimated quantity = total quantity indicated on "meter installation drawing" 4. Valves and fittings for steam heating (including flanges, tees, reducers, joints, reducers, nuts, bolts, gaskets, etc.) Design quantity (piece) = estimated quantity = indicated in "meter installation diagram The sum of the numbers on

Third, instrument public works piping materials:

1. Scope: including pipes, valves, pipe fittings, etc. for supplying steam, water, ammonia, etc. to the instrumentation equipment. 2. Pipes (take the pipe between the source valve and each instrumentation device and the discharge port of each instrumentation device) Designation quantity (m) = estimated quantity = quantity statistics on the "meter installation diagram" 3. Pipe fittings (1) valves, traps, tees, reducers Number of designs (pieces) = estimated quantity = quantity statistics on the "meter installation diagram" (2) number of elbows and joint design (pieces) = estimated quantity = number of tubes × 1 (3) number of union designs ( Piece) = estimated quantity = number of tubes ÷ 5 (4) number of flange designs (pieces) = estimated quantity + actual quantity = estimated number of flanges × 0.5 + actual quantity (5) number of nuts and bolts (pieces) = estimate Quantity + actual quantity = estimated number of flanges × 2 actual quantity (6) number of gasket designs (pieces) = estimated quantity + actual quantity = estimated number of flanges × 0.5 + actual quantity

Fourth, instrument gas supply piping materials:

1. Scope: including the pipes and fittings required for the gas supply equipment of the instrument 2. Pipe (the pipe between the source valve and each instrumentation) Design quantity (piece) = actual quantity × 1.23. Pipe (1) gas Source distributor, valve, three-way, reducer, short section design quantity (piece) = actual quantity (2) number of internal thread joint design (piece) = estimated quantity = number of tubes × 1 (3) number of elbow design (piece) = estimated quantity = number of tubes × 0.5 (4) number of joint designs (pieces) = estimated quantity = number of tubes × 0.5 (5) number of flange designs (pieces) = estimated quantity + actual quantity = actual quantity + tube root number × 0.4 (6) bolt and nut design quantity (piece) = estimated quantity + actual quantity = actual quantity + tube root number × 2 (7) number of gasket design (piece) = estimated quantity + actual quantity = actual Quantity + number of tubes × 0.5

V. Instrument pneumatic signal piping material:

1. Scope: refers to the material between the instrument equipment, the connection box and the instrument panel 2. The number of multi-core cable design (m) = the actual number × 1.13. The number of single-core cable design (m) = the quantity of measurement = the actual quantity (determined part ) × 1.1 + actual quantity (uncertain part) × 1.24. Pneumatic tube (cable) Design quantity (m) = quantity of measurement + estimated quantity = quantity indicated on "meter installation diagram" + actual quantity × 1.25. valve fittings ( 1) Number of valves and joints design = actual quantity (2) Number of joint jacket designs (pieces) = actual quantity 6. Number of design of joint tanks (units) = actual quantity

6. Cables and wires:

1. Scope: refers to the cable between the instrument equipment, the junction box, the instrument panel, the terminal cabinet, etc. 2. The main cable (the cable between the site and the control room and the local instrument panel) Design quantity (m) = measurement quantity = Actual quantity × 1.13. Direct connection cable (single group / single pair cable) Design quantity (m) = quantity of measurement = actual quantity (determined part) × 1.1 + actual quantity (uncertain part) × 1.24. Control indoor cable (terminal Cables between cabinets, safety barrier cabinets, cabinets, and consoles) Design quantity (m) = quantity measured = actual quantity × 1.15. Grounding of cables, cables (instrument equipment, junction boxes, local instrument panels, cable trays, etc.) (1) Number of main grounding wire design (m) = quantity of measurement = actual quantity × 1.1 (2) Number of branch grounding wire design (m) = quantity of measurement = actual quantity × 1.2

Seven, steel threading pipe and fittings:

1. Steel threading pipe (1) Number of threading pipe design between junction box and cable tray (m) = metering quantity = actual quantity × 1.1 (2) Cable tray directly to the field instrument equipment, wiring box to the field instrument equipment, site Number of pipe-through design between instrumentation equipment (m)=measurement quantity=actual quantity×1.22. Steel threading pipe fittings (1) Three-way threading box (for condensing water of threading pipe) Design quantity (piece) = actual quantity + Estimated quantity = actual quantity + number of outdoor instrument installations × 0.5 (2) Number of bending pass box design (pieces) = actual quantity + estimated quantity = actual quantity + number of tubes × 0.5 (×0.35) (3) Female threaded joint (Pipe) Design quantity (piece) = actual quantity + estimated quantity = actual quantity + number of pipes to be worn + number of standard bends × 2 (4) number of joint designs (pieces) = actual quantity + estimated quantity = actual quantity + Number of tubes × 0.2 (5) Number of flameproof unions (pieces) = actual number (6) Bushings (caps) Design quantity (pieces) = actual quantity (7) Number of lock nut designs (pieces) = Actual quantity + estimated quantity = actual quantity + number of wearing tubes × 2 ( 8) Number of conversion joint design (piece) = actual quantity (9) Standard number of bend design (piece) = actual quantity + estimated quantity = actual quantity + number of pipes to be worn × 0.2 (10) Flameproof sealed pipe fittings (with seal Cement) Design quantity (piece) = actual quantity (11) number of flexible pipe design (piece) = actual quantity (12) number of plug design (piece) = actual quantity (13) number of straight threading box design (piece) = actual Quantity + estimated quantity = actual quantity + length of line pipe (m) ÷ 30

Eight, wiring materials:

1. Number of junction box design (piece) = actual quantity 2. Number of design of cable seal compression joint (piece) = actual quantity 3. Number of crimped terminal design (piece) = quantity of measurement = actual quantity × 1.24. Bolt type connector Design quantity (piece) = actual quantity 5. Cable label design quantity (piece) = actual quantity × 26. Line number label design quantity (piece) = estimated quantity

Nine, other materials:

1. Cable tray (including cover plate, connecting piece, partition, fastener) Design quantity (piece) = actual quantity (non-through) Design quantity (m) = quantity of measurement = actual quantity × 1.2 (straight type) 2. Number of column design (piece) = actual quantity 3. Number of angle steel design (m) = estimated quantity 4. Number of channel design (m) = estimated quantity 5. Number of steel plate design (m2) = estimated quantity 6. Flat steel design quantity ( m)=estimated quantity

ZGAR PCC

ZGAR PCC

ZGAR electronic cigarette uses high-tech R&D, food grade disposable pod device and high-quality raw material. All package designs are Original IP. Our designer team is from Hong Kong. We have very high requirements for product quality, flavors taste and packaging design. The E-liquid is imported, materials are food grade, and assembly plant is medical-grade dust-free workshops.

From production to packaging, the whole system of tracking, efficient and orderly process, achieving daily efficient output. We pay attention to the details of each process control. The first class dust-free production workshop has passed the GMP food and drug production standard certification, ensuring quality and safety. We choose the products with a traceability system, which can not only effectively track and trace all kinds of data, but also ensure good product quality.

We offer best price, high quality Vape Device, E-Cigarette Vape Pen, Disposable Device Vape,Vape Pen Atomizer, Electronic cigarette to all over the world.

Much Better Vaping Experience!

ZGAR PCC E-Cigarette Vape Pen,ZGAR PCC Device Vape,ZGAR PCC Vape Pen Atomizer,Latest Disposable E-Cigarette OEM vape pen,ZGAR PCC electronic cigarette

ZGAR INTERNATIONAL(HK)CO., LIMITED , https://www.zgarvapor.com