About the surface area calculation of pipe fittings?

The main calculation formula of the installation project valuation table is 1. No matter how many times the transformer oil is filtered until it is qualified, the unit of measurement is "T", and its calculation formula is: oil filtering amount (t)= equipment oil weight (t)×( 1)+ loss rate.

2. Calculation formula of strip bus: L=∑ (single extension meter calculated according to design drawings+reserved bus length)

3. The installation length of foundation channel steel angle should be calculated according to the design drawings. If it is not specified, it shall be calculated according to the following formula: ① For a single cabinet panel: L=2(A+B)② When multiple cabinet panels of the same specification are connected: L=n2A+2B, where: l: required length a: width b: thickness n: number of cabinets or screens.

4. Calculation formula of wiring length of cabinet: L= half circumference of cabinet × number of wiring loops.

5. Calculation formula of cable installation quantity: L=∑ (horizontal length+vertical length+various reserved lengths) ×( 1+2.5% cable bending margin coefficient).

6. Calculation formula of protective tube: crossing highway: L= subgrade width+4m; Through the drainage ditch: L= outer edge of the ditch wall+1m; Vertical laying: the nozzle is+2m away from the ground; Through the external wall of the building, press+1 m outside the foundation edge.

7. The reference formula for determining the number of intermediate heads of power cables: n=L/l- 1 n: the number of intermediate heads L: the design length of cables L: the average length of each cable.

8. Engineering quantity formula for laying grounding bus and lightning rod: L=∑ (horizontal length+vertical length of construction drawing design) ×( 1+3.9% additional length).

9. The formula for calculating the number of wires passing through electrical piping is L= (calculated length of piping+reserved length of wires) × number of wires with the same section.

The calculation formula of overhead line conductor erection quantity below 10 and 10KV: L= (total line length+all reserved lengths) × conductor number.

1 1. The production and installation of air ducts are calculated according to the development areas of different specifications in the construction drawing, and the areas occupied by inspection holes, measuring holes, air supply openings and air suction openings are not deducted. Circular tube F=π×D×L, where f is the expanded area of circular air duct (m2); D—— the diameter of circular air duct; L—— length of pipeline centerline. Rectangular duct is calculated by multiplying the circumference of the chart by the length of the center line of the duct.

12, rust removal and oil brushing project.

(1) formula for calculating the surface area of equipment cylinder and pipeline: s = π× d× l, where π-pi; D—— diameter of equipment or pipeline; L—— Equipment barrel height or pipeline extension meter.

(2) The valve surface area calculation formula S = π× d× 2.5d× k× n, where d is the diameter; k—— 1.05； N—— Number of valves.

(3) The calculation formula of elbow surface area is s = π× d× 1.5d× k× 2π× n/b, where d is the diameter; k—— 1.05； N—— number of elbows; The value of b is: 90 elbow b = 4；; 45 elbow b = 8.

(4) Formula for calculating flange surface area: s = π× d× 1.5d× k× n, where d is the diameter; k—— 1.05； N- number of flanges.

(5) The calculation formula of corrosion engineering quantity at the flange front of equipment and pipeline: s = π× (d+a )× a, where d is the diameter; A—— Flange flanging width.

(6) Calculation formula of anticorrosion (or oil brushing) amount of equipment with heads: s = l×π× d+(d [] 22 )×π× 1.5× n, where n is the number of heads; 1.5- coefficient value.

13, insulation quantity.

(1) The calculation formula of thermal insulation, moistureproof and protective layer of equipment cylinder or pipeline: v = π× (d+1.033δ )×1.033δ.

S = π× (d+2. 1δ+0.0082 )× L where d- diameter1.033,2.1-adjustment coefficient; δ —— the thickness of insulation layer; L—— the length of equipment cylinder or pipeline; 0.0082—— Tie line diameter or steel strip thickness.

(2) Calculation formula of thermal insulation quantity of heat tracing pipeline: ① Single pipe heat tracing or double pipe heat tracing (when the pipe diameter is the same and the included angle is less than 90). D' = d1+D2+(10 ~ 20mm), where d' is the comprehensive value of the heat tracing pipeline; D 1- diameter of main pipeline; D2 —— diameter of heat tracing pipe; (10 ~ 20 mm)-the gap between the main pipeline and the heat tracing pipeline. ② Double-tube heat tracing (when the pipe diameters are the same and the included angle is greater than 90). D ′ = d1+1.5d2+(10 ~ 20mm) ③ Double-tube heat tracing (when the included angle of different diameters is less than 90). D' = D 1+D +( 10 ~ 20 mm), where D '- comprehensive value of heat tracing pipeline; D 1- diameter of main pipeline. Substitute the above d' calculation results into the corresponding formula, and calculate the number of insulation layer, moisture-proof layer and protective layer of heat tracing pipeline.

(3) Calculation formula of engineering quantity for heat preservation, moisture prevention and protective layer of equipment head. v =[(D+ 1.033δ)/2]2π× 1.033δ× 1.5×N S =[(D+2. 1δ)/2]2×π× 1.5×N

(4) Calculation formula of valve insulation, moistureproof and protective layer. v =π(D+ 1.033δ)×2.5d× 1.033δ× 1.05×N S =π(D+2. 1δ)×2.5d× 1.05×N

(5) Calculation formula of flange heat insulation and moisture-proof protective layer. v =π(D+ 1.033δ)× 1.5d× 1.033δ× 1.05×N S =π×(D+2. 1δ)× 1.5d× 1.05×N