Construction scheme of the hottest FRP storage tan

2022-08-06
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Construction scheme of FRP storage tank

overview:

China Italy FRP Co., Ltd. in 1986 "The potential is huge. The company introduced the most advanced automatic fiber winding FRP tank forming equipment from sarplast company, one of the four largest FRP production groups in the world. It is the first production unit of automatic fiber winding FRP tank equipment in China, creating a new era in the development of China's FRP industry. After several years of digestion, absorption, improvement and cooperation with domestic colleges and universities, the process of the equipment is guaranteed It is getting higher and higher. Now Zhongyi has reached the seventh version of the production line, which solves the problem that domestic materials realize design parameters through production parameters and ensures product quality

reference standards and specifications for FRP storage tank production:

jc/t filament wound reinforced plastic storage tank

q/zy05-1995 field wound large storage tank with glass fiber reinforced thermosetting resin

jc? Alkali free twistless glass fiber yarn

hgj glass appearance characteristics glass steel pipes and fittings

gb general rules for performance test methods of fiber reinforced plastics

gb liquid unsaturated polyester resin for glass fiber reinforced plastics (FRP)

production inspection and test methods of FRP storage tanks:

gb3845-83 test methods for Barcol hardness of fiber reinforced plastics

gb test method for insoluble content of glass fiber reinforced plastics

gb test method for resin content of glass fiber reinforced plastics

gb test method for specific gravity of glass fiber reinforced plastics

gb test method for tensile properties of glass fiber reinforced plastics

gb test method for flexural properties of glass fiber reinforced plastics

gb7193 Test method for 25 ℃ gel time of unsaturated polyester resin

main raw and auxiliary materials for production of FRP storage tank:

FRP, as a fiber composite material, is an engineering material with glass fiber as reinforcement and synthetic resin as matrix. The properties of FRP composed of different glass fibers and different synthetic resins are different. Only by selecting materials reasonably and scientifically, using their strengths and avoiding their weaknesses, can the advantages of FRP be brought into full play. According to the working conditions and process requirements of the equipment in the project, the following materials are selected:

4.1 lining resin:

vinyl resin for FRP storage tank production. The resin has medium viscosity and high reactivity, and is suitable for manufacturing FRP products with high mechanical properties. The resin has excellent corrosion resistance to acid and alkali salts, good thermal stability and high toughness. It is a high-quality material for impermeability and corrosion resistance of storage tanks

after curing, the properties of the resin are:

performance data unit

tensile strength 80 mpa

tensile modulus of elasticity 3500 mpa

fracture elongation 4.8%

flexural strength 130 mpa

flexural modulus of elasticity 3600 mpa

impact strength 19 kj/m^2

thermal deformation temperature 82 ℃

4.2 structural resin:

production temperature of FRP storage tank over 80 ℃ vinyl resin, The resin has medium viscosity and high reactivity, and has good mechanical properties, which is well matched with the winding glass fiber. The resin has high fracture elongation and impact strength, which can effectively prevent surface cracking in the production and use of products. At the same time, it has the characteristics of fast curing, and the products have good strength and toughness. The performance of the cured resin is:

performance data unit

tensile strength 80 mpa

tensile modulus of elasticity 3700 mpa

fracture elongation 3%

flexural strength 144 mpa

flexural modulus of elasticity 3800 mpa

impact strength 18 kj/m^2

thermal deformation temperature 85 ℃

4.3 FRP tank outer protective layer resin

FRP tank is designed to resist the corrosion of the service environment, The outer wall is made of m-benzene type lining resin to make a protective layer to prevent the pipeline structure layer from becoming invalid due to environmental erosion

4.4 glass surface felt:

the glass surface felt of Kaifeng glass fiber products factory in Henan Province is adopted, with the specification of 30g/m^2, Technical parameters are as follows:

performance data unit

unit weight 30 ± 5 g/m^2

tensile strength ≥ 10 n/50mm

organic content%

moisture content ≤ 0.9%

soaking time (2 layers) ≤ 10 s

4.5 alkali free twistless glass fiber roving for FRP storage tanks

alkali free twistless direct glass fiber roving is used for tank drawing, i.e. fw258d? 2400tex, Shandong Taian glass fiber company edr240 - t901? 2400tex, cqr-469/cqr-451? 2400TEX。 The products of the above specifications are formed by one-time large leakage plate drawing, which has uniform fiber tension and no drapability compared with alkali free winding ply yarn; It can be quickly and thoroughly soaked in resin; Good wear resistance, no hairiness under operating conditions; Excellent mechanical properties

physical and mechanical performance parameters of glass fiber wound products of FRP storage tank:

index name index

circumferential tensile strength (MPA) 389

axial tensile strength (MPA) 74.2

circumferential modulus of elasticity (MPA) 29 × 103

axial elastic modulus (MPA) 10 × 103

water absorption (%) 0.18

surface curing degree (bacol) 42

specific gravity (g/cm3) 1.9

note: see the attached test report for details

laminated structure characteristics of storage tank:

the structure of FRP storage tank is generally composed of four layers: inner lining, secondary inner layer, reinforcing layer and outer protective layer

the function of the inner lining of FRP storage tank: it is usually a resin rich layer composed of glass fiber surface felt and lining resin, and the resin content is more than 90%. It is an anti-seepage and anti-corrosion layer with good air tightness and high finish

the function of the secondary inner layer of FRP storage tanks: (also known as the intermediate corrosion resistant layer) is usually reinforced by lining resin plus alkali free glass fiber jet yarn, with a resin content of more than 75%. In addition to being corrosion-resistant, its main function is to protect the inner lining, which can protect or prevent the crack propagation of the inner lining

structural layer of FRP storage tank: the structure resin is wetted with alkali free and twistless glass fiber winding yarn and then wound in a circular and cross direction. The resin content is 35 ± 5%. The function is to bear various stresses and external loads. The wall thickness is finally determined by the designers of our company by referring to the technical specifications and engineering drawings provided by you, using the software and database imported from Italy, and according to the design specification of filament wound FRP, through reasonable and scientific calculation of the product's circumferential stress, axial stress and bending Poisson's ratio

the outer surface layer protects the tank from external mechanical damage and atmospheric aging. Its composition is the same as that of the inner surface layer and can be combined with the structural layer

design calculation sheet (based on dn2800 × 5600 hydrochloric acid storage tank as an example):

(1) main calculation parameters:

working medium: 26%kcl

medium characteristics: no

operating pressure: hydrostatic pressure

operating temperature: 50 ~ 70 ℃

design temperature: 70 ℃

strength safety factor = 8

allowable maximum strain:[ ε]= 0.1%

stability safety factor =3

(2) design basis

jc/t filament winding reinforced plastic storage tank

cd130a hand lay up FRP equipment design technical conditions

astm D standard for glass fiber winding reinforced thermosetting resin chemical resistance storage tank

(3) material parameters

strength material parameters

material category strength (MPA)

FRP 98.1

elastic material parameter

material category modulus of elasticity (GPA)

FRP 13

(4) the structural calculation model

boundary condition is at the bottom of the tank, and its constraint is: all simply supported

the working pressure is subject to hydrostatic pressure

(5) strength analysis

stress analysis under design pressure: 4. Start the oil pump motor

maximum stress: σ Hmax = 5.6 mpa

safety factor = 98.1/5.6=17.5>8

(6) stiffness analysis

overall displacement under water pressure

maximum displacement =0.623mm

2) deformation analysis:

maximum stress: σ hmax = 5.6Mpa

ε max=5.6MP/13GP=0.43%

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