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Brief introduction of SF double wall oil storage tank

  1. Product Overview

SF double tank full name of “double steel-reinforced fiberglass tanks”, in 2005  from Japan to introduce China. This product is mainly used to store chemical solvents and petroleum products, and can be widely used in enterprises and units such as chemical industry, printing and dyeing, ink, gas station, and so on. This product fills the gap in the domestic market. Compared with the single-layer iron oil tanks currently widely used in China, it has a significant improvement in quality and life.

Relevant standards for double-layer oil tank products:

GB/T150-1998 “Steel Pressure Vessel” GB/T4735-1997 “Steel Welded Atmospheric Pressure Vessel”

JB/T4709-2000 “Rules for Welding of Steel Pressure Vessels”

GB985-88 “Basic Forms and Dimensions of Gas Welding, Manual Welding, Gas Welding, Weld Groove” JB4730-94 “Nondestructive Testing of Pressure Vessels”

Also refer to relevant foreign standards:

The application of the Japanese fire hazard No. 66 related to the regulations of double-layer oil tanks made of reinforced glass fiber US UL58/UL1746

  1. Structural characteristics and working principle

The structure of the SF double-layer oil tank is formed by the steel inner shell of the underground storage tank and the FRP outer layer forming the dangerous leak detection layer . At the same time, a leak detection tube for leak detection of dangerous substances is installed in the inner shell.

The double-layer structure made of steel-reinforced glass fiber adopts a patented processing method between the inner steel shell and the outer reinforced glass fiber layer, so that a gap of 0.1mm is generated between the inner and outer layers. The objects only flow in the gaps, and will not immediately overflow the external pollution environment, which is highly efficient and environmentally friendly. At the same time, the oil tank is equipped with a leak detector. Once a leak occurs inside, the sensor can sense the leakage flow to generate a buzzer alarm to ensure that the user stops using it and repairs it in time. Fundamentally cut off the possibility of various accidents after the dangerous logistics out of the outside world.


  1. Technical characteristics

Three major characteristics of S/F double-layer oil tank-safety

Inner layer-made of 6-8mm thick Q235-B steel plate, compared with the ordinary single-layer oil tank with a thickness of only 5mm , the strength is greatly improved;

Outer layer——Strengthened glass fiber layer, the thickness is more than 4mm , it has strong corrosion resistance and electric corrosion resistance;

employed between double patented technology to reach 0.1mm gap, to eliminate the root causes of security the presence of the full risks;

The three major characteristics of S/F double-layer oil tank-environmental protection

The glass fiber shell can fully protect the internal steel shell from external corrosion. Ordinary single-layer steel oil tanks are buried in the ground all year round and are eroded by groundwater and electrolytic corrosion, so the service life is very short, depending on the environment they have only 5 to 10 years of service life, and the oil tanks are easily damaged after corrosion Cracking, leading to leakage of content items; and the glass fiber shell on the outside of the S/F double-layer tank is sprayed with special resin and reinforced glass fiber spray yarn at one time, and subjected to multiple tests such as pressure reduction to ensure that the outside is completely sealed. During use, no water vapor enters the interior and erodes. At the same time, glass fiber is an insulating object, so

To electrolytic corrosion does not occur, thus ensuring that the tank can be at least double in a normal environment 30 years in the.

Double-layer structure, with a 0.1mm gap in it, the outer layer FRP ensures that the leakage will not directly leak the polluted soil and water source;

The outer FRP will not cause electrolytic corrosion with groundwater, saltwater, etc.;

The outer FRP will not corrode with gasoline, diesel, leaded gasoline;

The leak detector can monitor the whole process for 24 hours to eliminate the hidden danger of pollution ;

Leakage detection system facilitates the detection and maintenance of oil tanks and protects the original ecological environment of the soil;

Effective protection of the environment, eliminating the high cost of environmental management in the later period.

Three characteristics of S/F double-layer oil tank——Economy

The high safety and environmental protection performance of the S/F double-layer oil tank also indirectly reduces the user’s cost of use . After using this product, it is not necessary to build an underground oil storage room, and the oil tank can be directly buried underground for use. Ordinary single steel oil tank and need to be repaired annually detected, increasing maintenance time and costs, and a double inner steel tank there is no need for detection, only 3 in a secondary housing made of glass fiber surface inspections And, even if there is an abnormal phenomenon, you can use the same material to repair a small area, saving time and effort. So that produce goods greatly reduce the customer’s use of the comprehensive cost.

The service life of the S/F double-layer oil tank is 5-10 times that of ordinary oil tanks , at least to ensure safe use  30 years.lEasy installation, greatly shorten the construction period and reduce cost investment.

The remote monitoring system is convenient for daily and regular inspection, digital control, eliminating manual and complicated operations;   l The maintenance requirement of the S/F double-layer oil tank is 1/10 of the ordinary oil tank , which greatly saves the maintenance investment cost;

The utilization rate of the S/F double-layer oil tank is greatly improved compared with the ordinary oil tank, which ensures the high- efficiency use of the equipment and the cost-effective product;

L S / F. Efficient use of double tanks, significant protection, and energy saving, energy leakage eliminates the tape to severe losses.

  1. Dimensions and specifications

Standard product specifications:

FGS -20KL : length 6869mm diameter 2100mm highest point 2300mm

FGS -30KL : length 7280mm diameter 2400mm highest point 2600mm

FGS -40KL : length 8588mm diameter 2600mm highest point 2800mm

FGS -50KL : length 10088mm diameter 2600mm highest point 2800mm

FGS -50KL : 8896mm in length, 2800mm in diameter, 3000mm in highest point and other customized models

Main accessories: (except bare tank)

  1. Leak detector (one alarm control box, four detection sensors)
  2. Manhole blind
  3. Manhole operation well
  4. Bandage
  5. Rubber pad
  6. Apply bolts

5 . On-site inspection project details

SF double tank in the factory have done rigorous testing and testing, the user must access the site by rigorous testing and validation according to the following items.

  1. Visual inspection

Visual inspection is to observe the FRP of the outer layer of the oil tank see if there is any damage.

  1. Instrument testing

When the instrument testing is carried out, it must be carried out jointly by users, manufacturers, and related quality management departments. The main items are as follows:

  1. a) Thickness detection

Use an ultrasonic thickness gauge to check whether the thickness of FRP meets the specified requirements.

  1. b) Pinhole detection

Use a high-pressure pinhole detector to detect whether there are pinhole defects on the surface of the oil tank.

  1. Pressure detection

The pressure test is to confirm whether the pressure of the oil tank is consistent with the pressure of the shipment. This confirmation is checked by the customer every day after the oil tank reaches the scene.

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