Internal Floating Roof (IFR)

Brick Style Honeycomb Type with Full Contact

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Third-Party Certification

 

IFR Honeycomb Floating Panel

  • Hi-tech aerospace technology is used to design the honeycomb floating panels with high-strength, making it a highly reliable product.
  • Third party SGS test result: it can stand up to 1267kgf

     (Sample size: 200x200mm, hydraulic machine is used to apply uniform pressure.)

  • Discountinous honeycomb floating panel, light weight and high buoyancy:                      API 650 gravity standard 0.7 / floating panel gravity (panel weight 12500g / panel volume (5x58x290)cm3)
  • This calculation is based on standard panel buoyancy and reaches 4.7 times its dead weight.
  • The liquid will not infiltrate the honeycomb core because the 4 corners of the floating panel are fully welded. Gas leaking test is used in all 4 corners to ensure 100% sealing. Afterwards, the panels are marked with coding numbers, and delivered to the customers.

 

IFR Support Leg

  • The support legs work independently from the floating roof and will not damage the whole structure.
  • Third party SGS stress test result for support leg's structure shows that it can support 2988kgf.
  • The support leg, support leg well and support leg pad can automatically adjust by themselves when resting on the tank bottom.
  • The upper part of the support legs have socks to prevent the VOC emissions. The socks materials depend of the stored liquid.

 

IFR Structure

  • The floating roof and the support legs are joint by beams to form one continuous strong structure. This structure is tested by SGS, and can support 1200kgf (more than 12 persons can safely walk anywhere on the roof).
  • 3rd party SGS oscillation test: the test frequency range: from 60-110 times/min and lasted for 1h. There were 5100 shakings. When the test was completed no deformations occured.
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(3) VOCs損耗比對(試算及實測)

VOCs 公式計算

公式來源

依照EPA-AP 42 Chapter 7,由EPA與API多年實際經驗得出的公式標準

計算依據

直徑:20 m              儲液:naphtha(石腦油)

概估溫差:平均最高溫為15 ℃ ,最低溫為3℃

容積:5000 m³         週期:7天一循環    

日均太陽幅射能量:1135btu/ft²  day.

 

無安裝內浮頂
損失計算分為兩項: 

  1. 儲存損失(standing storage loss)
  2. 工作損失(working loss)

依計算公式年總揮發損失約 205.3 t/yr

 

安裝浮筒式內浮頂
由於接液面積太少,EPA-AP 42並無計算非全接液之公式,暫以下列數據進行計算參考:
  ●浮筒直徑:0.24 m    ●浮筒長度:2.9 m    ●浮筒數量:56根
  ●按浮力標準為2倍,浮筒剛好沉入液面一半進行計算,

    其覆蓋面積為 D*L*Q = 0.24*2.9*56=38.976 m2
  ●20 m油槽截面積 = 314.159 m2
  ●浮筒式實際覆蓋率僅 38.976/314.159 = 12.4 %
  ●因此約有85 %無覆蓋面積會產生揮發


以此推算浮筒式內浮頂的損失約為 174 t/yr
    (無安裝內浮頂之年度揮發量205 t,按比例計算:205*0.85=174 t)

 

安裝磚式全接液蜂窩內浮頂
有兩種工作情況:
1.第一種(LT)為正常工作狀況(Normal operation),是內浮頂隨油槽內的介質上下     浮動。分為四種損失:
    ◆邊緣密封損失(rim seal loss)         ◆出槽損失(withdrawal loss)
    ◆浮頂部件損失(deck fitting loss) 

    ◆浮頂表面密封損失(deck seam loss)
2.第二種(LTL)為站立狀況(Roof standing),是指當油槽內介質存量降低到比內浮     頂支撐腿高度低時,內浮頂在油槽內處於站立狀態。下分為兩種損失:
    ◆閒置站立損失(standing idle loss)    ◆入槽損失(filling loss)


基於公式計算損失約為 2.2 t/yr

 

  • 上述20 m浮筒式內浮頂揮發計算年損失≒174 t,換算每日損失,174÷365≒0.47 t
  • 換算體積(以比重1計算)每日損失高度0.47÷(10x10x3.1416) ≒ 0.0015m (1.5 mm)
  • 反推∅20m儲油槽,使用液位量油裝置測量,每天油槽只要損失高度1.5 mm,即損失了約 470 kg/day

 

液位高度損耗對比方式

環境條件
●地點:中國東北(盤錦)    
●直徑:20 m
●容積:5000 m³
●儲液:naphtha(石腦油)
●週期:8天一測量
●概估溫差:平均最高溫為15℃,最低溫為3℃
●日均太陽幅射能量:1135btu/ft² day.

●採完全靜置,測量期間無進出料及任何作業。


■採用磚式全接液,實際檢測記錄推估對比使用浮筒式,

  每年多節省116 t,有效抑制揮發降低環境污染亦減少爆炸危險。

 

VOCs濃度測量

環境條件
●地點:台灣宜蘭    ●日期:2015/03/19    
●直徑:17.38 m     ●容積:3000 m³
●儲液:M-xylene(間二甲苯)
●總儲存高度12.127m,測量時高度9.5m
●罐體無環向通氣孔(會產生累積濃度)
●進液後靜置9天測量
●使用 Thermo Environmental Instruments TVA-1000 測量

 

 

 

 

 

 

 

 

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何謂內浮頂?

  • 簡單說就是使用在儲液槽罐內跟著液面上下浮動的屋頂。
  • 它因直接覆蓋於液面上,阻絕液體與空氣直接接觸,能有效減少儲存液體形成氣體揮發逸散。
  • 所以內浮頂與儲液面接液面積越完整效果越好。

 

 

 

 

Reasons for using Internal Floating Roofs (IFR) -

                                 Brick Style Honeycomb Type with Full Contact

  • Brick Style Honeycomb Type floating panel with high-strength structure:
    1.2t/ft2 plane compression. One floating panel buoyancy is over 4 times its dead weight load.
  • The stored liquid will not infiltrate to the honeycomb core because the 4 corners of the floating panels are fully welded. Gas leaking test is used in all 4 corners to ensure 100% sealing.
  • The frame design forms a stable structure. All floating panels are bolt-free, puncture-freem and every single unit can be replaced individually.
  • Two-way automatic vent design to balance the pressure during filling and withdrawal operations, and to prevent the floating roof from severely shaking.
  • All the parts can be put into the tank through the manhole.
  • Easy to install in a short time.
  • The structure is very strong, supporting more than 12 persons walking anywhere on the roof, exceeding API 650H requirements.
  • The Full Contact design can reach over 90% of VOC emissions reduction.
  • The related tests are measured and certified by third party: SGS
  • Meets NFPA 11 requirements
  • Meets API 650H requirements