EVALUATION METHOD FOR COLD RESISTANCE RELAXING MATERIAL USED IN LIQUID STORAGE TANKS

PROBLEM TO BE SOLVED: To provide an evaluation method that can appropriately evaluate the liquid-tightness of cold resistance relaxing material by itself when used in liquid storage tanks.SOLUTION: By an evaluation method for cold resistance relaxing material used in a liquid storage tank T whose tank side wall part Ts is equipped with an inside tank, a heat insulating layer, cold resistance relaxing material, an outside tank and a liquid-proofing barrier 5, loading action processing is done by compressing a test specimen in which a flat-shaped member for testing use, which corresponds to the outside tank, and a member for testing use formed of cold resistance relaxing material and of a member for testing use are arranged in the thickness direction of the flat-shaped member is compressed with set compressive force in a set in a low-temperature state in the thickness direction of the flat-shaped member in the low-temperature state are compressed by a set compressive force and the test specimen are pressed against liquid for testing use in a state of being in contact with the liquid for testing use, followed by checking of the extent of permeation of the liquid for testing use into the member for testing use.SELECTED DRAWING: Figure 1 【課題】冷熱抵抗緩和材単独での液密性を適切に評価できる、液貯蔵タンクに用いられる冷熱抵抗緩和材の評価方法を提供する。【解決手段】タンク側壁部Ｔｓが、内槽、断熱層、冷熱抵抗緩和材、外槽及び防液堤５を備える液貯蔵タンクＴに用いられる冷熱抵抗緩和材の評価方法であって、外槽に相当する試験用の平板状部材と冷熱抵抗緩和材にて形成される試験用部材とを平板状部材の厚み方向に並べた試験体を、設定低温状態にて平板状部材の厚み方向に向けて設定圧縮力にて圧縮すること、及び、試験体を、試験用部材の平板状部材から離間する側の端面部を試験用液に接触させた状態にて試験用液に向けて設定圧縮力にて押圧することを行う負荷作用処理を行い、その後、試験用液の試験用部材に対する浸透具合を検査する検査処理を行う。【選択図】図１