| 摘要 |
PROBLEM TO BE SOLVED: To improve a seal life of uneven segment of an inner face of side wall of a gasholder mainframe and attain equilibrium of seal life between a flat segment and an uneven segment so as to decrease the number of replacement of sealing material. SOLUTION: The gasholder that consists of the gasholder mainframe 2 equipped with the flat segment 8 and the uneven segment 9 along the periphery direction of the inner face of sidewall 4a, a piston swinging along the inner face of sidewall 4a, and a seal means to seal the space between the piston and the inner face of sidewall 4a, is provided with a same diameter of seal roller 10 swinging in conjunction with the piston 3 seesaw movement at the condition that the flat segment 8 is depressed by the seal means, and a different diameter of seal roller 11 having the outer circumferential corresponding the shape of the uneven segment 9 swinging in conjunction with the piston 3 seesaw movement at the condition that the uneven segment 9 is depressed by the seal means.
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