111、about 20000m ³ preparation before construction of lng cryogenic atmospheric pressure storage tank (2) - doer equipment
classification：industry publishtime：2019-12-05 14:37:45
about 20000m ³ preparation before construction of lng cryogenic atmospheric pressure storage tank (2)
about 20000m ³ welding material preparation for lng cryogenic and atmospheric pressure storage tank before construction:
for the management of welding materials, a special person shall be assigned to be responsible for the management on site, and the drying, distribution, recycling and repeated drying of welding materials shall be recorded. the drying of welding materials shall not exceed three times. limited distribution of stainless steel welding materials is implemented to eliminate misuse and mixed use.
the welding rod quality certificate or certificate shall be complete, and the certificate shall include the chemical composition and mechanical properties of the deposited metal.
the welding rod shall be heated in accordance with the relevant regulations of welding materials. before use, it must be dried and kept at constant temperature according to the table below.
the management, drying and distribution of welding materials on site shall be in the charge of special personnel, and records shall be made.
welding meteorological environment requirements
in any of the following welding environment, if effective measures are not taken, welding is not allowed.
rain or snow.
when welding by hand, the wind speed is more than 8m / s.
welding ambient temperature: lower than - 20 ℃.
the relative humidity of the atmosphere exceeds 90%.
if the welding rod stored in the insulating cylinder exceeds 4 hours, it must be handed over to the secondary warehouse for drying again. two kinds of welding materials cannot be stored in the same insulating cylinder.
the stainless steel materials shall be placed on the road wood and padded with rubber plate and asbestos plate. it is forbidden to contact with organic or carbon steel materials and friction on the ground. the material identification transplantation and appearance protection during transportation, loading and unloading, transportation, welding, hoisting, assembly and piping shall be done well.
before construction, use δ= 0.75mm galvanized steel plate is used to make tank installation inspection sample. the periphery of the sample plate shall be smooth and neat, and shall be reinforced with wood or flat steel to prevent deformation. the project name, curvature radius and size shall be indicated on the sample plate.
see the table below:
preparation of mould, bracket and expansion ring
prepare a set of mould for crown melon flap forming.
prepare two sets of mould for storage of crown melon petals.
four sets of molds are prepared for outer tank wall plate storage and four sets for inner tank wall plate storage.
prepare a set of tank lifting rings.
preparation of 16 tank lifting masts（ φ one hundred and fifty-nine × when the mast is used for stainless steel inner tank, stainless steel base plate or other effective isolation (to prevent carbonization) must be placed at the bottom, and the installation position of tank weld and expansion ring should be considered when positioning the mast.
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