Ma ke kahua o ka aila wili a me ka aila luawai, kiʻekiʻe-frequency uila kū'ē kū'ē welded casing (i kapaia e like me ERW casing) hoohalike me ka seamless casing mea kiʻekiʻe dimensional pololei, weld toughness, anti-extrusion o kiʻekiʻe-hana, a me ka haʻahaʻa kumu kūʻai pono pono. ua hoʻohana nui ʻia i nā hui haole ...
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