https://yse.yabesh.ir/std/handle/yse/153 2026-06-01T06:15:50Z https://yse.yabesh.ir/std/handle/yse/231024 PFI ES-7; Minimum Length and Spacing for Welded Nozzles PFI - Pipe Fabrication Institute This Standard covers the minimum recommended length, distance from open end on run, and spacing dimensions of adjacent welded nozzles. 2004-01-01T00:00:00Z https://yse.yabesh.ir/std/handle/yse/200564 PFI ES-1; INTERNAL MACHINING AND SOLID MACHINED BACKING RINGS FOR CIRCUMFERENTIAL BUTT WELDS PFI - Pipe Fabrication Institute This Standard covers the dimensioning of solid machined backing rings and the internal machining of seamless and welded piping components for use with these rings. <br>Piping components must be internally machined to a close tolerance to accept solid machined backing rings. For this reason, solid machined backing rings are not recommended for use with piping components with wall thickness less than 0.562" (14mm). 2010-01-01T00:00:00Z https://yse.yabesh.ir/std/handle/yse/191297 PFI ES-22; Recommended Practice for Color Coding of Piping Materials PFI - Pipe Fabrication Institute The intent of this standard is to provide a system for easy identification of piping materials by general material classifications. 2006-01-01T00:00:00Z https://yse.yabesh.ir/std/handle/yse/156774 PFI ES-3; FABRICATING TOLERANCES PFI - Pipe Fabrication Institute This standard covers general pipe shop fabricating tolerances for prefabricated piping assemblies. 2004-01-01T00:00:00Z