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BPC Lemongrass Project in Malaysia —Piping construction method statement
Unqualified Work flow of pipe installation (sketch3) Preparation Manpower and equipment Make construction plan Scaffolding erection material and acceptance Equipment and structure Bracket Fitting-up and installation on site and on-line instrument component installation Pipe internal cleaning before lifting Pipe Preheating, heat treatment or others Welding on site Adjusted pipe fabrication and installation Support installation Pressure method confirm Inspection according to work flow chart PT、RT etc Pipeline inspection Inspection according to work flow chart Inspection according to support Pipeline modify installation drawing Final inspection Test Pack Document Check Temporary pipeline installation Pipe pressure test and gold joint Confirmation of flushing method Equipment preparation Pipeline blasting and flushing Temporary pipe installation pipeline Pipeline replacement Inspection of pipe replacement Removal of pipe instrument on the Painting Confirmation of method Air leakage test Confirmation of method Electric tracing heat Confirmation of method Confirmation of method Pipe insulation Handover Page 13 of 55
BPC Lemongrass Project in Malaysia —Piping construction method statement 5.2.4.管道安装的允许偏差 Allowable Deviation of pipe installation
架空及地沟平面坐标：室内允许偏差15mm，室外允许偏差25mm。 Coordinate of overhead layer and trench: indoor shall be 15mm, outdoor shall be 25mm.
架空及地沟标高：室内允许偏差±15mm，室外允许偏差±20mm。Elevation of overhead layer and trench: indoor shall be ±15mm, outdoor shall be ±20mm.
水平管道平直度：DN≤100，允许偏差为2L‰，最大50mm。DN＞100，允许偏差为3L‰，最大80mm。Straightness of horizontal pipeline: if DN≤100, allowable deviation shall be 2L‰, maximum deviation shall be 50mm. if DN≤100, allowable deviation shall be 3L‰, maximum deviation shall be 50mm.
立管铅垂度：允许偏差为5L‰，最大30mm。The verticality of riser pipeline: allowable deviation shall be 5L‰, maximum allowable deviation shall be 30mm.
成排管道的间距：允许偏差15mm。The interval of pipe in a row: the allowable deviation shall be 15mm.
交叉管或绝热层间距：允许偏差20mm。The interval of cross pipeline or thermal insulation layer: the allowable deviation shall be 20mm.
5.2.5.管道各类焊缝间距要求 interval space requirement of various weld joint 管道各类焊缝间距要求详见（图3）及表二
Please refer to (sketch 3) and form 2 for interval space requirement of various weld joint
B B A B t(mm) D(mm) B B C D 管道焊缝间距要求示意图（图3）
Sketch for interval space requirement of pipe weld joint (sketch 3)
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BPC Lemongrass Project in Malaysia —Piping construction method statement
表二(form2)
焊缝最小间距（选最大者）Minimum
焊缝类型Description of Weld Type Distance Between Weld Toes (whichever
is greater) A B C D
120°or(Dt)or 5t（1） 120°or(Dt)or 5t100mm or 2t（3） 50mm or 2t （2）
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BPC Lemongrass Project in Malaysia —Piping construction method statement
Dimensional tolerances for fabricated piping
FOR TOLERANCES ON BEND PROFILES SEE PIPE
采用气体乌弧焊和气体金属弧焊预制的焊口错边量不得超过2.4mm (0.8mm) MISALIGNMENT ACROSS ANY
DIAMETER
AT SHALL
WELD NOT (0.8mm)
PREPARATIONS EXCEED
偏离中心线不得超过+/-3.2mm +/-3.2mm MAX OFF CENTRELINE
2.4mm
FORGTAW/GMAW WELDS
法兰的旋转不得超过1.6mm ROTATION OF FLANGES FROM THE
INDICATED
POSITION
MEASURED AS SHOWN 1.6mm MAXIMUM
法兰面的错边量不得超过0.25mm /100mm直径。MISALIGNMENT ACROSS ANY DIAMETER ATFLANGE FACES SHALL NOT EXCEED 0.25mm PER 100mm DIAMETER，
5.2.6管线铺设 Pipeline laying
5.2.6.1管廊管道铺设 Rack pipe laying A.管廊穿管 Pipe laying
对于管廊及管吊架上管线，其为分层排列，给管道铺设工作造成极大麻烦，因而必须合理地安排施工方法。管道敷设时，从管廊端头穿入管廊各层，并计算好各层用料。穿管时，通过吊车直接将管道放置于窜管器上。For the pipe rack and pipeline on the bracket, which shall be arranged reasonably by layers, to prevent pipe laying from being in trouble. During Pipe laying,
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