Piping QC Notes CBT Aramco | PIPE FIT-UP AND TOLERANCES

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This article is about Piping Piping QC Notes of CBT Aramco related to topic of PIPE FIT-UP AND TOLERANCES Activity as per (SAES-L-350).

Maximum tolerance for axial dimensions, face to face, center to face and location of attachment shall be ±3 mm.
Flattening of bends measure as the difference between the largest & the smallest outside diameter of any cross section, shall not exceed 5% of the nominal diameter of the pipe.
Flattening of bends at weld ends shall not exceed 3% of the nominal pipe diameter.
Lateral transition of branches and connection from the center line of the run shall not exceed ±1.5 mm.
Rotation of flanges, measured as the offset between elevation of bolt holes on opposite sides of flange center line shall not exceed ± 2.4 mm.
The tilt of flange measured at the periphery across any diameter shall not exceed 1.6 mm from the square position.
Piping over 3-inch NPS and connected to machinery/equipment, flange alignment shall be within the following limits unless piping analysis per SAES-L-120 shows that loads and
moment are within the manufacturers limit for the machinery/equipment nozzles:
1. Vertical bolt hole offset ±2.4mm.
2. Horizontal bolt hole offset ±2.4mm.
3. Rotational offset ±2.4mm.
4. Flange face separation, gasket thickness ±1.6mm.
5. Combination of vertical, horizontal and rotational offset ±3.2mm.
A 6mm weep hole shall be drilled for all dummy support at 6 o’clock position for all horizontal dummy supports.

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