The project document wins
Codes set frameworks, but drawings, specifications, ITPs and qualified procedures often set the actual project tolerance.
Free construction field utility
Tolerance and Fit-Up Reference
Use the hold-point prompts to check what must be measured and which approved project document supplies the acceptance value.
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Record the measured value
“Accepted” is not a measurement. Keep the actual reading, location, instrument and drawing or procedure revision used.
Structural steel erection & fit-up
| Member position & level | Survey against setting-out points and approved drawings. | Acceptance source: Approved drawings, survey plan, project erection tolerance schedule |
|---|---|---|
| Column plumbness | Measure in both principal directions; record elevation and survey method. | Acceptance source: Project specification and the adopted structural steel code |
| Base plate bearing | Check line, level, grout space, packers and full bearing condition. | Acceptance source: Approved detail, method statement and grout specification |
| Bolt holes & connections | Do not flame-cut, enlarge or force alignment without an approved disposition. | Acceptance source: Connection detail, bolting procedure and NCR / concession process |
| Weld joint preparation | Confirm bevel, root opening, alignment, cleanliness and tack condition before welding. | Acceptance source: Approved WPS and applicable welding code |
Piping fit-up
| Root opening & bevel | Measure before tacking; confirm surface preparation and joint type. | Acceptance source: Approved WPS and weld map |
|---|---|---|
| Internal misalignment | Check hi-lo at several positions around the bore before welding. | Acceptance source: Approved WPS, project piping specification and governing code |
| Flange alignment | Check parallelism, bolt-hole orientation and gap without using bolt force to pull the joint in. | Acceptance source: Piping specification, vendor requirement and approved isometric |
| Slope & support | Survey the installed run before final tightening and before insulation. | Acceptance source: Approved isometric, line list and support drawings |
| Branch orientation | Confirm clock position, reinforcement, projection and clearance. | Acceptance source: Approved isometric, piping class and branch detail |
How to use it
- Choose the structural or piping inspection point.
- Read the check together with its acceptance source.
- Record the actual value, location, instrument, and approved document revision.
Field-use boundary
This reference deliberately does not invent one universal millimetre limit. Acceptance varies by code edition, joint, material, service, procedure, and contract. Confirm the current approved revision before accepting or rejecting work.
Keep the record
Keep the input, responsible-person review, project document revision, and issued output together in the controlled project file.
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