Pipe Laser Setup Checker
A pipe-laser setup and independent-check record with an optional worksheet: design invert = start + signed grade × chainage, beam RL = invert + declared offset.
Project and review scope
A setup and independent-check record for one pipe-laser reach, plus an optional predicted invert and beam worksheet. It does not replace the instrument manual, set the laser or certify the pipe; tolerances are yours.
Predicted beam and invert worksheet (optional)
Invert(x) = start invert + signed grade × x; beam RL = invert + declared beam offset. Negative grade = falls as chainage increases. Your laser manual governs the setup itself.
- Note: A target height is not an invert RL: invert = beam RL − beam offset, and the offset must be declared.
- Problem: Grade direction not declared — state whether the pipe falls or rises as chainage increases.
Review status: Not reviewed
Review progress 0 of 17 applicable rows verified (0%)
Outstanding critical findings
- Grade direction not declared — state whether the pipe falls or rises as chainage increases.
- Setup invert / reference RL checked — Not started
- Benchmark source independently checked — Not started
- Increasing chainage and signed grade declared — Not started
- Laser beam offset distinguished from pipe invert — Not started
Review rows
Design data
0/1 verifiedDesign invert levels and grade to hand
Reference level
0/2 verifiedSetup invert / reference RL checked
Critical
Benchmark source independently checked
Critical
Alignment and direction
0/3 verifiedChainage and direction confirmed
Line set to design alignment
Increasing chainage and signed grade declared
Critical
Laser setup and grade
0/3 verifiedLaser level and stable
Grade dialled to design
Mounting stability recorded (base, trench box, manhole)
Target and beam offset
0/3 verifiedTarget height matches laser height
The target reads the beam, not the invert — record the beam offset above invert separately.
Laser beam offset distinguished from pipe invert
Critical
Target orientation and centring checked
Independent checks
0/3 verifiedIndependent check of grade over a known length
First pipe(s) checked against invert
Independent observed-minus-design residual recorded
Disturbance and recalibration
0/2 verifiedRe-check after any knock or move
Instrument manual and calibration reference recorded
Add your own row
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Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Record the pipe reach, laser model and manual reference, benchmark and its source, design inverts and grade, and where chainage starts and which way it increases.
- Work through design data, reference level, alignment, setup and grade, target and beam offset, independent checks and recalibration rows.
- Optionally enter the start invert, signed grade, its direction, a chainage and the declared beam offset to predict the invert and beam RL, then add independent check observations and your tolerance.
How it works
Design invert at chainage x: IL(x) = IL₀ + g × x, with g signed along increasing chainage (negative = falls). Beam RL = IL(x) + declared beam offset. Residual = observed invert − design invert, in mm.
Grade parsing and the sign convention are shared with the Basic Drainage Grade Calculator: percent ÷ 100, or a signed 1:N as 1 ÷ N. You must also declare whether the pipe falls or rises — a sign that contradicts the declaration, or no declaration, blocks “Ready for reviewer”.
A target height is not an invert RL. Residuals are judged only against your tolerance (inclusive); the instrument manual still governs the setup.
Worked example
A falling stormwater reach. Start invert 100.000 m with a grade of −0.5 % (−0.005) over 20 m gives a design invert of 99.900 m. With a 0.200 m beam offset the beam RL is 100.100 m; with 0.150 m it is 100.050 m. An independent shot of 99.894 m at 20 m is −6.0 mm — within a ±6 mm tolerance, outside ±5.9 mm.
Frequently asked questions
What has actually been checked?
Only what a person marked Verified, with the evidence they recorded. The worksheet predicts levels from your numbers; it does not read the laser or confirm the pipe was laid to grade.
Can I use my own project requirements?
Yes. Enter your design grade, beam offset and invert tolerance from the drawings and your project specification. Add your own rows (they get stable IDs), and mark rows that do not apply as Not applicable with a reason.
Does a complete checklist prove the work complies?
No. “Ready for reviewer” is your declaration that every applicable row is verified. The instrument manual, the design and your project's acceptance testing decide that.
Why must I declare whether the grade falls or rises?
Because sign conventions differ between drawings, software and lasers. Declaring the direction catches a −0.5 % entered as +0.5 % before the first pipe goes in.
Is this official course material?
No. It is free study support mapped to surveying course levels — not official North Metropolitan TAFE content or advice. Always follow your lecturer and the official assessment brief, and check your own working.
Related tools
- Basic Drainage Grade Calculator
- Pipe Flow Calculator
- Manning Pipe Flow Calculator
- Rise and Fall Levelling Worksheet
- Batter Peg Reduced Level Calculator
- Stormwater Invert Table Builder
Explore more in Surveying, Coordinates, GIS & CAD.
Cite this tool
Zerdly. (2026). Pipe Laser Setup Checker. Retrieved from https://www.zerdly.com/tools/pipe-laser-setup-checker/
Tip: Enter any known values to calculate the remaining results.
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