Shaft-Alignment JSA: Soft Foot, Repeatable Measurements and Final Piping State

An alignment reading belongs to a particular temperature, bolt condition and piping state. Preserve those conditions with the result and remeasure when they change.

This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site authorization are necessary before use.

Stop conditions first

Hold guard removal for unverified startup/backflow isolation, standstill or manual rotation method. Stop adjustment for unstable feet, nonrepeatable readings, forced piping, base distortion or unknown targets.

1. US legal and technical basis

General-industry maintenance under applicable OSHA 1910.147 energy control and 1910.212 machine guarding. The equipment/coupling instructions determine alignment targets; laser-tool suggestions do not replace those targets.

Determine whether Federal OSHA or an applicable State Plan governs the employer and work. Standards incorporated into a regulation must be read in their legally applicable edition. Other NFPA/ANSI guidance and manufacturer instructions have distinct roles; they are not automatically federal law.

2. Scope and required inputs

Included

Align an isolated motor and driven machine using laser or dial instruments, inspect base/soft foot, adjust with suitable shims and supports, remeasure the final state and hand over for separate startup.

Separate assessment

Powered rotation with guards open, live hand adjustment, invented thermal-growth targets and unassessed piping modification or operating vibration acceptance are excluded.

Selected public official provisions were checked on October 13, 2026. This is not a complete legal audit. No actual equipment manual, site measurements, engineering calculations, product certification or professional technical approval was supplied. Full paid NFPA/ANSI standards and state/local amendments were not reviewed. Check actual equipment, jurisdiction and project requirements before use.

Select task-appropriate eye, hand, foot, skin and hearing protection from the exposure assessment. Where respiratory protection is necessary, use the applicable respiratory-protection program; PPE does not replace isolation, guarding, support or ventilation.

3. Eight-stage JSA

Actual risk assessments, measurements, checks, approvals and signatures have not been performed. Keep unverified fields blank and link the actual site records. P/S/R/A mean likelihood, severity, site-method risk and site-defined acceptance/authorization; a score cannot waive a required control.

4. Failure mechanisms and hypothetical case

The retained illustration is an AI-generated educational image from the Korean source. It is not an actual incident photograph, approved drawing, equipment certification or proof that the depicted arrangement is safe.

Soft foot is uneven or unsuitable foot-to-base contact that can distort or move the machine when bolts are tightened. Dirt, damaged shims and angled contact need cause correction rather than blind addition of shim thickness.

A favorable display is only useful when sensor mounting, dimensions, rotation positions, bolt state and temperature are correct and repeatable. Investigate changing readings before moving the machine again.

Piping connection and final bolt tightening can change shaft position. Do not pull the machine into alignment with coupling or pipe bolts; resolve the cause and check the completed installation state.

Cold targets can differ from operating targets because of thermal growth. Alignment acceptance, instrument removal, guard restoration and startup authorization remain separate checks.

Hypothetical decision example

Hypothetical example: initial cold readings are saved, then piping is forced into place and foot bolts are retightened. The initial result is proposed as final. Handover is held while pipe strain, foot contact and alignment are reassessed in the final condition.

The example is fictional; no incident, measurement, inspection or approval is asserted.

Task flow: Confirm targets and scope → Isolate and verify stop → Check base and instruments → Measure initial condition → Shim and move safely → Remeasure final state → Hold unstable results → Restore and transfer

5. Hold and proceed decisions

Similar observation, different conclusion

6. Roles and supervision

These are responsibility examples, not invented statutory credentials. Verify actual competence, training and authority for the assigned work.

Supervision and handover controls

7. Hold points and record quality

Hold points are internal evidence gates. They do not establish that a statutory permit exists or has been approved. Recheck affected gates after changes, faults and shift handover.

Record comparison - hypothetical templates

The 16 boxes below identify record elements, not completed checks or approvals. They are static symbols. Link equipment/location, date, actual findings and the separate record reference; preserve unresolved items.

8. Pre-work checks and emergency response

Stop work

Hold guard removal for unverified startup/backflow isolation, standstill or manual rotation method. Stop adjustment for unstable feet, nonrepeatable readings, forced piping, base distortion or unknown targets.

Emergency response

Stop manual movement and keep hands clear of couplings, machine feet and shifting supports. Maintain isolation and stabilize the machine with the approved method before rescue or recovery. Do not jog the motor or loosen load-bearing supports to release a trapped part. Call 911 for serious crushing or entanglement injury and tell responders the equipment, isolation and support state.

9. Official sources and review limits

Official public-source check: October 13, 2026. The review concerns the selected passages described below, not endorsement of this article.

Selected public official provisions were checked on October 13, 2026. This is not a complete legal audit. No actual equipment manual, site measurements, engineering calculations, product certification or professional technical approval was supplied. Full paid NFPA/ANSI standards and state/local amendments were not reviewed. Check actual equipment, jurisdiction and project requirements before use.

This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site authorization are necessary before use.

10. PDF use and frequently asked questions

PDF A summarizes core controls; B emphasizes technical failures; C covers supervision, records and handover. Each uses six stages from or aligned with the eight-stage body. All actual risk, measurement, check and signature fields are blank. Use a separate linked record where more space is needed.

Does a green laser display finish the job?

No. Verify inputs, repeatability, final connection state and the actual equipment target, then restore guarding.

Is more shim always the soft-foot correction?

No. Identify contamination, damaged contact, distortion or angled foot conditions and remeasure after correction.

Should all cold targets be zero?

Use the approved equipment thermal-growth basis and operating requirements.

Can the motor be jogged for measurement?

Powered rotation with exposed couplings is outside this scope. Use the instructed manual method under verified energy control.

Has a professional approved this JSA?

This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site authorization are necessary before use.

11. Authorship and revision history

This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site authorization are necessary before use.

Source topic: https://smartjsabridge.com/ko/case-study/jsa-shaft-alignment

Content group: jsa-shaft-alignment