Nando 3.0
A small example package
Requires Python: >=3.6
Keywords: test,tests,test1

# Lets see if this works

This is a simple example package. You can use
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# Subtitle?
A  **proof test**  is a form of [stress test](https://en.wikipedia.org/wiki/Stress_testing) to demonstrate the fitness of a load-bearing structure. An individual proof test may apply only to the unit tested, or to its design in general for mass-produced items. Such a structure is often subjected to loads above that expected in actual use, demonstrating [safety](https://en.wikipedia.org/wiki/Factor_of_safety) and [design margin](https://en.wikipedia.org/wiki/Factor_of_safety). Proof testing is nominally a [nondestructive](https://en.wikipedia.org/wiki/Nondestructive_evaluation) test,[[1]](https://en.wikipedia.org/wiki/Proof_test#cite_note-tu-1) particularly if both design margins and test levels are well-chosen. However, unit failures are by definition considered to have been destroyed for their originally-intended use and load levels.

Proof tests may be performed before a new design or unit is allowed to enter service, or perform additional uses,[[2]](https://en.wikipedia.org/wiki/Proof_test#cite_note-vdisplay-2) or to verify that an existing unit is still functional as intended.[[3]](https://en.wikipedia.org/wiki/Proof_test#cite_note-rockwell-3)

**Contents**

- [1Applications of proof testing](https://en.wikipedia.org/wiki/Proof_test#Applications_of_proof_testing)
  - [1.1Industrial tooling](https://en.wikipedia.org/wiki/Proof_test#Industrial_tooling)
  - [1.2Turbomachinery](https://en.wikipedia.org/wiki/Proof_test#Turbomachinery)
  - [1.3Swords](https://en.wikipedia.org/wiki/Proof_test#Swords)
  - [1.4Pressure vessels](https://en.wikipedia.org/wiki/Proof_test#Pressure_vessels)
  - [1.5Firearms](https://en.wikipedia.org/wiki/Proof_test#Firearms)
    - [1.5.1Testing methodology](https://en.wikipedia.org/wiki/Proof_test#Testing_methodology)
    - [1.5.2Proof marks](https://en.wikipedia.org/wiki/Proof_test#Proof_marks)
    - [1.5.3Small arms proof testing](https://en.wikipedia.org/wiki/Proof_test#Small_arms_proof_testing)
    - [1.5.4Proof testing in C.I.P. regulated countries](https://en.wikipedia.org/wiki/Proof_test#Proof_testing_in_C.I.P._regulated_countries)
    - [1.5.5Proof test differences](https://en.wikipedia.org/wiki/Proof_test#Proof_test_differences)
    - [1.5.6Large caliber proof testing](https://en.wikipedia.org/wiki/Proof_test#Large_caliber_proof_testing)
    - [1.5.7Instrumentation used in proofing](https://en.wikipedia.org/wiki/Proof_test#Instrumentation_used_in_proofing)
    - [1.5.8Reproof](https://en.wikipedia.org/wiki/Proof_test#Reproof)
  - [1.6Vehicles](https://en.wikipedia.org/wiki/Proof_test#Vehicles)
  - [1.7Industrial leak testing](https://en.wikipedia.org/wiki/Proof_test#Industrial_leak_testing)
- [2See also](https://en.wikipedia.org/wiki/Proof_test#See_also)
- [3References](https://en.wikipedia.org/wiki/Proof_test#References)
- [4Bibliography](https://en.wikipedia.org/wiki/Proof_test#Bibliography)
- [5External links](https://en.wikipedia.org/wiki/Proof_test#External_links)

Applications of proof testing[[edit](https://en.wikipedia.org/w/index.php?title=Proof_test&amp;action=edit&amp;section=1)]

**Industrial tooling** [[edit](https://en.wikipedia.org/w/index.php?title=Proof_test&amp;action=edit&amp;section=2)]

Cranes and derricks are proof tested when called on for potentially dangerous load levels or high-valued cargoes.[[4]](https://en.wikipedia.org/wiki/Proof_test#cite_note-ocrane-4)[[5]](https://en.wikipedia.org/wiki/Proof_test#cite_note-oderrick-5) Similarly, items which are smaller and more common (rope and cable, slings, shackles and eyes) are nevertheless in the load path and a failure risk if not tested.[[6]](https://en.wikipedia.org/wiki/Proof_test#cite_note-west-6) Testing generally involves lifting weight or drawing tension equal to or greater than design levels.

**Turbomachinery** [[edit](https://en.wikipedia.org/w/index.php?title=Proof_test&amp;action=edit&amp;section=3)]

An overspeed proof test involves physically running the machine at high speed up to the test speed. This may be done during manufacture as an initial proof test. Physical overspeed tests may be periodically undertaken on some machines to verify operation of the overspeed protection systems.

Operation at speeds above the normal operating speed can greatly increase stress levels in rotating parts. Failing flywheels, rotors, etc. may present a shrapnel risk in case of a failure.[[7]](https://en.wikipedia.org/wiki/Proof_test#cite_note-td-7)

**Swords** [[edit](https://en.wikipedia.org/w/index.php?title=Proof_test&amp;action=edit&amp;section=4)]

Historically, [swords](https://en.wikipedia.org/wiki/Sword) would be proof tested by impact before issuance- the &quot;British test&quot;.[[8]](https://en.wikipedia.org/wiki/Proof_test#cite_note-brit-8)

**Pressure vessels** [[edit](https://en.wikipedia.org/w/index.php?title=Proof_test&amp;action=edit&amp;section=5)]

Vessels which may be a failure risk, such as utility-scale water towers, chemical-handling equipment,[[9]](https://en.wikipedia.org/wiki/Proof_test#cite_note-sewerlining-9) or very-high-pressure storage tanks, may be proof tested. Rocket [stage](https://en.wikipedia.org/wiki/Multistage_rocket) tankage, being high-valued and often the [vehicle&#39;s primary structure](https://en.wikipedia.org/wiki/Monocoque), are proof-tested when redesigned,[[10]](https://en.wikipedia.org/wiki/Proof_test#cite_note-usfe-10) and may be tested at the unit level.[[11]](https://en.wikipedia.org/wiki/Proof_test#cite_note-ea-11) Testing involves exposure to higher gauge pressures than design levels, or in some cases, pulling harder vacuum.