Questions tagged [specifications]

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26 views

What is the difference between requirements and design specifications?

Working while employed at large companies, I was at times confused as to what was considered to be a requirement and how a specification differs from it. Upon reading more about it, I have discovered ...
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0answers
18 views

Is it allowed to have conflicting design requirements? [closed]

Is it ok to have conflicting design requirements?
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0answers
49 views

What is meant by “accuracy within factor of 2” in sensors?

I've spent quite some time googling the meaning of "factor of (number)" in sensor accuracy but could not find any document explaining the meaning of this expression used to describe sensor accuracy. ...
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0answers
10 views

Are there any specifications that address the environmental conditions items traveling though international post should be able to tolerate?

In terms of temperature extremes, air pressure, humidity, shock, ... In determining what ranges to design for in a device are there any standards or at least guidelines either by postal services or ...
1
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1answer
36 views

buying a mounted bearing determining radial vs axial load it can bear

Can anyone tell if these bearings load ratings are for a radial load or an axial load ? Bearing designed for an axial load is (sometimes?) called a "thrust bearing". Based on its mounting, I guess ...
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0answers
12 views

How to specify plumbing fixtures so models are not immediately out of date

Rock-solid guide specifications are the ultimate pipe-dream of consulting engineers because they minimize the amount of time that needs to be repeatedly spent on the minutiae of tiny details from ...
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1answer
55 views

Potentially fatal near miss: Due diligence in tool selection

I recently outfitted a crew to build scaffold in preparation for an upcoming turnaround at our plant. Among the tools requested were canvas buckets for manually hauling material and tools up and down ...
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0answers
17 views

External Static Pressure on Open Gallery Fan

I routinely work on building designs that incorporate rooftop upblast fans over large industrial spaces such as this one: When selecting these fans, as with every other fan, you need to determine the ...
3
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2answers
324 views

Specification of linear speed dampers

I'm looking at linear compression dampers and finding them most commonly specified only with a "Max Force" – e.g., 270 lbs. However, since the damping mechanism is provided by hydraulic or pneumatic ...
4
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2answers
135 views

Inert gas use during HVAC line installation

When brazing HVAC linesets, the correct method is to flow an inert gas through the line in order to prevent interior oxidation of the copper and brazing products. However, as a specifier, I can say ...
1
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1answer
40 views

Comparing 2 shock scenarios with different magnitudes and times

For example, How does one compare 100 g's for 6 milliseconds to 45 g's for 11 milliseconds. These are two different shock scenarios with different magnitudes and times, so how can I compare them? If I ...
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0answers
71 views

Moment Of Inertia Specifications AISC

Is there some regulatory body/inspection that verifies the AISC specified Moment(s) of Inertia for steel I-Beams? So for example, if a mill produces a W8x21 and says hey, it meets the specs, it's 8 ...
6
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2answers
3k views

Tube Steel - ASTM A1085 vs. A500

Recently, tube steel manufacturers in the US have begun using the new ASTM A1085 specification for forming tube steel (a.k.a. hollow structural section or HSS) shapes, as opposed to the existing A500 ...
3
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1answer
146 views

Industry standard for AC wall electrical box space

Are there any industry standards (Engineering Specifications) for the minimum / maximum space required for the electrical box that holds a regular AC wall plug? The problem I am trying to solve is ...