Questions tagged [standards]

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12
votes
3answers
2k views

Schematic Diagrams for Mechanical Systems

Is there some sort of equivalent standardized schematical (topological) diagram -such as Piping and Instrumentation Diagram, Electrical Schematics, Process Flow Diagrams, etc.- for the realm of ...
6
votes
1answer
32k views

How deep are utilities typically buried?

What are the recommended or relevant standards for US city planning with regards to depth ranges for various utilities such as water, natural gas, and power, as well as for subway or rail, etc...? ...
6
votes
0answers
287 views

I-beam annotation for tube on drawing

I have been sent a clip of a drawing with the following annotations on it, but I've never seen them before and can't figure out what they mean. Is there a standard interpretation of these callouts? ...
5
votes
2answers
168 views

(de facto) Standards for freehand technical lettering?

What de facto standards or otherwise exist that prescribe a style for freehand technical lettering? With the ubiquity of CAD there is probably a diminished need for standardized handwriting. ...
4
votes
3answers
364 views

What organization specifies unit of measure conversions?

A recent work project involved a number of unit conversions between various systems of measurements. Due to the scale and critical nature of the project, we wanted to ascertain that our conversion ...
4
votes
1answer
980 views

Uncertainty Calculation of LVDT displacement transducers for length measurement

I have to calculate the uncertainty of measurement for an LVDT Linear displacement transducer used for measuring length. Uncertainty calculations are ruled by ISO 17025 but there are no (at least ...
4
votes
1answer
15k views

LO/LC, CSO/CSC Valve Definition

Does any one here know of an authoritative source (ASME, ISA, NFPA, OSHA, etc..) that gives a definition for the following in one of their standards or codes and the number for that standard or code: ...
3
votes
2answers
2k views

Normative Document for 'Grade 520' Steel

I am specifying a product made in Australia, which is made of "Grade 520 Steel." The manufacturer of the product lists a minimum yield stress of 520 N/mm² (75,400 psi) and a minimum ultimate stress of ...
3
votes
2answers
52 views

What ASTM standard would be appropriate for testing the breaking strength of nylon ropes

ASTM D4268-93 would appear to be the relevant testing standard, but this was withdrawn in 2002 and is no longer active. Is there a current standard?
3
votes
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 ...
3
votes
1answer
53 views

What thread could this camera motor be?

Firstly, I am sorry that the title of this question isn't helpful. I have bought these motors for a project: 5V 7mm 2 Phase 4 Wire Stepper Motor I assumed that the 1.7mm diameter threaded shaft ...
3
votes
2answers
313 views

What does the D stand for in the steel grade 16MND5

I would like to know what does the "D" means in steel grade 16MND5. According to the standard EN 10027: 16 means 0.16 % C MN 5 means 1.25 % Mn (5 must be divided by 4 to get the Mn mass fraction) ...
3
votes
1answer
2k views

EU EN standard 1822 vs US HEPA filters

There's a EU EN standard 1822 for air filters that has seen several iterations. The pre-2009 versions of EN 1822 (which seems to have come out in 1998) were pretty confusing as they allowed poorer ...
3
votes
0answers
611 views

GD&T for Multiple Surfaces as Single Feature

I'm looking to get some collective agreement on a question that I have come across a few times now. When referring to features that are technically independent, what is the general consensus on ...
2
votes
6answers
495 views

What is the accepted way to write units when specifying multiple dimensions?

When writing out dimensions in the form height x width x depth, what should you write for the units? For example, I can think of a few ways to approach this (assuming each dimension is measured in ...
2
votes
3answers
275 views

Are there standard terms that correspond to the anatomical axes, planes, and directions?

The field of human anatomy seems to have standardized on a number of useful terms to unambiguously describe the human body. For example the three planes and axes as well as various directions seem to ...
2
votes
1answer
536 views

What loads are office desks required to withstand?

This question about calculating loads on parts of a desk made me finally ask my first question on SE. What generally applicable standards are there for office furniture (desks, let's say), that ...
2
votes
2answers
59 views

Standard vs code

As an example ASCE 7 is a code that every civil / structural engineer must follow in USA. But if you look at ASCE 7 itself, search the word "standard", it calls itself a standard in many ...
2
votes
1answer
309 views

How can the shear capacity of a concrete slab be determined for effective depths under 200mm? [Eurocodes]

All, I'm designing a minor slab to Eurocode 2. It's purpose is more for show than any real structural purpose however I need to justify it's ability to resist it's own self weight and possibly the ...
2
votes
2answers
143 views

What standard and/or code covers building stormwater management?

As an energy engineer focused on energy efficiency in the built environment, I am familiar with the standards and codes covering energy use in buildings; specifically ASHRAE 90.1, the "Energy Standard ...
2
votes
1answer
1k views

Tolerance on bolt major diameters

What are the tolerance specs on the major diameter of imperial bolts? Specifically, a 1/4-20 imperial bolt has a major diameter of 0.25in, but what is the tolerance on that dimension. I (and ...
2
votes
1answer
378 views

Dead weight pressure tester for very low positive pressures

Does the dead weight tester technology provide capability for an accurate, low pressure calibration standard in the range of zero to 150 cm H2O, and if so is there a manufacturer that provides such an ...
2
votes
1answer
58 views

What standards exist regarding diagnostic systems in automotive engineering?

I'm designing a diagnostic system that simulates an environment and user input for a dummy vehicle. All possible critical situations are simulated in order to find out whether any errors are triggered,...
2
votes
1answer
4k views

Which vibration standard is the most common for transported packages?

There are several standards which all are valid when it comes to mechanical shock, bump and vibration, both for products in use and packaged and being transported. Here are a few: ISO 13355:2001 - ...
2
votes
1answer
46 views

What's the process for starting an ISO or IEEE standardization?

So, I just saw this question on the Statistics SE site, about how in artificial intelligence/machine learning some people use a particular set of terms in one way, and other people use the same set of ...
2
votes
0answers
99 views

Maximum allowable crack in Post Tension concrete

What is the maximum allowable crack size dimension in a post-tension concrete slab before it is considered a "structural" crack, in Arizona, USA? Is there a certain standard for this. I have tried ...
1
vote
3answers
2k views

What is the engineering standard for filenames with fractions and inches?

I need to save some engineering files that need the thicknesses in the filename. Windows hates "/" or "\", so I can't use a simple fraction. Symbols like this... ⅓, ⅔, ⅕, ⅖, ⅗, ⅘, ⅙, ⅚, ⅛, ⅜, ⅝, ⅞ .....
1
vote
2answers
167 views

What is the name of this section?

I am trying to identify the section designation so I can determine it's properties. I have looked under "C 150 x 100 x 40" but I can't find its properties or what it's correct designation. What is ...
1
vote
2answers
69 views

Filename standards and spacing

I've been working on implementing a new company standard for our file naming convention (super fun), and it has been mentioned to me that there is a "standard" that says that you shouldn't use spaces ...
1
vote
2answers
21 views

Elongation values for materials

According to EN standards, elongation for each material type has been defined, and it varies with different range of thicknesses for the same material. Why is it so? How is this value calculated?
1
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2answers
44 views

What is the 'application standard' referred to in EN 1993-1-7

I'm using the Eurocodes for some structural analysis and am looking for the limiting value of deflection of a plate. EN 1993-1-7, Section 8.2 states: For limiting values of out of plane deflection w ...
1
vote
1answer
30 views

Drawing documentation: Is possible to keep the original drawing valid when revised version is released?

is possible (by European standards) to have two (or more) valid drawings with same drawing number but different revision indexes? For example: DRW-001 = Some Bolt ...
1
vote
1answer
250 views

How do british standard pipe parallel (BSPP) (G) threads seal?

I realize that there must be some sort of o-ring, gasket, or washer, but from an engineering standpoint it is not clear how to know what fitting will seal to what without having the parts in front of ...
1
vote
1answer
737 views

How is sandpaper grit size (the FEPA number system) defined?

Sandpapers are labeled to show their coarseness according to different standards. The CAMI system is used in e.g. the USA, and the FEPA system in Europe. I am interested in the FEPA system. It labels ...
1
vote
1answer
2k views

Sizing plate washers for through-bolting to concrete

We are working on some equipment that is going to be attached to existing, 3,000 psi reinforced concrete floor slabs. In some locations, the best way to do this is to through-bolt and 'sandwich' the ...
1
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0answers
46 views

How to approach potential hazards that may result from user misuse, in a product design phase? [closed]

I am researching guidelines and considerations with respect to user safety when designing commercially sold products that contain user-operated machinery and moving parts (I.e. motors, pulleys, ...
1
vote
1answer
80 views

Is there anything in BS 8888 regarding the scale of a section view?

If a section view isn't sufficient enough to show all details required, can it be at a larger scale than its parent view? Is there anything in BS 8888 regarding recommended scales in section views? ...
1
vote
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
vote
0answers
14 views

How can I learn the standards(EN,ANSI,ISO) which is related to "roller hemming method in automotive industry"?

There is a method using in automotive industry which is called roller hemming. I have a project about this method but before beginning the project I need to learn the standards(EN,ANSI or ISO) which ...
1
vote
0answers
25 views

Standards for safety car seatbelts locking condition

Is there an (international) standard which determines the condition when a car seat belt locks? Which standard is it? Does the standard determines a speed in m/s of the belt, such that it locks if ...
1
vote
0answers
58 views

Origin of barricade tape color combinations (allegedly OSHA)

Various sources (e.g., Wikipedia and WorkSafely) claim that the seven color combinations commonly used for barricade tape (a.k.a. caution tape) and safety markings in North America (yellow and black ...
1
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0answers
75 views

Safety standards involved in building a zipline

I'm a ropeway engineer with a lifetime of experience. I would like to build a zipline in a public place (officials agreed to support me). Where can I get safety standards for constructing a zipline? ...
0
votes
1answer
53 views

Standard properties of air [closed]

Where can I find (cite-able sources) properties (such as specific heat at constant volume, thermal conductivity, viscosity etc...) of air at different temperatures (Range of 200K to 2000 K)?
0
votes
1answer
2k views

C15 Equivalent material in IS standard

I am need to match DIN C15 steel with an Indian steel but I don't know the equivalent grade in the Indian standard. For example, DIN C40 steel is known as EN8 under the IS standard; similarly, what is ...
0
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0answers
24 views

Reference design for a HSK machine spindle?

Is there a reference design somewhere on the web for a HSK milling machine spindle (mainly HSK type A, between 40-63)? I'm mainly looking at the fixating mechanism (drawbar et al) and its tolerances; ...
0
votes
2answers
42 views

How standardized are step pulleys/gear speeds on machines tools?

Edit/Note: This is NOT "the X/Y problem". The question I have asked here is exactly the question I need an answer to. I'm not asking how to selected the correct RPM for a given situation (...
0
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0answers
85 views

Is the use of direct-expansion split systems to heat or cool exit enclosures permitted under the US model building Codes?

Most multistory buildings have enclosed exit stairways somewhere within them to provide safe egress from their non-discharge floors. In a building that relies on hydronic heating/cooling, steam ...
0
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0answers
57 views

Is there a mushroom head bolt standard for sizes smaller than M4?

Is there a standard similar to DIN 603 / ISO 8678 (metric mushroom head square neck bolts) for sizes smaller than M4. DIN 603 only goes down to M5 (please correct me if I'm wrong). I did see similar ...
0
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0answers
68 views

classes and grades of steel and stainless steel

I'm trying to learn the standard nomenclature for the steel and stainless steel mainly used in the bolts, screws, nuts, and other fasteners in general. So far I have created this table: | Metric ...
0
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0answers
19 views

Why is CGNS not used in CSM?

The CGNS format appears to be only applied in CFD (computational fluid dynamics). Why is it not applied in CSM (computational solid mechanics)? Is there any technical reason? The hierarchical ...