Questions tagged [standards]
The standards tag has no usage guidance.
69
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Can I omit the scale information in the technical drawing of a mildly complex mechanical part if I provide all of the necessary dimensions clearly?
and thanks in advance for taking the time to help me.
TL;DR: I work for a company where I need to make technical drawings—mostly using SolidWorks—of some mechanical components. Do I have to include ...
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Should codes on instruments represent the quantity they measure or the quantity they regulate (P&ID)
Let say you want to make a P&ID diagram of a process in which a level sensor transmits its data to a flow controller. The quantity measured is a tank's level, but the quantity controlled is the ...
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How to transfer compressed gas GH2 from one tank to another at the same pressure?
The problem is to transfer all the compressed hydrogen from one tank on a ship at 400 bars to fill another tank on earth (also to fill it at 400 bars). What are the common technologies and equipment (...
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What (standardized) naming is enough to completely specify a type of steel?
What (standardized) naming is enough to completely specify a type of steel? That is, the composition and properties.
Take for example 1.0037 S235JR. Are these two numbers linked/equivalent, do you ...
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What is the relevant UK standard for sizing of steel against lateral movement in a box frame?
In a UK domestic terrace property, when a full width extension is constructed, the removed external wall is typically replaced by a moment resisting box frame, not only to support the wall above, but ...
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Are bolt and nut dimensions standardized?
Given the nominal size of a bolt/nut, e.g M10, can one construct all other dimensions from it? Do these dimensions differ between manufacturers or are these standardized. If so, where can I find ...
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Convention for describing infrastructure: From south & west to north & east
When textually describing the extents of infrastructure, such as the roads with red markup in the map below:
Is there a civil engineering convention for the order/direction in which we would describe ...
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Is seal water/lubriaction oil for equiptment shown in P&IDs? If so, how to show it? (ISO)
Given the sheer amount of pumps, adding seal water lines would complicate things a lot. One alternative would be to draw the lines coming the pump that pumps the seal water, and just symbolize them &...
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How to draw a pipe being moved between tanks? (ISO standard P&ID)
Where I work, we have a set-up that functionally, works as represented below:
I represented it as such, due to a lack of know-how in regards to the actual, ISO-standardized way of representing this ...
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ISO standards for drawing reserve equiptment in P&IDs
Let's say you have two pumps, one always running and the other in reserve. Maybe they're switched regularly, or maybe the other is only used when the first is broken/down for maintenance.
In a P&...
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Where to find a complete overview for ISO P&ID standards?
I have tons of questions in regard to what is, and isn't, in accordance with ISO standards when drawing P&IDs. So, I'm looking for a resource which gives a complete overview of the standards.
...
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Why aren't fasteners open standards?
I just wanted to find information for an M2 flat head hex socket machine screw which, I believe, is defined by ISO 10642, but unfortunately that is locked behind a paywall of a couple hundred dollars. ...
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676
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What is DIN 338 for drill bits?
I'm looking around for drill bits, and I keep reading "DIN 338" everywhere.
What is DIN 338? And what does it mean when a retailer or manufacturer writes "DIN 338" on the product ...
- 119
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136
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how to interpret plots in ISO 10816-8?
In ISO 10816-8 for reciprocating compressors, there are some plots that show the allowable RMS vs. frequency for every part of a compressor.
However, in the text of the standard, it is mentioned that ...
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392
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Transformer secondary conductor protection: how do NEC 240.21(C) and NEC 240.4(B) make sense together?
NEC 240.21 says all ungrounded circuit conductors require overcurrent protection, with a list of exceptions:
One of those exceptions is 240.21(C):
240.4(B) says that if you're under 800 amps, you ...
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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; ...
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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, ...
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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 ...
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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 (...
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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 ...
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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?
...
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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 ...
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258
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Converting flow rate from normal/standard liters per minute to cubic meters per second
I'm really confused about these three units commonly used for measuring airflow:
cubic meters per second (m3/s)
normal liters per minute (NLPM)
standard liters per minute (SLPM)
I would appreciate ...
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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?
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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 ...
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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 ...
- 275
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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?
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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 ...
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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 ...
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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 ...
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Which K-factor (metal bending) is defined first, ANSI or DIN?
Description
We had been through several issues with K-factor handling of two teams due to the same name assigned by different standards.
ANSI and DIN has defined the same term for the same purpose. ...
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What standards apply when specifying coating/painting in a mechanical part drawing?
I have produced a part drawing which calls up a machined mark on a flat surface, and the supplier has manufactured the part with this surface painted. I haven't added a note to the drawing that says ...
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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)
...
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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 ...
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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 ...
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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,...
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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
.....
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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 ...
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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 ...
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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 ...
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1k
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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 ...
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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 ...
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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 ...
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What is the Thickness of JIS Standard Pipe
I work in engineering company that doing pipe installation. Just now our company got inquiry from Japanese company. They ask me to manufacture a pipe for exhaust ducting. The thing is they use ...
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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 ...
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