Questions tagged [safety]

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How much weight would be needed to hold down 3 solar panel (40lbs each) with metal/wood frame mount, using no in ground anchors [closed]

I'm trying to figure out how to mount 3 solar panels so the long way of a panel (5feet) is at base, and going up, each is roughly 3 feet times 3 panels. So solar array is 5' x 9'. It's going to be ...
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Is it somehow dangerous to spray compressed air into a CRT TV? [duplicate]

I am planning to unscrew the plastic chassis of my big old CRT TV, after having it unplugged for 24 hours, and then spray compressed air all over the internals to remove all the heavy layers of dust ...
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2 answers
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Why am I getting such conflicting safety advice regarding opening up and dedusting/servicing my CRT TV?

I have asked questions on Stack Exchange. I have watched many videos on YouTube. I have asked professional TV repairmen. I get wildly different advice on the safety of opening my 1989 28" CRT TV. ...
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-1 votes
1 answer
35 views

Could large electromagnets be used to stop active shooters? [closed]

I was thinking that a powerful set of electromagnets in high risk doorways could be used to stop active shooters. By placing them in doorways. The magnet size could be mitigated. Also, they could be ...
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Is it dangerous for a child (or anyone) to bang away with a hammer and unscrew an old clothes washing machine?

In the mid-1990s at the latest, possibly something like 1992-1993, our family's clothes washing machine, presumably from sometime in the 1980s, broke down. My dad brought it out on the driveway ...
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Fire safety assessment, event tree

For the following mathematical risk assessment assignment I have a question. Assume that you need to make a decision on taking safety measures with respect to a fire in a hotel due to an ashtray ...
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3 answers
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How dangerous is it for me and the TV to open up my CRT TV to dedust it with compressed air?

I've heard many times warnings about opening up CRT TVs on your own, because they contain scary old capacitors full of scary electricity, ready to zap your heart from you just looking at them. But I ...
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0 votes
1 answer
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How to protect users from shock hazards from electric vehicle high voltage system?

Good day to all! I am in the design phase of an electric vehicle. I have realised that at one point, we will need to implement protective measures to safeguard the users from shock hazards of the high ...
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0 votes
1 answer
53 views

Historic tragedy: is this a drive belt accident?

My cousin turned up a chilling report of the death of one of our relatives in the Cyfarthfa steelworks in 1905. I'm trying to form a picture of just what happened. Sorry, I only have an image of this ...
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Understanding application of IEC 61508 onto an electronic device

I am not quite sure if this is the accurate place to answer the question, but I'll give it a try. I am currently in charge to evaluate how an electronic device can be evaluated and developed for ...
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60 views

Why were handcuffs ever made with a chain between them?

I've noticed that modern handcuffs are always attached directly to each other, without any "chain" of any length in between. I guess I can understand why that make them safer and more robust....
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1 answer
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Why do I not get zapped when I hold my fingers on each end of an AA battery, like 3R12 ones?

When I was a kid, I got an 3R12 (or are they called R12?) battery. I don't know why, but I tried to put my tongue so that it touched both of the little metal things, which made it tingle. It felt ...
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17 votes
4 answers
5k views

Why are train brakes so complicated?

The concept is simple enough: no pressure in the train line has the brakes locked, full pressure is loose, and partial pressure drags accordingly. So if pressure is lost for any reason, the train ...
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3 votes
2 answers
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Why do pneumatic valves need both a Safety Relay and an Air Dump to be safe?

If air dumps safely release pneumatic pressure from an industrial machine when an E-Stop is pressed, why is it also standard practice to cut electrical control power from the valves with a safety ...
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1 answer
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Is there any way to quantify the rate at which pressure is relieved in a reactor?

If a pressure relief valve is open, is it somehow possible to quantify the rate at which the pressure in the reactor will decrease?
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2 answers
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What is the purpose of these "safety" ledges on this Asian skyscraper?

While watching a video of a crazy person jumping around on buildings in some Asian country in a death-defying manner, I noticed these odd "safety" ledges outside, with nothing preventing you ...
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0 votes
1 answer
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Lightning strike and metal structures in garden

I am worried about metal posts (support structures for plants) placed in garden and danger from lighting strikes. Posts are 3 meter long rebars and they are about 1,5 m driven into ground. Around ...
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3 votes
2 answers
244 views

Disposition of the generators on the shipwrecked Costa Concordia

Recently I have been reading about the shipwreck of the Costa Concordia, unfortunately what I read is not online, so I have no links, but it raised a lot of questions. A rock hit by the ship tore a 50-...
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1 vote
0 answers
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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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1 vote
2 answers
71 views

Why would an oxygen concentrator warrant an "Oxygen in Use" warning for firefighters?

I needed to use a medical oxygen concentrator for a short period, and I found it strange that it came with a warning label I was supposed to put in the window so firefighters would know it was there. ...
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Does electricity go through non-metal materials or not?

Ever since I was a little boy, I've always had this idea that electricity can only go through metal materials. For example, if I put a 100% metal screwdriver into the socket in the wall, I'm going to ...
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0 votes
1 answer
45 views

Safely Measuring Voltage from Solar Panels in an Experimental Research Field

I'm installing solar panels (not connected to the grid) in units out in a field for research we're doing that looks like this (this is an outdated image, but I can't find the updated one unfortunately)...
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1 answer
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Should we split a building containing a factory and a storage according to (NFPA 13) code?

I asking for a building that contains a desalination plant and a storage of water bottles (in carton boxes). Should we split the factory and the storage or not (according to NFPA 13)? And which ...
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4 votes
1 answer
1k views

What is this locking pin for a hinge called?

The following is a picture of a locking pin for a tubular hinge which specifies Maritime use. I assume it has something to do with railings but I'm thinking of fabricating my own similar hinges. "...
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Need advice on how to detect an object in the way of a closing door

I have a system design with a 149oz-in stepper motor for opening/closing a drawer style door. My cross sectional dimensions of the door opening are 20" width by 15" height. The motor ...
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3 votes
1 answer
211 views

Gas kitchen stove in skyscrapers

I have watched a property tour around an apartment in the Steinway Tower (NY) on YouTube and I noticed one detail that bugs me, namely gas stoves. In Poland it is very uncommon for new blocks of flats ...
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0 votes
2 answers
138 views

How to manage two control loops as safety when BPCS is shared?

I am trying to wrap my head around some excerpts from: CCPS Layer of Protection Analysis CCPS Guidelines for Independent Protection Layers and Initiating Events IEC 61511 I am trying to understand ...
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0 votes
2 answers
47 views

How is fire risk reduced in dense contemporary timber neighbourhoods?

In the Middle Ages most buildings were made from timber. After large fires timber was restricted or outlawed altogether and brick and stone became the preferred building materials, e.g. in London ...
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4 answers
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Can I safely cook on High temperature paint?

Like a million others, I have a set of enameled cookware that has seen enough use that the enamel has boiled, burned, or chipped off down to the cast iron substrate. Surprisingly, the outer painted ...
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2 votes
4 answers
175 views

Swing safety: maximum load of beam (supported at one end, free with load on the other)

My husband and his dad built a fort for our two boys. Coming off of one side of the fort is a 4x6 wooden beam with a tire swing attached at the end. It is supported on one side by the fort, but not ...
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3 votes
2 answers
51 views

H2 Sensor in N2 environment

We develop a test station where we might have H2 leakage. To prevent explosion we are considering intertisation using N2 gas (primary explosion protection). However we also want to detect leakage ...
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1 vote
0 answers
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Is surgical and medical mask based on static electricity?

Is surgical and medical mask based on static electricity? By static electricity I mean like 3M N95 mask with at least two different layers of positive and negative static electrical layer. I googled ...
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1 vote
0 answers
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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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2 votes
0 answers
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What is the test procedures for a flame arrester?

A flame arrester is basically a heat exchanger in front of the tubulure. It conducts the heat of flame to some other place (to the liquid and/or the container especially if the container is built from ...
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-2 votes
1 answer
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Public data re possible estimate of baghouse efficiency. Plus characteristics of chromium emissions. Thanks!

I'm doing an article on a company whose Title V Operating Permit is currently under review by state regulators. (See biographical note below.) See also my specific questions, numbered below. Most ...
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0 votes
4 answers
101 views

How is it possible that it took until the 1950s or even longer before they started using car belts and neck-supported seats?

I've spent a large amount of my life thinking back on past times, both long ago and "recently", meaning ~1950s to me. A lot of things make sense, but some things just fundamentally baffle me. One of ...
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1 answer
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How exactly do respirators seal out pathogens?

A "respirator with a rating of P100, has been tested to be proof against oil, and tested to filter 99.97% of all particles 0.3 microns in diameter or larger.' As you know, an atom is 99.9999% empty ...
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3 votes
3 answers
2k views

How to remove protective valve cap from CO2 cylinder?

I have received a CO2 cylinder from an online seller fitted with a protective cap over the valve: I understand these should unscrew, but this one appears to be stuck very firmly. Is there a standard ...
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2 votes
1 answer
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Do pressurised cans still pose a risk to bursting in normal conditions, but after being exposed to heat?

We're planning on shipping some items from the US to Australia as you cannot get them here, that being: https://www.chewy.com/sentry-stop-that-noise-pheromone-dog/dp/56486 I have been in contact ...
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1 answer
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Alternatives to sawstop technology

Sawstop table saw braking system works by putting a low voltage on the blade, and when it detects that voltage shorted to ground, the blade is retracted and slammed into an aluminum block. The claim ...
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1 vote
0 answers
40 views

DC Inverter motor AC utilization category

I am looking at specs of an air conditioner unit. It uses DC inverter technology and maximum current listed as 21.5A So are DC inverter motors considered resistive or inductive? What utilization ...
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2 votes
3 answers
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Pivoting trailer gate on multiple axes

I am currently trying to design a rear gate to retrofit to an existing caged trailer (similar to image 3), with the goal of having a system where the rear gate can pivot down (on its bottom edge) to ...
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6 votes
3 answers
125 views

How are dangerous to build things studied?

How are dangerous to build things studied? Such as, nuclear reactors, jet engines, sawing machines. How do engineers discover, how they ought to be built, while avoiding getting or getting others ...
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1 vote
1 answer
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Reverse vs Drive When Slipping Backwards

I was trying to drive up an icy hill with a front-wheel-drive car (2006 Honda Civic Hybrid) when the front tires lost traction and the car started to slide backwards. The car then easily spun sideways ...
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1 answer
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What is the actual difference between a control function with Securtiy Integritiy Level (SIL) II and one without?

Consider a simple example: there's a vessel with water and a continuos level sensor (4-20 mW signal) there's a water line with a magnetic valve, feeding the vessel When the water level is below a ...
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1 vote
3 answers
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Mapping of vehicle to its horn sound

From the "meep meep" of the smallest scooter to the "BLLLAAAAAGGGGGHHH" of the largest seagoing container vessel, vehicles seem to have horn sounds that, in an auditory way, seem to indicate their ...
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2 votes
1 answer
71 views

What (if any) are the engineering limitations for producing "simulation" exoskeletons

To clarify the title since it cannot be said within the word limit: A "simulation" exoskeleton, is an exoskeleton that doesn't exist to support a disabled user's movement or to help someone carry ...
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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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0 votes
5 answers
8k views

Is it safe to stand on a toilet bowl?

As most westerners know well, ceramic toilets are designed to be sat on, even by those who are quite overweight. However, since it's customary in Asian countries to squat when using the toilet, some ...
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7 votes
2 answers
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Industry standard factor of safety for ballast design

What design standards exist for the design of ballast against uplift forces, and what factor of safety against uplift do these design standards promulgate? I am familiar with a typical FS of roughly 1....
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