Questions tagged [safety]

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8
votes
2answers
12k views

Will PVC build up an electric charge and cause a spark?

I'm working on an application in which sparks (specifically from static discharge) present a severe safety hazard. One component in question is a piece of PVC water pipe. It has been proposed to "...
3
votes
1answer
188 views

Service Life of a Flashback Arrestor

First of all, I would like to know about the service life of a flashback arrestor. In my laboratory, I got three flashback arrestors {WITTgas RF53N(1/4”NPT-F), Brass} from the ex-students who used ...
2
votes
1answer
71 views

Is there such a thing as a voltage level that is safe for humans in all circumstances? [closed]

My question is naive but I'm having a hard time finding a precise yes/no answer when I ask google. The general advice seems to be "it depends", but are there voltage levels where it really does not ...
0
votes
2answers
112 views

When backup cooling fails in reactors without passive safety, what is the risk of radioactive contamination?

Most/all nuclear fission reactors require cooling. Due to radioactive decay heat, this is true even when the reactor is switched off. Hence, there are requirements for nuclear plants to have power ...
5
votes
1answer
490 views

What is the difference between being UL recognized and being UL listed?

A product can be UL recognized or UL listed. I understand that there is some difference between these two things, but I have never had a full and clear explanation of the difference. What is, in fact, ...
0
votes
1answer
861 views

Exact procedure to mount a blanking spade near a butterfly valve

This is a follow on to my previous question about blanking spades. There's a gas pipeline with a butterfly valve mounted between to flanges. I want to work on one side (call it the inert side) and ...
1
vote
1answer
130 views

What are best safety practices for visits to waste water treatment plants (WWTP)? [closed]

In my position I'll frequently visit wastewater treatment plants, often when refurbishments work happen. What are best practices I should adopt to avoid accidents?
2
votes
1answer
76 views

Device to remove condensate, without creating a hazard (EX) zone

I have gas pipeline with biogas, low pressure - approx 40mbar over atmosphere. I want to remove a small amount of condensate, inside a building, without creating an ex-zone. Small amount: I honestly ...
7
votes
2answers
3k views

How are blanking spades entered into gas pipelines?

I often see specifications for refurbishing works on gas pipelines calling for blanking spades, to separate the area worked on from the rest of the gas system. This is in addition to closing valves. ...
3
votes
2answers
474 views

First glance: structural integrity of this roof

There's a rooftop we recently discovered with a great view, and it's easily accessible for us. Obviously we'd like to go up there a bit more, particularly in summer with a couple of fold up chairs or ...
3
votes
2answers
2k views

Will lightning strike an aluminum rod in a pot on my balcony?

I have some tomato plants on my balcony (4th floor in a 7 story building). The balcony is a recessed one. The building has lightning protection on top. To support them, I put a 2 m long aluminum rod ...
5
votes
1answer
153 views

What drives improvements in seismic safety?

I get the impression that a lot of old buildings fail to meet modern earthquake safety norms, and need to be rebuilt or retrofitted. But what has changed in the last few decades that would make a ...
2
votes
2answers
149 views

How does one define 'safe' in engineering?

What is safe and what is acceptable in the context of Engineering. Specifically speaking we are in the process of designing a test rig which will pump water. What is a maximum safe temperature for ...
27
votes
4answers
13k views

Which is Worse: Car vs. Car or Car vs. Wall?

So I got myself questioning what could be worse for the driver... a collision of two identical cars at equal speed (frontal crash) or the same car with the same speed crashing through a wall? The ...
44
votes
9answers
6k views

My customer wants to use my products to do something unsafe. What is my ethical obligation?

We sell products that attach to a motor drive's DC bus. We also formerly sold diode kits that let you hook one product up to multiple drives. We stopped selling those diode kits because they were ...

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