Member postings for Robert Atkinson 2

My preferred product is LPS 3

https://www.techsil.co.uk/lps3-rust-inhibitor-380ml

https://www.techsil.co.uk/media/pdf/TDS/MIPZ50037-tds.pdf

https://www.cromwell.co.uk/shop/lubricants-and-chemicals/general-protection-fluids/3-heavy-duty-rust-inhibitors/f/8711

Safe on all metals, most plastics etc. Not he cheapest but it works. Widely used in the aircraft industry.

Robert G8RPI.

Sam said " And there we go again-- back to the one in 10 million that was probably as rusty on the outside as much as it was on the inside & most people with any sense would have already said "Hey this is beginning to look a bit dodgy, perhaps we should have a look inside, or think about a new one" "

As has been said before, that tank failed from fatigue at the longitudinal weld. Look at the photo. Corrosion may have had some contribution, but not from rusting through.

Edited By Robert Atkinson 2 on 30/01/2021 17:28:24

From fatique perspective it is always best to reduce the number of cycles (the very high pressure pure air bottles that were used for early thermal imagers had limited number of refills before being scrap). Most bursting failures of cheap tanks seem to be fatique related rather than corrosion which results in leaks.

As has been mentioned more water is added every stroke of the compressor so minimising that reduces how much water enters the tank

Overall best solution for a compressor used reguarly (more often than once or twice a week or the pressure does not leak away beween uses) is just drain the water and leave the tank pressurised. If it is only used infrequenty, drain it down and leave it empty. If in a warm dry location leave th drain valve open so it acually dries out.

Robert G8RPI

At least that is indoors. There is small industrial unit down the road and every moring there are several people with small vans and cars sorting parcels outside in in the car park whatever the weather!

A lot of people have mentioned "perspex" (trademrk for acrylic) This is not the best material for clear guards and shields. Polycarbonate (Lexan) is a better choice as it has much better impact resitance. It is also easier to cut without breaking. It also has better chemical resistance. The cheapest material, polystyrene, is virtually useless.

Robert G8RPI.

I would suggest it is for cutting leather strips like thongs or laces.

Robert G8RPI.

UKNI covers the case that NI can accept CE marking, but a UK (inc NI) entity cannot be a Notified Body for CE marking. So for NI sales of items needing assesment by a Notified Body you can certify to EU CE regulations but use a UK (inc NI) Notiifed Body. This would be useful if only selling in NI.
A late breaking and odd arrangement. I would not be surprised if it changes.

As I said " The only exception is those items that have to be assessed by a Notified Body,"

The UKNI is only for Items requiring NB 3rd party approval who use a UK NB. CE marking is still accepted if you use an EU NB.

Robert.

Edited By Robert Atkinson 2 on 27/01/2021 07:53:29

If they moan they do not understand, there is nothing to stop you using one technical file for multple approvals. The only exception is those items that have to be assessed by a Notified Body, they wll have to pay for two of those.

There is no separate marking for NI they will stay with the CE mark.

The real issue is that many smaller suppliers will just stop selling into the UK because of this, customs paperwork and if online, the e-commerce act making them pay UK VAT.

Burning wood pellets produces about 5% MORE CO2 than burning coal (twice as much as gas) not including the energy used to process and dry the pellets or shipping. Leaving the trees growing and absorbing CO2 and burng coal would result in less CO2 in the atmosphere. It's not clear that new trees are being planted at the rate required to replace those cut down., never mind provide future fuel reserves.
Ships only use diesel in coastal waters. Out at sea they use heavy fuel oil typically with high sulphur content.

Robert G8RPI.

IDA is Ethanol with at least 5% wood Naptha / Meatanol or simialr.

95% IDA is 95% IDA + 5% water i.e roughly 86% ethanol, 4% Wood Napha, 5% water.

99.5% has a small quantity of water, probably through absorbtion from the atmosphere (they can't prove it's 100%)

Note that in the UK you need authorisation from HMRC to buy or keep IDA. There is a 20l per year limit for members of the public for hobby use this still needs HMRC authorisation.

https://ethanol.co.uk/products/industrial-denatured-alcohol-ida/

https://ethanol.co.uk/products/industrial-denatured-alcohol-ida/

"Meths" is completly denatured alcohol - CDA no restriction on purchase in UK. It used to be dyed purple but that requirement was dropped in 2013.

Rober G8RPI.

Edited By Robert Atkinson 2 on 19/01/2021 22:04:47

Assuming no losses charging a 50kWh (small-medium EV) battery would need a 480A 415V 3 phase supply. per charger That is 24 houses worth of supply per car.

Storage has been mentioned but it still needs to be charged, no use for a typical fast charge senario of a motorway service area running 24/7. Not sure what storage technology can deliver 600kWh (50kW in 5 minutes) though.

Also no actual hardware, just hype. They announced start of producton of Flash batteries for phones a couple of years ago but I don't see any on the market.......

Robert G8RRPI.

Edited By Robert Atkinson 2 on 19/01/2021 13:24:50

I might also have been a induction heater for bearing races

Robert G8RPI.

Still think a small resistance welder. The sort of thing used for thermocouples or electrical connection e.g nichrome heting element to copper terminal. The size implies a conservative rating for the core so a high duty cycle application. The 240 / 400V primary imples industral use. I did wonder about a filament transformer but most valves are fussy about current and 0.83V at 130A is 0.063 ohms total circuit resistance so very little tolerance for connection resistance etc. I'd expect to see a few primary voltage fine adjustment taps if it was a filament transformer.

Title is slightly misleading. Article refers to coal and oil fired power stations. Gas is going to be used for a long time and is a fossil fuel. Unless there is some unforseen storage solution we are going to need new nuclear for base load.

Robert G8RPI.

One other factor to bear in mind is volume. The stored energy and thus hazard depends on both pressure and volume. This is reflected in the regulations. There is a lower limit for gas pressure vessels of 250 Bar/Litre below which the regulations don't apply (note: steam is specfically excluded from this exemption).
When used at airline pressures most disposable cylinders are below the linit e.g. less than 2.5 litre volume at 150PSI (10 Bar).

Robert G8RPI.

The output ratings give a power of about 100VA / 100W which is not that big for a transformer.
As John H says the output voltage indicates a resistance / spot welder is the most likely application. A phot with something for scale (CD is good) would be helpful.

Robert G8RPI.

That is really bad advice and I'm surprised you repeated it here. Hazardous waste regulations are there for the protection of us, workers, the environment and future generations.
loose asbestos can be very dangerous. Depending on the exact type only tiny amount can cause health problems.

Robert G8RPI.

It's against most council by-laws. Litter bins are for litter not domestic rubbish. There have been cases of councils threating legal action aginst people putting addressed junk mail in them.

Robert G8RPI.

I was setting up a computer room at a school in Ghana few couple of years ago and I was getting shocks if I touched a computer and the metal bars on the windows (unglazed holes in wall). The wiring in the room actually looked quite decent and certainly had all the earths on the sockets connected. The teacher was unconcerned saying the students didn't mind! Further investigation showed that this newer building was wired to the main building with a length of flex supported by a wooden pole. The main building had an overhead 3 phase and neutral feed to an old MEM fuse box, No earth connection whatsoever. The school is on a sand dune so little point in even trying an earth rod. In the end I bonded all the window grilles together and to the ring main "earth" thus all exposed metal was equipotential.

Went back the year before last to do some updates and found the school was suffering power outages. They thought it was the general area but eventually I convinced them it was just the scholl becuase I could see a broken cross bar on one of the power poles feeding the school but the shops across the main road had power. The school reported it, but nothing was done. I was then taken down to "explain" to the district power engineer, That got a crew on site who confirmed my diagnosis. The then put in a emegency supply. Thi consited of getting two rolls of 2.5mm2 single insulated wire, one red one black, connecting it to the feed side of a meter (on outside wall) of a shop across the road, running them across the road, connecting to a 13A socket in the middle of the pavement outside the school. No earth, no fuses. I then had an extension lead to the computer room.....

Robert G8RPI.