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Thanks Gr8blu, all my searches seems were unsuccessful.

Hello, We have a separate battery room for our [6 x 45 kW] UPS systems, housing around 250 VRLA lead-acid and NiCd batteries, with ATEX-certified lighting and ventilation. We want to install a battery monitoring system (BMS), with the main unit located in an adjacent, non-ATEX room. However...

Thank you all for your comments. Update: We have checked with a thermographic camera the wire connections inside all the rest marshalling cabinets and found no other issues. Is there anything else to prevent this from happening again?

Hi all, During an annually check we have found that inside an ESD marshalling cabinet, one of the two parallel PSU 230VAC/24VDC-40A was not working because the 230 VAC feeder screw terminals and cables (6 mm2) were burnt. The terminal plastic insulation melted, phase and neutral came to...

1503-44 Case 2: You will send 659 std m3 to the city during 1 hr, at a delivery pressure of 15 barg. When your pressure drops lower than the city line, you can no longer deliver to the city, so you open the vent and blow down the last 318m3. That is correct. Do you have the 15min requirement...

1503-44 I use 0 degC and 1.013 bar as normal conditions. This makes our calculations be different by 5,6% which is ok for me. Case 1 is as you described. Case 2 is also as you described. The rest of gas is, as you said, 318 std m3. Case 3. Sorry, I should have mentioned that there are two...

A first cost estimation is 350 k euro. One significant cost is the 3.5 km (between compressor station and distribution network) pipeline of 4". I am not sure what you mean as restart gas. ESD, correct, will always go to vent. The requirement "must drop to 7 bar in 15 minutes" is the design...

Hi, thanks for your replies. LittleInch, correct, only 2/3 of gas is "saved". The rest 1/3 may be blown-down. The time needed to inject the gas into the city distribution network is not 15 minutes, it is 1 hour. So the flow rate is closely to 1000 Nm3/h. If the compressor needs to be blown...

Hi, We have a compressor station where the process vent gas is 1000 normal m3 for each stop. This gas quantity is now released into the atmosphere. The total number of venting actions is about 20-60 per year. If we inject this quantity into a lower pressure network (city distribution network)...

Thanks for all the replies. My guess is that instead of 264 psi it should be 1264, and instead of 285 psi it should be 1285. I did have the opportunity to look in the valve documentation, but I let you know if I find the answer.

Hi all, Could someone explain the discrepancy in the pressure, in the tag of photo? Is it possible to have a #600 valve, and the MOP to be 264 psi at 80 degC and 285 psi at -24 degC? https://res.cloudinary.com/engineering-com/image/upload/v1617037124/tips/valve_tag_pveaye.pdf...

Hi all, During a safety seminar the safety engineer presented the video of Pemex Reynosa September 2012 explosion. But without any further information. As I understand, in 0:32, the above ground pipe (or maybe a valve or metering unit ? ) is totally ruptured and then the pipe rotates, almost...

Asking the vendor to test/examine it, is a good idea, thanks.

LittleInch I don't have a design but here are 2 photos.

Hi EngineerTex Thanks for your answer. No , I have not found any explanation to the problem yet. 1. Yes 2. The only path is the 20mm thickness steel plate that separates the "dirty" gas area from the "clean" gas area. Even if there was a leak by passing the filters, this leak would still had...

Collapse dp is 2,2 bar according the data sheet. Based on this collapse pressure we set the max allowable dp at 500 mbar, (the 500 mbar dp switch did not activated). The data sheet has no information about max momentary pressure. Pressure relief devices are much higher, over 80 bar, while the...

We had a natural gas filter differential pressure reading that we can not explain. Maybe someone could help. The equipment is a filter OD 1320mm horizontal pressure vessel, design pressure 80 bar. It contains 37 cartridges D192mm X d90mm X 878mm. Design flow 500.000 Nm3/h at line pressure 40...

I was thinking of a lever based machine that could scale down a larger drawing, like a pantograph. Pantographs, invented in 17th century, are widely used to make miniature engravings. So, perhaps pantograph technology was invented 35 centuries earlier? Any other low technology (except hanging a...

Without magnifying glass, what other way is there to scribe this drawing on a 36 mm sealstone?

Thanks for the idea, itsmoked.