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Hi, Can anyone advise me on where I can find information on standards for wiring identification protocol. We are using a system at present which is quite complicated and I would like to see how common it really is. The system comprises of a four digit component number and a couple of other...

Thanks for your input. The HP side is at present 18 Bar which is alot higher than these compressors like to run (bitzer). Our problem is at present we are offshore vietnam and this system is in use - it forms part of our dive ships life support system for the divers. I think the best short...

We have recently changed our gas charge from R22 to 407. This is on a fairly small (15 kw) seawater cooled glycol chiller. The system seems to struggle and with the seawater cooling side running less cold than it used to (32 degrees C seawater) we are having trouble getting the glycol really...

Hi all, I have recently purchased an atomotive style a/c compressor for an emergency glycol chiller on a small boat. It was sold as a 3kw output however on measuring we have only 1.6 kw. The engineers say it is working finem My question is that in the spec it says operating speed 800 rpm -...

Can anyone tell me the common forging spec steel which would be used in the usa. It would be the equivalant of the british spec BS1503-224-490 LT50.This has a tensile of 500 - 650 n/mm2 and a yield of approx 350 n/mm2 . I have been offered ASTM350 LF2 but its yield and tensile values are not as...

Can anyone tell me the common forging spec steel which would be used in the usa. It would be the equivalant of the british spec BS1503-224-490 LT50.This has a tensile of 500 - 650 n/mm2 and a yield of approx 350 n/mm2 . I have been offered ASTM350 LF2 but its yield and tensile values are not as...

Thanks for all the input guys. The problem that we were worried about is the impacting damage that a needlegun may cause ie. hardening. I cant work out any reason why this should happen but there does appear to be a well heard rumour that it needle gunning may harden plate. I dont think there...

I am requiring some of the original certification of a vessel built to ASME / USCG . It does not have a nat board number on it and was built in early seventies. It does have a uscg number on it though. I called the NB but they told me that the builders did not start registring reports with them...

I am wishing to remove some local corrosion from the inside of a pressure vessel. Although it is quite deep, it does not go past the corrosion allowance. I wish in a few months time to have the vessel gritblasted, however we require to leave the unit in service until that time. Is there any...

Hi, Can anyone tell me what thickness under BS5500 pwht and normalising of dished ends starts at? Thanks alot. Neville

Im hoping somebody can help out there. Im needing to make a very efficient and compact dehumidifier. We have only a small amount of air flow available, so im trying to select the correct type of coil. Ive been offered a type of coil which is like an oval or squashed type tube, aluminium...

Thanks for the remarks guys. It is not under asme juristiction but I was really keen to know what you would think about it. The nozzle does not need to be on the weld intersect, as there is plenty space elsewhere. Anyway we will do some ndt as there are a few other questions over the vessel. It...

We are looking at purchasing a vessel which has been constructed to an italian RINA code approx 20 years old. We have found that it has a 2" nozzle which intersects the main circ weld from rolling to dished end. Rina were not bothered but i am wondering where we would stand with ASME or even...

Thanks for the replies. The engine is not a particular modern overhead cam, its pushrods. I had not thought about the compression change though. It is turboed to over 2.5 times its normal naturally aspirated version so the compression ratio has been lowered in any case. Our trouble is...

Just a simple question. Can anybody inform me what the max depth of cut normally allowed on a valve seat ? I have an engine and one of the seats is badly pitted in one very small area. Depth of pitting is approx 25 - 30 thou. Can i have this recut ? Engine is a diesel 4 litre 4 cylinder ford...

Thanks for the replies. The pipe is 45 feet long and weighs approx 6000 lbs, and there are 2 to be done. Each with approx 20 holes. The main problem i have with these cutters is speed and cost. The last time i used them as i have said was on boiler plate and it went blunt after probably one...

Tomorrow I need to drill approx 20 x 2 1/2" (63mm) diameter holes through the side of a 18" diameter steel pipe. The holes are to take pins. I have thought of two ways to do this - a) magnetic base type clamp on drill with a 2 1/2" cutter. this would be the ideal way but the pipe grade is...

Thanks deanc. Over here in the UK and under the new PD, you can simply fabricate a pressure vessel to the relevant code ie 5500 , have the design and build + test overseen by a class society such as Lloyds or ABS etc, and thats it. Quite simple. Seems quite complicated in the USA!

Deanc: Ok, Im beginning to get it now. To change track a bit, would some jurisdictions allow a BS or PD5500 vessel in ? I presume this would be a question I would have to ask the National Board directly, I do find it quite difficult to get the correct information from these bodies sometimes.

Ok, I spoke to ASME again today. They told me that it does not need the repair done by a R stamp holder to be allowed in the USA. I suppose that may be true as there arent many R holders compared to U holders. As clear as mud but ive got another telephone call scheduled with ASME tomorrow...