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If I can get out of impact test I can increase the design temperature to -48F.

According to my copy of B31.3, which is only 2004 ed, Section 3 Table 323.2.2 if the material is listed in curves C & D no impact testing is required if you are using impact tested consumables according to AWS. The problem is A333 grade 6 is not assigned to a curve in Table A1 only a...

Sorry -48 degrees C

I have pipework made from A333 Grade 6. The code gives it a minimum temperature of -50 degrees C. Are impact tetsts required on the PQR?

I am not sure about P265, but P295 is listed in ASME 2D. Its a basic carbon manganese presssure vessel steel with a minimum tensile strength of about 410N/mm2 with a yield stress of 265N/mm2. According to the British Pressure vessel code PD5500:- P265 has a design strength of 176N/mm2, A516...

Why don't you make the vessels? You don't have to be approved to make vessels to the PED. You may need the services of a notifief body to inspect them, depending on there risk category. You can get a free copy of the PED from http://www.dti.gov.uk/strd/ped.pdf Regards John www.gowelding.com

I have some information on the desin of square vessels that I can email to any one interested. jd@gowelding.com

You normally push the puddle except for fluxed processes, such as FCAW, SMAW etc. which you must always drag otherwise you get slag in the form of wagon tracks. The slag you drag !! Regards John www.gowelding.com

Not sure what an A500B is as I don’t have the spec. However if it were a normal weldable carbon manganese steel you would use a higher alloyed stainless filler wire such as a 309. The problem is dilution, as you mix carbon steel with stainless steel you create a chrome steel which is very...

It’s not just ASME, you will find most codes have increased allowable stresses over the years. I suspect that ASME are trying to make their code competitive, so as to keep its lions share of the International market. In fact, pressure vessel design stresses in Europe are fixed by law! under...

Brazing. Brazer approval BS EN 13133:2000 Brazing. Procedure approval BS EN 13134:2000 Regards John www.gowelding.com

Slip on Flanges, because they are fillet welded are not suitable under fatigue conditions and for use at high temperature. I think The British Pressure vessel code, PD5500, limits the maximum temperature for fillet welded flanges to about 370°C. You can't do meaningful NDT on slip one...

The best way to control distortion is to reduce the amount of welding; use stitch weld instead of continues ones, if possible and use smaller sized welds where possible. The problem with predicting distortion is that it is dependant on so many variables and it will occur in all three...

You first check FIG UCS-66, if you are above the graphs no impact testing is required. If you are below the graphs you can apply UCS-66.1, which may lift your temperature above the graphs in UCS-66 and relieve you of impact testing. However you don’t need to use UCS-66.1, you can ignore it and...

A certain country, renown for its pasta and fast cars, started exporting small air receivers with no corrosion allowance to the UK. The UK inspection authorities got together and said we are going to increase the frequency of inspection on these vessels because of the increase in risk. However...

The British Standrd BS2633 for Class 1 pipework states :-The toes of adjacent butt welds shall, whenever possible, be no closer than four times the nominal thickness of the pipe. Because you dont want HAZs clashing. Regards John www.gowelding.com

I can send a suggested working form for a full face flange to British Standard PD5500. It’s a very simple method that requires huge bolts, which I have never really understood, but it works. It’s for low pressure flanges working below 150PSI. Regards John post@gowelding.com www.gowelding.com

I suggest you talk to a good consumable supplier. There are three main types of electrodes:- Basic typical E7018, these electrodes need baking to achieve low hydrogen, which is their purpose. There is a limit to how many times this can be achieved before the coating degrades. Rutile...

The AWS method of calculating pre heat tends to be conservative. The European system tends to give lower temperatures but is much more difficult to apply. I have some info on preheat, including a calculator, which I can E-mail to any one interested. The problem is hydrogen cracking which is...

According to the ASME code 304L is not suitable for temperatures above 800F. You need 304H to go to the full temperature of 1400F. This is presumably because of the risk of creep, 304H having better creep performance than 304L due to its higher carbon content. And the advantages of using...