We have a 3” and 4” condensate piping system from a flare drum to an oil settling tank. These lines pump condensate to an elevated oil settling tank via an intermittent pump which leads to liquid condensate remaining stagnant in low lying areas of the piping leading to corrosion with resultant...
Guys, I’ve got a little problem with some 316L steel fittings on a 316L pipe used for an auxiliary cooling water vent line. The fluid is sea water with 5ppm sodium hypochlorite and at ambient temperature and low pressure conditions (1.5 – 6 psi).
The fittings have only been in service for just...
Guys,
I would appreciate some education on the minimum oxide thickness required before cleaning should be carried out in planten superheater tubes in a coal power plant. The tube material is 2 1/4 Cr.
Any suggestion is highly appreciative
@metengr, thanks for your info. The code of construction should be the french construction code.
@micalbrch, yes i meant to say the corresponding ISO, BS or EN standards and not alternative materials. Thanks
Hi there,
Please am wondering why its so difficult searching for equivalent material specs online. Does anyone know of a site that easily compare diff standards and give you their corresponding equivalence for high temperature materials?
I had been looking for the equivalences for the following...
Thanks StoneCold, but when we tried wire brushing it was peeling off the galvanised coating in our case. I want to completely remove the concrete so i could NDT them. Some concrete just too 'stubborn' to go off?
Please would appreciate if anyone there know of how best to go about removing concrete that have 'glued' to threaded bars. The bars are galvanized and so i do not want to damage the coatings in removing the concrete. Any help would be greatly welcome. Thanks
Hi please,
I would appreciate if some good people out there could help me with how i could distinguish between a hot dip galvanized bolt sample from a zinc passivated one. What test requirements could one likely carry out or inspection techniques.
many thanks
I appreciate the shared knowledge of experts in the house and I guess this forum has been of great help to upcoming young stars who aspire to grow in the profession.
Without further ado, I have two in - service failed package expansion boiler tubes. The tubes had failed at the interface...
Guys,
I have been able to get photos.
Please see for yourselves and any suggestions would be appreciated.http://files.engineering.com/getfile.aspx?folder=dc682cd1-b728-4bd4-b1ce-251ebc72c720&file=Cross_sectional_view_of_bolts_failure.pdf
Swall,the bolts were forged.
TVP, ISO 898-1 only specify the mechanical properties for sizes d>39. On the chem properties, no mention was made wrt to d>39.
I was also thinking the limits for hot shortness was 20:1. Do you please have a reference on ratio being ~8:1 as stated?
I think the...
Wrenchblender,
thanks for the info but stress corrosion cracking is less likely as there was no corrosive environment. The bolts were used to clamp two identical shells weighing.
dbooker630,
do you know if there is an equivalent BS spec of SAE J1199?
In addition, the analysis gave C,Mn,S,and...
Please I would appreciate if experts in the house could help.
I have some high strength steel bolts (M48 x 210mm) of grade 8.8 which had failed in service (along their bolt-heads). My initial suspect was manufacturing defect. Does anyone have an idea if ‘hot shortness’ could be a possibility...
Please would appreciate members help here.
We usually carry out metallographic etching of 9 Cr steels (P91) using Villela reagent. However, one of our customer does not allow the use of this etchant due to restriction on Picric acid.
As an alternative, i have come across Fry's reagent (5g...
I have a bar made up of 35MF 6 and to be coated with Cr MAT 5/10um, the material standard that is used is the NF A 35-562. Please what is the material make up and the equivalence in ISO standards. Would also like to find out what would be the hardness , and if possible the coating thickness. Thanks
I would appreciate to know why Nitrogen is used during the transport of carbon steel vessels. In addition please, I would appreciate to know some insight into what sort of provisions are to be in place to ensure the conservation of the protection under nitrogen and the coatings during the...
Would appreciate to know why Nitrogen is used during the transport of carbon steel vessels. In addition please, I would appreciate to know some insight into what sort of provisions are to be in place to ensure the conservation of the protection under nitrogen and the coatings during the...
Would appreciate to know why Nitrogen is used during the transport of carbon steel vessels. In addition please, I would appreciate to know some insight into what sort of provisions are to be in place to ensure the conservation of the protection under nitrogen and the coatings during the...
