In the testing of weld hardness for welding procedure qualification I find that I am concerned over the preparation route which may be affecting the values I am getting.
As the hardness limit is 250HV10 (sour service applications) and materials are strong we are often working close to the limit...
We have a number of ASME VIII Div1 pressure vessels that have seen 28 years service. Fabricated from ASTM A516 Gr 70. Also several possible degradation mechanisms.
Some of these have been hydrostatically tested after modifications.
However there are several that have had no test since...
We have a lot of unpainted carbon steel pipes on our plant which are outdoors.
I am increasingly seeing an unusual corrosion on the outside of the pipe which penetrates deep into the pipe and can lead to leakage.
The "pit" is faily wide and filled with dense corrosion product - generally dark in...
We use API5L Gr.B and ASTM A106 Gr.B piping. Recently we have had quality issues; one batch of pipe had ends that were not cut square; another batch had eccentric OD and ID resulting in wall thickness below the minimum in one position. Dimensional issues make fitting more difficult and can...
I have run a welding procedure test to ASME IX. Details:
2" sch 40 pipe butt weld with GTAW using an alloy 625 filler wire. 5G positon, max interpass 150°C
It has failed the tensile test: failure in weld metal - values 750 to 800 MPa.
The parent material Alloy 625 grade 2(SB-444) is...
A contractor has specififed an "as rolled" steel for the shell plates of a storage tank they are building. Specifically it is EN10025: 2004 S275JR + AR.
I am not fully up to speed with this option and I'm wondering about any pitfalls compared to plain normalised or normalising rolled plate...
Please can anyone tell me if there is a limit to the maximum size of set-on nozzle you are allowed on to a vessel shell?
We need to put a 4" nozzle onto the shell of a heat exchanger and would find a set on preferable to a set through.
I've had a look but cannot find anything defining a limit -...
I am examining a carbon steel 6" ASTM A234 WCB standard wall elbow that failed on a gland water line (contains slightly alkaline condensate at approx 85°C.). We found the problem when a fine jet of water was spraying out of the elbow.
It appears to have failed from the outside due possibly to...
The management of the refinery I work in want a lot of painting done by operators and fitters to improve the look of the place. This painting will not be done with proper surface preparation (cleaning/blasting) nor special paint systems. They will be brush painting a general purpose paint out...
Does anyone have any experience with external (UT) inspection of API650 tanks for corrosion of the annular plate?
I have an ø18m tank, 27 years old, carbon steel containing hot caustic soda solution. This cannot be taken out of service without vast expense. I am concerned over annular...
I need to obtain a carbon equivalent value for an ASTM A516 steam drum on a boiler. I can't go cutting lumps out of it and a mobile OES PMI is not something I can get done easily. So I am thinking of doing the following:
Using a tungsten burr, clean up area to remove contamination and oxides...
We have 24 process tanks (ø12.8m x 31m high) for which the main construction material for given as DIN 17100 RST 42/2.
They were constructed circa 1980.
We need to do some design recalculations and must have some properties: ideally allowable stress, otherwise Tensile and yield strength...
I am looking for details on mechanical properties or a direct european equivalent to 1518 carbon manganese steel
The application is a large angle valve disc (12"), which is to be threaded and welded to the valve stem and have a stellite 6 weld overlay on the disc seating area.
The best I can...
I need to set a time limit on keeping PWHT records.
These are for modifications and repair work of low carbon steel piping in an alumina refinery.
I am looking for some idea of what other people do so I can be realisitic (rather than keep everything)
I am thinking 5 years - does that sound...
