Dear all ~!
We designed M90 stud bolt and heavy nus for tightening two flanges with bolt tensioner . End user request to add Belleville spring washers .
But if we use Belleville washers , Tentioner side washer absorb some of tension when tentioner released because this side nut turned by hand...
Dear All
We have very urgent and critical problems on operation starting stage of boiler feed water heater. The heater was erected after hydrostatic pressure test at fabricator's shop without any problems.
* Shell --- SA516-60 ,ID1130 * 44t
* Tubes ---SA268-TP430 , OD25.4*2.108t*3250L...
Dear Mr.
In ASME ,Mandatory Apendix 5 ,"Flanged and Flued or Flanged only Expansion Joints" clause 5-4(f) says that
Nozzles,backing strips,clips,or other attachments shall not be located in highly stressed areas of the expasion joint , i.e., inner torus, annular plate and outer torus.
We...
Hi
Anybody knows proper plate mill maker who could supply plate as following specification .
"" Carbon and low alloy steels shall be limited to a maximum yield strenth (Re) of 355 Mpa and maximum ultimate tensile strength (Rm) of 620 Mpa ""
Plate supplier could guarantee 430 Mpa ,Maximum...
Dear Sir ~!
Should a nozzle be made a forged body when design base on below specification of pressure vessel?
*** Integrally reinforced nozzle shell be used in vessels with a shell thickness above 50mm ***
We proposed 3 pieces of forged material to be welded join
, a forged weld neck...
Dear All
We are just about to perform PWHT of Heat Exchanger Shell have 20 mm thickness ,2000 mm Dia ,6000mm in length,SA240-321 Material.
PWHT temprature and hodilg time is 900 degree centigrade for 4 ours minmum.
We have no experience PWHT like this high temperature for long time for the...
Any Idea?
When move QC office to another building , All RT film was lost for a item completlty .The report was found and AI have the check sheet his own for the item.
But clint inspector not yet reviewed it.
He is requesting to reshoot all lost film arguing RT film must keep until final review...
Hi ~!Specialist
Anyone who know the suitable welding rod material for
welding 9cr to A410 stainless steel ?
We failed qualification test using 309 welding rod .
The cost is too fuge when we use Inconel welding rod
(ER NiCr-3 )because calculated required welding rod is 3000 kgs...
Dear All ~!
I have one question for the tube to tube sheet welding of heat exchanger.
We did 2 layer strength welding on tube end which have high-integrity weld figure as specification and dye penetrant test.
This welding figure was selected without RT by client's design engineer.
But...
A Pressure Vessel ( Mat'l : A516-70 * 26 t )was Hydrostatic pressure tested after PWHT and Ship out to site. .
But Internal clip (8 t * 200 W ) is requested additionaly to attach insid of Vessel with 6mm fillet weld .
Welding will be done after preheating and after heating with 212 F .
I...
When welding of mild and high tensile carbon steel welding using AWS F76-EH14 rod and flux ( Submerge arc welding Process ) , What is the permissible number of times of flux reusing for welding quality control standpoint ?
We had an experiance that when we use mixed flux ,half new flux with...
Mill maker want deviation for the hot tensile value at 340 Degree C as belows.
* Material : SA 387 GR. 11 CL.2
* Tension : To be >/= 425MPA instead of >/=515 MPA
* Yield : TO be >/214MPA instea of >/=240 MPA
In general note (b) of table U of ASME sec.11 ,it mensioned that the...
When external pressure calculation of tubes ,matrial
SA213Gr.T1 and design temperature is 1004 F .
To read B Factor from the chart , the exteranl pressure chart limit value is up to 900 F .
How can we take value of factor B ?
And how about yield strenth value limit ...
