pve5,
for fluid conditions given you may have to do a strength weld and then a heavy expansion of the tubes into at lest in a groove close to back face of the tubesheet.Have Shell,Tubes and Tube sheet H2S proof materials.
Metengr;
I really appreciate you answer but your explanation fully applies also to the first sentence of UCS-66(d)i.e. thin UCS-materials.
The bottom line is that under the entire UCS-66(d)rules it is hardly acceptable to endorse the use of these tubes at a MDMT of -104C and this high coincident...
Thank you Metengr for your clarification which at this point is not convincing me.As I was saying in UCS-66(d)first sentence refers to all UCS mat'ls, 2.5mm and thinner to which a MDT of -48C applies.
For the vessels/components NPS 4" or smaller in P-No.1 (which by the way is a particular case...
I have to deal with a Shell and Tubes HEX where tubes in LTCS (SA334 Gr.6)are proposed by Contractor for coincident design conditions of 67Barg @-75C.This MDMT is based on ASME VIII Div.1,UCS-66(d)interpretation for which I cannot agree as:
a) - § UCS-66(b)(2) does not include UCS-66(d) as...
The WO is by far the correct choice but the WO material must be selected to fit your corrosion conditions.If you were looking for 10mm of CA I doubt your Neoprene or Buna N seal material fit into equation .The seal material selection is as tough as body material selection and shall also meet...
at 0.009% of the pipeline volume you still have a nice air bubble (+/-2.7M3)trapped at the highest point.So this is the explanation.If the hydrotest pressure stay steady for 4-6 hours at least, then your test is positive (provided temperature does not change-but you may record also temperature...
If as per EdStainless this C fiber(is it sure is C and not GRP?) filament wound may be correct on corrosion side have a look then on mechanical strength.Pipe itself (collapse pressure at 3000M may be enormous if internal pressure is low) and especially connections (cemented bell &...
Any seriuos Engineering applies a clear split between "CONTROL" and "SHUT DOWN" functions.Then the design for the one function excludes a proper work for the other.
In these equations the Actuators design is part of segregation as each function implies different parameters especially the closing...
Tsenthil was querying about a Ball Valve fire safe design (not the test).
Fire safe design applies to both soft and metal seated ball valves but the way it is achieved is practically the same:
a)A Soft seated valves: at Seats/Ball interface the seat is designed with a lip which secure the M/M...
What are you expecting for a Subsea valve? a cheap design?.
If it's Subsea (5000ft)this must be strong enough to withstand the external pressure.I do not know your design conditions but must be at least 1500# rated.Then to stroke the valve you need an actuator with ROV overide system.
In order...
Change rather the valve than changing parts only.A Patch works shall never work.What about the valve rating?
AISI 4140is not the one to be used for the valve body.
mpg,
first of all you may see also my point in Thread292-60168.I may have to enhance here my general oposition in using the concept of "equivalent pressure "under piping code B31.3.
For HC plants the flange leakage may be of a big concern there where huge HC inventory may be...
mgp,
although your calculations are about to be correct (see prex adjustement )the design case you have selected is quite unrealistic.It is not usual to design P.Vessels/piping at full ASME 16.5 material group rating in 1500# (or even 900#) and 2500# pressure classes.
However in the case these...
