Most of the AST that ive been involved with related to API 653 works
show otherwise. Some lean on one side, others show a bottom plate
that is in distress, some have the bottom shell and annular badly
corroded, etc. Its very rare that i see the tank nozzle and the
piping having a problem that will require repair or alteration.
And i havent seen an adjsutable support either near the nozzle/pipe
interface. Not in my decades of work with API 650 tanks.
Settlement is an indication htat something bad is happening to your
tank and therefore an engineering assessment maybe needed. If the
assessemt shows that no further action is needed ( i doubt it) - so
be it.
- In PipingDesign@yahoogroups.com, abdul aziz vayani
<azizvay72@...> wrote:
>
> Hi Mahdi
>
> As far as i understandand that tank settlement will change in
vertical distance (in case of nozzle located at elevated position)
or vertical clearance in grade level piping. In both cases you can
handle this situation by providing screw type adjustable support. In
this support you can adjust the TOS (top of support) as per BOP
results in settlement of the tank.
>
> Cheers
> A. Aziz Vayani
> Sr. Facilities Design Engineer
> Clough ----- Pakistan Operations
>
>
> ----- Original Message ----
> From: mahdi_amb <mahdi_amb@...>
> To: PipingDesign@yahoogroups.com
> Sent: Sunday, April 1, 2007 7:18:10 PM
> Subject: [PipingDesign] settlement
>
> Hi all
> In the LAVAN LPG project we have some LPG tanks. After hydro test
> according to soil reports we have 1 to 2.5 cm settlement and time
of
> this test is 3 months. So according to project conditions we have
we
> don't have enough time. And we have to change the piping routes.
So
> here I need to help.
> What can I do?
> We want to not buy expansion joint or loose flange can we use CAN
> support (negative springs) or not?
> If we have to use expansion joint do we have special standard
about
> this one or not?
>
> Please help me.
> Thanks advanced.
> Mahdi.N.R
>
>
>
>
>
>
>
>
> Bored stiff? Loosen up...
> Download and play hundreds of games for free on Yahoo! Games.
> http://games.yahoo.com/games/front
>
> [Non-text portions of this message have been removed]
>
Received on Tue Apr 03 07:06:00 2007