Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

subsea pipe in pipe insulation - 2

Status
Not open for further replies.
heyjaehey

heyjaehey

Civil/Environmental
Joined
Dec 2, 2008
Messages
10
Location
GB
Thank you so much for the replies I got.

I think I found out the calculation and it is the result I have.

Initial oil temp = 250F
Length of pipeline = 25km
Insulation material = polyurethane (k=0.025)
Surrounding temp (temp sea water) = 39F

I get the final temp at around 125F with 1in thick insulation. Could someone verify this please? It just sounds like too good to be true.

I am new to this industry and I don't have any previous project that I can compare this against.

Thanks!
 
Sort by date Sort by votes
25 km isn't much. 125 is probably about right, but don't take that as verified.

What's the cP values at 20ºC and 90ºC

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
 
Upvote 0 Downvote
and pipe diam, flowrate etc.

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
 
Upvote 0 Downvote
In my opinion: If you think you need confirmation then you should get somebody in your company/office to do a formal check/QA on your work. I have been in this line of work for 14 years and i will always have somebody look at my work before handing it over to a client.

We use an old fashioned stamp/signature and file check copy QA system - it works! I often get "blind" to my litle typos.

Best regards

Morten
 
Upvote 0 Downvote
Stupid me, I left out some important information.

flow rate is about 2000m3/day with 5" diameter pipe.

Yes it has to go thought internal check but I was just curious.
 
Upvote 0 Downvote
Should be about right. There will be a lot of cooling with a small diameter line.

cP values ?

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
 
Upvote 0 Downvote
just new guy come here .
not familiat about yout mentioned field .

before you do it .you should confirmation it .
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

VladimirWH
  • Locked
  • Question Question
subsea equipment - cable tray for "spare" cables
Replies
1
Views
579
LittleInch
LittleInch
Ahmed s
  • Locked
  • Question Question
RISER PIPE SPLASH ZONE PROTECTION - monel or neoprene
Replies
9
Views
1K
1503-44
1503-44
J
  • Locked
  • Question Question
Load cell placement in load pin
Replies
9
Views
5K
jayakumaran
J
subsea_engineer1105
  • Locked
  • Question Question
CRA-clad and CRA-lined Pipeline Failures
Replies
18
Views
2K
subsea_engineer1105
subsea_engineer1105
escapizm
  • Locked
  • Question Question
Q) Birdcage buckling a phenomenon in a subsea armoured power cable!
Replies
6
Views
1K
escapizm
escapizm

Part and Inventory Search

Sponsor

Back
Top