Suitable Meterial for manifold

[Khansahib]

High GOR together with small amount of sand has made a hole in wall opposite to inlet nozzle of a 10” production manifold. De-sanders are being looked into but it will take time. Meanwhile, better metallurgy is desired for the manifold to overcome the problem. I'll appreciate your recommendations. Present manifold is A-106 Grade-B

 

[0707]

Khansahib

Using the same material A-106 grade B for a provisory repair you can contact Belzona for rebuilding corrosion erosion damage for your application.In urgent repairs it works and can solve your problem.

luismarques

 

[MJCronin]

Sahib...

Suggest that you consider a thicker section of A106 Gr B (or A53) piping for the manifold section that is being eroded. An internal SS shield mightbuy you a little time....

You could also consider a small hydrocyclone to separate out the sand upstream of the manifold.

http://www.natcogroup.com/Content.asp?t=ProductPage&ProductID=103

http://en.wikipedia.org/wiki/Sand_separator

Let us know what your final solution is....

Oh...... and what is "GOR" ????

-MJC

 

[Khansahib]

MJCronin,
The hole was patched up by welding a sleeve that will buy me some time. Putting a steel plate is a good option but there are 7 nozzles in 5 meter long 10" manifold. I was told by the stake holders that sand is coming from all wells in varied quantity.

Had this been one well I could have proposed a plate, as you suggested or a Target Tee with a flange, infront of the nozzle. This way the fluid flow would be hitting plate or the flange and not the manifold wall. However, it is not possible due to number of nozzles.

This leave me three choices (a) a steel cladded pipe (b) a duplex pipe (c) any other proposal?

Based on captioned explaination, I will be interested in knowing any other option and if clading solution is possible, practical and economical as compared to a full duplex manifold.

By the way GOR is 6100

 

[rzrbk]

Due to cost of 'metalling up' you may want to look at lowering the velocity of the streams going into the manifold. Space permitting, the seven inlets could be swaged up a couple of sizes larger and given, say 5 diameters, of straight run before hitting a larger diameter manifold. This would significantly lower the amount of erosion seen in the manifold, and could be built out of less expensive carbon steel.

Also angled inlets might improve things.

 

[ash9144]

One possibility would be glass reinforced PTFE lined pipe. A little pricey but it does hold up well to erosion.

 

[Khansahib]

rzrbk,
You are very right the cost is one factor which is making it difficult to decide and that is why I approached you people. On your proposal to go for a bigger dia, I could have gone that way but it is offshore facility and space is very limited. I can not even move a line from one lateral to the other.

ash9144.
Can you give me more detail about this PTFE lined pipe. Do you have some experience in using such pipe in service like mine?

 

[MJCronin]

sahib,

In what country are you located and...

Who will be owning this offshore oil platform ?

-MJC

 

[ash9144]

Depending on where you are it should be available from anyone that provides lined pipe and fittings. McJunkin is a possiblity.

I used it in a slurry service in some valves that were stainless and got eroded then upgrade to ptfe and still eroded the glass impregnated ptfe and lasted for years no problems.

 

[STYMIEDPIPER]

I would suggest that you have a maifold fabricated with NASPipe (see the site below).
May set you back a few dollars but will resolve your situation. This will hold up against abrasion more than the PFTE lined pipe

NASPipe

http://www.indutechcanada.com

Canada
PH 1-403-279-2222
Fax 1-403-236-1522