piping class for carbon steel rubber line

[rudiawan .]

friends..
i need the piping class for carbon steel rubber lining
this specification is for pumping sea water to the smelter plant
appreciate if can share this piping specification class


regards
rudiawan

 

[LittleInch]

How on earth do you expect anyone to answer this question? Really? Based on no information supplied whatsoever?

Look on the drawings or look at the flange itself - usually stamped on it, or just take some dimensions and see if they match, so OD, number and size of bolts and thickness of the flange.

Piping class is different from a piping specification which is something the designer puts together and should be in your data book for the plant.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Latexman]

Use the piping class needed by the pressure of your application. The function of rubber lining is solely corrosion protection.

Good Luck,
Latexman

 

[mk3223]

May google a piping specification reference for the CS pipe rubber lined piping material or consult a local engineering company to develop a proper piping specification for your sea water application.

 

[LittleInch]

If this is for a new line, personally I would not rely on an internal coating to prevent corrosion when transpiring raw seawater.

You need Aluminium Bronze or a plastic pipe like PE.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Snickster]

Here is an old speciication for rubber lined carbon steel pipe. I would think that you could use other materials such as ductile iron. etc.

 

[rudiawan .]

thanks snickster for your piping spec..
could you inform how about fitting such as weldolet, threadolet or other branch fitting for small pipe and using the rubber line spec..

 

[LittleInch]

When you're using an internally lined pipe, branch fittings are generally not allowed due to the difficulty of sealing around the hole.

I think the pipe listed was actually made up of many flanged sections where the rubber was factory installed including around the flanges.
If you want a branch fitting then you will need to use a spool piece of Duplex or aluminium bronze connected to the rubber lined pipe.

Lining any pipe with rubber or FBE or similar carries a substantial risk of failure due to holes or damage to the lining.
For seawater it rarely works more than a few years. Lined carbon steel pipe is a poor choice for this duty IMHO. Use PE, FBE, Aluminium bronze or Duplex.

Or be prepared to be constantly fixing leaks after year 3.... or earlier. Seawater is very corrosive to Carbon steel and not great for normal stl Stl either.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Snickster]

Looks like some branch connections were permitted in that spec I posted. It was very long ago so I forgot how they were handled by the lining application but the liner thickness table shows liner down to 1 1/2". I would check with a liner applicator and discuss with them as to what they can or cannot line.

 

[LittleInch]

If you build it first then line it you might get away with it, but not post lining and there might be a minimum size to coat.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[georgeverghese]

Think the Plant Owner may regret using rubber lined CS in this application, with the rubber lining peeling apart from the pipe walls. For clean seawater, you should be using Monel or AL6XN (or some other similar material with high PREN). Make provisions to prevent sand entrainment that will otherwise erode the corrosion resistant oxide layer on the pipe wall surface.