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TOPIC: Liquid Slurry Service----care to be taken

7 years 10 months ago #8162

  • AbhijitN
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Liquid slurry piping systems transport solid particles entrained in a liquid carrier.
Water is typically used as a liquid carrier, and solid particles are commonly granular
materials such as sand, fly-ash or coal. Key design considerations involve the nature
of the solid material, it’s particle size and the carrier liquid.

CODE-Slurry Transportation Piping Systems B31.11 - 2002

Piping design for slurry system is different in two important aspects
1-Material of construction of pipes carrying it.
2-Line routing

Let us discuss line routing aspect the liquid slurry service piping system.
Though the particle size is also one of the important point governing below points...let
As far as I know...

- We should avoid fittings / valves or anything in the piping system which can cause contamination of slurry particles in them. Example- SW Fittings,

- 5 D Bends to minimize wear at the turns if used LR elbows.

- No POCKETS in the line.

Any additions to these will be very helpful for all the pipers on pipingdesignes.com

Re: Liquid Slurry Service----care to be taken 7 years 10 months ago #6520

  • WNRF Piper
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Depending on the slurry but we had to put plenty of drains in, generally put them in larger than you would for liquid service.
You do this because if the pump fails or something else halts the flow in the line, you need to be able to fully drain all the line rapidly before the solids settle out and block the line. Aslo plenty of flanges for 2 reasons if the latter happens and to aid in replacement of worn sections.I should add I wouldnt worry about socket welds, the materials you mentioned cross contamination wouldnt be an issue. unlikely that you will have fittings 2" down on slurry lines anyway.

Re: Liquid Slurry Service----care to be taken 7 years 10 months ago #6513

  • Jop
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The last time I did "Slurry" piping we used "Pinch Valves" (http://www.redvalve.com/rv/index.php/co ... ew/67/116/) for shut-off and control. The great thing about this type of valve is there are no pockets to collect or trap the fines in the slurry.
Do it once and Do it Right

Re: Liquid Slurry Service----care to be taken 7 years 10 months ago #6511

  • Anton
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I'm currently working on a mining job with plently of Slurry and tailings lines.

@WNRF,

Good call on plenty of flanges, or better still, Victaulic type connections.

Not just for replacement of worn out sections, but also to disconnect and rod-out quickly, also you also want to allow regular maintanance, including rotating the the pipes to prolong operating life .... Vic type fittings are great for this, and high pressure applications aren't "usually" a concern in slurry applications.

@JOP,
Agreed.
The pinch valves are pretty much essential for this applicaion.
- If you're the smartest person in the room ... you're in the wrong room.

Re: Liquid Slurry Service----care to be taken 7 years 10 months ago #6527

  • 11echo
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I did a "klinker" system on some coal pulverizing equipment, where we were flushing the "other then coal" (klinkers) out of a hopper. We used cast iron piping with 5D wear-back elbows and dresser couplings to connect the fittings. Interestly we also used a mechanical brace at the elbows, because if there was a plug in the line the operator would bump up the pressure in the line to try to clear it out, but could just as easily blown out the fitting. I believe we used knife gate valves ...but that's been afew moons ago!

Re: Liquid Slurry Service----care to be taken 7 years 10 months ago #6531

  • shrivallabha
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The last time I did "Slurry" piping we used "Pinch Valves" (http://www.redvalve.com/rv/index.php/co ... ew/67/116/) for shut-off and control. The great thing about this type of valve is there are no pockets to collect or trap the fines in the slurry.
Do these valves leak (at full closure)?
I am asking this because it will be pressing the soft tube using the sliding metal bars as clamp.

Also, if the slurry contains solids which are abrasive then can they still be used?
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