Anther novel method for removing gypsum scale in an alumina plant was as
follows.
The pipe system was replaced in ABS (to AS 3518 by Tyco details at www.eurapipe.com.au) a thermoplastic pipe material. this is manufactured in England, Asutralia, Malaysia and Indonesia. NOT the American stuff that is used for waste, sewers, drains and vents but pressure pipe.
The operator would hit the pipe every morning with a sledge hammer. Hey presto the scale fell off.
Eurapipe have employed ABS in the sugar industry however I am unsure if it was
for the raw sugar lines. certainly temperatures were up at 70 C. Of course at
this temperature such rubber reinforced plastics require continual support. As
ABS expands at 10 imes that of carbon steel you could get the same effect as
you flame treatment by running hot then cold water through the pipes.
--- Ahmed Vawda <avawda@aksugar.co.ae> wrote:
> Hello Pete
>
> Usually, the pipes are in diameters of 3" up to 12", in lengths of upto 20
> feet.
> They are removed from the plant, placed on the ground in a safe place.
> Using diesel fuel blow torch, driven by compressed air, the flames and hot
> gases are directed into the pipe.
> The steel pipe expands and most of the calcium based scale slouches off. The
> stubborn scale that remains in the pipe is hammered to dislodge it. Works
> like a charm.
>
> Regards
> Ahmed Vawda
> Process Engineer
> Al Khaleej Sugar - Dubai
>
>
> -----Original Message-----
> From: Pete Burns [mailto:pete-o@pluto.njcc.com]
> Sent: Thursday, April 04, 2002 5:43 AM
> To: <a href="/group/PipingDesign/post?postID=jhRzYLgY19AeDBBPjGdjGZKKltr_LXSKJV1CZ3umVwdcSHOUe0nkZpRoChA6DNjSPtXLsJiGEsqAbX0H0lVleYJ1nzc">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] Fouling of Pipes
>
>
> Ahmed,
> I am mostly a non-contibuting reader on this forum. I don't have a
> suggestion now, but I am very curious about the "burning " part of your
> calcium scale. If you could elaborate a little about that, I would
> appreciate it.
> Thanks
> Pete
>
>
>
> _____________________________________________________
> Unsubscribe: <a href="/group/PipingDesign/post?postID=QuNKxYRP1sV1S9qdrJqDz1BWuRgfL9EqmzQA5UBaHMzM4k6XgVX4GTMI0dITIvTsTpLm5PGSFEgyGpbs7o1ouVH1pWT8bfapJD4JOKiwnA">PipingDesign-unsubscribe@yahoogroups.com</a>
>
> Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a>
>
>
>
> _____________________________________________________
> Unsubscribe: <a href="/group/PipingDesign/post?postID=QuNKxYRP1sV1S9qdrJqDz1BWuRgfL9EqmzQA5UBaHMzM4k6XgVX4GTMI0dITIvTsTpLm5PGSFEgyGpbs7o1ouVH1pWT8bfapJD4JOKiwnA">PipingDesign-unsubscribe@yahoogroups.com</a>
>
> Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a>
>
>
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:22 EST