Topik ini kerapkali ditanyakan oleh beberapa rekan..... perlukan kita membuang bead hasil join secara butt fusion pada pipa HDPE ?
Berikut adalah kawabannya:
JimPerrault
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Post subject:
Posted: August 16th, 2006, 3:18 pm
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Joined: August 16th, 2006, 9:51 am
Posts: 32
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The previous writer makes some good points. However, don't let this line of thinking scare you away from polyethylene as your system of choice because you feel you have to remove the internal bead. The writer admits, "flow reduction is virtually nonexistent." Lets look at the applications where bead removal in NOT needed:
- City and Rural Water Distribution Systems: The advantages of switching from a material such as cast iron or PVC to polyethylene far outweigh the "virtually nonexistent" flow restrictions of an internal bead. A complete list of the advantages would be a topic for another post.
- Natural gas distribution systems: For decades polyethylene has been the material of choice for natural gas distribution. The internal bead has never been an issue.
- Waste Water and Sewer: Polyethylene provides such a low friction factor, that even with the internal bead, flow is improved over concrete, cast iron and PVC.
- Mining and Industrial: In these tough applications, polyethylene is the preferred material over steel in many cases. Internally beaded polyethylene, with its excellent resistance to wear and abrasion, can out last steel several times, even with high abrasive slurries. In these applications, polyethylene's erosion/corrosion performance is unaffected by the bead.
- Conduit and Telecommunications: The issue of an internal bead in minimal in these applications. Most all commercially designed pigs can easily pass the internal bead. Once the cable is installed the bead has no effect. This industry simply prefers mechanical fittings in small sizes. This preference is largely due to the lack of knowledge about superior joining methods such as butt fusion, and not the lack of internal debeaders.
As an engineer, I disagree with the previous writer's comment that the internal bead should be removed if for no other reason than efficiency. If the time and cost of removing a bead far outweighs the increase in performance over the life of the system, the bead should be left in place. Keep in mind that polyethylene has the advantage of being coiled in sizes up to 6" IPS. These coils range in length from 500 to several thousand feet. Even the previous writer's products (which can be found at www.beadtrimmer.com ) cannot remove beads hundreds of feet down a small diameter pipe. In some special cases, it may be advantageous to remove the internal bead (and I’m sure he’d love to sell you a tool to remove them). But in most applications it simply is not necessary.
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| BEAD PADA BUTT FUSION JOIN PIPA HDPE |
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