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Rudy Permadi
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ReadmoreHarga terbaru pipa HDPE WAVIN OKtober 2013

Tingkat kebocoran pipa PVC, ductile dan HDPE

Ada tulisan menarik dari  http://www.pepipe.org/ mengenai kebocoran yang ditolerir karena pemakaian pipa PVC dan Ductile. Berikut uraian singkatnya:

 

HOW MUCH WATER IS YOUR CITY LOSING A DAY?

AWWA publishes allowable leakage rates for new pipe installations. AWWA allows PVC to leak at 113 gallons per day, per mile and 125 gallons for ductile iron respectively. Since PE Pipe has fused joints, the allowable leakage rate is ZERO. PVC and ductile iron pipe waste billions of gallons of water across the US every year!


pipa hdpe untuk tambang


Gunakan pipa HDPE agar air tidak terbuang percuma. Beberapa keunggulan pipa HDPE dibandingkan PVC adalah:
  1. Umur yang panjang, HDPE bisa tahan hingga 50 tahun lebih
  2. Aman bagi kesehatan (tidak meninimbulkan kanker) karena bersifat food grade.
  3. HDPE memiliki ketahanan terhadap sinar UV sehingga jauh lebih awet
  4. Tidak menggunakan lem yang berbahaya bagi kesehatan.
  5. Lentur dan mudah dalam pemasangan.
Rudy Permadi
0816 877 518
021 710 76 744
rudy_prmd@yahoo.com

ReadmoreTingkat kebocoran pipa PVC, ductile dan HDPE

Harga pipa PVC

Pipa PVC (POLY VINYL CHLORIDE) sudah sangat dikenal oleh masyarakat kita. Pemakaian sangat meluas kepelosok rumah tangga. Penjualannya pun sangat luar biasa.

Tidak dipungkiri, meskipun telah hadir pipa HDPE yang memiliki keuntungan lebih banyak dari pipa PVC, tapi permintaan terhadap pipa PVC tetap banyak sekali.

Pipa PVC dibagi menjadi 3 macam:
  1. Pipa PVC SNI
  2. Pipa PVC AW
  3. Pipa PVC D
Pipa PVC yang akan kita ulas adalah khusus pipa PVC SNI. Pipa PVC ini diproduksi dengan standard SNI (STANDARD NASIONAL INDONESIA). Jadi karakteristik/spesifikasi nya sudah memenuhi standard. Pipa PVC AW, merupakan pipa PVC yang dijual dipasaran umum. Hal ini sama dengan pipa PVC D. Bedanya adalah pipa PVC AW lebih tebal dari pipa PVC D.

Bagaimana dengan harga pipa PVC SNI ? Berikut kami kutipkan harga pipa PVC SNI:
























Rudy Permadi
rudy_prmd@yahoo.com
0816 877 518, 021 710 76 744


ReadmoreHarga pipa PVC

HDPE vs PVC












HDPE vs PVC

Plastic materials are very elastic and malleable. They can be molded, pressed, or cast into different shapes. They are mostly made from petroleum and natural gas. There are two types of plastics; thermoplastics and thermosetting polymers.

While thermosetting polymers can be melted and molded only once, staying solid once it is cooled, thermoplastics can be melted and molded repeatedly and are therefore recyclable.

Thermoplastics are used in the manufacture of containers, bottles, fuel tanks, folding tables and chairs, sheds, plastic bags, cable insulators, ballistic plates, pool toys, upholstery, clothing, and for piping systems.

There are several types of thermoplastics, and they are classified as amorphous or semi-crystalline. Two of these are PVC (polyvinyl chloride), which is amorphous and HDPE (high density polyethylene) which is semi-crystalline. Both are commodity polymers.

Polyvinyl chloride (PVC) is a cheap and durable vinyl polymer used in construction projects. It is the third most widely used plastic after polyethylene and polypropylene and is widely used in the production of pipes. It has light weight and high strength and is very popular in piping applications both above ground and underground. It is suitable for use in direct burial and trenchless installations because it is very strong.

High density polyethylene (HDPE), on the other hand, is a polyethylene thermoplastic that is made from petroleum. It has higher strength, is harder, and can withstand high temperatures.
HDPE pipes are convenient to use in underground piping because they are found to dampen and absorb shock waves minimizing surges that can affect the system. They also have the best joint pressure resistance and are also more abrasion and heat resistant.

Although both materials are strong and durable, they vary in strength and other aspects. For one, they differ in their pressure capacity for design stress. To achieve the same pressure rating as PVC pipes, HDPE pipe walls must be 2.5 times thicker than PVC pipes.

While both materials are also used in the manufacture of fireworks, HDPE is found to be more suitable and safer to use because it launches fireworks shells to their proper height. And should it fail to be launched and break inside the container, the HDPE container will not shatter with as much force as a PVC container does.

Summary:

  1. Polyvinyl chloride (PVC) is a cheap and durable vinyl polymer used in construction projects while high density polyethylene (HDPE) is a polyethylene thermoplastic that is made from petroleum.
  2. Polyvinyl chloride is the third most widely used plastic while polyethylene of which HDPE is a type is the most widely used plastic.
  3. PVC is amorphous while HDPE is semi-crystalline.
  4. Both are strong and durable, but their strengths vary and they have different applications. PVC is heavier and stronger while HDPE is harder and more abrasion and heat resistant.
  5. HDPE pipes are found to be able to dampen and absorb shock waves minimizing surges that can affect the system while PVC cannot.
  6. HDPE is more suitable for lower pressure installations while PVC is more suitable for direct burial and trenchless installations.
ReadmoreHDPE vs PVC

PVC vs HDPE for water piping
























Hello Chemistry Community!

I basically have to choose which polymer is better for water piping, though there is some chemistry I am not understanding associated with the relations of tacticity, crystallinity and strength of the polymers. (PVC and HDPE)

I did some research, and found that PVC is atactic (or heterotactic) because of the Chlorine units on the backbone (yet it doesn't say why the chlorine makes it like that?). This makes PVC more amorphous making it harder to arrange into layers , making it less crystalline, unlike HPDE (which is very crystalline because it's non branched and syndiotactic).PVC is known for its strength and durability, apparently it's 'Semi-crystalline' and has much more compression strength than HDPE (9500 psi compared to 3500-3700 psi for HDPE). Is it for this reason ? :


HDPE is far more crystalline, since it's linear and syndiotactic, though is it less stronger than PVC because of it only harnessing intermolecular forces within its chains, is this why? And PVC, which has covalent bonds (cross links?) between its chains because of its chlorine, which makes it stronger than HDPE regardless of
how less crystalline it is? I doubt that is why though... I think it may be the molar mass distribution or something along the lines...maybe?

2) I also was wondering if the reason for HDPE's glass transition temperature being 120 to 130 °C (248 to 266 °F) compared to 80°C for PVC, was because HDPE is more crystalline? But aren't PVC's covalent bonds holding chains together? Because apparently glass transition allows 'molecular chains to slide past each other when a force is applied', shouldn't HDPE have a lower Tg temperature than PVC and have its molecules 'slide' easier when it reaches its Tg?


This is really bugging me, I apologize for the rather lengthy question, though help would be much appreciated


Thank you for your time.

dikutip dari: http://www.chemicalforums.com/index.php?topic=51528.0


Salam,

Rudy Permadi
0816 877 518
021 710 76 744
rudy_prmd@yahoo.com
ReadmorePVC vs HDPE for water piping

comparison between PVC and HDPE




















HDPE (High Density Polyethylene) Pipe


HDPE pipe is a primary alternative to PVC (polyvinyl chloride) pipe for all piping applications and is rapidly gaining market share for potable water, sewer, conduit and ducting, DWV (drain, waste and vent,) agriculture, and ground drainage uses. Used since the 1950’s, HDPE has demonstrated its effectiveness through its durability, leak-free performance, corrosion resistance, and ductility. Its greater resilience and flexibility make it less susceptible than PVC to surges, damage from digging, and shifting soils during earthquakes.


HDPE is also preferable to PVC as it is chlorine-free, requires fewer additives in its manufacture, and has a much higher recycling rate than PVC. Commonly referred to as vinyl, PVC is a common plastic used in a wide variety of products such as piping, flooring, wallpaper, window frames, siding, office equipment, children’s toys, and catheters. About 50% of all PVC is used for
piping applications. The worst plastic from an environmental and human health perspective, PVC introduces myriad hazards throughout its lifecycle. The manufacturing of PVC creates dioxin, the most potent carcinogen known, as well as ethylene dichloride and vinyl chloride. These toxins can cause severe health problems including cancer, endocrine disruption, neurological damage,
birth defects, and reproductive and immune system damage.


To learn more about the issues with PVC, see www.buildinggreen.com/features/pvc/pvc.cfm.


PRODUCT COMPARISONS


HDPE Pipe

Chlorine-free
No dioxin produced in manufacture
High abrasion and chemical resistance
Less susceptible to surge shocks
Seamless joint connections
Flexible



PVC Pipe

Contains chlorine
Dioxin produced in manufacture
Moderate abrasion and chemical resistance
More susceptible to surge shocks
Joint seams can leak
Rigid



For a general comparison of various piping materials, see the following EPA factsheet:
www.epa.gov/owmitnet/mtb/pipe_construction.pdf.



LEED CREDITS
Using this material potentially contributes to obtaining these credits in the US Green Building Council’s LEED certification program:


Materials & Resources
MR Credit 4.1 Recycled Content
MR Credit 4.2 Recycled Content

LEED stands for Leadership in Energy and Environmental Design. To find out more about it, visit
www.leedbuilding.org


HDPE (High Density Polyethylene) – Revised 1/9/06 Page 2
ENVIRONMENTAL ATTRIBUTES
Energy Performance
Using recycled HDPE pipe saves energy in the manufacturing process, using less energy than the creation of virgin plastic. Recycling plastic saves significant energy over the creation of new plastic.

Resource Impacts
HDPE pipe has a service life of 100 years and can then theoretically be recycled. Recycled HDPE has minimal impact on the environment since it keeps material out of the waste stream. An estimated 12% of the U.S. solid waste stream is plastic, and 19% of that is HDPE. The resin can be more easily recycled than almost any other plastic. While most recycled plastic markets are specifically tailored to post-consumer bottles, a pipe manufacturer or large end user should be able to find a recycling facility that will accept their HDPE pipe.

Recycling post-consumer PVC is difficult because of its wide range of additives and formulations.It also complicates the recycling of other plastics.


Health Considerations

Although PVC is more resistant to combustion, it smolders at a lower temperature than HDPE and releases toxic hydrochloric gases before combustion. Dioxin is an unavoidable byproduct of PVC manufacture and is a bioaccumulative toxin, building up in fat tissues of living things, and becoming more concentrated as it moves up the food chain. Americans are exposed to high
levels of dioxin, enough for a calculated risk of cancer greater than 1 in 1,000 - thousands of times greater than the usual standard for acceptable risk.


PVC pipe generally requires toxic solvent glues to join sections, whereas HDPE pipe sections are simply melted together. PVC also requires the addition of toxic heavy metal stabilizer organotins (carbon and metal compounds), which have problems with leaching.


For a comprehensive summary on the health and environmental impacts of PVC, read a briefing paper from the Healthy Building Network at:
www.healthybuilding.net/pvc/ThorntonPVCSummary.html


FUNCTIONAL CONSIDERATIONS

Cost

Material prices are comparable to PVC. However, material costs may not be the determining factor in pipe selection. Contractors who have never used HDPE may be resistant to working with an unfamiliar material. HDPE is gaining market share and acceptance through its demonstrated effectiveness in the field. For example, a study conducted by engineers with the Oklahoma Water District found that HDPE would cost less than PVC when considering projected leaks, breaks,
joint failure, and associated water lost over a 15-year period. Also, trenchless installations can dramatically reduce both cost and environmental impact of some underground pipe projects.


Installation

Because HDPE pipe can be delivered in longer lengths, thus requiring a smaller number of joints, it has better leak resistance than PVC pipe. Also, butt fusion joint welding provides stronger, HDPE (High Density Polyethylene) – Revised 1/9/06 Page 3

tighter, more leak proof joints than the bell and spigot or solvent glue joints used for PVC. The longer lengths of HDPE can require that longer trenches are open at one time, although its length and flexibility may allow trenchless installations.
Fusion welding requires a fusion machine for larger diameter pipe, which could be problematic in tight spaces. A handheld device can be used for smaller diameter pipes. Mechanical couplings are available for HDPE, though these couplings are sometimes made of PVC.
Because HDPE has a higher coefficient of thermal expansion than other pipe plastics, aboveground applications will warrant extra care in anchor and support design if the pipe will be subject to significant temperature swings.


Maintenance

HDPE is very durable and should require little maintenance if used in appropriate applications and installed correctly.



Info:
Rudy Permadi
0816 877 518, 021 710 76 744
rudy_prmd@yahoo.com
Readmorecomparison between PVC and HDPE

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