Krah Community - ImProfil Magazine #11
head
Article 1
Testing of HDPE-Manholes for fire hazard
Ministry of Works - Bahrain
Article 2
HENZE Double-Wall-Tanks
with integrated tank-heating
Article 3
A new and innovative solution - house connections for large spiral-wound Pipes
HE-HAS-160/225
See also: Sewage Pressure Pipes for Northern Argentinean Provinces
Polyethylene Pipes and Manholes for Landfill-Applications
Stock management of agricultural pipeline in Japan
Now Proven: 100 Years Life Expectancy for polyolefin sewer pipes
Coming soon: ProfiTank - New Design Software for thermoplastic tanks
Informations: Current Market Prices for Commodities in Middle and Eastern Europe
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Dear Reader,

Time is running again so fast and already half of 2015 has nearly past, an important year for large pipe diameter systems in Europe.
The raw material situation is very difficult, no material is available and only to very high prices – thanks to the nice and funny explanations of „force major“ given by the main raw material suppliers.

Another news is that the German company "Bauku" got a new main owner, the company "Hawle" . The other large pipe producer in Germany "HENZE GmbH" also got a new main shareholder "KHB GmbH", and beside the general manager Wolfgang Fester, Alexander Krah is now also appointed as a general manager of HENZE GmbH.
KHB GmbH is also a main shareholder of Krah GmbH. So the consolidation of the large plastic pipe market is going on quickly.

The Krah Community will join its forces with the large diameter pipe producers to have a sustainable and successful future.

Also, our long term project, will be finished super soon: "The Handbook on large plastic pipes" – we will go into print by the end of July 2015. The distribution can start in August.So do not lose time and order your copy online.

Best wishes from Westerwald,

Alexander Krah


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Testing of HDPE-Manholes for fire hazard
Ministry of works - Bahrain

Introduction:

Manholes made of Polyethylene have been used successfully for more than 40 years Worldwide. It is a growing market and the advantages of manholes made of thermoplastic materials are well known:

  • No leakages
  • Easy handling
  • Low weight
  • Durability > 50 years
  • Impact resistance
  • Flexibility
  • High Strength
  • Tailor-made design for any load case
  • Easily Fabricated – important for future connections
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In this case, the Ministry of Works – Bahrain had reservations concerning the possible flammability of the HDPE manholes during and after installation. These reservations had to be answered clearly and without any remaining doubt!


(Read more...)

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HENZE Double-Wall-Tanks with integrated tank-heating

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HENZE is one of the market-leading manufacturer of large diameter plastic pipes. The pipes, made out of Polyethylene or Polypropylene are used for applications in water- and sewage systems and as industrial application as well. The spiral wound pipes can be produced either with a solid or profiled wall as structured pipes.

Especially the double wall structures enables HENZE to provide a high quality and security standard for industrial applications and interesting solutions for process-engineering (double wall tanks, heat- exchanger etc.)

The following brief-report shows the special application of storage- and treatment tanks, made of Polypropylene, for a bitumen-emulsion in road constructing.

The storing and maintained suspension of a bitumen-emulsion for further production steps depends largely on whether the temperature of approximately 70 degree Celsius can be constantly held inside the storage tanks. Additionally to the fine distribution of bitumen in the watery liquid, emulsifiers stabilize the temperature inside the mixture. In case the temperature drops below a certain degree, the emulsion is broken and the bitumen will fall out and become sticky. Therefore, the constant temperature is of major importance.

Since thermal discharge arises in terms of hot water during the production, it stands to reason to use this for the intended purpose. Thanks to the know-how in process engineering and design of plastic pipes a constant temperature, proper storage as such as an adequate treatment could be achieved.

The double-walled construction allows beside its usual purpose (the storage of media) also a leakage test. The test can be carried out via electric resistance measurement using probes to detect over- or under pressure. The spirally wound profiles inside the pipe wall can additionally be used for cooling of process media. However, in this specific case the storage medium (bitumen-emulsion) was heated up by passing a heat-medium through the profiles. Thus, the heating-water (thermal discharge from production) was pumped into the spiral profile of the double-walled wounded pipes of the vertically tanks.

(Read more...)

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A new and innovative solution - house connections for large spiral-wound Pipes
HE-HAS-160/225

The Krah Community Member Henze GmbH offers his patented House Connection Solution HAS-160/225 to all Krah Community Members (Patent No. DE 102005051560B4) and to all large plastic pipe users (PE and PP pipe systems).

Finally, a quick, secure and cost effective solution for house connections of large plastics pipes is available. The complete installation of the HE-HAS will be done from outside, so the installation can be done under operating conditions. No manual „hand-extrusion welding“ is anymore required, but a special heating element fusion system is used, according to DVS2207.

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The HE-HAS house connection is available in two connection sizes: DN160-SDR17,6 and DA 225-SDR17,6. So other pipe materials, like PVC, PP can be jointed easy. The HE-HAS house connection can be done on solid wall pipes, according to DIN8074/75, DN/EN 12666, DIN16961, EN13476, ASTM F894, NBR7373 and PAS...

(Read more...)

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Sewage Pressure Pipes For Northern Argentinean Provinces

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Project Description

Under the program for the Development of Northern Argentinean Provinces: Infrastructure Water and Sanitation, financed by the Interamerican Development Bank, the Program Execution Unit conducted the bidding process and award of the International Public Tender No. 01/13 for project: Streamlining of Pumping Plant Drive and Effluent Treatment Station - Santiago del Estero whose bid is on 27 November 2013. On held January 13, 2014, the InterAmerican Development Bank (BID) reported no objection to the recommendation for award of contract.

This integrated urban sanitation project involves the expansion of sewage lying over the construction of a sewage liquids treatment plant. It provides for expanding the number of new connections in 14,493 units, which would add to the existing 30,560 units. The length of the extension needed to achieve network is estimated at 425.9 km.

The new pipeline will run from the station EB1 by Dr. Degano, Independencia, Av. Dr. Victor Alcorta heading south to the main drainage canal south street that runs through Los Lapachos. From there change direction by 90°, to take on the left side to its in the Viano channel mouth to cross it and continue along the left side of channel until turn at 90° to go to inlet of future treatment plant.

This is a line 4250 meters of pipes that will be subjected to a maximum pressure of 3 kg/cm², for which the use of a hydraulic line of 1100 mm inner diameter and 6 kg/cm² nominal design pressure was determined.

(Read more...)

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Polyethylene Pipes and Manholes for Landfill-Applications

General:

The control of gas and fluids in landfill application requires safe and applicable pipe-systems.
Due to environmental risks, the requirements for the raw-material and all finish and semi-finish products are much higher than for standard sewer applications. Also for welding and fabrication the quality-requirements are significantly higher. Special local approvals for raw-material, product, producer, welders and fabricators are often needed to simply enter the market.

For more than 30 years High Density Polyethylene (PEHD) has been successfully used in landfill-applications. Especially the modern bimodal types of PEHD are the perfect material for the challenges we face in landfills and in contact with hazardous fluids and gases.

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The excellent chemical resistance of polyethylene against a multitude of acids, lyes and organic hydrocarbons is a strong argument for using Polyethylene in Landfills.

Also very important are the mechanical characteristics and the durability. Today we have been using Polyethylene successfully in the pipe-industry for more than 55 years and tests have shown clearly, that we can consider a life service time of more than 100 years. The long-term-hydrostatic pressure curves (pic. 1) provide the basis for the stress-related design. The reliable strength depends on the temperature and the stress-loaded time. In terms of strain and stiffness the creep-modulus, the flexibility and the behavior against Slow-Crack-Growth (SCG) has to be considered.

Landfills are planned for generations of human life. To guaranty a maximum of safety for our environment and thus our all health, Polyethylene serves as the most convenient solution and should be used.

(Read more...)

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Stock management of agricultural pipeline in Japan

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1. Background

All over Japan we have huge agricultural fields to cultivate rice, vegetables, fruits and other crops. Major parts of the pipeline project were developed between 1968 and 1985 by the National development project. Since then over a century passed and the infrastructure became too old. Major problems of our pipelines are leakages, cracks, collapses and corrosion. This is not only harmful to the agricultural facilities but also to the farmer’s property. For the stock management of agricultural pipelines, both human capacity and financial capacity is used.

2. Current situation

Next to the agricultural pipelines for farmers, tunnels, pipeline siphon systems by Fiber reinforced plastics mortal, steel pipes, ductile irons and concrete pipes exist in Japan.

Leakage problems occurred in PC pipes, steel pipes and fiber reinforced plastics mortal pipes. The map shows at which part of the pipe the accident exactly happened. According to an investigation report by Mie prefecture, there were 51 accident-cases on pipelines until 2012. In particular within 5 years, they had a total of 25 accidents; a further accumulation of similar incidents can be expected.

Furthermore, in 1994, 2001 and 2009 leakages even led to an outage of water supply for a longer time and thus affected human activity tremendously.

From 2003 to 2011 a governmental research team investigated the given conditions of the main pipelines intensively by evaluating the concrete, neutralization tests, measurement of joint defection, EMF measurement, non-distractive inspection and drilling investigations. The result showed corrosion, abrasion and crack propagation due to degradation over time.

(Read more...)

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Now proven: 100 years life expectancy for polyolefin sewer pipes

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'Polyolefin sewer pipe systems have a service lifetime expectancy of at least 100 years.' This is the conclusion of a recent two-year project commissioned by TEPPFA and independently scrutinised by Professor Heinz Dragaun from the Technical School for higher education (TGM) in Vienna. The project involved the excavation of many samples from in-service pipe networks that were tested and assessed under meticulous laboratory conditions. The results of the analysis and findings of this work are expected to favourably influence those sewer operators faced with major capital investment in new or replacement networks.

Most European countries have their fair share of antiquated sewer networks.They not only leak and lack performance, they also need to be modernized or just replaced. But life expectancy is a critical factor in any investment decision. Polyolefin (polypropylene and polyethylene) systems have been used widely for over 40 years and compared to non-plastic pipe materials, they have consistently offered a longer term solution. However, whereas the life expectancy of polyolefin pipes has been discussed for many years, a definitive conclusion has never been determined. Until now, that is.

(Read more...)

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PlaspiTec


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