ImProfil - The Large Plastic Pipe Magazine #17
Pipe Magazine Header
Top-Article 1
Reconstruction of filtrate duct for a WWTP in Russia
Top-Article 2
Krah Pipes App
Powerful tool for take-away
Top-Article 3
KRAH PIPES
One night in Pampanga
See also:
Hydraulic dimensioning of sewage lines
Sewage collection tanks
Sinkholes - a matter of erosion
Visiting a Krah Pipes Producer in Egypt
Sewage and stormwater network for Damietta Furniture City
Krah Pipes installed in exposed conditions
Introducing ... Jeneleen Lansangan
Hydraulic calculation of Polyethylene pressure pipes
Ashkelon Wastewater Project

Laguna Krah Heroes - A Krah Manila Basketball Team
FAQ - Part 3
Informations: Current Market Prices for Commodities in Middle and Eastern Europe
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Alexander KrahYet again I have the pleasure to present another issue of our ImProfil with a few personal lines.  Currently everywhere on this planet money is being “produced” – from nothing. And, more importantly, what is it spent for? For example nice airports like the “oh-so-successful” German airport BER Berlin ready to be opened in 2082? A lot of money is used for visible, high class goods, which reflect wealth.

A good example for this paradoxon is Dubai, a city with a lot of nice, expensive and world-record-breaking buildings. Underground however, the drinking water is still partly being transported through outdated pipelines made of asbestos-cement.

A second trend is going to “Stealth Wealth” – hiding your wealth from the society and investing in the future “underground” and unseen – the right term would be “inconspicuous consumption”. Also countries and communities are doing this kind of investment – they invest in their long-term future. So Krah Pipes are the right product at the right time. We are helping the world by providing a good and sustainable solution for water and wastewater problems – and we enjoy doing this, we don’t produce destructive products! Another new trend is sharing instead of owning, how do we try to face this trend? We try to transfer Know-how at a low price or even for free. Sharing is caring – we will help our customers to grow by on their own – by education. Krah Pipes can proudly present its first App. Enjoy this magazine and if you like to give a feedback, please feel free to contact me at feedback@krah.net.

I would like to point out that there was an error in the last “ImProfil” issue. Our machines are currently running in these Ex-Soviet-Union countries: Russia (Polyplastik Group), Estland (Krah Pipes OÜ), Aserbaidschan (STP) and Ukraine (Instalplast-HV).

We also got some sad news this month. One of our good business partners and friends passed away – Lee Forbes of Kenneth Forbes Holdings Ltd, United Kingdom. Lee founded the company in 1960 together with his Dad Kenneth.  Having worked with plastics his whole life, he decided in 2012 to invest in a Krah Solid One machine, being able to produce plastic tanks and silos. Throughout the Krah Community he was known as very talented and passionate man which also reflected in common projects. Our thoughts are with his family and all those who will miss him as much as we do.

Lee Forbes

Yours sincerely,

Alexander Krah

PS: The Improfil is a non-commercial and free of charge online magazine about large diameter pipe systems. Reports from persons or companies about pipe systems will be published through Improfil and you can unsubscribe anytime without any submitted reason from the list of recipients. For postal subscription please click here.

The online magazine “Improfil” is addressed to people who are interested in the content of large diameter pipe systems and the Krah Group in general.


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CORSYS PLUS pipes used in reconstruction

Rublevskaya water treatment station has been operating since pre-revolution times and still remains the main source of potable water for Moscow, Russia’s largest metropolis. Today there are plenty of new materials and technologies available for water supply and water disposal which can extend pipeline operating life by up to 50 years or more.

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Welding of CORSYS PLUS DN/ID 2000 mm from inside using two welding units.
The pipes are already installed in the renovated conduits.

Implementation is going slowly, which is why the number of worn networks is still significant. The Rublevskaya water treatment station is no exception. Having reached a certain stage of operation, it needed restoration of its filtrate ducts – underground water mains of rectangular and circular cross-sections made of reinforced concrete. Specialists at Mosvodokanal confirmed the option to use circular cross-section plastic pipes in these conduits and ID 1400 mm and 2000 mm were approved for the various sections. They had to choose pipes and fittings for operating pressures up to 0.15 MPa, and find solutions for the following non-standard tasks:

• Installation of pipes, fittings and branching from inside, because opening of water conduits was only planned at places with bends and in chambers
• Connection of the new pipeline to the old one;
• Pressure testing of the new pipeline conducted as for a pressure pipeline.

CORSYS PLUS pipes (pressure version) met all the requirements. These pipes fully comply with GOST R 54475 (used for the production of non-pressure pipes). In addition, they also go through an in-house pressure test similar to GOST 18599-2001 for at least 100 hours at a temperature of 20°C. This allows the use of CORSYS PLUS pipes for pressure systems with operating pressures up to 0.6 MPa. The reliability of the CORSYS PLUS pipes connections is ensured by electrofusion using special electric heaters integrated into the sockets of the pipes. This is the only type of connection that meets the requirements for a new pipeline.

(Read more...)

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Hydraulic dimensioning of sewage lines

Skyline of JakartaSkyline of Jakarta

1. Basis
The development respectively the renovation of waste water discharge system is always associated with high investments and extensive civil engineering works. Beside the purchase costs for the pipelines itself, also high proportionate costs arise for the grounds works and the pipe installation.

Especially in topographical flat Asian metropolitan areas like Jakarta, the pipelines can often only be installed with a low longitudinal slope. Thus, the hydraulic capacity of the pipelines is decisively limited. Increasing the longitudinal slope again means expensive, extensive, technically sophisticated excavation works. In Asia, most sewage and drainage systems are made out of concrete. Those pipes have a very rough pipe wall and have a lot of connections, due to their production process and quality. By using suitable pipe materials that guarantee smooth walls and need much less pipe connections, the longitudinal slope can be reduced while maintaining the dimension and the hydraulic capacity. Thus, also the costs for excavation and civil works can be reduced considerably. Smooth walls also optimize the discharge conditions and especially avoid depositions during dry weather flow.

2. Dimensioning of the pipeline  
The discharge flow condition of open channels respectively free-flow pipelines base on the hydraulic date of Prandtl and Colebrook. The working paper DWA-A110 published by the “Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e.V.” forms the basis for the hydraulic dimensioning and the proof of performance of sewage lines and channels in Germany.

The discharge capacity and behaviour is depending on the hydraulic cross-section, the longitudinal slope, the inflowing water amount as well a roughness respectively the single losses of the pipe system.The dimensioning and the proof can be carried out according to working paper DWA-A110 by means of overall concept or on an individual basis.

Applying the overall concept, the operational roughness of the complete systems will be determined by fixed values of the application. The individual concept should be applied to prove the performance of sewage networks considering all loss-causing influences. In doing so, the losses caused by occurring single losses as well the roughness of the pipe wall are determined. Single losses are caused for example by inaccurate positioning, pipe connections, manholes, flow deflections etc.

(Read more...)

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Sewage collection tank for a leaking sewer system DN/ID 1600mm

Around 100 km from Stockholm you will find Västeras, a large city at Lake Mälaren, the third biggest lake in Sweden. Västeras is a big industrial city that was founded over 1000 years ago. In the past year they had some trouble with leakages in the sewer system. High rainfalls had led to full pipes which resulted in an overflow into Lake Mälaren. 

Krah pipe manhole
Krah Pipes Manhole

Therefore a quick, durable and reliable solution was needed. The engineering company Mälar Energie AB contacted Krah pipes yet again in January 2017 to plan the project for a 950 m³ sewage collection tank of DN/ID 1600 mm with a DN/ID 2000mm manhole. The first pipes were shipped already in October 2017, the project was finished in March this year. The manhole is equipped with a flow regulator 150 l/s from Mosbaek A/S. The incoming flow to the manhole is 350 l/s if the incoming pipe is working with full capacity. The pipes were delivered in lengths of 6 Meter including rubber gasket. In a whole, 41 trucks were needed to deliver the whole amount to the construction site. 

(Read more...)

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Sinkholes – a matter of water erosion!

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Sinkhole in the United States, Source: Nationalgeographics, by Octavio Jones

Anywhere in our world different kind of erosions happen which form our landscape – on the surface as well the subsurface. The most significant factor of erosion is water (beside wind, landslide and abrasion) which is causing a challenge in engineering problem. The ability of water to move soil and rock depends on several factors. The faster and more turbulent the flows of water, the more erosive characteristics are appearing. Larger particles like gravel are more resistant to erosion than small particles like silt or clay. Finally, rather than physical erosion, some materials dissolve in water, just like sugar or salt. It can be eroded just by dissolving into the ground water from time to time.

Some kinds of soil are more affected than others – i.e. dolomite areas, etc. Most natural sinkholes occur in areas with large deposits of carbonate rocks like lime stone. Over long periods of time, ground water flowing through the subsurface can dissolve the rocks, creating voids and open tunnels. In fact, this is how most caves are formed – a creative name of sinkholes is also „Internal erosion“. A sinkhole is a feature that occurs suddenly and manifests as a hole in the ground.

(Read more...)

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Visiting a Krah Pipes Producer in Egypt

Every now and then Krah Group employees visit different Krah Pipes production plants. In April 2018 Alexander Krah went to visit the factory Krah Misr in Egypt.

Having arrived in Cairo he is warmly welcomed by the owners at the airport. The owners and managing directors are the two brothers Peter and George Yussuf Sadek.

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Production line KR750 delivered and installed in 2009

The two brothers have been producing Krah Pipes for almost 10 years. Since the political changes in Egypt during these years, the factory was able to produce and sell large pipe systems successfully.
From the airport the group went straight to the production plant, where in a very modern and big office the two brothers held a company presentation. They showed how the company has been growing since 1975 – it was very impressive and inspirational to see how proud the two brothers were of what they had achieved. The whole production plant is in a very neat and maintained condition and the products (pipes, manholes, fittings and tanks) correspond to the international quality standards. Later this afternoon Alexander had the possibility to talk to Peter privately regarding several topics in a nice club-house.

(Read more...)

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Sewage and stormwater network for Damietta Furniture City

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Overview of "Furniture city"

Damietta Furniture City was established with an authorized capital that reaches 5 billion Egyptian Pounds, with a 521 million Egyptian Pound capital value and a 100% Egyptian capital contribution.

An industrial area built on 331 acres, to establish furniture industries of different size and complementary industries and provide the infrastructure, services and facilities needed by those industries.

1500 small and medium workshops of 50 to 150 meters with about 150 large and complete factories, besides the establishment of the furniture technology centre in Damietta.

(Read more...)

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Krah pipes installed in exposed conditions

Krah pipes, made of Polyethylene PE100 in typical black colour, provide a perfect weather and UV resistance. If a Polyethylene pipeline is planned for an application in exposed conditions the external loads and influences have to be considered for the design.

Typical applications are:
• Mining industry
• Sewage and water pipelines
• Hydropower plants (headrace, penstock)
• Industrial applications

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Krah pressure pipe with clamps and concrete fix points for hydropower plant

For exposed installations we mainly differ between industrial pipelines installed in clamps and free installed pipelines on the ground. In the following abstract we concentrate on free installed pipelines under exposed conditions. Often we receive inquiries regarding the planning of Polyethylene pipes for such exposed conditions. People ask for installation rules and what has to be considered in general.

(Read more...)

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Introducing ... Jeneleen Lansangan, Krah Pipes Manila Inc.

Krah Pipes Manila, Inc. (KPMI) is one of the latest extension and additional part of Krah community in South - East Asia, particularly in the country with 7,107 islands and known as the pearl of the orient, the Philippines.

KPMI was listed in the Philippine’s directory of corporations last September 2015 and opened its plant doors last May 2017. In between those years, the first ever employee of Krah Pipes Manila joined the team. KPMI’s first employee is Miss Jeneleen Lansangan, we like to call her Jen. At the age of 25, she joined KPMI as Mr. Alexander Krah’s executive assistant in April 2016. She graduated and passed the local licensure exam for Civil Engineering and was able to help out in the supervision of KPMI’s plant construction which started in October 2015.

She was able to attend various trainings from the very generous and technically equipped seniors from KHB. She was able to train the basics of Krah product and technology from our very own Mr. Alexander Krah, Mr. Jochen Blickheuser and even with Mr. Stephan Füllgrabe.

As the plant operation started during late June 2017, she was assigned to the technical and sales department. Since the KPMI team started, most of the functions were carried out by Mr. Sajid Anonuevo, the president, Mr. Nobu Kotake, Ms. Sheryll and Jen. She was exposed to procurement of raw materials, PE-HD, and communication to suppliers like Borouge Ltd. and SCG.

(Read more...)

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Ms Jeneleen Lansangan at work

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KRAH PIPES - One night in Pampanga

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The Krah team installing the pipeline

Krah Pipes Manila, Inc. has again made a landmark accomplishment in the installation of a DN/ID 1500mm diameter pipe for its client, SM Telabastagan, Pampanga.

The project which Krah Pipes Manila Inc was able to forge is basically a 24 meter distance of cross drain pipes which ran across a major road, MacArthur Highway considered a very busy road within Fernando City, Pampanga. The 24-meter distance or length is practically 4 pieces of 1500mm diameter Krah Pipes. It was a quick overnight process of installation where the excavation of the trench took only 4 hours and 3 hours for the jointing of 4 pieces of pipes (at 6 meters in length per pipe) and laying them down the trench after which the excavated area was immediately back filled making the road ready for the passage of the various vehicles and motorists the following day. The works conducted did not cause disruption and inconvenience to the public.

(Read more...)

 

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Hydraulic calculation of Polyethylene pressure pipes

Krah pipes are often used for pressure applications, whether the requested pipe material is a standard High Density Polyethylene (HDPE) or Polyethylene reinforced with glass fibres (PE-GF). For the flow-characteristic and pressure loss the surface quality is essential, since the surface-roughness affects the friction between fluid and pipe wall. Polyethylene pipes (HDPE and PE-GF) provide in general very low roughness values in comparison to steel or concrete pipes. The low roughness and the kind of waxy surface can also avoid incrustations which is another point to reduce the pressure-loss.

Furthermore also the jointing procedure can be important. Any interruption of the surface generates additional turbulences, which increase the pressure loss. In the pipe design that aspect should be considered. A smooth surface after jointing is very preferable, e.g. by using Electrofusion socket / spigot joints.

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(Read more...)

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Ashkelon Wastewater Pipeline Project

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Engineer Mr. David Yaloz at construction site

Israel is known as the land of the Bible, but it is actually much more than that. Israel is a modern, developed country located along the Mediterranean Sea.

Due to the long, hot and dry summers with very short rainy winters, water becomes one of the most important issues in the country. Therefore, as one of the most arid environments on earth, the available water system has to be handled and developed very carefully.

On this basis, the Water Authority approached the engineer Mr. David Yaloz with the task of finding the most suitable piping system to enlarge and replace an existing wastewater system in the town of Ashkelon. The existing pipeline is constructed from a 48” asbestos cement pipe. The new 3.6 km pipeline will replace the existing pipe and a further 3.6 km pipe will be laid after the existing pipe is decommissioned to provide additional capacity and flexibility for this expanding town. The Israeli pipe market offers many different pipe materials i.e concrete, HDPE, PP, steel, and PVC etc. for a sewer pipeline project like this.

(Read more...)

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Laguna Krah Heroes - A Krah Manila Basketball Team

Laguna Krah Hereos, is new expansion team that recently joined the Maharlika Pilipinas Basketball League. Laguna Krah Heroes is team formed for Laguna province with Biñan City as the LGU Partner spearheaded by the most sports enthusiast, Vice Mayor Gel Alonte of Biñan City in Laguna.

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The Maharlika Pilipinas Basketball League (MPBL)  is a regional men‘s professional basketball league in the Philippines.   It is founded by no other than the World Boxing Champion, now a senator in the Philippines, Senator Manny Pacquiao.  The  League was founded in August 29, 2107 and started  the founding league with Bulacan Kuyas Team emerging as the Champion last year. 

(Read more...)

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The Krah Pipes App - Powerful tool for take-away

To improve the know-how transfer from us to our customer we choose the way of a free app, so after half a year of further developments, we are proud to present our latest improved Krah-Pipe Calculation App. The app can run without an internet connection, so you are free to use it nearly everywhere.

A small tool, but a lot of functions:

1. The first main part of the App is handling the field of hydraulic calculations:

• This feature enables you to calculate the flow speed and flow rate (according to ATV A110) just by entering your diameter, slope and filling height and rather choose your Kinetic viscosity and working roughness from a list ore entry a free chosen value.
• If you already got a flow rate and a filling height but need a diameter you can calculate this by tapping on “FIND THE RIGHT DN/ID” on the tab bar on the top of the page.
• Last but not least you can even calculate the right slope for your flow rate, diameter and filling height.

2. The second part is handling the field of “Storm water retention”:

• This feature is made for dimensioning storm water retention regarding to diameter, length and volume at different filling heights.
• On the “REQUIRED VOLUME” tab you are able to enter the volume you need and you will get a table with diameters between 300 mm and 2000 mm and 3 different filling heights showing you which length you will need.
• On the “AVILABLE LENGTH” tab you are able to enter your given length to calculate a table with diameters from 300 mm to 2000 mm and 3 different filling heights (full filling, 2/3 filling and 7/8 filling) showing you what volume you will need.

(Read more...)

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Quick structural calculation

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FAQ - Part 3

Can Krah pipes be used for outfall and intake pipelines?
Yes, Krah pipes are 100% applicable for marine applications and have a multitude of successfully reference projects worldwide. Both Krah profiled wall pipes and Krah solid wall pipes can be used for outfall and intake pipelines. However, the profiled wall in combination with the Krah Electrofusion technology is mostly used.Notice: The Krah marine pipe profile provides a higher stiffness and buckling stability than normal solid walls. And also an axial strength is excellently given by using this special Krah profile!

How is the chemical resistance of Krah pipes against acid and lyes?
Krah pipes and Polyethylene products in general have been successfully used for decades in the chemical industry for transport of chemicals as well as for storage tanks. Notice: Polyethylene has a very good chemical resistance against most of acids and lyes!

Will Krah pipes float in the water?
Yes, Krah pipes are made of Polyethylene and Polypropylene, and due to being slightly less dense than water, they will float even when they are full of water.
For underwater anchored pipeline installations, it is important to specify the proper weights and distance of the weights. Whenever possible, an underwater pipeline should be installed in a trench with a protective crushed rock cover.
Notice: Krah can support you with designing marine pipes!

What is the maximum recommended flow velocity for possible fluids going through Krah pipes?
In a pumped system the maximum operating velocity is limited by the surge pressure capacity of the Krah pipe. If surge is not a consideration, water flow velocities exceeding 7,5 meter per second may be acceptable. This number can also be used as a maximum for gravity applications.

Will sunlight adversely affect Krah pipes?
Sunlight is not a concern if black PEHD material is used.Carbon black, utilized for black compounds, is the most effective ultraviolet stabilizer. Therefore, black is the recommended pipe colour for an exposed long-term service or storage. Krah pipes, made of a black PE pipe compound will provide decades of outdoor use!

Some applications require explosion protection, especially in explosive gas atmosphere – how can Krah pipes avoid a static charge?
Krah pipes can be made of electrical conductive Polyethylene for an anti-static behaviour. Mostly it is sufficient to produce the coextruded inner or outer layer with electrical conductive Polyethylene!

Are Krah pipes applicable for ...

(Read more...)

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Krah Pipes

Krah Pipes GmbH & Co.KG
Betzdorfer Straße 8
57520 Schutzbach
www.krah-pipes.de