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produced with krah pipe production technology news general about us application advantages jointing technologies videos downloads krah machines the pipe magazine this website uses cookies. if you continue to use the website, you agree to the use of cookies. this website uses cookies. if you continue to use the website, you agree to the use of cookies. learn more i understand general co-extrusion co-extrusion if requested all pipes can be manufactured either with a bright, inspection friendly or an electro-conductive inner surface made by the co-extrusion process. the co-extrusion provides an inspection- friendly, bright inner surface and at the same time a long term uv-resistant outer surface (for example for the storage of pipes outside for a long time). diameter diameter krah pipes can be produced steplessly at intervals of 100mm with internal diameters (id) ranging from dn/id 300mm to dn/id 5000mm. the nominal diameters (dn) coincident with the internal diameter (id) of the pipe, because in case of any change in the design of the pipe the wall thickness can be increased or reduced while the internal diameter remains the same. flexibility/deformation flexibility/deformation elastic pipes can react to changes in their environment. due to the deformation performance, the load is distributed to its surroundings and the force acting on the pipe will be diminished. within a short time there is a balance in the area around the pipeline and the deformation comes to a standstill. plastic pipes react very flexibly to static loads, while the loads do not concentrate themselves on the pipe, but are diverted to the surrounding soil. flexible pipes still work when other rigid pipe systems already show damages like breaks or cracks. even in the case of a deformation the system is still absolutely resistant against infiltration and exfiltration. since the pipes are profiled on the outside, these profiles can protect the pipes in the soil a bit. there will be almost no axial extensions in the pipeline. krah pipes are nearly unaffected by temperature variations. deformation resistance pipes made of polyethylene and polypropylene have considerable advantages to other pipe materials like concrete, steel, ductile etc. due to their material the krah pipes come with a high elongation at break. the krah pipes deform conformly with the movement of the earth without any breaks or cracks, so that the activity of the pipeline is not drastically affected. as soon as the overload and earth movement ends, the pipe will go back to its initial condition and position. another advantage is the high flexibility. even in areas which are highly affected by earthquakes, our pipes are hardly damaged in comparison to pipes made of other materials. despite the flexibility of the krah pipes they have a great capacity to carry loads, so that they are also suitable for road construction. hydraulics hydraulics due to the smooth anti-adhesive inner pipe surface the inner diameter and hydraulic properties of krah pipes will remain constant regardless of the wall thickness or the profiles . the nominal diameter (e.g. dn/id 500) corresponds to the respective inner diameter according to din 16961. compared to other pipe materials like concrete smaller diameters can be used, which means that costs for material and installation can be reduced significantly. click to enlarge internal pressure internal pressure the krah pipe system can withstand low working pressure up to 3 bar, depending on the thickness of the waterway wall (e4,e5). equivalent to din8074 the hoop stress formula can be used with minimum (e4,e5) as the minimum wall thickness of the a1 pipe, or the minimum wall thickness of the waterway for a2 pipes. e = minimum wall thickness p = internal pressure di = internal diameter σ = permitted strength (mrs/c) mrs = minimum required strength c= safety factor (for water 1,25) length length the standard laying length (l) of the krah pipes is six meters, because in this way they are easy to handle, store and transport. in addition it is possible to continuously produce any length between one and six meters. the longer a pipe is the fewer joints are necessary and this is advantageous for the pipe installation. moreover it is possible to deliver the pipes already jointed, whereat the installation time on site can be reduced significantly. lifetime lifetime the lifetime of the complete krah pipe system for gravity and low pressure application is 100 years. basically every component is designed for a 50 year full and constant load case. in the upper shown diagram you can see that the stability of the pipes are designed for a usage of 100 years (a), including a calculated safety margin. a stability (b) is reached - with constant load, in our case due to the usage of polyolefins we have an additional safety. as soon as the load is released the time is starting again, and you have the extra safety again. click to enlarge material material polyethylene (pe80 and pe100) and polypropylene are thermoplastics with excellent properties for the application with water and sewer, as well as for the fabrication of containers for liquids and solid materials. the environmentally friendly plastics polyethylene and polypropylene are resistant against many chemicals and are very suitable for conveying and storing various liquids. krah pipes can be made from the following thermoplastic materials: high density polyethylene (pe80 and pe100) polyethylene with caco3 pp high stiff (ppb-hm) polypropylene-random (pp-r) polypropylene-homo (pp-h) polypropylene-none-flammable (pp-s) these materials feature the properties mentioned in the table on the right side. other material can be used after prior acceptance of the producer and a third party for quality control. however, the processed material should have the specifications listed in the table below. click to enlarge wall thicknesses wall thicknesses both profiled and solid wall pipes with wall thicknesses of up to 300mm can be produced. the quality of the pipe is highly dependent on the quality of the waterway wall, therefore all krah pipes are usually produced with a minimum waterway wall of 4mm. click to enlarge click to enlarge click to enlarge standards standards the krah pipe system is designed to meet the requirements of present applicable international norms and standards. the krah pipes gmbh & co. kg is member of the major standardization committees to guarantee that the pipes are corresponding to the standards, but also that the standards are corresponding to the pipes. the krah pipe corresponds to the following international standards: click to enlarge stiffness stiffness according to different norms and standards, the pipes shall be designed according to nominal ring stiffness classes (sn) like sn2 (only for pipes dn > 500), sn4, sn8 or sn16 (according to iso 9969), or other standard stiffness classes (din16961, astm f894, nbr 7373 etc) not depending on the testing method (constant speed or constant load). in addition, according to en13476-3 (9.1), the manufacturer is also allowed to produce pipes dn/id > 500mm in between the sn classes, in case he is able to prove and underline this decision with the help of a static calculation. according to cen/ts 15223, piping systems of stiffness classes ≥ sn 4 ,designed to be used underground, are sufficiently resistant to external water pressure. more stringent requirements with regard to external water pressure can be checked in diagram 2 as a function of the ring stiffness of the pipe. click to enlarge imprint / contact

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Whois Information

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Domain Name: krah-pipes.com
Registry Domain ID: 15584405
Registrar Whois Server: whois.cronon.net
Registrar URL: http://www.cronon.net
Updated Date: 2014-11-11T00:00:00Z
Creation Date: 2014-11-11T00:00:00Z
Registrar Registration Expiration Date: 2017-06-16T00:00:00Z
Registrar: Cronon AG
Registrar IANA ID: 141
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +49.303001460
Reseller:
Domain Status: ok https://icann.org/epp#ok
Registry Registrant ID:
Registrant Name: KHB GmbH
Registrant Organization:
Registrant Street: Alexander Krah
Registrant Street: In der Schneisenbach 45
Registrant City: Daaden
Registrant State/Province:
Registrant Postal Code: 57567
Registrant Country: DE
Registrant Phone: +49.2741932310
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: [email protected]
Registry Admin ID:
Admin Name: KHB GmbH
Admin Organization:
Admin Street: Alexander Krah
Admin Street: In der Schneisenbach 45
Admin City: Daaden
Admin State/Province:
Admin Postal Code: 57567
Admin Country: DE
Admin Phone: +49.2741932310
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: [email protected]
Registry Tech ID:
Tech Name: Hostmaster Strato Rechenzentrum
Tech Organization:
Tech Street: Cronon AG Professional IT-Services
Tech Street: Emmy-Noether-Str. 10
Tech City: Karlsruhe
Tech State/Province:
Tech Postal Code: 76131
Tech Country: DE
Tech Phone: +49.72166320305
Tech Phone Ext:
Tech Fax: +49.72166320303
Tech Fax Ext:
Tech Email: [email protected]
Name Server: shades03.rzone.de
Name Server: docks09.rzone.de
DNSSEC:
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2017-06-13T22:03:48Z <<<
For more information on Whois status codes, please visit https://www.icann.org/epp


  REGISTRAR CRONON AG

  REFERRER http://www.cronon.net

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =krah-pipes.com

  PORT 43

  SERVER whois.cronon.net

  ARGS krah-pipes.com

  PORT 43

  TYPE domain

DOMAIN

  NAME krah-pipes.com

NSERVER

  DOCKS09.RZONE.DE 81.169.146.19

  SHADES03.RZONE.DE 85.214.0.233

STATUS
ok https://icann.org/epp#ok

  CHANGED 2016-11-12

  CREATED 2014-06-16

  EXPIRES 2017-06-16

  REGISTERED yes

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