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FAQs -- Fequently Asked Questions
1 What are the advantages of using PE pipes & fittings over Metal pipes?
 
There are so many advantages of PE pipe over conventional metal pipes, some of them are Long lengths without joints,No corrosion protection,PE Pipe is flexible,Shallow & narrow trenching,No special corrosion protection, Long radius bending of pipe,lighter than Metal.
 
2 what is the life expectancy of HDPE pipe in Gas & water industry applications?
 
Many installations of PE pipe in Gas & water applications are already reaching 50 years of successful service. The polyethylene pipe industry estimates a service life for PE pipe to conservatively be 50-100 years. This relates to savings in replacement costs for generations to come.
 
3 What does the term SDR mean?
 
A Standard Dimension Ratio (SDR) is the average outside diameter divided by the minimum wall thickness. SDRis a based on ANSI preferred number series. The use of SDR’s enables manufacturers to produce pipe and fitting to a set of standardized DR’s. Mainly SDR’s include 9, 11, 13.5, 17, 21, 26, and 32.5.
 
4 Where can I findengineering practices such as the Procedure, Precautions for Electrofusion Welding for Fittings with PE pipes?
 
Engineering practices for Electrofusion welding of PE pipes is described in Kimplas Installation Manual. Also Details Procedure can be followed From National Grid Transco instructions, various Standard Installation Procedures.
 
5 Can PE pipe be joined by solvent coupling joints?
 
No. At this time, there are no known adhesives or solvent cements that are suitable for pressure sealing or that have sufficient strength characteristics to join PE pipes.
 
6 How PE pipe segments joined or connected?
 
PE pipe is easily and dependablyjoined using the standardized butt-fusion, Electrofusion, Saddle Fusion, Mechanical Jointing Procedures.
>> In Butt Fusion process matching ends of the pipes to bejoined are aligned and heated with standard tools until the surfaces have become molten. Whenengaged under moderate pressure, the melt faces flow together forming homogeneous joint. In Butt Fusion jointing of Pipes of different wall thickness is not possible.
   
>> In Electrofusion Process Pipes of different thickness are clamped after surface preparation, Electrical Energy is Passed through embedded coils using Fusion Machine, Heat generated by Coils melt both Pipe & Fittings Surface forming a monolithic, homogeneous joint that, as the material cools, yields joints that are as strong as or stronger than the pipe itself.
 
7 What are the causes of Electrofusion Joint Failures?
 
The Electrofusion Procedures should be done by skilled Person, There are So many Reasons for Joint Failure like Improper Scraping of the Pipes, Improper Holding & alignment of pipe, Machine Calibration – Machine gives lesser voltage, Excessive Scraping of pipe- Too much loose pipe.
 
8 Why do you scrape the pipe before Electrofusion?
 
Scraping is necessary to remove the oxidized layer formed on pipe, also for Easy movement of fitting on pipe surface.
 
9 Is scraping necessary for Spigot outlet of Saddle before Electrofusion?
 
There is no need of Scraping on Spigot Outlet; As Fitting is packed in plastic bag. Do not open Plastic bag until the pipe surface become ready for electrofusion.
 
10 Why to do Re-Rounding of pipes?
 
During jointing of 2 Pipes by using EF coupler, if the pipe cross section shape has become “Elliptical”, then it is necessary to Re-round the pipe.The elliptical shape does not fit correctly in the coupler socket. Only 2 ends of bigger lobe touch the coupler &there is a gap between the smaller lobe & the coupler, making the joint weak.Re-rounding clamps make the pipe round when it is clamped near the coupler, thus making the contact area to the maximum. Hence the joint becomes sturdy after electrofusion.
 
11 What will you do if Power goes off after half of fusion time?
 
Every TRUSTLENE fitting has ability to get fused twice this is for sake of Power Failure. If power failure, Wait for complete time of cooling and again repeat the procedure of fusion from start when power supply is continued.
 
12 Is it possible to puncture PE pipe; how is that repaired?
 
Yes. PE Pipe get punctured, if depth of scratch is greater than 10 times the thickness of pipe then it can be replaced by jointing Coupler or you can fix it by repair saddle.
 
13 Where can I find details for compatibility of TRUSTLENE Fittings with PE Pipes of Different SDR’s And PN Rating?
 
Engineering practices for compatibility of TRUSTLENE Fittings with PE Pipesof different SDR’s and PN ratings are described in Kimplas Technical Specification Manual.
 
 
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