TPi January 2022

Business & market news

Safe high-density polyethylene conduit pull strength technical document is now available

Installers can quickly look-up the safe pull strength for the conduit they are using from the tables, derating it for actual ambient temperature conditions and the time under tension, for use with an in-line tensiometer or in selecting the breakaway link with the correct rating. The SPS values already include the appropriate safety factor. TN-63 is applicable to any pulled into place installation, including open trench and horizontal directional drilling (HDD) methods. Tables of SPS values are provided for industry standard DR and Schedule wall types, up to 6" in diameter. An explanation the behaviour of conduit under load is provided and guidance on installation considerations is included. Published on PPI’s website TN-63, is one of several PPI documents related to the design and installation of HDPE conduit which are published as a service to the industry. The PPI Conduit Design Calculator provides assistance in selecting HDPE conduit types for mini- HDD applications. The Plastics Pipe Institute Inc www.plasticpipe.org small batch sizes. All these benefits enable the tubes to extend the operational life of critical subsea instrumentation. Fine Tubes is dedicated to manufac- turing high quality, precision tubes to tough industry specifications. The busi- ness has a long and successful his- tory of operating in the oil and gas and chemical process sectors. Its Super Duplex products deliver extended product life and reduced downtime and maintenance costs, as well as enhanced strength and corrosion resistance properties. Super Duplex tubing from Fine Tubes performs without failure time and time again, offering maximum pressure resistance up to 100,000psi. Fine Tubes www.finetubes.co.uk

exerted on the conduit,” said Patrick Vibien, P, Eng., director of engineering for the PCD. “If the safe pull strength is exceeded during installation the conduit may permanently deform at some location along its length. This necking down may create an obstruction within the conduit such that when the cable is later pulled into place, it is be blocked from passing through this section. Knowing the safe pull strength will protect the conduit during installation and the investment in the installation.”

The Plastics Pipe Institute Inc (PPI) has released a new technical note to assist conduit installers in calculating safe pulling loads in order to avoid damaging high-density polyethylene (HDPE) conduit. TN-63 is available for free at https:// plasticpipe.org/pdf/tn-63-2021.pdf from the PPI, which is the North American trade association representing the plastic pipe industry. “When pulling HDPE conduit into place, an increasing axial tensile load will be

PPI TN-63 safe pull strength cal- culations for conduit: including derating factors provides not only the equations used to calculated the Safe Pull Strength (SPS) for HDPE conduit but easy-reference tables of pre- calculated SPS values for typical industry HDPE conduit wall diameters and thickness types. Guidance is also provided on how to derate the safe pull strength for elevated tempera- ture installation and time-under- tension considerations.

The document assists conduit installers in calculating safe pulling loads to avoid damaging high-density polyethylene (HDPE) conduit

Super Duplex tubing now with enhanced strength and improved corrosion resistance for oil & gas

The demanding nature of marine environments makes it critical for subsea oil & gas instrumentation to offer excellent corrosion resistance and a high mechanical strength. Materials must be resistant to stress corrosion cracking, pitting and crevice corrosion and fatigue. All of this and more, including high performance, and superior strength over a long period of time. Super Duplex tubes from Fine Tubes operate in the most aggressive off- shore, downhole and subsea environ- ments. They meet the industry’s strict quality and safety requirements and are engineered to operate without fail- ure in chloride-bearing environments. Demanding applications include heat exchangers, flow meters, downhole pressure housings and smart wells, and other critical downhole oil & gas instrumentation.

High-pressure tubing with pressure ratings of up to 100,000psi for subsea control units

The NOROSK M-650 approved Super Duplex tubes manufactured by Fine Tubes can be made to order in standard and specialist non-standard sizes in seamless straight lengths. Advantages include custom-made to precise customer requirements, high- quality, extremely reliable product performance, short lead times, and

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TUBE PRODUCTS INTERNATIONAL January 2022

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