Page 54: of Offshore Engineer Magazine (Dec/Jan 2013)

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Flowlines

Fig. 6: Fig. 7: Fig. 8: Shore A Hardness Durometer A 100mm x 100mm test A 100mm x 100mm test is used to measure the hardness of specimen of NEMO 1.1 was immersed in specimen of NEMO 1.1 was setup for a the joint after demold time and after the water bath at 80°C for 48hr. There cathodic disbondment test for 28 days at 24hr. The acceptance criterion is =55 at was no edge disbondment and passed 95°C in 3% NaCl solution and -1.5V. The demold and 90±10 Shore A after the acceptance criteria with Rating 1. average disbondment was 8.8mm and met 24hr. the acceptance criteria of =20mm.

NEMO 1.1, 120°C for NEMO 2.1). The Suresh Choudhary, properties of the system were measured at

Regional Technical

Lead for fow various intervals during the testing.

For NEMO 1.1, Fig. 4 shows the same assurance technolo- trend as can be seen in polyurethane gies, is responsible materials: a period of plasticization due for the development to water absorption leads to a reduction of new products and in tensile strength and a reduction in provides technical ductility. After a period of 10 months, expertise on Bredero Shaw’s product

NEMO 1.1 entered a plateau state with spectrum within fow assurance products no further loss in ductility or tensile and services. Suresh graduated from Two series of six plaques

Fig. 9: strength (Fig. 9). For NEMO 2.1, Fig. 4 Texas A&M University in Business measuring 150x45x13mm were machined also shows an initial increase in tensile Administration (MBA), and the University from NEMO 2.1 material to establish the strength due to continued bond forma- of Twente, Netherlands, in Chemical elastic modulus of the material. Tensile tion. This is followed by the effects of Engineering (MS). Suresh has more than bar dimensions were as per ASTM D638- 03 Type IV. plasticization in the material, and reduc- seven years of experience in management, tion in tensile strength close to the initial and business development. primer. The surface preparation steps are value and approaching a plateau phase. same as for PU or IMPP systems. A mold The ductility of the material to this point Dr. Adam Jackson, is placed over the feld joint or the subsea is sustained or even slightly increased Vice President of structure and NEMO material is injected during the exposure period. Technology for global

In conventional PU systems, high into the annulus. The exact demold time fow assurance, is the water uptake results in loss of thermal is specifc to the dimensions of the feld technical authority and mechanical properties. The uptake of joint but can be as low as six minutes for the development water in the NEMO system has also been (Fig. 6). The excess material is trimmed of new products in measured over time. The results are shown and the surface is inspected for quality the fow assurance in Fig. 5. Limited water uptake at higher (Fig. 3). group. Adam has a Ph.D. in chemistry temperature is one of the key advantages from the University of Hull, UK. He is

Technical performance that NEMO has over the PU systems.

based in Orkanger, Norway and has more

Additional tests were conducted on than 25 years of experience in materials

Mechanical and thermal properties of the cured system are given in Table 1. the NEMO system, including the hot technology for the offshore oil and gas

The mechanical performance of the water soak test (Fig. 7) and the cathodic industry.

system has been verifed through interface disbondment test (Fig. 8).

Paul Kleinen, P.E., adhesion testing, system to substrate testing

Conclusion

Vice President of and cast-to-cast interface testing. Values at

NEMO is tailored to meet the increasing Engineering and ambient temperature are given in Table 2.

Mechanical performance of the feld technical demands of new well devel- Technology, is joints was verifed through simulated opments that require subsea products responsible for reeling testing, where a 60 mm FJ on a to operate continuously and reliably at capital projects and 10.75in.-diameter pipe was successfully higher temperature operating conditions. process technology at reeled (4 cycles) with no incident at 0°C Based on technical performance, NEMO Bredero Shaw. on a 7.6m radius former. helps meet the performance void cre- Paul earned a BS in civil engineering

NEMO 1.1 and 2.1 were exposed to 18 ated by problems associated with the PU from the University of California, months and 12 months, respectively, of systems and offers a reliable solution for Berkeley and is a registered professional aging under hot-wet conditions (95°C for 80-120°C temperature range. engineer in California.

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