550 (1022)
Mineral Insulated (MI
240 (464) 220 (428) 100 (212) 120 (248) 140 (284) 160 (320) 180 (356) 200 (392) 20 (68) 40 (104) 60 (140) 80 (176)
Variable Power Limiting (VPL) or Constant wattage
Skin-e ect Tracing System (STS)
Self-regulating (BTV, XTVR, HTV ....)
Series Resistance (SC)
0
50 (164)
150 (492)
250 (820)
343 (1125)
400 (1312)
500 (1640)
700 (2297)
1000 (3281)
1500 (4921)
2000 (6562)
2500 (8202)
3658 (12000)
50 kms. (31 miles)
Circuit lengths m (ft)
Figure 1 Cable technology portfolio: solutions that cover a wide range of temperature and circuit length requirements for any application
Managing process temperatures requires an integrated heat management system Plants and refineries require pre-determined temperature management from pipe freeze protection to high-temperature process maintenance in piping, equipment, tanks, and instruments. Consequently, they need to rely on heat trace cables capable of meeting a broad range of precise design criteria. nVent offers a portfolio of Raychem cable technologies that cover a wide range of temperature and circuit length requirements, as shown in Figure 1 . Moreover, a complete heat management system must also include: • An engineered design using proprietary TracerLynx 3D HMS software to optimise process maintenance piping, equipment, tanks, and instrument temperatures for precise design criteria and conditions. • Power distribution system that provides the most efficient power management and electric heat tracing (EHT) designs. • Control and monitoring system with supervisory software that confirms the system is working properly, offers useful diagnostic information to optimise maintenance and operation, manages alarms, and saves energy.
• Instrument winterisation to protect and ensure reliable operation of instruments. The following case studies exemplify how a complete system using the right technology can solve comprehensive temperature maintenance requirements. In many cases, a combination of heating cable technologies proves most optimum. Case study 1: Constant wattage heating cable technology in LNG industry A major LNG facility in Corpus Christi has access to abundant natural gas and premier marine access with two loading berths large enough to receive the largest LNG carriers. The customer’s mission-critical objective is operational reliability and an optimal frost heave prevention system for three 160,000 cubic metres LNG storage tanks. The project required detailed control and monitoring capabilities to minimise operational risk and maximise productivity. nVent engineers designed a redundant frost heave prevention system using Raychem constant wattage heaters, connection kits, resistance temperature detectors (RTD), and a 277V/480V power distribution combined with a Raychem NGC-30 heat trace control and monitoring unit to save energy, minimise risk, and maximise productivity.
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