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Friday, October 28, 2011

Velan pushing standards, makes nuclear valves earthquake safe

For Velan, which has been associated with the nuclear industry since 1950. Valve testing is already a deeply ingrained part of serving the industry. After the recent woes in japans nuclear industry caused by the earthquake and tsunami earlier this year, Velan on its 60th anniversary has taken valve testing for nuclear applications to higher standards making them earthquake safe.

Velan put a team of employees to carry out seismic testing of a 18” 600# parallel slide main steam isolation valve with gas over oil actuator at one of the worlds largest seismic testing facilities at Wyle laboratories in Huntsville, Alabama. Velans first part of the test was resonance search where the valve is subjected to low level sinusoidal vibration in one direction at a time to detect its resonance frequencies. The objective is to obtain higher natural frequency than the frequency of an earthquake vibration so that the equipment will not resonate during an earthquake. The second part of the test was earthquake simulation which is a more vigorous test. Velan carried out this test in two parts viz; the OBE and the SSE. The OBE simulates what would happen in a standard earthquake and the SSE simulates what would happen in a catastrophic earthquake of much higher intensity. Velan achieved the much difficult acceptance criteria of results. The first being no physical damage to the equipment as a whole and its functional operation after the test. The second being the valve was made to shutdown during simulation of both these tests and it had to close between 3 to 5 seconds. Velan yet again setting new standards for the nuclear valve industry.

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Friday, October 21, 2011

AUMA’s fibre optic initiative advances actuation

AUMA, the manufacturer and developer of modular electric actuators, reports growth of fibre optics (FO) in process technolgy. Expanding demand for this field data transfer solution, has led to AUMA’s introduction of a single-mode FO interface capable of supporting automation solutions with a range of up to 15km between field devices. Confirmed FO benefits include transmission over large distances. Resistance to EMC ensures data and supply lines can be installed in one duct. Redundant data transmission is achieved by simple loop topology; galvanic isolation is integrated virtually and overvoltage damage is prevented. These advantages led AUMA to equip its actuators with integral FO fieldbus interfaces in the late 1990s.Established multi-mode fibre optic technology supports distances up to 2.5km. Ongoing R&D from AUMA has led to introduction of a single-mode interface version with extended functionality and simplified handling. The initiative introduces a flexibility that caters for substantially greater distances between field devices. An enlarged actuator terminal compartment simplifies cable connection and the new FO solution can be configured, as required. Applications set to benefit include tunnel technology.

A further confirmed benefit of fibre optic interfaces reported by AUMA is evaluation of FO signal quality during operation. Should the optical signal fall short of its required level, an alarm is transmitted to the DCS via fieldbus: appropriate measures can therefore be taken prior to system failure.

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Thursday, October 13, 2011

The ORBIT Rising Stem Ball Valve

The ORBIT® Rising Stem Ball Valve offers a unique, highly-reliable valve with positive shut-off and repeated re-sealing capability. The key to the success of the valve is the rising stem that retracts the ball from its seat before turning, so that the seat is protected from wear and degradation from rotation. Some of the key features of the valve being -155 deg F to 800 deg F (-104 deg C to 427 deg C) operating temperatures, applications include hot oil systems, mole sieve dryers and equipment isolation, unique design which mechanically energizes tight sealing by cam action, single-seat design, bi-directional sealing with zero leakage, injectable packing, self-cleaning and in-line repairable. The unique tilt and turn design with no friction, soft as well as metal seating make it a first choice for use in critical high cycle and high temperature applications. SUBSCRIBE to our blog for the latest posts. DOWNLOAD VALVE SOLUTIONS APP.VISIT OUR WEBPAGE

Monday, October 10, 2011

CAMERON’S ENTECH™ DRV-BN CHECK VALVES OVERCOME HORIZONTAL INSTALLATION HURDLES

For some valve manufacturers it’s a struggle to demonstrate proper check valve operation for compressor and pump station applications – even more challenging is demonstrating successful performance for these applications when valves are operated horizontally. Today,horizontal operation is commonly required by end-users, making brand selection and purchasing decisions more difficult due to the limited levels of assurance current models offer. Cameron set out to design a check valve that could operate effectively during horizontal operation, as well as provide proof of its operational ability prior to installation. The combination of Cameron’s engineering, product knowledge and application experience led to the design and production of the ENTECH DRV-BN Check Valve, which successfully completed stringent API 6A PR2 and API 6D testing in 2011. Using a friction-free, uniquely weighted annular disc, together with a specially tailored spring mechanism, the ENTECH check valve prevents reverse flow and provides end-users with field-tested assurance of successful operation. DOWNLOAD VALVE SOLUTIONS APP.VISIT OUR WEBPAGE

Thursday, October 6, 2011

Rotork delivers all-electric isolating and control valve actuation for gas plants

Rotork actuators are fulfilling the all-electric specification for valve control on new gas dehydration units constructed at seven sites in the Transylvanian region of Romania. The new plants have been built for Romgaz, the largest natural gas producer in Romania, responsible for the production of around 40% of the country’s consumption. Dehydration plants use triethylene glycol to remove the water from natural gas in order to prevent downstream processing problems such as freezing, corrosion and the formation of hydrates.

The specification for the new plants ruled out the use of air instruments and compressors, dictating the use of explosionproof electric actuators for isolating and control valve duties in the hazardous areas. This has been achieved with ATEX certified Rotork IQT isolating valve actuators and CVA control valve actuators. Both designs feature intrinsically safe, non-intrusive setting and configuration technologies, data logging for diagnostics and preventative maintenance planning, and double-sealed watertight environmental protection. The CVA offers a highly accurate and responsive method of automating control valves, without the complexity and cost of a pneumatic supply. With resolution figures better than 0.1% and the ability to eliminate position overshoot, the CVA helps to maximise product quality and plant capacity. DOWNLOAD VALVE SOLUTIONS APP.VISIT OUR WEBPAGE

Wednesday, October 5, 2011

New Flowserve Valbart Trunnion-Mounted Control Ball Valve Helps Control Noise and Cavitation

Flowserve Corporation introduced the new Flowserve Valbart Trunnion-Mounted Control Ball Valve (TMCBV), which is designed to reduce noise, control cavitation and provide increased reliability.

The TMCBV is designed to reduce the total cost of ownership for severe service applications in the oil and gas, chemical, liquefied natural gas and power industries. It combines Flowserve Valbart proven trunnion-mounted ball valve design with its high-performance noise and cavitation-reducing trims.

The TMCBV is fully integrated with a heavy-duty actuator and a high-performance Flowserve Logix digital positioner. This configuration can also be equipped with Flowserve ValveSight advanced diagnostic technology.The metal-seated TMCBV features a tungsten-carbide-coated ball and seat, which can extend the life of the valve by enabling tight shut-off even after prolonged service. The TMCBV is designed for zero external leakage, ensuring that the TMCBV meets environmental standards. Due to the high rangeability and increased flow capacity, the TMCBV is smaller in size and dimensional envelope, when compared with traditional control valve offerings. DOWNLOAD VALVE SOLUTIONS APP.VISIT OUR WEBPAGE