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Valve World Specialist Article No. 4

Under fire - Fire safe valves withstand explosions and blazes. Demand is growing.

Danger lurks everywhere. Fires are a daily risk in the oil and gas industry. Valves must cope with extremes in case of an emergency. Components thus need to be fire safe if they are to withstand threatening situations. Everything else would be playing with fire. No wonder demand is increasing for fire safe valves.

Losses can be devastating in an emergency; therefore, safety is just as high a priority for valves as high quality, and a long-life cycle. “Fire safe valves are mainly used in the oil and gas industry, as risk of fire is high,” explains Stefan Keller Product Manager at AS Schneider. Fire hazards lurk in each step of the process – ranging from oil and gas production to transport as well as in refineries and storage. The consequences could “understandably be substantial,” emphasises Stefan Keller.

Danger for man and material
Explosions in refineries or on oil rigs are a threat to man and material. A defective blowout preventer with safety valves played a major role in the devastating catastrophe on the oil rig “Deepwater Horizon” in the Gulf of Mexico. The valves malfunctioned, 780 million liters of crude oil flowed uncontrolled into the ocean, causing several billion dollars in damages and eleven men died and 600,000 birds perished. Other sectors also place their trust in fire safe valves. Petrochemistry, for instance, where “filling processes of inflammable substances in tank farms” are customary, explains Vetec Ventiltechnik. In a critical situation, fire safe valves have to stand the test in real conditions, particularly in view of having to handle fast filling times. Vetec developed a rotary plug valve with a double eccentric plug design, which ensures that there is no contact between plug and seat while rotating. No particles can adhere in between. “The housing is basically free of dead space, so no troublesome soot deposits can occur,” states Vetec.

Operating with highly flammable materials
Fire safe valves also provide the chemical industry with much needed security. Ethylene oxide becomes highly flammable in contact with oxygen, reports Vetec. In an emergency, fire safe valves go through extremes to keep the plant safe. Valves should not only have a fire safe design, but also be certified as fire safe. Here, fire safe testing facilities come into play.

Specialized testing facilities leave nothing to chance and put valves through their paces. Take Amtec, for example. The company developed a new fire safe test rig to test valves according to DIN EN ISO 10497, API 607, API 6FA or API 6FB. “With this test rig, all important type acceptance tests for fire resistance can be conducted,” says Manfred Schaaf from Amtec Advanced Measurement. Not only that: if needed, client-defined testing procedures can also be performed. This allows individual applications to be tested.

Automated ignition process
Amtec’s test rig allows automated test procedures without manual intervention during firing and pressurising – for instance for regulating temperature and pressure. Ignition is automated, as well as the burner shutdown after the end of the firing period. Valve manufacturers are promised an improved repeat accuracy, a lower variation of temperature curves between tests and full compliance with norms. User-defined procedures are configured. And all of this with an increased level of safety, states Amtec: housing and burning chamber with window are closed, the flame is controlled, a pressure relief valve adds a further level of security. The housing temperature is controlled, including the automatic cooling system. The test rig is equipped with an emergency shut off function, turning off the burner and pump.

Under fire for 30 minutes
The stresses a valve must withstand in the test rig also depend on the test standard. There are important main criteria: the valve must be able to resist interior pressure – depending on norm, valve size and type. Water is used as a medium. Firing lasts 30 minutes, the flame reaches a temperature of up to 1000 °C, and the housing temperature 600 °C. After the firing period, water is used to cool down the valve to 100 °C, over a period of ten minutes. Depending on norm, cooling can also take place using air. It is essential for the “leakage rate to comply with the specific norm,” emphasises Manfred Schaaf. Packaging, housing seal and seat are viewed as critical. If a valve fulfils the leakage criteria set in a norm, the product receives a certificate: tested fire safe!

Enhanced test rigs
Safety is too important for things to stagnate. “Due to changing testing requirements the test rigs have to be modified again and again,” states Manfred Schaaf. Investments are always required: just recently, the company put a test rig for cryogenic temperature applications into operation. Amtec is continuously expanding in the lucrative testing facilities field. Meanwhile, various testing facilities are available for testing seals, valves and stuffing boxes. The Firesafe test stand was developed as part of a project sponsored by the German Federal Ministry of Economics and Technology. A project with a driving force for Germany.

Various testing institutes in Europe already had individual test rigs, but the most important institute for fire safe certifications has so far been a testing laboratory in the U.S. “With the test rig we developed type approval tests can now also be conducted here in Germany,” says Manfred Schaaf. “Valve manufacturers, or the customers, often want to attend tests, and this is now possible rather easily”.

Leakage-free and closable
AS Schneider’s valves and valve blocks have mastered the load tests in a test rig. Even after extreme test conditions, the certified valves were not only leakage-free, but could also be fully operated as well as opened and closed repeatedly without problems.

High-performance ball valves made by Hartmann Valves are another example. They can be operated in temperatures ranging between – 200 to +550 °C, pressure stages up to 700 bar and with aggressive media. Realized entirely in metal, the sealing systems between ball and seat ring fulfil a leakage rate of A, or 0. Special construction features and safety-oriented functions such as DBB (double block and bleed), DIB (double isolation and bleed) and fire safe create higher levels of safety. This is a necessity, as the ball valves are used with all kinds of media - from oil, natural gas, acid gas, brine, oxygen and hydrogen to steam, thermal water and abrasive or degreasing media.

Quenched below 100 °C
Ebro subjected its HP-300 valves to intensive fire tests complying with ISO 10497. The valves were placed under water pressure, the ISO norm demand 75 percent of the operating pressure. “The HP 300 was pressurized with an operating pressure of 37.5 bar,” states Ebro. Afterwards, the valve was fired with a propane gas, with temperatures reaching 650 to 1,000 °C. A condition which lasted 30 minutes, followed by a first leakage test. “Subsequently, the valve was quenched to a temperature below 100 °C and a second leakage test was conducted”.
Ebro’s test objects were nominal diameters DN 80 and DN 200 in two different materials – CrNi steel 1.4408 and C steel 1.0619 – each with a full metal and laminated seal. “The tests were successfully completely, without any objections”. Mission accomplished.

Material strength
What can increase the chances of a valve being certified as fire safe? Strength is important when choosing the material, especially as far as higher temperatures are concerned. “Not only the materials used for the valve housing play a role, but also the material the screws are made from, and naturally also the material used for the seal are essential,” states Schaaf. Only then can a valve withstand its trial by fire, without being under fire itself.

AS Schneider’s company practice shows: “Fire safe valves made from all common materials are in demand,” reports Product Manager Stefan Keller. “Exotic materials are more seldom,” he adds, as separate certification tests have to be made for different materials groups. Common and proven valves in the oil and gas industry are made from stainless steel and carbon steel.

Ball valves for power to gas
Fire safe products also let valve manufacturers score with special projects, such as power to gas plants. Such valves are successfully used in the “WindGas Falkenhagen” plant, operated by Eon Gas Storage GmbH. Hartmann Valves supplied this German demonstration plant with 24 metallic sealing ball valves, designed to meet the high requirements and safety levels for use with pure hydrogen. Power to gas is a process to change electricity from renewables into chemical energy. The technology is supposed to help feed-in management match electricity production from renewables to consumption, in order to prevent bottlenecks.

Fire safe a seal of quality
Fire safe has long become a seal of quality. Companies in various sectors can’t do without this seal, and sometimes even are not allowed to. “We conduct fire safe tests for all new products to be used in such industrial sectors, from the ground up, in order to certify them,” states Keller. Demand, however, depends on the oil price, but is “continuing to rise”. Innovations in these fields will be presented at Valve World Expo 2018 in Düsseldorf, Germany.

Valve World Expo 2018 in Düsseldorf
At Valve World Expo, 11th International Valve Trade Fair & Conference, exhibitors will showcase the latest machinery and equipment for the valve sector, including valves, valve components and parts, actuators and positioners as well as pumps, compressors, engineering services and software. The concurrently held Valve World Conference will feature workshops and specialist presentations on valve and fittings related topics as well as new trends and designs. The event will take place from November 27 - 29, 2018 at the fairgrounds in Düsseldorf, Germany.

For Valve World Expo 2018 press information, contact:
Anne Meerboth-Maltz
ameerboth@mdna.com
Tel. (312) 781-5185

Messe Dusseldorf North America Located at 150 N. Michigan Avenue, Suite 2920, Chicago, IL. Phone: 312-781-5180. .