Release Date: 8/1/12 Products Affected: Series M200, R200, M285, R285 For More Information: Gordon Dorr 713-466-3552 [email protected] There are four Norris butterfly valve product series that are rated for positive shutoff: Hydrostatic Testing Positive shutoff, as defined by Norriseal, requires the valve to pass a hydrostatic (liquid) test with zero leakage. No water (zero drops) is allowed to pass through the valve on the seat test and no water (zero drops) is allowed external to the valve on the shell test. All (100%) Norris butterfly valves are hydrostatically pressure tested before shipment. There is no statistical or random sampling. Test pressures, based on the valve pressure rating and valve size, and the duration of the test may be found in the enclosed test procedure charts (see Assembly/Test Procedure E1 on pages 2 & 3). These pressures and durations are based on recognized industry standards. Pneumatic Testing In addition to hydrostatic testing, Norriseal can also perform pneumatic (air) testing on valves when required by our customers. Norriseal test stands are built to the requirement of the ¼ -inch tubing immersed in water in the bubble jar to the specified depth. The API 598 low-pressure seat closure test can be performed on any size valve with any given pressure rating. Norriseal regularly hosts third-party inspection services that witness the air seat test and attest to the zero bubble capability of the valves. Norriseal equipment is capable of testing to a variety of air test requirements, such as the API 80 psi (60 – 100) or the 50 psi requirement dictated by other industry standards. Norriseal currently offers a testing service to a customer who requires a 235 psi air shell test on 100% of valves supplied to that customer. Again, the requirement to pass the low-pressure seat closure test is zero bubbles – there can be no leakage in order to pass the test. Continued on page 2 No. 120801 Engineered Performance Norriseal is an ISO 9001- certified manufacturer of level and pressure control products, level gauges, control valves, butterfly valves, check valves and regulators. For more than five decades, Norriseal products have set performance standards in oil and gas production, gas transmission, refining, chemical processing, marine, power generation and other industrial applications. Positive Shutoff Capabilities and Leak Testing of Norris Butterfly Valves Technical Bulletin Tel: 713·466·3552 Fax: 713·896·7386 www.norriseal.com ©2012 Norriseal. All rights reserved. ™Norriseal is a mark of Dover Corporation. All other marks are property of their respective owners. (1) resilient seated 200 psi (Series R200) (2) metal seated 200 psi (Series M200) (3) resilient seated 285 psi (Series R285) (4) metal seated 285 psi (Series M285) Notes ᔢ TECHNICAL BULLETINS DO NOT ENHANCE OR EXTEND AN EXISTING WARRANTY, AND DO NOT INCLUDE OR CREATE ANY WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Preventive service repairs will generally not be performed under warranty during the normal warranty period if a product is not exhibiting the particular symptom or problem or if the problem would not otherwise be covered by a warranty. Technical Bulletins are not recalls. Any product alterations by anyone other than Norriseal will defeat the design of the product. Accordingly, Norriseal will not be liable for any problems caused by such alterations. Technical Bulletins are provided for informational purposes only. Complete detailed information is not provided in each bulletin. If a problem or symptom exists or suspected to exist, Norriseal should be consulted promptly. ᔢ As we continue to receive questions and comments, this bulletin will be updated as necessary. ᔢ Due to the continuous improvement at Norriseal, specifications and/or prices are subject to change without notice or obligation.