Corrocio

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Ashcroft® Gauges, General Information

Page:

ASH/PI-14B April 6, 1992

Date:

PRODUCT INFORMATION
CORROSION DATA GUIDE DRAWING NO. 96A121 REVISED The attached revised Corrosion Data Guide supersedes drawing No. 96121, Rev. B, previously issued on Product Information page ASH/PI-14, dated 10/01/80. This guide has been extensively revised and is based upon an in-depth review of availablematerial, general corrosion literature, field experiences, laboratory tests and material suppliers’ recommendations. The guide represents a much more cautious approach reflecting the current legal climate. The Stratford Engineering Department will provide assistance when necessary, but the customer’s engineers should always be consulted first. If Dresser Ashcroft Engineering is to be questioned,please be prepared to supply the following information: Pressure Temperature Concentrations of each constituent Impurities Adjacent piping material Location Inhibitors used Name and phone number of the facility engineer or technical contact As stated on sheet #1 of drawing 96A121, this corrosion data guide is intended to be used solely as a general guide in the recommendation of materials used oncorrosive services. It is regarded as an indicator only and not as a basis of absolute guarantee.

Copyright Instrument Division, Dresser Industries, Inc.

2/97

CORROSION DATA GUIDE FOR PRESSURE INSTRUMENTS AND DIAPHRAGM SEALS NOTE – WARNING – NOTE This guide is the only document to be used in making recommendations for corrosive service for Instrument Division products. Careless use ofthis table could result in an accident endangering life and property. Most process plants or refineries have chemical or corrosion engineers, who are very capable of specifying instrument materials, since they are familiar with the details and past history of their own applications. This table should be used only when the customer has no such resource. The table is intended to serve solely as ageneral guide in the recommendation of materials for corrosive services and must be regarded as indicative only and not as any guarantee. There are many conditions which cannot be covered by a simple tabulation, such as this. More detailed information is contained in standard references, such as the National Association of Corrosion Engineers Corrosion Data Survey, Metals Section or Non-Metals Section,available from: NAGE, P.O. Box 218340 Houston, TX 79231 Phone (713) 492-0535 Many of the chemicals listed are dangerous or toxic. Non material recommendation should be made when there is insufficient information, a high degree of risk, or an extremely dangerous chemical. The user is responsible for securing the services of a qualified engineer to recommend materials. As noted in ANSI B40.1 1985,Paragraph 4.3.3 and 4.3.4: The elastic element is generally a thin walled member, which of necessity operates under high stress conditions and must, therefore, be carefully selected for compatibility with the pressure medium being measured. None of the common element materials is impervious to every type of chemical attack. The potential for corrosive attack is established by many factors,including the concentration, temperature and contamination of the medium. . . . In addition to the factors discussed above, the capability of the pressure element is influenced by the design, materials and fabrication of the joints between its parts. The Stratford Engineering Department will provide assistance when necessary, but the customer’s engineers should always be consulted first. If DresserAshcroft Engineering is to be questioned, please be prepared with the following information. Pressure Concentration % of each constituent. Adjacent piping material Hazardous Location? Temperature Impurities Inhibitors used

Name and phone number of the facility engineer or technical contact.
Copyright Instrument Division, Dresser Industries, Inc. 2/97

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