1. The materials for pump parts for each material class are given in Table 9.

2. Separate materials recommendations should be obtained for services not clearly identified by the service descriptions listed in this table.

3. Cast iron casings, where recommended for chemical services, are for nonhazardous locations only. Steel casings (S-1 or I-1) should be used for pumps in services located near process plants or in any location where released vapor from a failure could create a hazardous situation or where pumps could be subjected to hydraulic shock, for example, in loading services.

4. Mechanical seal materials: For streams containing chlorides, all springs and other metal parts should be Alloy 20 or better. Buna-N and Neoprene should not be used in any service containing aromatics. Viton should be used in services containing aromatics above 200°F (95°C).

5. Oxygen content and buffering of water should be considered in the section of material.

6. The corrosiveness of foul waters, hydrocarbons over 450°F (230°C), acids and acid sludges may vary widely. A materials recommendation should be obtained for each service. The material class previously indicated will be satisfactory for many of these services but must be verified.

7. If production corrosivity is low, Class S-4 materials may be used for services at 451-700°F (231-370°C). A separate materials recommendation should be obtained in each instance.

8. All welds shall be stress relieved.

9. Alloy 20 or Monel pump material and double mechanical seals should be used with a pressurized seal oil system.

10. For seawater service, the purchaser and the vendor should agree on the construction materials that best suit the intended use.

11. Class A-7 materials should be used, except for carbon steel casings.

TABLE 9 Materials for pump parts (Courtesy of the American Petroleum Institute, Reference 16)

Material Class and Material Abbreviations"

TABLE 9 Materials for pump parts (Courtesy of the American Petroleum Institute, Reference 16)

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