Methods for Hardening Pump Casings
AssigneeViking Pump, Inc.
InventorWilliam Vogel
Life of this patent
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Abstract
A method for manufacturing a hardened casing for a vane pump is disclosed. The method includes providing a vane pump casing; hardening the casing by (i) cleaning the casing with a high pressure fluid containing abrasive material, (ii) loading the casing in a furnace, (iii) purging the furnace with an inert gas followed by purging the furnace with ammonia, (iv) conducting a first heating of the casing in the furnace at a first temperature of about 1200° F. for a time period of about 4 hours, (v) conducting a second heating of the casing in the furnace at a second temperature of about 1000° F. for a time period of about 4 hours, and (vi) cooling the casing and purging the furnace with an inert gas before removing the casing.
Claims20
A method for manufacturing a pump, the method comprising:
- providing a cleaned casing;
- hardening the casing by
- loading the casing in a furnace,
- purging the furnace with ammonia,
- conducting a first heating of the casing in the furnace at a first temperature ranging from about 1100 to about 1500° F. for a time period ranging from about 3 to about 5 hours,
- conducting a second heating of the casing in the furnace at a second temperature ranging from about 800 to about 1200° F. for a time period ranging from about 3 to about 5 hours,
- cooling the casing and purging the furnace with a second inert gas;
- and
- assembling the pump with said casing.
A method for manufacturing a casing for a vane pump, the method comprising:
- providing a casing;
- hardening the casing by
- cleaning the casing,
- loading the casing in a furnace,
- purging the furnace with an inert gas,
- purging the furnace with ammonia,
- conducting a first heating of the casing in the furnace at a first temperature ranging from about 1100 to about 1500° F. for a time period ranging from about 3 to about 5 hours,
- conducting a second heating of the casing in the furnace at a second temperature that is less than the first temperature and which ranges from about 800 to about 1200° F. for a time period ranging from about 3 to about 5 hours, and
- cooling the casing and purging the furnace with an inert gas.
15 The method of claim 12 wherein the first heating is carried out a temperature ranging from about 1200 to about 1400° F. for a time period ranging from about 3 to about 5 hours.
A method for manufacturing a casing for a vane pump, the method comprising:
- providing a vane pump casing;
- hardening the casing by
- cleaning the casing with a high pressure fluid containing abrasive material,
- loading the casing in a furnace,
- purging the furnace with nitrogen followed by purging the furnace with ammonia,
- conducting a first heating of the casing in the furnace at a first temperature of about 1200° F. for a time period of about 4 hours,
- conducting a second heating of the casing in the furnace at a second temperature of about 1000° F. for a time period of about 4 hours, and
- cooling the casing and purging the furnace with nitrogen before removing the casing.
Dependencies are inferred from the claim text.