Pump Casing Castings
Pump Casing Castings
(OP)
I had posted the below in the Mechanical forum yesterday and have recieved no responses. Any help here?
I am reviewing specs for pump units for a water system. These are city water (potable water) and approx 50 mgd pumps. The casings are specified as DI or CI. Is there a quality standard for porosity and integrity of the casing? This is not a critical application so I don't think that I can probably use visual inspection methods. I am tying to define void size or porosity. Also, if the casing is cracked, I don't want this to be welded and ground unless I know the procedure and stress relief.
Also, the impellers are cast stainless steel. I have the same concerns.
Hopefully there will be no problems but I want to cover my bases if there are
I am reviewing specs for pump units for a water system. These are city water (potable water) and approx 50 mgd pumps. The casings are specified as DI or CI. Is there a quality standard for porosity and integrity of the casing? This is not a critical application so I don't think that I can probably use visual inspection methods. I am tying to define void size or porosity. Also, if the casing is cracked, I don't want this to be welded and ground unless I know the procedure and stress relief.
Also, the impellers are cast stainless steel. I have the same concerns.
Hopefully there will be no problems but I want to cover my bases if there are





RE: Pump Casing Castings
Do you know the ASTM Standard specification for the castings?
Here is what I would recommend; search on the Internet for the following information
"Steel Castings Handbook, Supplement 2" from the Steel Founders Society of America.
I believe I had downloaded my copy free. Review it for basic information regarding ASTM material specifications for castings.
The American Water Works Association (AWWA) might contain information on casting quality requirements. I did not check for this information.
If you inspect the pump castings, I would recommend a volumetric method like radiographic testing (RT). The following ASTM Standards would be applicable to you;
ASTM E94
ASTM E186 or E146 for heavier wall castings.
Regarding defect acceptance, if the AWWA does not provide guidance, you are on your own for specifying defect type and severity level for this application.
What type of cast stainless steel are the impellers?
RE: Pump Casing Castings
Visual should be fine.
You might think about X-ray for flanges or other loaded parts.
Requiring repair procedures is fairly typical also.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Pump Casing Castings
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Pump Casing Castings
Stainless Steel impellers are ASTM A743 CA15.
AWWA was somewhat generic in their specification. I was hoping for something a little more difinitive. I will look at the ASTM you noted for RT.
EDStainless: xRay is a bit expensive but I may be forced into it. Thanks.
SJones: I have never used ASTM A834. I will need to get a copy of that one. Are MSS SP-53, 54, & 55 a visual inspection. I didn't think these quantfied the inspection. Thanks.
RE: Pump Casing Castings
RE: Pump Casing Castings
RE: Pump Casing Castings
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Pump Casing Castings
In the case of stainless steel impellers most of them are simple ,radiography can be done of necessary , and they can be easily repair welded. Importance should be given to flow path in the impeller.Try to use impellers made using ceramic cores. These will give a clean internal surface with no gas defects or sand inclusions.
I am providing a few references . Also if you can visit the links for grey iron and ductile irons a wealth of information is available.
E1030-05 Standard Test Method for Radiographic Examination of Metallic Castings
E802 Reference Radiographs for Gray Iron Castings Up to 4 in. [114 mm] in Thickness
E689 Reference Radiographs for Ductile Iron Castings
A743/A743M-06 Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
ASTM A536-84(1999)e1
Standard Specification for Ductile Iron Castings
www.ductile.org
www.ironcasting.org
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Pump Casing Castings
RE: Pump Casing Castings
It is best advised not to review these for salvaging,but reject them right away.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke