Brass female nipple fracture on assembly
Brass female nipple fracture on assembly
(OP)
Hello,
I am looking to see if anyone has seen something similar. This is a brass male nipple and it fractured on assembly as can be seen in the picture attached.
Anyone seen threads fracturing in this manner before?
Happened 3x.
I am looking to see if anyone has seen something similar. This is a brass male nipple and it fractured on assembly as can be seen in the picture attached.
Anyone seen threads fracturing in this manner before?
Happened 3x.
RE: Brass female nipple fracture on assembly
RE: Brass female nipple fracture on assembly
RE: Brass female nipple fracture on assembly
RE: Brass female nipple fracture on assembly
Best advice - buy from a reputable source.
RE: Brass female nipple fracture on assembly
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Brass female nipple fracture on assembly
send it to a met lab for failure analyses, my guess bad product. defects
RE: Brass female nipple fracture on assembly
What is the thread form supposed to be? Is it actually?
Same questions for the mating hole or holes?
How big is the gorilla doing the assembly and how long is his wrench? It's brass. Brass is not a particularly strong metal. Twist it hard enough and it will break.
Do not waste your money on a lab failure analysis because you will get no useful actionable information.
If the lab reports that "it's bad", what do you do with that report? Demand a refund? Take it to the supplier and wave it their face demanding process improvements?
This is commodity junk from China or India. How much time and expense are you going to spend on it?
Rule out any obvious problems with the thread forms and assembly process, then get on with life. Order new nipples from a different supplier if you don't find any obvious problems.
RE: Brass female nipple fracture on assembly
RE: Brass female nipple fracture on assembly
One of them looks to have an o-ring groove on the end, but man that is some awful and incomplete photography - like where are the broken off fragments, where were they installed? In the first picture - is that a long prying lever threaded into the broken piece?
RE: Brass female nipple fracture on assembly
Torque values,
RE: Brass female nipple fracture on assembly
RE: Brass female nipple fracture on assembly
TTFN (ta ta for now)
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RE: Brass female nipple fracture on assembly
It looks to me like an overload failure ie the tensile load put on the threads while tightening up was to high.
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RE: Brass female nipple fracture on assembly