Presumably, the reason for the high strength heat treatment is to achieve a higher pressure rating. The ends and the iron tubulars following it are rated to 15k psi. We run at 50 to 60% rated capacity.
Metengr, the "hydrogen-assisted SCC mechanism" you spoke of, does this require sulfide...
Thanks for the responses so far.
Stanweld, you've assumed correctly. The heads are heat treated to about 140K psi yield strength. They are also autofrettage treated, which has been indicated on one report as being unnecessary, and may potentially exacerbate the situation.
The reason for our...
Intentionally vague, btrue. The alloy was designated by the manufacturer as 4S16854, but that means nothing to me, and I'm not sure would mean anything to anyone else.
One analysis has it as: 0.3% C, 0.5% Mn, 1.1% Cr, 0.5% Mo, 2.6% Ni, 0.2% Cu, 0.1% V, and 0.2% Si
This doesn't appear to be...
We've seen numerous fluid end failures due to cracking, and have several engineering reports in hand identifying stress corrosion cracking(SSC), or corrosion-fatigue cracking as the reason for failure.
The fluid ends are constructed of an alloy steel, and are pumping water with many...
