aircraftengr
New member
- Nov 16, 2001
- 28
Is it advisable to use brass fittings/connectors/adaptors for a marginally high pressured hydraulic system such as an autopilot which can go up to 1000psi?
I am convinced that it is a wrong move, but have been overruled by higher authority due to cost issues - brass is cheap, while stainless steel costs a bomb!
Yet, I am determined not to remain silent about this. Most brass fittings are rated at about 670psi even though they have a safety factor of 4. I still feel this is dangerous. How about forged brass? I was looking through the Parker catalog and found that their forged brass has a rating for up to 3250psi.
However, they do not produce the brass fittings that I need as those are irregular and seldom used. I cannot resort to steel because the fittings are to be in the lazarette and they will definitely rust - steel is out of the question.
Unless someone can prove to me that grease-wrap and painting effectively avoids rusting.
HELP!!
I am convinced that it is a wrong move, but have been overruled by higher authority due to cost issues - brass is cheap, while stainless steel costs a bomb!
Yet, I am determined not to remain silent about this. Most brass fittings are rated at about 670psi even though they have a safety factor of 4. I still feel this is dangerous. How about forged brass? I was looking through the Parker catalog and found that their forged brass has a rating for up to 3250psi.
However, they do not produce the brass fittings that I need as those are irregular and seldom used. I cannot resort to steel because the fittings are to be in the lazarette and they will definitely rust - steel is out of the question.
Unless someone can prove to me that grease-wrap and painting effectively avoids rusting.
HELP!!