Do you mean vapour cross-flow channeling?
I have an article that has following information about vapour crosss-flow channeling.
Vapor crossflow channeling has been attributed to the liquid-phase hydraulic gradients which often occur on trays having high liquid rates, long flow path lengths...
Formula for pump efficiency as function of specific speed is given in Pump Handbook by Igor Karassik, chapter 2, page 2.24 (equation 24).
I am attaching extract of the equation for quick reference.
An efficiency calculator is available on internet for free download. You need to know rpm, flow...
I have not seen anyone specifying shut-off pressure as 1.5 times design pressure.
Still possible explaination of this can be:
Line hydrotest pressure is 1.5 times design pressure. For cases like tube rupture we take credit of hydrotest pressure of low pressure side.
I would prefer to size...
After I posted my reply, I thought myself as an operator. I was expecting operator to be a rational being. But then I know how we use non-rational ways like judgement, rules-of-thumb due to schedule pressure during design stage.
In the end I thought it would be better to be safe than sorry...
Pleckner,
I do not have operations background and hence may be little ignorant about operator behaviour. Consider this post as my way of getting first hand information on operator behaviour.
However, as a designer I would argue against using 200 psig upstream pressure on two counts: technical...
This post has already had replies from many of us. I hope I am not that late in putting my views. Here is what I would do:
I would base my relief rate on maximum operating pressure in upstream vessel i.e. 150 psig in above case. My argument is two-fold:
1) API 521, 2007 edition, section 5.10.3...
In original paper of Hill, velocity is indicated as VL-bar indicating usage of absolute value of velocity.
I have used absolute velocity for slope determination and have also calculated it using another method. Results match except that Hill formula gives negative value. Taking absolute value...
