Mike had posted a reasonable response to the post re: baloni cuts. The only safety related item in his post was not to reduce the outlet diameter of the exhaust. A perfectly reasonable thing to mention since mentioned in every safety valve installation manual are items regarding the valve outlet backpressure or the limit of any backpressure created by the outlet piping & design. He did say " You probably know this"
A very quick Google found this from the Spirax/Sarco website: I have bolded the most important sentences.
A statement was made with a basic misunderstanding (that the reason industry moved away from that design also applies in our circumstances). A little research would have shown this to be the case. Maybe if a question was made like: "Does angling the end of the discharge tube lower the noise, it's was done in industry but they moved away because of the force created. Is this an issue in our sized steam plants?" you might have received some more useful answers.Reaction forces when discharging
In open systems, careful consideration must be given to the effects of the reaction forces generated in the discharge system when the valve lifts. In these systems, there will be significant resultant force acting in the opposite direction to that of discharge. It is important to prevent excessive loads being imposed on the valve or the inlet connection by these reaction forces, as they can cause damage to the inlet pipework. The magnitude of the reaction forces can be calculated using the formula in Equation 9.5.2:
equation 9.5.2 gcm72.jpg
fig 9.5.7.jpg
The reaction forces are typically small for safety valves with a nominal diameter of less than 75 mm, but safety valves larger than this usually have mounting flanges for a reaction bar on the body to allow the valve to be secured.
These reaction forces are typically negligible in closed systems, and they can therefore be ignored.
Regardless of the magnitude of the reaction forces, the safety valve itself should never be relied upon to support the discharge pipework itself and a support should be provided to resist the weight of the discharge pipework. This support should be located as close as possible to the centreline of the vent pipe (see Figure 9.5.7).
Figures 9.5.8 and 9.5.9 show typical safety valve installations for both open and closed systems.
I like a spirited conversation as it gets the thought process going but it is the internet, any question will be answered and many answered that weren't asked. You surely can't be surprised if you ask a "how many angels can fit on the head of a pin" type of question that the response might be that maybe angels don't even exist.
Cheers
Ken