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@compguy22 : Thank you for your response. Based on your experience, how detrimental can the reliability of low-power fans (<50 kW) running at the left of the surge point be? Specifically for combustion air fan applications.

@SB1976 : Thank you for your response. a) In point 1, you have mentioned " As such, for low power centrifugal fans, there is hardly any temperature rise and hence surge is not a very critical issue.": Can it be inferred that low-power fans can be operated at the left of the surge point without...

@S.Barman: Thank you for the reply.

@S.Barman: Thank you for the reply.

Can anyone provide clarity in understanding: maximum dynamic sealing pressure (MDSP) ( Barrier over Process) maximum dynamic sealing pressure (MDSP) (Process over Barrier) maximum static sealing pressure (MSSP)( Barrier over Process) maximum static sealing pressure (MSSP)(Process over Barrier)...

API 610 12th Edition : 6.7 Wear Rings and Running Clearances Radial running clearances shall be used to limit internal leakage and, where necessary, balance axialthrust. "Impeller pump-out vanes or close axial clearances shall not be used to balance axial thrust". 1. Does this means that...

@TGS4: Thank you so much for sharing the history behind the clause changes.

@pierreick: Thank you for the additional references shared.

@georgeverghese: Thank you for all your input.

@SnTMan: Thank you for the response.

@LittleInch: Thank you for the response.

@pierreick: Thank you for the response. Acronym reference updated in the original query. I understand it is the client's responsibility on deciding the operational philosophy. My query is regarding, how the vendor is selecting the pump. ie we can have access to the selection program of M/s...

UG-33: Subparagraph (a)(1) revised in its entirety 2019: (1) For ellipsoidal and torispherical heads, the required thickness shall be the greater of the following: (-a) the thickness computed by the procedure given in UG-32 for heads with pressure on the concave side(plus heads) using a design...

@LittleInch: Thank you for the response. However for low kW pumps (<20kW), as per my understanding, it is economical to go with the orifice. Also, my query was regarding pump selection, in vendors' software. Since MCSF changes with Rated flow, how do finalize a pump model? (Since it can lead...

As per my understanding pump vendors size centrifugal pumps (consider an API 610, OH2) for the rated flow(Rf). However, if the MCSF flow is through an orifice, this flow needs to be added to the rated flow, and the new flow (Initial rated flow + MCSF) becomes the rated flow (New rated flow...

@georgeverghese : Sorry, I cannot share the curve. However, the delivery pressure is 1.55 psig. The application is for burner combustion air. What are the chances of flow reversal for this application?

@georgeverghese and @LittleInch: Thank you for all your inputs. I really appreciate taking the time in responding to the query. 1. If the blower OEM is accepting these operating points (Left and right of surge line) and assures satisfactory working of the blower at these points (operating and...

@LittleInch: Thank you for your reply. Please do correct me if my understanding is wrong. 1. Please provide clarity on the statement "Long term use at the LHS is OK so long as you are not beyond the surge line". Do you mean not moving the operating point towards the right of the surge line? 2...

@georgeverghese: Thank you for the reply. 1. Practically, How severe is surge and stall for a 25-30 kW (BHP) centrifugal fan/blower (backward vane, aerofoil)? 2. Over a long-term usage, what are the implications of running the blower on the left side of the curve? Thanks in advance.

Would like to hear your opinions on the below points regarding the surge in centrifugal fans/Blowers. (API 673/ API 560) 1. Is surge a major issue in low-power(<50 kW) centrifugal fans? 2. Is it bad or not preferred to operate on the left side of the surge line for such a blower? 3. What are...