Q&A Report Short Course 47 (Both Sessions).xlsm

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1	Question Report Short Course 47 (First Session)
2	Report generated time	2/19/26 2:59
3	Topic	Webinar ID	Actual Start Time	# Question
4	Session No 47: New Developments in the VS6 Market (Eastern)	817 2404 3314	2/19/26 1:43	6
5	Question Details
6	#	Question	Asker Name	Answer
7	1	What is a purpose in separate mounting flange of VS6 pump's can?	Ruslan Sagitov	It is so you can use "Through bolting" on the head/barrel flange. So a stud-bolt through both flanges secured with a nut top and bottom (or a bolt and nut). With the standard design you need to use captive bolts secured with loctite in the barrel flange. See picture on the right >>>>>>>>>>>>
8	2	In the previous description, the stuffing box pressure for Plan 13 was calculated as suction pressure plus 25% of the discharge pressure. Why is this value not equal to the full discharge pressure? Is this difference caused by the presence of a throat bushing in the stuffing box? Does the material of the throat bushing and the clearance used have an effect in reducing the discharge pressure? In addition, is the use of Plan 31 on this VS6 pump possible?	Ilham Maulana Arfah	Plan 13 is usual for a VS6 Pump The pressure at the bottom of the seal chamber is at discharge pressure, which is broken down by the Throat Bushing and the Plan 13 seal flush system orifice to Suction Pressure + 25% If this does not provide sufficient vapour pressure margin then adding a Plan 11 will raise the seal chamber pressure to about suction pressure plus 75% of Differential Pressure and ensure vapourisation does not occur between the seal faces. This is Plan 14 Most commonly this will be in low head pumps
9	3	How Vapour pressure affect for NPSH selection and mechanical seal selection?	Pushpak Akhade	Mechanical Seal vendors will always be consulted to recommend seal types. They will recommend seal type, materials and seal flush plans based on the process conditions and fluid handled.
10	4	Does an impeller have to be balanced after replacing the wear rings?	Gennady Amusiev	Yes. You will have machined the impeller and either tack welded or screwed the wear ring in place, so it will definitely need rebalancing
11	5	What is the purpose of VS6 can clearane with the pit caisson / secondary containment? Could can be touching the wall and still acceptable?	Anonymous Attendee	A small amount of clearance is recommended. If the barrel touches the sides of the pit then bending forces and moments may be transferred to the nozzle head and thence to the mechanical seal
12	6	can bb4 pump rotor be used in vs6 pump. any point to be worried with respect to hydraulic and rotodynamics? is it similar?	Anonymous Attendee	I have seen this done in one or two occasions. It would be an engineered to order pump and very expensive. A conventional VS6 pump will be FAR less expensive.
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17	Question Report Short Course 47 (Second Session)
18	Report generated time	2/19/26 12:14
19	Topic	Webinar ID	Actual Start Time	# Question
20	Session No 47: New Developments in the VS6 Market (Western)	835 4748 7855	2/19/26 10:50	2
21	Question Details
22	#	Question	Asker Name	Answer
23	1	Another great presentation, thank you.	Robert Roy	Thank you for attending
24	2	in vertical pumps using 150# flanged is acceptable isnt it? no need to go to 300# (40Bar)	Rogelio Espinosa	Yes it is. API 610 6.3.6a specifies that VS6 pumps may be designed for 150lb flange rating (so 18.5 Bar) if the process conditions allow that. There is no need to design for 40Bar as a minimum (unlike OH2 & BB2 pumps) For higher pressures where a 300# flange (40 Bar) is required on the discharge side Para 6.3.8 (bulleted paragraph) allows the suction side to be rated for suction pressure.
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