Q&A Report Session 16.xlsx

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1	Question Report Session 16 - East
2	Report Generated:	4/21/22 3:03
3	Topic	Webinar ID	Actual Start Time	# Question
4	Short Course 16: An Introduction to Positive Displacement Pumps.	852 0743 3698	4/21/22 1:39	6
5	Question Details
6	#	Question	Asker Name	Answer
7	1	What is criteria for pressure & speed to select forced feed lubrication? which standard for this system is followed?	SAGAR SONAVANE	Forced feed lubrication is mandatory on large power pumps (> 300 kW) and in case the pump crank-mechanism is equipped with sleeve bearings. In addition it may be useful to have positive lubrication when the pump is running at very low speed (< 50 rpm) because at those speeds splash lubrication is not efficient
8	2	Do we have leakages experieced ever for these type of pumps?	SAGAR SONAVANE	Leaking is a must for plunger pumps, but it can be controlled or monitored with a PT, using a closed loop of the leakage back to suction. In addition RP have designed a system called "seal rod box" that avoids leakage reaching the atmosphere by using a nitrogen purge and piping leakage to a drain connection, flanged at skid edge.
9	3	When Submersible Pump has Positive suction but its suction end is extended very deep (fully flooded) What creteria is considered for Head calculation. Whether We have to consider head from impeller to delivery or Bottum suction end to delivery. Please contact raj@ypower.in We have business collobaration	Rajkumar Paul	Not applicable for recip pumps
10	4	What happen if I blinded the suction dampener in either suction or discharge side	John Lester Dumpit	You would lose the smoothing effect of the pulsation dampeners and get pulsating flow. See slide 29
11	5	Could you explain on performance test and MRT in the shop with water? The correction factor?	Reza Hasanzadeh	There is no correction factor necessary. Reciprocating is NOT affected by SG - (pushing 1m3 of feathers and 1m3 of lead from 1 point to another on a frictionless surface uses same energy!) See Slide 18
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14	Question Report Session 16 West
15	Report Generated:	4/21/22 12:10
16	Topic	Webinar ID	Actual Start Time	# Question
17	Short Course 16: An Introduction to Positive Displacement Pumps.	852 7583 3346	4/21/22 11:10	10
18	Question Details
19	#	Question	Asker Name	Answer
20	1	It's my understanding that suction pressure doesn't affect discharge pressure for PD pumps. Is it right? Then, sometimes you have to put a pressure regulator at the discharge side to force a discharge pressure greater than suction. Is it a good practice?	Juan Bello	It is normal practise in designing pumps to API 675
21	2	API 674/675 specify min set pressures for the PSVs. Do they refer to the internal PSV of the pump?	Juan Bello	API 674/675 do not have internal PSVs. The PSV is external and typically set 10% more the maximum discharge pressure.
22	3	Should the PSV be located upstream or downstream of the pulsation dampener at the discharge?	Juan Bello	ALWAYS preferable downstream. It should however be close to the pump
23	4	the discharge line of the PSV, can this be sent directly to the suction line?	REYMUNDO VELASQUEZ	No. It should always go back to the suction vessel in order to avoid short circuiting and resultant overheating
24	5	i may have stepped away and missed the info....with my PD pumps, pulsation dampening has been a recurring issue. what is a resource for details on determining dampening needs on the suction and discharge sides?	Andre Schneider	It can be a question of incorrect sizing or incorrect pre-charge nitrogen pressure (if bladder) or even a non chemical compatible elastomer (if bladder). We need more background to check.
25	6	For a system with a discharge pulsation dampener, should this always be installed such that the flow enters directly toward the pulsation dampener's inlet flange (e.g. not horizontally passing by it)	Joey Kazez	It can be both depending on the design of the damper
26	7	What determine the inlet pressure of a positive displacement pump? Bright Kosini	Bright Kosini	The system determines the inlet pressure and the outlet pressure
27	8	I notice many of the example projects you showed were in the oil and gas industry or bio diesel industry. What other industries does Ruhrpumpen commonly supply PD pumps for?	Andrew Carter	Refinery, fertilizer, petrochemical, detergent, food, industrial, mining, pipelines
28	9	is the crank drive always over running instead of under running and any advantages of each type	John Martinez	Question not clear
29	10	Is it standard to have the relief line upstream of the discharge dampener?	Joey Kazez	ALWAYS preferable downstream. It should however be close to the pump
30	11	Can you explain or provide the sizing criteria for pulsation control devices?	Paul Gerke	There are different formula for sizing depending on the type of pulsation damper and the number of plunger of a specific pump.
31	12	Is it common to route the PSV discharge directly to the pump suction?	Alfonso Ramirez del Campo	No. It should always go back to the suction vessel in order to avoid short circuiting and resultant overheating
32	13	What is the reason for routing PSV discharge to suction vessel instead of suction pipe?	Nancy Chau	In order to avoid short circuiting and resultant overheating
33	14	If I am pumping a more viscous, non-Newtonian fluid, what are the best practices for providing positive suction pressure in the suction of the pump? I'm having trouble pushing the material to the pump.	Paul Wolfinger	I suggest you send us the full details of your application and our product experts will be in touch with a recommendation. Is your fluid a polymer?
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