Assessment of the Ability of Standard Slurry Pumps to Mix Miscible and Immiscible Liquids in Tank 50h

Poirier, M.

doi:10.2172/1017432

Cited by 1 publication

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A previous SRNL analysis calculated a mixing time of 1.1 hours in Tank 50H based on pilot-scale testing to size pumps for blending feed solution for SWPF. 5 There are several differences between the conditions in the pilot-scale testing and Tank 50H. Because of these differences, the estimated blend time was increased 4X in that document.…”

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 94%

“…Revision 0 Based on the pilot-scale testing, the full-scale H1 = 174.28 inches [174.28 inches was the equivalent height of the liquid level above the pump discharge nozzle in a full-scale waste tank based on the pilot-scale testing performed in 2010 6 ]. Assuming the pump nozzle is 11.5 inches above the tank bottom, H2 = 346.25 -11.5 = 334.75 inches, and solving equation [4] produced equation [5] which is solved for the change in U0D to produce equivalent mixing at the liquid surface.…”

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 99%

“…. = 18.85 [5] Equation [5] shows that an ~39% increase in U0D would be required to have equivalent mixing at the liquid surface. Since U0D is not being increased, the effect on mixing will be the same as decreasing U0D by 39% (see equation [6]).…”

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 99%

“…Reassessing the conservatism within the previous SRNL blend time calculation (SRNL-STI-2011-00362, Rev 0). 5 Utilizing the Salt Disposition and Integration Project (SDIP) data to estimate the required mixing time. 6,7 Determining if transfers into Tank 50H provide adequate mixing of the material.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis looked at the reduction in blend time from reducing the required blending efficiency from 95% to 90%, 85%, and 80%. 8 SRNL reviewed the original assessment document 5 , as well as the data used to perform the analysis and the uncertainty analysis. Following the review, they determined a technical basis exists for reducing the blend time in Tank 50H.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Tank 50H Mixing Pump Run Time Reassessment

Poirier

2020

View full text Add to dashboard Cite

Tank 50H is required to operate a single rotating standard slurry pump for 4.5 hours prior to transfers to the Salt Solution Receipt Tanks (SSRTs) in the Saltstone Production Facility (SPF). This mixing time is required to adequately mix miscible and immiscible liquids within Tank 50H and meet the Saltstone Waste Acceptance Criteria (WAC). The miscible liquids are aqueous solutions of dissolved salts, while the immiscible liquids include organic droplets such as Isopar® L. To support the accelerated salt processing rates from the Salt Waste Processing Facility (SWPF), a desire to reduce the transfer time of Decontaminated Salt Solution (DSS) downstream of SWPF was identified. This document describes the analysis performed to reassess the technical basis for the 4.5 hour mixing requirement for Tank 50H. The analysis employed the following approaches to assess the required mixing time in Tank 50H. Assessing the impact of the required blending efficiency on the liquid blend time. Reassessing the conservatism within the previous Savannah River National Laboratory (SRNL) blend time calculation (SRNL-STI-2011-00362, Rev 0). Utilizing the Salt Disposition and Integration Project (SDIP) data to estimate the required mixing time. Determining if transfers into Tank 50H provide adequate mixing of the material. Assessing the blending occurring in the suction of the transfer pump. Assessing the impact of differences between the pilot-scale miscible liquid blending tests and Tank 50H, shows that the 4X factor used in SRNL-STI-2011-00362 is overly conservative, and that the required blend time in Tank 50H can be reduced. At the current minimum liquid level in Tank 50H (76 inches), the calculated blend time is 60 minutes. The blend time would be longer at higher liquid levels in the tank. The analysis showed that reducing the required blending efficiency from 95% to 80% could reduce the required blending time to as low as 30 minutes (at a liquid level of 76 inches), provided the contents of Tank 50H are still acceptable for Saltstone. An alternative to using the slurry pump to mix the tank contents is to use the "plunging jet" created by the added liquid and blending that occurs as fluid is drawn into the transfer pump suction. Adding liquid to Tank 50H through the downcomer in riser C1 creates a "plunging jet" that will blend the added material with the current contents of Tank 50H. The dilution factor could be as much as 250X. If the plunging jet is used to provide mixing in Tank 50H, the mixer pump should be indexed toward the downcomer through which the material is added to the tank to prevent accumulation of added material under the downcomer. As the liquid in Tank 50H enters the transfer pump suction to be transferred to Saltstone, the recently added material will blend with the other contents of Tank 50H, and the dilution factor could be as much as 600X. These two effects are multiplicative and can be combined. Mixing during the transfer into Tank 50H, combined with the mixing that occurs at the pump suction during the tr...

show abstract

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 94%

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 99%

Section: Review Conservatism In Srnl-sti-2011-00362mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tank 50H Mixing Pump Run Time Reassessment

Poirier

2020

View full text Add to dashboard Cite

show abstract

Assessment of the Ability of Standard Slurry Pumps to Mix Miscible and Immiscible Liquids in Tank 50h

Cited by 1 publication

References 22 publications

Tank 50H Mixing Pump Run Time Reassessment

Tank 50H Mixing Pump Run Time Reassessment

Contact Info

Product

Resources

About