API Seal Flush Plan 11 + 61
API Seal Flush Plan 11 + 61
(OP)
Hi Guys,
Needing your expertise on seal plush plan 11 + 61 to be used on 98wt% Sulfuric Acid Unloading Pump. Original plan is 11 + 62 which is better. However because water or steam is not allowed (not recommendable) as a quenching media because water or condensate will react with the process fluid (sulfuric acid)original plan was changed. Is this reliable?
Pump Datasheet:
Service: 98wt% Sulfuric Acid Unloading Pump
Pump Operation: Intermittent Service
Normal/Rated Capacity: 15 / 16.5 m3/hr
Pumping Temperature: 19-40 deg C
Specific Gravity @ Pumping Temperature: 1.81
Head: 29.3m
BHP Rated:4.61kw
RPM:3600
Materials:
Case/Trim class: A-8 (API Class)
Case: SS316L
Impeller: SS316L
Mechanical Seal:
Seal Flush Pipe Plan : 11+ 62 (original)
11+61 (recommendation of the pump vendor because water or steam is not allowed (not recommendable) as a quenching media because water or condensate will react with the process fluid (sulfuric acid).
Thanks in advance and more power to this site...
Needing your expertise on seal plush plan 11 + 61 to be used on 98wt% Sulfuric Acid Unloading Pump. Original plan is 11 + 62 which is better. However because water or steam is not allowed (not recommendable) as a quenching media because water or condensate will react with the process fluid (sulfuric acid)original plan was changed. Is this reliable?
Pump Datasheet:
Service: 98wt% Sulfuric Acid Unloading Pump
Pump Operation: Intermittent Service
Normal/Rated Capacity: 15 / 16.5 m3/hr
Pumping Temperature: 19-40 deg C
Specific Gravity @ Pumping Temperature: 1.81
Head: 29.3m
BHP Rated:4.61kw
RPM:3600
Materials:
Case/Trim class: A-8 (API Class)
Case: SS316L
Impeller: SS316L
Mechanical Seal:
Seal Flush Pipe Plan : 11+ 62 (original)
11+61 (recommendation of the pump vendor because water or steam is not allowed (not recommendable) as a quenching media because water or condensate will react with the process fluid (sulfuric acid).
Thanks in advance and more power to this site...





RE: API Seal Flush Plan 11 + 61
We have a dozen or more pumps in this service. All of them are Alloy 20. Several of them use a Plan 11 flush. But, I would want to convert them to gas seals or canned motor pumps. Any future pumps I purchase for this service will be canned motors.
Johnny Pellin
RE: API Seal Flush Plan 11 + 61
RE: API Seal Flush Plan 11 + 61
Johnny Pellin
RE: API Seal Flush Plan 11 + 61
RE: API Seal Flush Plan 11 + 61
In your case the what will happen long term is as the seal leaks crystals will form and the seal is likely to Hang Up. Is this an API Pump?
RE: API Seal Flush Plan 11 + 61
@bk19702-All wetted metal components for the seal are made of alloy 20.
@flexibox-This is an API 610 Pump. For this application, will crystallization possible?
@JJpelin- I will push thru that pump will be manufactured with Alloy 20 materials (impeller, casing,) what about the shaft, should it also be an alloy 20?
RE: API Seal Flush Plan 11 + 61
That being the case, if you are determined to stick to a single seal, then there is nothing wrong and much to gain in using water as a plan 62 quench medium - particularly in respect of avoiding crystallisation.
Ideally, you need a floating bushing or something similar outboard to contain the quench and thereby minimise water consumption. Don't forget also to pipe the water quench in at the bottom and out at the top (opposite to steam or nitrogen quench flow)to ensure that the atmospheric side of the sseal is fully wetted.