to- Mr.Sree Krishna Chopperla,

We have added the comments on the points sent by you vide your e-mail message dated 22/6/2008.

 Comments:

Specification for equipment insulation is missing. Type,thickness etc. for stripper column, reboiler, pre-heaters, FCE, Separators, flash vessels, ATFD etc. to be detailed. ---- OK
There is mismatch in identification no. of Cooler for water ring vacuum pump (drawing: E-111, legend: E-110). Pls. correct it. ----- has been already corrected as E-110
PU-107 in legend is shown for CF pump for stripper column. It is not shown anywhere in the drawing.---- correction done 
Temperature indicator (on panel & field) for vapor temperature of stripper column is key parameter in stripper efficiency. Include this in your scope and also add in P&I. 
-----------OK

Pipe sizes are mentioned in many places. Even some of the lines are in our scope, you may suggest desired line sizes based on design capacities. Accordingly we will arrive at nozzle sizes. 
STS-506—100NB---will be added 
CWR-503--- will be released after the WRVP model is finalized
CWS-502--- will be released after the WRVP model is finalized
STC-507---40NB ---will be added
STC-504---40NB will be added
P—115--- (PU-102 suction) will be released after the stripper bottom pump is fixed 
P-101---- (PU-101 suction) will be released after the stripper feed pump is fixed
VE-193--- (vent of Feed tank) 15Nb will be shown
P-118---(PU-103 suction) will be released after the MEE feed pump is fixed
P-169---( PU-104 suction) will be released after the MEE distillate pump is fixed
VAC-166--- (WRVP suction) will be released after the WRVP is fixed
P-176—(PU-105 suction) will be released after the scrubber pump is fixed
P-181---(PU-106 suction) will be released after the dryer distillate pump is fixed
P-186--- (blower discharge) will be released after the blower model is fixed
AIR-185--(air purge line) will be released after the blower model is fixed
CWS-548--- (WRVP sealant inlet) will be released after the WRVP is fixed
P-550--- (WRVP cooler drain) will be released after the WRVP is fixed
CWS-549--- (WRVP cooler inlet) will be released after the WRVP is fixed
VE-191---(Stripper feed tank vent line)--- will be shown 15NB
P-192---(Stripper feed tank feed inlet line)--- will be shown 40NB

6.    Scrubber of ATFD: Vapor line ID shown wrongly (shown as P-179 instead of PV-179)---will be changed to PV-179
7.    Suction and delivery lines of MEE concentrate pump (P-121 & P-123) are not considered for insulation. These should insulated lines in view of heat conservation and safety   
       reasons. Pls. modify. ----insulation will be shown
8.     Vent lines of FCE -1,2,3,4 ( VE-134, 145, 154, 161): Insulation not considered. Is it okay?. ----Insulation not required
9.     P-178: Insulation thickness not mentioned. ----insulation thickness added in the PID
10.   Distillate lines of MEE (P-167,168,169,170,171) :Insulation not considered. Is it okay?. Whereas the distillate lines of ATFD are considered for insulation?. Why the logic is 
       different in this case. 
MEE distillate temperature is 45deg.C hence insulation is not needed
Dryer distillate temperature is around 100 deg.C hence insulation required for safety

11.  Feed flow totalizer to be incorporated in P&ID for stripper, MEE & ATFD. ????
12.  Include flow meter with totalizer in distillate line of MEE and show the same in P&I.  OK

13.  One valve and drain point to be considered for pipeline of stripper bottom to reboiler.—will be shown 
14.  Steam pressure to stripper & MEE/ATFD should be shown as 3.5 & 8 Kg/cm2 respectively. Whereas they are mentioned as 4 & 8.5 Kg/cm2 in P&I. Pls. modify. 
Pressures are shown 0.5 kg/cm2 more than actual to compensate the pressure drop in the lines
15.  PU-108: Please indicate as open impeller type centrifugal pump.----type will be mentioned in the PID
16.  Why temperature indicator not considered in ATFD vapor line?. Pls. consider . 

Dryer vapour line needs no temperature indicator, Indicators are given to confirm evaporation. The powder coming out from the dryer ascertains evaporation.

16.  In some places question marks are appearing in P&I. Please incorporate appropriate details.
Those details are still not fixed. 


From - Gaurav Bhosale