Dear gents,
I would appreciate if you will support in questions of startup, normal shutdown, . I'm interested in general philosophy and probably will miss such things as oil system, air cooling, motor and so on - i will assume that it's in normal and proper operation and sets.
below general description of compressor unit.
1.Manufacturer. (Packager: Chinese company, compressor Ariel).
2. 2 stages. 1st β 1cyl (D=12.5in, MAWP: 5.5MPa). 2d β 3 cyl (7.875in, MAWP:13,1MPa).. Stroke:5.50.
3. Rated RPM:1200 (actual 900).
4.
P (MPag)
T ©
Suction at 1st compressor stage - 0,5-0,6 (MPa) - 45C
After 1st compressor stage 1,8-1,9 - 120
After 1st cooling stage 1,8-1,9 - 45
Suction at 2d compressor stage (additional line)
+
After 2d cooling stage 1,8-1,9 - 45
After 2d compressor stage 7,25 - 138
After 1st cooling stage 7,2 - 45
5. composition:
CH4 40%
C2H6 15
i-C4H10 12
n-C4H10 7,5
i-C5H12 2,2
n-C5H12 1,2
N2 0,2
C02 1,3
H2O 0,1
CH3OH 0,2
6. Electrical Motor ABB. 910kW (10kV) (constant speed)
7. No additional options just recycling valve at of each stage.
8. compressor will run continuously β in general itβs N+1 reservation. (in our case 2+1).
1) startup.
b)before to start motor: suction SDV (10037,10039) are closed. discharge SDV closed. SDV in recycle lines (both) opened. all PV opened.
c) we open SDV in dischhurge line. then push "start motor".
d) open SDV in suction line
loading:
e) when we will get P>=0,55MPa we can "LOAD". ----> SDV in recycling lines closing. (LL-0,55, L-0,57, H-0,63, HH-0,66)
f) all PV and SDV (10039) in suction (2) - in automatic mode.---->automatic regulating.
Do I understand correctly. that suction PV (10001A) and 10003A regulates pressure downstream and can ADD pressure in case if they are opened not for 100%. if they are already opened 100%, but we need to correct suction pressure in this case recycle lines PV will provide regulation? (10001B, 10003B) as I understand when SUCTION lines will provide proper pressure and suction PV will be opened
unloading:
g) please advise.
Normal shutdown:
- motor stopped
suction SDV (10037, 10039) - closed
- discharge SDV 10042- closed
- all PV opened
- recycle lines SDV - i suppose opened.
I understand that it's little bit messy....but i will be glad to any response.
Attached Files
Edited by Sergio777, 02 December 2016 - 04:46 PM.