IS 31101: D3101 VERY HIGH LEVEL (DCS)CAUSES OF ACTION:1) LRCSAHH 31101 (Very high level in D3101)2) LSAHH 31102 (Very high level in D3101)3) IS 31102 Active (Very high pressure in D3101 / Very high level in D3102)ACTIONS: 1) OPENS HV 31102B (Bypass of D3101)2) CLOSES HV 31102A after 5 seconds (Feed to D3101)3) Board signalling of IS activeIf interlock IS 31101 is active HS 31102A is not able to open valve HV 31102AIf interlock IS 31101 is active HS 31102B is not able to close valve HV 31102BIS 31102: VERY HIGH PRESSURE IN D3101 / VERY HIGH LEVEL IN D3102 (DCS)CAUSES OF ACTION:1) PRCSAHH 31101 (Very high pressure in D3101)2) LRCSAHH 31103 (Very high level in D3102)3) LSAHH 31104 (Very high level in D3102)ACTIONS: 1) CLOSES LV 31101 (Medium steam to E3102)2) ACTUATES IS 31101 (Very high level in D3101) 2) Board signalling of IS activeIS 31103: P3101A PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31103 (Very low level in D3102)2) ZSL 31104 Open not Active (Discharge Valve HV 31104 is closed)3) JISALL 31101 (Very low power absorption of P3101A) ACTIONS: 1) STOPS P3101A (C3101 feed pumps)2) Board signalling of IS activeIS 31104: P3101B PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31103 (Very low level in D3102)2) ZSL 31104 Open not Active (Discharge valve HV 31104 is closed)3) JISALL 31102 (Very low power absorption of P3101B) ACTIONS:1) STOPS P3101B (C3101 feed pumps)2) Board signalling of IS activeIS 31105: P3101A/B AUTOMATIC RESTART (DCS)IS 31105 causes the stand-by pump P3101B (or A) to start in case the pump in operation P3101A (or B) stops. Interlock IS 31105 should be deactivated in case IS 31103 and IS 31104 are both active.A field installed switch (Auto/Manual) shall be provided for each pump.EASL 31101 (P3101A) and EASL 31102 (P3101B) causes IS 31105.IS 31201: VERY HIGH LEVEL IN C3101 BOTTOM (DCS)CAUSES OF ACTION:1) LRCSAHH 31203 (Very high level in C3101)2) LSAHH 31204 (Very high level in C3101)ACTIONS: 1) CLOSES LV 31103 (C3101 feed) 2) Board signalling of IS activeIS 31202: VERY HIGH PRESSURE IN C3101 (DCS)CAUSES OF ACTION:1) PRCSAHH 31201 (Very high pressure in C3101)ACTIONS: 1) CLOSES TV 31201 (Hexane vapor to E3104) 2) Board signalling of IS activeIS 31203: P3102A PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31203 (Very low level in C3101)2) ZSL 31201 Open not Active (Discharge valve HV 31201 is closed)3) JISALL 31201 (Very low power absorption of P3102A) ACTIONS: 1) STOPS P3102A (C3101 discharge pump)2) Board signalling of IS activeIS 31204: P3102B PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31203 (Very low level in C3101)2) ZSL 31201 Open not Active (Discharge valve HV 31201 is closed)3) JISALL 31202 (Very low power absorption of P3102B) ACTIONS: 1) STOPS P3102B (C3101 discharge pump)2) Board signalling of IS activeIS 31205: P3102A/B AUTOMATIC RESTART (DCS)IS 31205 causes the stand-by pump P3102B (or A) to start in case the pump in operation P3102A (or B) stops. Interlock IS 31205 should be deactivated in case IS 31203 and IS 31204 are both active.A field installed switch (Auto/Manual) shall be provided for each pump.EASL 31201 (P3102A) and EASL 31202 (P3102B) causes IS 31205.IS 31206: P3103A PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31202 (Very low level in D3103)2) ZSL 31202 Open not Active (Discharge valve HV 31202 is closed)3) JISALL 31203 (Very low power absorption of P3103A) ACTIONS: 1) STOPS P3103A (C3101 reflux pump)2) Board signalling of IS activeIS 31207: P3103B PUMP PROTECTION (DCS)CAUSES OF ACTION:1) LRCSALL 31202 (Very low level in D3103)2) ZSL 31202 Open not Active (Discharge valve HV 31202 is closed)3) JISALL 31204 (Very low power absorption of P3103B) ACTIONS: 1) STOPS P3103B (C3101 reflux pump)2) Board signalling of IS activeIS 31208: P3103A/B AUTOMATIC RESTART (DCS)IS 31208 causes the stand-by pump P3103B (or A) to start in case the pump in operation P3103A (or B) stops. Interlock IS 31208 should be deactivated in case IS 31206 and IS 31207 are both active.A field installed switch (Auto/Manual) shall be provided for each pump.EASL 31203 (P3103A) and EASL 31204 (P3103B) causes IS 31208.ES 31209: E3105 TUBE FAILURE (ESD)CAUSE OF ACTION:1) PSAHH 31203 (Very high pressure in cooling water line from E3105)ACTIONS:1) CLOSES XV 31203 (CWR line from E3105)2) Board signalling of ES active