Ch14 training guide

ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL 14 Form Issue Date Approved : : : : GOM 002 05-05-02 M.J.R DECK OFFICERS TRAINING ON THE S-TYPE VESSELS 14.1 SYSTEM FAMILIARISATION Confirmed System split into liquid, vapour, condensate and blow-off layout Separate heat exchanger, booster pump configuration Understand the function of the condensate system and basic operation of LPG plant For cargo tank atmosphere change NH3 Ammonia sequence use N A I L N - NH3 Ammonia A - Air I - Inert Gas L - LPG The Golden Rule: At any operational meeting and at any system set up always use manuals and line diagrams Comments: /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL Form Issue Date Approved : : : : GOM 002 05-05-02 M.J.R 14.2 PROCEDURES A LINE UP I DRAIN SYSTEM i) All valves to be closed Dependant upon cargo, liquid system drained into a tank or overside using ii) flexible hoses connected to collector tank iii) Liquid to be drained into either tanks No… Dead end draining to be carried out by use of blank drain valves if fitted or breaking flange (Ensure fire main charged and hoses operating Use of safety iv) equipment i.e masks, gloves and goggles LPG compressor room door closed and bridge informed ) Line up system as discussed in operational meeting Line up carried out by chief v) officer and checked out by other officer Confirmed /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL Form Issue Date Approved : : : : GOM 002 05-05-02 M.J.R Comments: B TANKS & LINES WARM UP (HOT GASSING) Confirmed i) Power available for machinery to be used ii) Line up system as discussed per operational meeting iii) Tank pressure adequate for operation Line up compressor for vapour suction and condensate line delivery iv) Hot gas valve to remain closed until LPG compressor loaded up v) Before tank warming, warm liquid lines to ensure liquid free Warm vapour being returned to low condensate line initially and stripping line vi) when liquid free vii) Bring tank temperature upto ambient temperature (appx +20 degC) viii) Use of tank temperature graphs- indication of tank warming and when liquid free Comments: /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL Form Issue Date Approved C DEPRESSURISING CARGO TANKS Air conditioning on recirc mode and vents closed PA announcement to initiate in i) port restrictions Pressure to be released slowly to avoid temperature drop and consequent possible ii) condensation Tanks to be brought down to slight over pressure (0.05 bar) iii) Whilst depressurising, ER requested to start up IG plant and venting to funnel iv) Use forward vent masts for venting off /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc : : : : GOM 002 05-05-02 M.J.R Confirmed Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL Form Issue Date Approved : : : : GOM 002 05-05-02 M.J.R Comments: D INERT GAS / FRESH AIR Confirmed i) All v/v to be closed (With Ammonia cargo vapours are replaced by air, not IG) After depressurising cargo tanks, IG bend to ER to be connected All Void space ii) and deck fan valves to be firmly closed Line up system as per operational meeting/line diagram IG into vapour line and iii) tank atmosphere exhaust via liquid line to forward vent masts Open IG deck valve and request IG to deck IG initially to vent masts until quality iv) acceptable before introducing into tanks During initial period, check IG and tank temperatures (IG temperature normally lower than tank, If tank bottom temperature falls rapidly, this may indicate loss of v) interface and possible condensation) vi) Check void spaces for pressurisation by use of void space safety valves (Increased pressure indicates leaking valves thus protracted operation) Regularly monitor tank atmosphere using gasscope until LEL readings indicate 0% and then continue for a further two hours Also check IG oxygen levels (Additional hours used for inhibited cargoes to prevent formation of deposits vii) when fresh air is introduced For previous VCM, remember not to use meter on %gas due to damage to element) Tanks may be fresh aired either by IG blower or deck fan dependant upon relative viii) humidity (max 70%) * Whether using IG blower or deck fan for venting tanks, recommend air in top ix) and monitor oxygen readings throughout When bottom oxygen readings nearing 15% commence exhausting intermittently x) through cargo pumps When bottom readings are 21% oxygen, open access lids and use Drager tubes to xi) monitor ppm Sample points to remain closed when not in use, especially important with xii) Butadiene to prevent blockage NB If gas freeing from VCM, recommend use of deck fan until below 10 ppm IG blower may be used afterwards to dry the tanks Continuo ventilation as ppm will rise once ventilation stopped Comments: /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL E Form Issue Date Approved TANK ENTRY, INSPECTION, & CLEANING i) Maintain ventilation throughout procedure ii) Follow "Permit to Work guidelines and Master/Bridge informed prior entry Initial entry carried out by Chief officer wearing breathing apparatus to carry out iii) frill test of oxygen and ppm content Readings relayed to Standby man/Bridge Once all tanks safe for entry and documentation completed, ship staff may enter iv) for cleaning Tank inspection by ship staff to include but not limited to the followinga) General condition of inner tank surface especially in dome space and checking for rust and light scale b) Sump area clean and free of debris c) Loading line internal surface clean d) Pump turns freely and all securing arrangement in place e) Enraf gauge bottom clean, float undamaged, full travel Verify top and bottom v) readings f) Sample points clear and blown through with nitrogen as required g) Check after bay for inhibitor staining also around lightening holes on all partial/perforated bulkheads h) Condensate lines holes clear and end caps secure j) Start up line nozzles all in place k) Welded connections for fracturing and perforated bulkhead for rotation chocks L) 95% & 99% alarm checks When alongside, surveyor carries out tank inspection and Cleanliness certificates vi) issued Some terminals require own Safety officer to carry out pre-entry checks vii) : : : : GOM 002 05-05-02 M.J.R Confirmed If ship to arrive at load port with tanks under ship's 1G Master may be required to carryout inspection and issue Cleanliness certificate GOLDEN RULE - WHAT GOES IN COMES OUT Comments: /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 ZODIAC MARITIME AGENCIES LTD GAS OPERATIONS MANUAL Form Issue Date Approved : : : : GOM 002 05-05-02 M.J.R F SECURING & NITROGEN PURGING GOLDEN RULE - WHAT GOES IN COMES OUT Confirmed i) ii) iii) iv) v) vi) vii) viii) ix) x) xi) xii) xiii) xiv) Ensure all tanks clear and no items left behind New joints fitted Fibre joints used for all cargoes except for P.O when non-asbestos metaflex* gaskets must be used Secure tank lids Check for teaks Ventilation stopped and IG bend to ER disconnected All valves closed Line up Nitrogen through heater then to either vapour or condensate lines Commence nitrogen at low rate (500 cbm/hr) and warm lines only exhausting through vent mast LPG house/liquid manifold (40-60 inns) Once lines warmed (max temp 60 deg C) open vapour valves on tank domes to commence purging operation Run for approx hrs to reduce oxygen content in dome area Maintain slight tank pressure, this not to exceed bar Exhaust from tank through liquid loading tine and pumps Check for tank lid leaks Open upper condensate line and start up line and restrict vapour valve to approx 50% Continuous monitoring of oxygen content at all levels to ensure interface maintained Increase rate gradually over hrs to maximum of 1200cbm (tksl+3), l500 cbm (tks 2+4) When bottom readings less than 2% oxygen increase rate to maximum available Vapour valve and lower condensate lines may be opened fully Continue until tank oxygen reading are at required level Rate to be reduced as tanks are completed Upon completion pressurise tanks to >0.2bar especially if sea passage to load port, where pressure should be a approx 0.5 bar /storage1/vhost/convert.123doc.vn/data_temp/document/wxi1554800581-1959494-15548005812433/wxi1554800581.doc Page of 22 NB When operating on 1+3 system max rate appx l200cbm due to tank configuration Max rate to No.1 tank approx 3SOcbm Interface is easily lost in No.1 tank If interface is lost, purging operation to be stopped for approx 1hour and then restarted at low rate and increased gradually again If nitrogen purging tanks l&3 in series with tanks 2&4, rate to be reduced when oxygen content reduction noted at bottom of the first set of tanks This will assist in obtaining interface on second set of tanks When 2% oxygen attained at bottom sample point, rate is now for dilution and maximum rate may be used If oxygen reading fluctuate when below 1% oxygen (10000 ppm) start using Teledyne meter Comments: G i) ii) iii) iv v) vi) vii) TANK CONDITIONING AND COOL DOWN All valves closed and systems secured Cross tree bends and Vapour/Condensate bends to be removed ER advised of power requirements Three main methods; a) Shore supply cargo vapours b) Shore supply cool down parcel nominated by vessel Tank conditioning carried out either at berth or at anchor c) Conditioning cool down whilst loading Reference made to manuals for different product conditioning Monitor tank condition throughout operation For cool down refer to Port/Charterers requirements and Guidelines for Cargo Handling Once sufficient liquid level in all tanks, cargo pumps may be mn and even temperatures obtained by re-circulating liquid through start-up line and condensate lines Vessel to remain at even keel throughout (This will ensure that accurate product loss may be obtained) Confirmed Comments: H LOADING i) All valves closed and ER advised of power requirements Line-up system as per line diagram and operational meeting Line-up to be checked by duty officer and Chief officer carry out final check before ii) loading commences iii) Commence loading at low rate and carry out line checks Once lines proved, increase gradually to maximum rate for system in use, and iv) lines checked again All normal loading to go via cargo filters,( these only bypassed during v) conditioning when using cargo heater on reverse flow Once conditioning completed revert back to normal loading.) If liquid samples required, pumps to be run for approx 20mins on re-circulation vi) prior to taking samples In case of Butadiene or VCM only load one tank at a time when inhibitor being vii) added terminal will advise which tank to load All other tank valves to be closed viii) LPG compressors on-line as soon as possible to maximise uplift Comments: J Confirmed CARRIAGE Confirmed i) Cool down cargo as per charters requirements Cargo pumps to be turned twice daily when cargo temperature < + C This ii) especially for CC4 and Raflinates due to moisture content in cargo iii) Leave at least one tank open on liquid line system for draining liquid lines iv) Incondensibles to be either vented off or returned to one tank v) Condensate return/Vapour suction on only one pair of tanks at a time With Butadiene if plant is off for extended periods (24hrs plus) then liquid to vi) be circulated as per operational manual and condensate system in LPG house to be drained back to tank Comments: K DISCHARGE Confirmed All associated alarms and checks to be carried out at least 24hrs prior to arrival ii) Prior berthing all valves closed Line up system as per line diagram and operational meeting ER advised of iii) power requirements iv) When terminal ready, pumps started on frilly re-circulation v) Line checks once discharge is commenced to shore vi) Increase rate gradually as per shore requirements When running all pumps on tanks & without booster pumps, pumps vii) will need to be adjusted by re-circulation in order to avoid pumps tripping out on low flow For stripping purposes vessel to be trimmed as follows; Tank No even keel –20 cms by stern viii) tanks & even keel tanks No 0-20cms by head Comments: i) PORT PAPERWORK A CLEANING Confirmed i) Permit to Work ii) Surveyors/Masters tank Cleanliness certificate iii) Segregation certificate iv) Tank Oxygen content certificate v) Dew point certificate for PPL/VCM vi) Nitrogen usage receipt Comments: B CONDITIONING AND LOADING Confirmed i) ii) iii) iv) v) vi) vii) Loss to flare receipt Ship/Shore safety checklist Pre-loading information and Product Data sheets Butadiene notice Load calculation sheet (Ship and Surveyors) Cargo Density tables Inhibitor certificate for Butadiene and VCM viii) Quality certificate ix) Masters departure telex information x) Loading rate sheets xi) Tank temperature/pressure sheets xii) Cargo Location plans posted Comments: C DISCHARGE Confirmed i) Ship/Shore safety checklist ii) Load port calculation iii) Pre-discharge calculations (ship and surveyors) iv) Post discharge calculations (ship and surveyors) v) Cross Indemnity if ship ESD extension used vi) Maximum out turn notice vii) Masters departure telex information viii) Discharge rate sheets ix) Pump information sheets x Tank temperature/ pressure sheets xi) Inhibitor certificate posted U ( USCG requirements ) Comments: A PLANT OPERATION PUMPS Confirmed i) During loading pumps to be turned by hand until pumps well covered On passage when temperature brought