GLOSARIO
1. INTRODUCCIÓN
1.2. Contexto
CAR SEAL
331.
331. What What is is Car Car seal? seal?
Car seal is a safety device used to isolation valves that shall remain Car seal is a safety device used to isolation valves that shall remain normally open (CSO) or normally close (CSC) during plant normally open (CSO) or normally close (CSC) during plant operations, for Safety, Health, Environment considerations.
operations, for Safety, Health, Environment considerations.
Example:
Example:
PRV TSV
PRV TSV isolation valvisolation valves (CSO)es (CSO) Bypass valve of TSV PRV (CSC) Bypass valve of TSV PRV (CSC) 332.
332. What What is is COD? COD?
Control of Defeat.
Control of Defeat.
333.
333. What What is is MOS? MOS?
Maintenance Override Switch.
Maintenance Override Switch.
334.
334. What What is is SCD? SCD?
Safety Critical Device.
Safety Critical Device.
Example:
Example: PRV, PRV, TSV, Interlock TSV, Interlock system transmitter, Safety system transmitter, Safety equipmentequipment devices etc.,
devices etc.,
T A N
T A N K K F A F AR M H A Z A R D R M H A Z A R DS S
335.
335. What What is is the the impact impact of of tank tank hazards? hazards?
Tanks handling flammable liquid constitutes a much greater Tanks handling flammable liquid constitutes a much greater potential fire hazard than the process unit, probably because they potential fire hazard than the process unit, probably because they are fragile and easily damaged by slight over pressure or vacuum.
are fragile and easily damaged by slight over pressure or vacuum.
They do cause damage, loss of material and interruption of They do cause damage, loss of material and interruption of production.
production.
336.
336. What What are are the the emergencies emergencies in in a a tank tank farm farm area? area?
Over filling.
Over filling.
Over pressurizing.
Over pressurizing.
Collapse due to vacuum.
Collapse due to vacuum.
Tank fire due to sinking of the roof.
Tank fire due to sinking of the roof.
Tank fire during Mechanical work.
Tank fire during Mechanical work.
Unusual occurrences (Lightening, Static charge etc) Unusual occurrences (Lightening, Static charge etc) 337.
337. What What are are the the causes causes for for over over filling? filling?
Lack of attention.
Lack of attention.
Errors in level indicators.
Errors in level indicators.
Wrong setting of valves.
Wrong setting of valves.
Change of service.
Change of service.
Gravity filling.
Gravity filling.
Wrong routing of transfer.
Wrong routing of transfer.
338.
338. What What are are the the causes causes of of over over pressurizing? pressurizing?
Receiving of liquid rate is high to tank and the vent is not able Receiving of liquid rate is high to tank and the vent is not able to take the load of this high filing rate.
to take the load of this high filing rate.
Over pressurizing by gas: N
Over pressurizing by gas: N22 valve malfunctioning, the ventvalve malfunctioning, the vent was
was not clnot cleaned. eaned. Or clOr clogged.ogged.
Sudden shower cooled the tank causing it to collapse due to Sudden shower cooled the tank causing it to collapse due to condensation of
condensation of liquid. liquid. PVRV not PVRV not properly working.properly working.
339.
339. What What is is the the purpose purpose of of roof roof drain? drain?
Drain the water during rainy season and avoid roof stress.
Drain the water during rainy season and avoid roof stress.
340.
340. What What is is the the impact impact of of water water on on floating floating roof? roof?
Sinking of roof.
Sinking of roof. Accumulation of rain on Accumulation of rain on the rthe roof creates stresses.oof creates stresses.
341.
341. Reason Reason for for water water accumulation accumulation of of roof roof floating? floating?
Plugged roof drains Plugged roof drains
Plugged roof drain strainer Plugged roof drain strainer 342.
342. What What are are the the hazards hazards expected expected during during roof roof sink? sink?
Exposing petroleum vapor to atmosphere, which might find an Exposing petroleum vapor to atmosphere, which might find an ignition source outside and result in flash back fire to the tank.
ignition source outside and result in flash back fire to the tank.
Environmental problem.
Environmental problem.
343.
343. What is What is the reathe reason son for for tank tank fire during fire during mechanical work? mechanical work?
Accumulation of explosive
Accumulation of explosive material in somewhere. material in somewhere. (gauge hatch le(gauge hatch leg,g, hollow leg support etc.,)
hollow leg support etc.,)
Gas release from nearby tanks.
Gas release from nearby tanks.
344.
344. How How lightening lightening affects affects tanks? tanks?
In case of floating roof tank, small rim fires have caused by vapor In case of floating roof tank, small rim fires have caused by vapor leaking through
leaking through the seals. the seals. The source The source of ignition of ignition was atmosphericwas atmospheric electricity due to lightening in the rainy season.
electricity due to lightening in the rainy season.
345.
345. Reason Reason for for static static electricity electricity during during transfer? transfer?
Pumping rate rather high and lines acquired the charge.
Pumping rate rather high and lines acquired the charge.
346.
346. What What is is TSV TSV and and where where do do we we use use it? it?
TSV (Thermal safety valve) is used to take care of pressure build up TSV (Thermal safety valve) is used to take care of pressure build up due to thermal expansion. It is provided at places where a liquid can due to thermal expansion. It is provided at places where a liquid can remain in blocked up state with no room for expansion due to remain in blocked up state with no room for expansion due to temperature rise.
temperature rise.
347.
347. How How to to avoid avoid static static electricity electricity in in tanks? tanks?
Avoid by keeping pumping rate at lower and avoiding splash filling.
Avoid by keeping pumping rate at lower and avoiding splash filling.