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IP 14-3-1 H HISTORY BACKGROUND DOCUMENT

Page 2 of 4 Fireproofing

Rev. 1 June 2000

THIS INFORMATION FORAUTHORIZED COMPANY USE ONLYEXXON RESEARCH AND ENGINEERING COMPANY FLORHAM PARK, N.J.

INTERNATIONAL

PRACTICE

FIREPROOFING APPLICATION - VESSELS

VESSELS AND EQUIPMENT CONSTRUCTED OF LOW MELTING POINT MATERIALS

S [H] 5.1 Low melting materials represent higher risk than steel and, therefore, require fireproofing. This paragraphdefines locations where fireproofing is required.

S [H] 5.2 Plate and frame exchangers represent a higher risk because of the low-melting point gaskets between theplates, and, therefore, a special protective enclosure is required. This paragraph defines locations wherefireproofing is required.

STEEL VESSELS

S [H] 5.3 Vessels which have large inventory of flammable liquid and which are not readily accessible for fire fightingrequire fireproofing to prevent failure due to fire exposure.

S [H] 5.4 Multiple vessels have an increased fire risk and passive fire protection (fireproofing) is considered superior.

S [H] 5.5 Provides additional fireproofing requirements based on special risk situations.

FIREPROOFING APPLICATION - STRUCTURAL MEMBERS

SUPPORTS FOR VESSELS, INCLUDING PRESSURE STORAGE SPHERES AND SHELL AND TUBE EXCHANGERS

S [H] 6.1 Defines the extent fireproofing should be provided for structural supports to assure that vessels dont fallover andescalate the fire.

S [H] 6.2 Clarifies that the major structure has to be fireproofed even when an individual vessels immediate supportmay not require fireproofing.

S [H] 6.3 To permit inspection of the welds in high stress areas.

S [H] 6.4 Defines the extent fireproofing is required for various vessel structural supports. The paragraph notes thatsome structural supports do not need to be fireproofed. These exceptions are based on the philosophythat vessels of small capacity and supported on 12 ins. or less, do not need to be fireproofed because thedistance the vessel will fall can be absorbed by the flexibility of the piping attached to the vessel withoutfailure.

S,C [H] 6.5 Failure of the platforms and stairways do not contribute to the severity of a fire and, therefore, do notrequire to be fireproofed.

S [H] 6.6 Defines the requirement for fireproofing the insides of vessel skirts. The insides of vessel skirts only needto be fireproofed in situations where there is more than one skirt opening such that under fire conditions theinside of the skirt will be exposed to the fire due to the chimney effect.

S [H] 6.7 To allow adequate cooling to maintain the skirt and/or vessel integrity.

S [H] 6.8 To prevent corrosion under insulation.

SUPPORTS FOR REFRIGERATED STORAGE TANKS AND SPHERES

S [H] 6.9 To prevent the fireproofing from failing due to thermal shock.

SUPPORTS FOR FIRED HEATER AND ASSOCIATED EQUIPMENT

S [H] 6.10 Requires fireproofing of fired heater supports in cases where the fired heater is handling flammable orcombustible liquids to avoid additional damage from a split tube fire.

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HISTORY BACKGROUND DOCUMENT IP 14-3-1 H

Fireproofing Page 3 of 4

Rev. 1 June 2000

THIS INFORMATION FORAUTHORIZED COMPANY USE ONLYEXXON RESEARCH AND ENGINEERING COMPANY FLORHAM PARK, N.J.

INTERNATIONAL

PRACTICE

S [H] 6.11 Restricts the amount of fireproofing on the horizontal support beams in contact with the heater floor toprevent overheating during normal operations.

S [H] 6.12 Concern is failure of equipment handling non-flammable materials that may fail if located in a firehazardous area.

SUPPORTS FOR COMPRESSORS

S [H] 6.13 Concern is that elevated compressor supports may fail during exposure to fire.

SUPPORTS FOR PIPERACKS AND PIPES

S [H] 6.14 Experience has indicated that failure of pipe supports has seriously escalated the fires by causing piperuptures. Detailed information on fireproofing for various piping support systems are specified.Fireproofing of pipe support structures should be carried to the pipe support level regardless of height,because experience has shown that the lower piperack levels are not sufficient to shield the upper levelsfrom fire exposure within a fire hazardous area. It is usually not cost effective to fireproof pipe supportsoutside the fire hazardous area.

S [H] 6.15 Experience has indicated that failure of pipe supports has seriously escalated the fires by causing piperuptures. Detailed information on fireproofing for various piping support systems are specified.Fireproofing of pipe support structures should be carried to the pipe support level regardless of height,because experience has shown that the lower piperack levels are not sufficient to shield the upper levelsfrom fire exposure within a fire hazardous area. It is usually not cost effective to fireproof pipe supportsoutside the fire hazardous area. Because its difficult to fireproof rod or spring type supports, fireproofedcatch beams are used.

S [H] 6.16 Experience has indicated that failure of pipe supports has seriously escalated the fires by causing piperuptures. Detailed information on fireproofing for various piping support systems are specified.Fireproofing of pipe support structures should be carried to the pipe support level regardless of height,because experience has shown that the lower piperack levels are not sufficient to shield the upper levelsfrom fire exposure within a fire hazardous area. It is usually not cost effective to fireproof pipe supportsoutside the fire hazardous area.

S [H] 6.17 The base case is to fireproof pipe supports regardless of height, however, it is also recognized thatfireproofing of elevated supports above 75 ft can be costly hence it is necessary to do a detailed costbenefit/risk analysis of these situations.

S [H] 6.18 Failure of the supports of large pipes can result in pipe failures that could escalate the fire.

S [H] 6.19 Do not want to impede thermal expansion because it may result in pipe failure.

S [H] 6.20 Illustrations outline the extent fireproofing is required for pipe supports in a fire hazardous area to avoidmisinterpretation.

S [H] 6.21 Defines criteria for fireproofing air-cooled heat exchanger supports so that they dont fail and escalate thefire. Air-fin supports are fireproofed when there is an increased fire risk, like auto-igniting material (above

600F), the air fin is located in a fire hazardous area, or is located above equipment that containsflammable material.

S [H] 6.22 Defines extent of fireproofing for the air-fin supports.

FIREPROOFING APPLICATION-ELECTRICAL AND INSTRUMENTATION

S [H] 7.1 To prevent failure of wiring due to fire exposure.

S [H] 7.2 Most emergency shutdowns and emergency depressuring systems will have a fail-safe design such thatthey would actuate in case of fire exposure. However, some installations, such as machinery, do not havefail safe systems. In these cases fireproofing is required to ensure operability during fire exposure.

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IP 14-3-1 H HISTORY BACKGROUND DOCUMENT

Page 4 of 4 Fireproofing

Rev. 1 June 2000

THIS INFORMATION FORAUTHORIZED COMPANY USE ONLYEXXON RESEARCH AND ENGINEERING COMPANY FLORHAM PARK, N.J.

INTERNATIONAL

PRACTICE

S [H] 7.3 EBV(D) valves can be located in a fire hazardous area and require fireproofing to be operable in anemergency.

S [H] 7.5 Control devices, such as push buttons, that need to be accessible for non-emergency testing should befireproofed.

Notes:

(1) Each paragraph to identify the Purpose Code(s) of the corresponding paragraph number of the applicable International Practice (IP).

(2) The symbol [H]is used to denote all History Background Paragraphs which are for INFORMATION ONLY.

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