Atch e_9074.1 SHIPBOARD HOT WORK PRECAUTIONS (E).pdf

DEPARTMENT OF THE NAVY

U.S. NAVAL SHIP REPAIR FACILITY AND

JAPAN REGIONAL MAINTENANCE CENTER

PSC 473 BOX 8

FPO AP 96349-0008

NAVSHIPREPFACINST 9074.1

19 Aug 11

ION 9074.1

NAVSHIPREPFAC YOKOSUKA INSTRUCT

OT WORK PRECAUTIONS

M-010/Chapter 074, Volume 1

F-010

L

Subj: SHIPBOARD H

Ref: (a) NSTM S9086-CH-ST

(b) NAVSEA OP 4

A (c) NAVSEA S6470-AA-S 2002 (d) NFPA 1403-

(e) NAVSHIPREFAC PI510-1A

(f) NAVSHIPREFACINST 5100.8

(g) NAVSHIPREFAC PI8644-901

(h) 29 CFR 1915.55

(i) NSTM 074, Volume 1, Section 10.8

(j) NSTM 074, Volume 3, Section 22 rd Hot Work PrecautionsEncl: (1) Shipboa

(2) Summary of Conditions that Prohibit Hot Work

-Sensitive Materials (3) Stripback Guidelines for Heat ) Quick Reference Tables for Surface Ships (4

(5) Hot Work Chit Routing Process

(6) Hot Work Permit (with Japanese Translation) SRF-JRMC Form 9074/1

(7) Gas Free Requirement Flow Chart

(8) Fire Watch Badge

1. Purpose. To promulgate the U.S. Naval Ship Repa d Japan Regional Maintenance Center (SR ir Facility

F-JRMC), Yokosuka ccordance with ces (a) through (d), this instruction provides basic fire safety precautions for shipboard hot work. Hot work in confined or enclosed spaces, including tanks, voids, trunks, pump rooms, shaft alleys, piping, stanchions, air flasks, masts, etc., is controlled by reference (f) for Gas Free Engineers (GFE), Navy Competent Person (NCP), and direct support staff.

2. Translation an Shipboard Hot Work Precautions instruction. In a referen

. This instruction will be translated into Japanese.

3. Applicability. This instruction applies to all ho performed by SRF-JRMC employees. It does not app performed by ship’s force or contractors, although the subject to similar Naval Sea Systems Command (NAVSEA) t work ly to hot work y are and

HA) regulations.

4. Action

Occupational Safety and Health Administration (OS

. Code 300 is responsible for implementing this

/s/

S. L. STANCY

Distribution:

SharePoint instruction.

SHIPBOARD HOT WORK PRECAUTIONS

1. Purpose. To promulgate the U.S. Naval Ship Repai and Japan Regional Maintenance Center (SRF-JRMC), Yoko Shipboard Hot Work Precautions instruction. In accord references (a) through (d), this instruction provides safety precautions for shipboard hot work. Hot work or enclosed spaces, including tanks, voids, trunks, shaft alleys, piping, stanchions, air flasks, masts, etc., is r Facility suka ance with basic fire in confined pump rooms, (GFE), Navy port staff.

controlled by reference (f) for Gas Free Engineers Competent Person (NCP), and direct sup

2. Scope. This instruction applies to all shipboard h assigned to SRF-JRMC and off-site locations.

a. Hot Work is defined as all flame heating, wel cutting, brazing, carbon arc gouging, or any work whi heat, by any means, of 400ºF (204º C) or more. In the various OSHE requirements included, there are requirements for containments, protection of comb flammable liquids from Hot Work, inclu ot work ding, torch ch produces addition to methods and ustibles and ding specific examples of ontainment materials, fastening methods, sealing . The enclosures to this instruction include a

-back rence aft Carriers.

acceptable c methods, etc summary of conditions that prohibit Hot Work, strip distances for Heat Sensitive Material, and “Quick Refe Tables” –for Surface Ships/Aircr

3. Definitions

a. Hot Work. All flame heating, welding, torch brazing, carbon arc gouging cutting, , or any work which produces heat, by spheres, or arc tools or equipment, static discharges, friction, impact, open flames or embers, and non-explosion proof lights, fixtures, motors, or equipment.

b. Grinding any means, of 400º F (204º C) or more.

NOTE: In the presence of flammables or flammable atmo hot work includes other ignition sources such as spark producing

. Grinding is not considered hot work unless done in the presence of flammables. In the event grinding is to be conducted and there is unidentifiable fluid present (cannot confirm if material is flammable), request Code 106.2 evaluation immediately.

NOTE: Grinding operations in hazardous environments (presence of flammables) requires that a fire watch be posted.

c. Thermal Cutting. A collective term for p use a high temperature (several thousand degrees rocesses that F) to cut metal. This includes oxyfuel cutting, plasma arc cutting, carbon arc cutting, and gouging.

d. Hot Work Operator (Hot Work Mechanic). A work.

e.

nyone doing hot

SupervisorHot Work . A person properly trained and cordance with ned can sign responsible for safety of hot work operations in ac this instruction. Any foreman who is properly trai the Hot Work Permit.

f. Fire Watch. A person specifically trained fires, to provide continuous surveillance for Hot W during hot work operations, as we to PREVENT ork Safety ll as to extinguish fires and manage emergency response to hot work situations.

g. Fire Marshal. Member of Ship’s Force res coordination of hot work on the ponsible for vessel.

h. Hot Work Council. At a minimum representatives from and/or Shop 26, Shop 11, Shop 56, Code 106.2, and Code 300 will meet monthly to discuss safety concerns, lessons learned, anything pertinent to hot work at SRF.

i. Combustible. Capable of catching fire and burning (i.e., Ensolite, rubber, wood, etc.).

stible Liquid

j. Combu . Any liquid having a flash point at re having gher, which me of the

Flammable Liquid or above 100°F (37.8°C). This includes any mixtu components with flash points of 100°F (37.8°C) or hi make up a total of 99% or more of the total volu mixture.

k. . Any liquid having a flash point below 100°F (37.8°C).

l. Hot Work Containment. A system of containment that forms a barrier around the hot work site to prevent hot sparks and weld spatter from coming into contact with combustible materials. The containment system erected is governed by the type of hot work being accomplished and the specifics of the work site.

Enclosure (1) 2

m. Confined Space. A space which, by design, h or restricted openings for entry and exit, lacks natu ventilation, and may contain or produce hazardous con or have oxygen deficiency or enrichment. Confined sp not intended for normal continuous personnel occupan as limited ral taminants, aces are

cy. Tanks, voids, cofferdams, and double bottoms are examples of confined spaces.

n. Enclosed Space. A space which, by its is of such shape, depth, or other feature that nature or design, natural and ventilation or the natural movement of air is restricted (i.e., open top storage tanks, degreasers, dip tanks, pits trenches).

o. Poorly Ventilated Enclosed Space. An enclosed space which, because of a lack of air exchange/filtration and/or the introduction or presence of toxic, flammable or combus materials, can easily be or become hazardous to person entering or working in the space.

tible nel

p. Incipient Fire. A fire in the initial or be stages, which can be controlled or extinguished by a a portable fire extinguisher, without the need for firefighting equipment.

ginning person with protective

q. Flame Resistant. Flame Resistant (FR) materials will not support combustion when the source of ignition i Inherent flame resistance does not rely on chemical and does not wash out. Natural wool and synthetic inherently FR. FR materials will melt and/or burn, self extinguishing.

r.

s removed.

additives

Nomex™ is but they are

Hot Work in Way of Flammable Liquid or Gas.

heating, gas welding, brazing electric arc

Flame cutting or welding, 400°F (or a known ignition temperature), friction impact metal grinding, electrostatic discharge, and the are examples r gases.

ification of fuel tanks and fuel piping must be conducted by a Code 106.2 GFE. Reference (f), is the controlling document for all gas free issues for workers and supervisors.

4. Equipment heating to operation of ordinary hazard electrical equipment of ignition sources of flammable liquids, vapors o Cert

a. The following is a general list of equipment used in shipboard hot work safety. Equipment is not limited to this list:

Enclosure (1) 3

(1) Water fire extinguisher, 2½ gallon pressurized type

(minimum 5 shers shall not be used in confined or poorly ved in each or general

, Americal National Standards ication

SH-approved for specific job preferred, or minimum ¾” inch water hose

(2) CO2 (various capacity) fire extinguisher lb.) CO2 extingui ventilated enclosed spaces unless specifically appro instance by the GFE

(3) Standard personal protective equipment f shipboard work

(4) Shaded eye protection Institute (ANSI) shades 2 to 14, as appropriate

(5) Two-way radio commun

(6) Respirator protection, O

(7) Flame resistant coveralls

(8) Mechanical exhaust ventilation

5. Material

a. The following is a general list of material used in shipboard hot work safety. Material is not limited to

(1) RefrasilTM silica (silicon dioxide) cloth, 24576, Type I, Class 1, cloth, satin, thermal barrier 39 oz. Wt., 36 in. wide by 5 this list:

MIL-C-

type, 31-

0 yds. Long tant, silica , cloth, thermal barrier type, 31-39 oz. Wt. (such as HITCO Refrasil MIL-C-24576, icone coating, UC100-96BCS/2)

(3) Fabri CoteTM silicone coated fibrous glass cloth, MIL-C-24576, abrasion resistant cloth, welding blanket/curtain, 30-36 oz. Wt. (such as Fabri CoteTM 6484/38 silicone coated fiberglass, MIL-C-24576)

(4) Zetex fiberglass cloth with proprietary rubber coating (Salmon Cloth)

(2) RefrasilTM silicon coated, abrasion resis (silicon dioxide) cloth, MIL-C-24576, Type I, Class 1 satin, modified with silicone coating both sides, Type I, Class I, coated with Fabri CoteTM 501 Sil HITCO product code

Enclosure (1) 4

(5) Flame resistant tape, i.e., MIL-1-19166, NSN-5970-

) Aluminum silicate insulation blanket, ½” thick hick (OmniSil or PyroSil plywood

12) Glass cloth tape (3M #361) th otection

00-814-9606

(6 (“wetpack”)

(7) Silicon dioxide cloth, ¼” t

SNM)

(8) Nochar P215 thermal blocking paste

(9) FRX flame resistant

(10) KevlarTM cloth

(11) 4” RefrasilTM cloth tape

(13) Wire mesh fencing, thin gauge (used to fashion a containment framework to be lined with the above clo materials)

(14) Sheet metal or plate

6. Occupational Safety, Health, and Environmental Pr .

rements

a. Minimum Health and Personal Safety Requi . “Safe a minimum, all against a confined space (i.e., a tank) ification cian) prior losed for Hot Work” Confined Space Certification. As hot work performed in or or a poorly ventilated closed space is subject to cert by a GFE or a Navy Competent Person (gas free techni to the start of hot work as per reference (f).

b. Working in Confined and Poorly Ventilated Enc Spaces and Isolated Locations

(1) Communication. When personnel work in a c poorly ventilated enclosed space, someone outside the onfined or space shall perform frequent checks on them. Communications between personnel outside the space and personnel entering and working in a confined or poorly ventilated enclosed space shall be established and maintained. The type of communication (such as voice, signal line, or electronic means) and the frequency of contact (such as continuous or periodic check) shall be determined by either the GFE or Hot Work Supervisor based on the nature of the space, the operations, and the degree of hazard.

Enclosure (1) 5

Frequency of checks shall be established as to ensure often as necessary the safety of the employees in the space is maintained.

(2) Space Certification. Prior to entering a space or poorly ventilated enclosed space, obta Entry” confined space certificate from a Nav Prior to any hot work in a confine confined in a “Safe for y Competent Person.

d or poorly ventilated ee enclosed space, obtain a “Safe for Hot Work” gas fr certificate from a Navy Competent Person.

(3) Confined Space Egress. Hot work emplo your egress/exit condit yees, check ions before you start hot work in a enclosed ions as more routes k you from in a space, block egress services in a s follows:

shut-off capability (i.e., a he space on a a plug or ice restricts egress.

be used to secure these services from a more remote location.

(g) Supervisors shall stress the importance of responsiveness to each employee involved in this safeguarding of confined space activities.

(h) Give clear instructions for shutting off these services to any guards that may be assigned.

confined or poorly ventilated enclosed space or other space. Ensure that you have appropriate egress condit determined by the following:

(a) Whenever practical, establish two or of egress, removing any obstructions that would bloc escaping to the nearest exit. Appeal to your supervisor if additional authority is needed to accomplish this.

(b) When only one opening is practical take the following egress precautions for hot work:

(c) Stop all other hot work that would to the nearest exit.

(d) Safeguard potentially hazardous confined space a

(e) Obtain immediate valve or quick disconnect), at the entrance to t supply line for oxygen, fuel gas, or inerting gas, and switch for a temporary electric power line if the serv

(f) Radio contact may also

Enclosure (1) 6

(i) Ensure that any ventilation ducting ha that c s joints an be quickly disconnected at the entrance if it obstructs ed Spaces egress.

(4) Ventilation for Confined Spaces and Enclos .

perations closed space, nd remove pace.

for all hot work ion is required when

Where welding, thermal cutting, brazing, or similar o are c nducted in a confined or poorly ventilated eno local exhaust ventilation may be required to capture a contaminants that would tend to build up in the work s

(a) Exhaust ventilation is required in confined spaces per reference(f).

(b) Local exhaust ventilat conducting any of the following in enclosed (non-confined) shipboard spaces:

1. Carbon arc gouging/cutting.

2. Oxy-fuel cutting.

3. Plasma arc cutting.

4. Thermal spraying.

5. Shielded metal arc welding (SMAW).

6. Gas metal arc welding (GMAW) pulse and spray.

7. Flux cored arc welding (FCAW).

8. Brazing (with Grades IV, V and VIII).

9. Heating with rosebud torches.

NOTE: “Local exhaust” implies placing the duct as close as

(5) Hot work operations generating minimal smoke/debris such as non-cad brazing, stud shooting, tack welding, soldering and mechanical cutting generally do not warrant ventilation.

For any other hot work operation processes not listed above, Code 106.2 will make the determination.

(6) Exhaust ventilation shall be utilized for welding processes involving the use of shield gas (i.e., Gas Tungsten practicable to the hot work, in order to capture and remove fumes and gases at their source.

Enclosure (1) 7

Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), dual-shield, ot be space accordance l exhaust e at the k flow of ve this.

te to g partial or fully e ducts are space, equired for dings.

exhaust plication is d downdraft oke/fumes in entilation ysically from other workers (not involved in the hot work ds must be bustion. Spark arrestors and bell mouth end hot work ork with Toxic Fumes etc.) to remove inert gas accumulation.

(a) Where local exhaust ventilation cann provided for the above operations due to location or configuration, dilution ventilation will be used in with reference (c). Capture velocity for loca ventilation should be a minimum of 100 feet per minut source and placed within 6 to 8 inches of the hot wor operation. A 5-inch metal duct requires an air-approximately 300 Cubic Feet per Minute (CFM) to achie When properly positioned, a single duct may be adequa control smoke and fumes. However, high fume producin operations may warrant multiple ducts, and even enclosed containments. This is especially true when carbon arcing in enclosed spaces. Containments and multipl not required, but if fumes are accumulating in the ventilation is inadequate.

(b) Mechanical exhaust ventilation is r welding, cutting, and burning conducted inside of buil Welding booths, local exhaust hoods, trunks or metal duct connectors may be used, but the specific ap dependent upon the process (i.e., auto-controlle ventilation for tabletop cutters, thermal spray, etc.). With the exception of light smoke, the accumulation of sm the shop is not allowed. General building exhaust v may be used for control of smoke only in areas ph isolated process).

(c) Hot work ventilation ducts and hoo protected from com fittings maybe used to increase air suction during operations.

c. Other Hot W . Special precautions, otection, shall be taken in accordance tions when the following materials are subjected to hot work:

(1) Toxic Coatings such as respiratory pr with local OSH instruc

. Coatings which may release toxic vapors or fumes upon application of heat.

(a) Nickel

(b) Beryllium

Enclosure (1) 8

(c) Cadmium

(d) F luorine ead ds etals containing significant (>2%) mium ss steel

Cr(VI) may Welding (SMAW), ting, and er than 2% chromium tainless Steel Corrosion Resistant(CRES), Inconel® and ng the above ining ons such as tion shall be these

TAW, stud ing.

NOTE 3: Significant levels Cr(VI) in fume or smoke can be generated when performing any type of hot work processes on surfaces coated with Cr VI containing coatings. Refer to local OSH instructions or contact the local OSH office for guidance.

d. Welding Flash Protection

(e) L

(f) Zinc

(g) Cleaning or degreasing compoun

(h) All m hexavalent

(i) Chro

(j) Stainle

(k) Inconel

(l) Alloy steel

(m) Hard surfacing alloys

NOTE 1: Welding fumes containing Hexavalent Chromium be produced when performing Shielded Metal Arc GMAW, Flux Cored Arc Welding (FCAW), carbon arc cut plasma arc cutting on metals containing great (i.e., S chromium-molybdenum (CrMo) alloys) and when performi listed hotwork processes using filler material conta greater than 2% chromium. Special precauti respiratory protection and local exhaust ventila taken per local OSH instructions when performing processes.

NOTE 2: Due to little or no detectable generation of Chromium (Cr(VI)), this requirement does not apply to G shooting, grinding, and oxyfuel cutting or braz

. Welders shall wear appropriate eye protection. Recommended ANSI shades are

Enclosure (1) 9 indicated in Table 1. Fire watches shall be provided eyewear per

ANSI Z-87.1.

e. Flash Curtains. When practical, welding be used to surround the welding site to prevent inad exposure to arc fl curtains shall vertent ash. Hot work personnel shall perform an evaluation of the worksite prior to starting work to determine use of flash curta

SHADE DENSITY GUIDE

ins.

OPERATION ANSI Shade No.

Air-Arc Gouging 11 to 14

Plasma-Arc Welding & Cutting 10 to 14

FCAW (Flux Core Arc Welding) 11 to 12

GMAW (Gas Metal Arc Welding) 10 to 12

GTAW (Gas Tungsten Arc Welding) 10 to 12

SMAW (Shielded Metal Arc Welding) 10 to 12 Oxy-Fuel Cutting Light - up to 1” 3 Medium - 1” to 6” Heavy - over 6” or 4, 4 or 5, 5 or 6

Torch Brazing 3 or 4

Thermal Spraying 2 to 4 Soldering 2

Table 1 – Eye Protection for Welding Flash

f. Flash Warning Signs. These signs shall be pos entrance to the ship. Signs warning of the danger of may be posted in the vicinity of any type of arc weld cutting operations or use barriers or flash protec shall me ted at the flash burn ing or tion. Signs et the requirements of the local OSH office.

urn Safety

g. Personal B . Burn injury is a serious personal

E). Proper ng helmet, lothing s with closeable pockets).

7. Quality Assurance risk without proper Personal Protective Equipment (PP PPE for burn protection may include a full-face weldi high-cut shoes, welding gloves, and flame resistant c (i.e., leather pants, cuffless coverall

a. Production Shop supervisors will ensure that people who work by this instruction are familiar with its requirements and methods. Monitor work in progress and inspect completed work as required by local quality control instructions.

Enclosure (1) 10

8. Training/Skill

a. Hot Work Process Training. Responsible Traini Manager shall establish a training plan for this inst applicable Training Instructions. Knowledge Retention (KRT) regarding the contents of this instruction wil provided at least annually by Code 339 to all produc For those shops that regularly perfo ng Program ruction per Training l be tion shops.

rm/supervise hot work, KRT training shall be performed at least twice a year. Long range plans should reflect these requirements.

b. Fire Watch Training. Fire watch training shal all information in paragraph 9.q. Conduct fire watch annually. Fire watch training shall include live fire extinguishing scenarios. Live fire exercises shall be conducted l contain training nce with reference (d), NFPA 1403-2002 Standard Live and local requirements and ordinances, in accorda Fire Training Evolutions, as applicable.

9. Methods

a. Interaction with Ship.

(1) Hot Work Agreement. No hot work shal active ship until a written agreement is in place b ship and SRF-JRMC l start on an etween that concerning hot work. This agreement is typically titled Memorandum of Agreement (MOA) or Standard Work Practice (SWP).

(2) Hot Work Notification. Enclosure (4) ind which proces icates ses require notification to Ship’s Force prior to performing hot work.

(3) Duty Fire Marshal. Is responsible for Section 4 of the Hot Work Permit (enclosure completion of (6)). On the Hot vide a ork actions have

(a) All fire hazards have been removed or reduced and meet the requirements of safe for hot work operations per reference (i) and applicable shipboard instructions.

(b) Hot work preparations are satisfactory and meet requirements as outlined in reference (j) and applicable shipboard instructions.

Work Permit, the Duty Fire Marshal will verify and pro signature assuring the following safe for hot w been completed, Enclosure (1) 11

(c) All adjacent spaces inspected and co are satisfactory for hot work and meet the requ for hot work operat nditions irements of safe ions per reference (j) and applicable shipboard instructions.

b. Hot Work Safety Requirements

(1) Conditions That Prohibit Hot Work. Th are tabulated in enclosure (2).

ese conditions

Liquids (2) Protection of Combustibles and Flammable from Hot Work.

(a) Flammable Liquids. Hot work is neve in the presence of a flammable or combustible liquid.

CAUTION: It is the hot work operator’s and fire watch responsibility to be alert to individuals carrying a f r permitted

’s lammable lear of the hot work perators ibles. They each other.

liquid into the hot work area. Steer them c area. There is dual responsibility between hot work o and the trades that use flammable liquids or combust are both responsible to stay at a safe distance from

(3) Relocate or Protect Combustibles. Where practicable, relocate all combustibles at least 35 fe work site.

et from the Where relocation is impracticable, protect

(c).

s from going nt at overlaps t a large pile of combustibles with metal or guards and curtains or containments constructed of flame resistant material per paragraph Tighten edges of covers at the deck to prevent spark under the covers. This precaution is also importa where several covers are used to protec combustibles.

(4) Protect Equipment. Protect intricate an machinery and equipment from falling sparks or other p sources of fire with metal guards or curta d vulnerable otential ins constructed of flame resistant material per paragraph (c). Secure the protection in place before commencing hot work.

(5) Protect Openings. For hot work processes that generate slag, weld spatter or sparks, protect or barrier openings in decks, bulkheads or overheads within 35 feet which can be a path, in order to prevent ignition sources from passing into adjacent compartments, spaces or decks below.

Enclosure (1) 12

(6) Protect Ducts. Shield or otherwise s ship’s ventilatio uitably protect n exhaust ducts that might carry sparks to distant combustibles.

(7) Protect Combustible Construction. When hot work is ignition.

done near decks, bulkheads, partitions or overheads of combustible construction, take precautions to prevent

(8) Protect Pipes. Do not undertake hot work or other metal in contact with insulation or combustible decks, on pipes lose enough bulkheads, partitions, or overheads if the work is c to cause ignition by heat conduction.

c. Hot Work Containments. When hot work products (i.e., dust) need uipment, e type of e following:

ucted of metal or protected FRX

(d) Ship’s structure rapes, protect all sparks or fire tected n inside

NOTE: Protection is only required for shielding combustibles in the direction of the sparks/fire stream. Hull cuts or carbon arc gouging may require an enclosed containment for spark protection in multiple directions, but for small scale grinding/welding, a short 2-sided drape may be adequate to shield material on the deck plate a few feet away. However, the hot worker has to know where the sparks are going and make sure they are adequately contained (in the horizontal and vertical sparks, slag, weld spatter, fire stream or grinding to be isolated from other workers, combustibles or eq fabricate a protective containment.

(1) Choose the containment system to suit th hot work being accomplished and the specifics of the work site.

Containment systems can include one or more of th

(a) Burn box constr flame resistant plywood

(b) Vertically hung curtains erected around the entire hot work area

(c) Drop cloths or drapes

(2) Protect Combustibles within 35 feet. FR d curtains or containments must be used to shield and areas with combustibles that will be impacted by stream. Sparks are not allowed to hit any unpro combustible material or intricate ships equipment, eve containments.

Enclosure (1) 13 direction). Always consider gravity, rebound and ricochet when

The FR cess, and

For inding, but ers must be th fire stream mniSil™ g at close proximity to the n Neoprene ent walls, tely o contain ings, wire ties, be g from d.

be airtight, or ity during Hot Work. Fire tainments to

e. As ents are normally constructed with soft materials, work. Fire ckside of able Containment Materials (preferred constructing a containment or drape.

(3) Ensure Level of Protection is Adequate.

material used must be compatible with the hot work pro prevent fire stream and dross from burning through.

example, FR plastic sheeting is adequate for light gr not acceptable for welding. Heavier thermal barri used for primary containment when hit directly wi or flame impingement. Silicon coated Refrasil™ and O will catch weld spatter and sla weld/cut line, (i.e., 6 inches). However, Salmo coated Fiberglass, which works well for weld containm does not hold up to these conditions.

(4) Ensure Containment Seams/Edges are adequa sealed. Containment seams must be adequately sealed t hot wor roducts. Secure with clamps, hog rk p heat tape, etc. Edges of FR drapes or curtains should tightened at the deck level to prevent sparks and sla passing under and/or into deck openings. This is also important at containment overlaps where several layers are use

NOTE: Hot work containments are not required to fully enclosed.

(5) Check Containment Integr watches should be used in conjunction with con ensure adequate protection of the hot work sit containm containment integrity should be checked during hot watches should periodically inspect the seams and ba your drape/containment for spark leakage.

(6) Accept examples)

TM (a) Refrasil silica (silicon dioxide) cloth (2 layers minimum, more layers if risk warrants, 6” minimum overlap, overlap joint is glued [standard procedure, wire ties are optional], joint protected with Nochar, if necessary). See Material, Section II.

(b) OmniSilTM silicon dioxide cloth, similar product is PyroSil SNMTM by Poly Shield, Inc.

Enclosure (1) 14

TM (c) Nochar P215 The Heat Barrier thermal blocking me resistant plywood al s (a) through (c) above are Man-Made Vitreous Fiber l insulation cal e Fastening Methods (preferred examples) paste

(d) FRX fla

(e) Sheet met

(f) KevlarTM cloth

(g) ZETEX fiberglass cloth (salmon cloth)

NOTE: temI (MMVF) materials, which replaced asbestos in therma applications. Ensure MMVF work is conducted per lo instructions.

(7) Acceptabl s mesh (“chicken wire”)

(8) Acceptable Sealing Methods (preferred examples)

(a) Stud

(b) Tie wires

(c) Magnets

(d) Beam clamps

(e) Wire

(f) RefrasilTM cloth tape y staples

RefrasilTM cloth tape

(e) Stitched/sewn seams

(9) Unacceptable Materials (examples)

(a) Tie wire

(b) Hog rings or heavy-dut

(c) Glass cloth tape (3M #361)

(d)

(a) Plastic films that are not identified as flame resistant (i.e., Visqueen (white film), shrink wrap, and some other clear films).

Enclosure (1) 15

(b) Tie wraps

(c) Tape other than glass (i.e., duct tape)

TM (d) Herculite and cloth (natural or synthetic fiber)

d. Stripback of Heat-Sensitive Materials. Strip requirements are applicable for areas from the point of hot work back maged from sparks, flame or thermal to materials which may be da transfer (refer to enclosure (3)).

(1) Stripback Exceptions

(a) Positive Heat Shielding. When t is not a concern and there is a p hermal transfer ositive means (i.e., structural me from ements may

FE or bulkheads and frames) of preventing sparks and fla contacting built-in combustibles, the stripback requir be reduced. In these cases, approval by Code 106.2 G designated representative is required.

(b) Reducing Process Heat. If minim requirements cannot be met, these distances can be r upon objective evidence (i.e., mock-up testing overse welding engineer). If the temperature will not reach um stripback educed based en by the or exceed for the ion, fire Code 106.2 ist, contact for guidance.

400°F on the opposite side (such as when using controlled heat welding), the requirements pertaining to hot work opposite side (i.e., safe for hot work certificat watch, and insulation removal) may be waived by the GFE. If a controlled welding procedure does not ex cognizant Engineering and Planning Department code

e. Fire Extinguishers. Maintain suitable fire extinguishing equipment of approved types near all h operations. Judge the suitability of the equipment analysis of the conditions at the scene of operation small amounts of ordinary combustible (Class A) the predominant material that could burn, w ot work by an

s. Where materials are ater extinguishers are superior to Carbon Dioxide (CO2). Portable 2.5 gallon pressurized water extinguishers are available through the supply system. CO2 extinguishers are preferable for electrical cables or equipment (class C) fires. In a small space with a very small access opening, however, the operator may not be able to get out quickly in case of fire, and the use of carbon dioxide will be injurious. CO2 extinguishers shall not be used in confined or poorly ventilated enclosed spaces unless

Enclosure (1) 16 specifically approved in each instance by the GFE. Following is plicability: a description of Fire Extinguisher types and ap

(1) Water Extinguishers. Where small amounts ordinary combustible (Class A) materials are the pre of dominant material that could burn, utilize at the minimum a portable 2.5 gallon pressurized water extinguisher.

(2) Carbon Dioxide (CO2). Rated for small C fires (Class B is fires involving flammable liquids, gasoline, paint, and Class C is fires involving electr electronic equipment). Portable CO2 lass B or C i.e., oil, ical or extinguishers will be the ships. Since w cloud, it has or void e an uisher or its.

primary means of fighting incipient fires aboard this agent is discharged in the form of a gas/sno a relatively short range of 3 ft. to 8 ft.

CAUTION: Do not take CO2 extinguishers into a tank space. Discharging into a confined space can creat asphyxiating IDLH condition. Use a water fire exting remain at the access if distance and visibility perm

(3) Dry Chemical. Rated for Class A, B, or C The principal chemical is ammonium phosphate. Dry ch extinguishers contain mildly corrosive materials and be used on active ships or around electronic or elec equipment.

fires.

emical are NOT to trical nstructions on

Sasebo, fire watches d S-56.

or temporary fire main trees) shall be in working order at all times when hot work operations are in progress.

(6) Temporary portable fire extinguishers designated for fire watch purposes shall have tamper-proof seals. If at any time these seals are broken, extinguishers shall be tested, reinspected and resealed prior to being placed back in service.

(4) All CO2 fire extinguishers will have i the side. Carbon Dioxide fire extinguishers (CO2 and water) for use by SRF-JRMC Yokosuka and Detachment will be maintained by Shops X-26, S-11, S-17, S-26, an CO2 Bottles will be inspected just before use.

(5) Ship’s fire protection systems (Fire mains

Enclosure (1) 17

f. Emergency Response

(1) If a Fire Occurs, act quickly but without panic.

put out a fire

Stop work immediately.

Warn other workers in your area.

Call in an alarm or have someone else do this.

Try to extinguish or control the fire (if it does not jeopardize your own safety).

The bullets above show the steps to take if a fire occurs, but your best sequence of actions will depend on the specific place and s you have start.

situation. For a particular job, clear up any question about these priorities with your supervisor before you

(2) If you have used an extinguisher to without involvement by the Fire Department:

(3) Report it to the Ship’s Duty Officer/Fir

(4) e Marshal.

Do not resume hot work until your supervi authorizes it again.

sor ventilated Safe for Hot e tank (for e for Entry to er extinguisher for the purpose of controlling ing a te one to o need to report this

g. Responsibilities for Hot Work Supervisors or Designated

(5) In the case of a confined or poorly enclosed space, evacuate the space and remove the Work gas free certificate. Post a guard outside th asphyxiation hazard). Have the space recertified Saf prior to re-entry.

NOTE: Non-Emergency Water Bottle Exception - If you are performing hot work near insulation, you are required dedic te a wata fire. If you need a second water bottle for pre-wett containment to absorb bouncing sparks, you may dedica prepare for hot work. There is n preparatory use of a pre-wetting bottle.

Representatives.

(1) Perform a review of the technical work document to determine if any special precautions are required. This review shall be done prior to assigning work.

(2) Know what is on the opposite side of the hot work.

Enclosure (1) 18

(3) Inspect and evaluate the job site for com material separation, coating/insulation removal, or material protection. If removal is not feasible, C will specify and inspect the protection or containment system bustible combustible ode 106.2 operation Hot work s unconfined ification by a ent” is e

h) without y adjacent” cannot be defined as a

n. If it is TM, or isor ct and is difficult, the shift, rvisor still has mechanic at sites at hift. Hot work building sites are exempt from opriate ation. Submit hot work permit as delineated in t is contained

(b) A hot work supervisor designated by Code 300/330, shall inspect oxy-fuel, plasma cutting, and carbon-arc cutting and gouging work sites prior to the start of the operation.

(c) Hot work supervisors shall satisfactorily complete G4 initial training provide by Code 106.2 and attend annual Hot Work refresher training conducted by Code 339.

before hot work begins.

(4) Arrange for the hot work or hazardous permit and gas free, “Safe for Hot Work” inspection.

supervisors may not determine if hot work location i immediately adjacent to a fuel tank or pipe in an space. Hot work will require inspection and cert Gas Free Technician or Engineer. “Immediately adjac defined as “the hot work operation could increase th temperature of the tank or pipe (warm to the touc protection.” “Immediatel specific distance and each case requires evaluatio necessary to protect a fuel tank or pipe with Refrasil other FR, or insulating materials, the hot work superv cannot authorize the hot work.

NOTE: The hot work supervisor is responsible to inspe evaluate the site before hot work begins. As this when assigning several welders at the beginning of this duty may be delegated to a lead mechanic (not assigned to the hot work job). However, the hot work supe the responsibility of maintaining supervision of the the work site and must visit each of their hot work least once a s daily pre-work supervisor inspections.

(a) Plan your hot work and get appr authoriz enclosure (5). An example of the hot work permi in enclosure (6).

Enclosure (1) 19

(d) The job site supervisor, or work leade desig r or nee, shall perform an in-process inspection of all hot work y rags, or workplace g hot work, ryone

Cleanliness ductivity.

your personnel to fire hazards in adjacent to your ly away, or ly with a protective material such as flame azardous sites.

(5) Take immediate action to correct hazardous conditions.

(6) Direct your personnel to remove unnecessar paper, wood, oil, etc. Show them what is expected f cleanliness. Even if your personnel are not performin maintain a general state of cleanliness. See that eve pitches in to pick up debris. Cleanliness is one of the most important measures we can take in fire prevention.

is a plus in health, personal safety, morale, and pro

(7) Alert areas. Beware of electrical cables that are exposed work area. Request an electrician to move them safe cover them adequate resistant fabric.

(8) Survey area to ensure no accumulation of h material has occurred.

(9) Review enclosure (2) for conditions that hot work.

prohibit requirements through the

t. If gas , gas free he job is required and should be annotated on

11) Inspect work site, as well as verify and sign the rdance with des after resuming

h. Responsibilities for the Hot Work Operator (Hot Work

(10) Assistance in determination of gas free for individual worksites and jobs can be consulted use of enclosure (7), Gas Free Requirement Flow Char free requirement determination is still undetermined requirement for t the Hot Work Permit (enclosure (6)).

Pre-Work Fire Safety Inspection Check List in acco enclosure (6) prior to starting hot work. This inclu leaving the immediate work site for any reason (i.e., work after a break).

Mechanic).

(1) Personnel Performing Hot Work. Ensure the right precautions are in place before starting hot work. Your responsibility is great. All personnel performing hot work must understand and adhere to all hot work safety requirements and be

Enclosure (1) 20 properly instructed and qualified to perform such Instruction will include safe operation of equipmen precaution against related hazards, and prevention o Operators will comply with the responsibilities, requi and regulations pertaining to hot work. Operators of operations.

t, PPE, f fire.

rements hot work ish. This of the at is no finished.

for all other shipboard work as well. It is all we can h, you will s instruction or local us on entilation, health ormal ensure that are valid and ny hot work is started or continued.

te, as well as verify and sign the ordance with ncludes after resuming equipment will be responsible should a fire occur due to failure to perform hot work in a safe manner.

(2) Clean up your trade litter when you fin includes any grit and other debris. Make each trip out ship count towards taking out litter or material th longer needed. Leave the area clean when the job is Clean-up is required important to the health, safety and productivity of personnel and it is one of the most important measures take in fire prevention.

(a) As a hot work operator or fire watc be required to have readily available either thi an abbreviated hot work safety guide provided by your training organization. Hot work safety guides will foc basic fire safety issues. They will leave v measures, and the details of special operations to f instructions.

(a) Hot work operator is responsible to all hot work approvals and gas free certifications current before a

(3) Inspect work si Pre-Work Fire Safety Inspection Check List in acc enclosure (6) prior to starting hot work. This i leaving the immediate work site for any reason, i.e.

work after a break.

i. Assignment of Fire Watches

(1) Fire watch(es) shall be posted for all hot work except as noted in enclosure (4). They shall remain for 30 minutes after hot work is completed, observing for smoke or flame. If during hot work any of the following conditions are present, a fire watch must be posted:

(a) Slag, weld spatter, or sparks might pass through an opening and cause a fire.

Enclosure (1) 21

(b) Fire resistant guards or curtains ar to prevent ignition of combust e not used ible materials on or near decks, ection cannot

, or otherwise ins.

near onstruction in a space be inerted.

ns or duction or ause ignition pipes, bustible cted . A Marine e Engineer, or a Navy Competent Person her duties while ave a clear in the bulkheads, partitions, or overheads.

(c) Combustible material closer than 35 feet to the hot work in either the horizontal or vertical dir be removed, protected with flame-proof covers shielded with metal or fire-resistant guards or curta

(d) The hot work is carried out on or insulation, combustible coatings, or sandwich-type c that cannot be shielded, cut back or removed, or is within a sandwich-type construction that cannot

(e) Combustible materials adjacent to the opposite sides of bulkheads, decks, overheads, metal partitio sandwich-type construction may be ignited by con radiation.

(f) The hot work is close enough to c through heat radiation or conduction on insulated bulkheads, decks, partitions or overheads, or com materials and/or coatings.

(g) The work is close enough to unprote combustible pipe or cable runs to cause ignition Chemist, Navy Gas Fre requires that a fire watch be posted.

(2) A fire watch must not be assigned ot the hot work is in progress. The fire watch must h view of and immediate access to all areas included assigned fire watch area.

j. Back Side Precaution. When you receive a assignment, examine the area including the backside o surface you’ll be working on. Hot work heats a w job f the ork piece directly on its front side; but a large portion of this heat penetrates to the backside of the piece also. Inspect the backside of your work piece before you start hot work. Use a flashlight and mirror if necessary. Remove any litter that may be there. Clear out any potentially combustible liquid residue or vapors. Ensure heat-sensitive material is stripped back (i.e., insulation, etc.) not only from the front side, but also from the backside when necessary (refer to enclosure (3)).

Enclosure (1) 22

k. Ensure all cables, pipes, valves, system com temporary service equipment are moved out of the way protected with flame res ponents and or istant coverings secured in place with g, pushing, he presence of heat. Use caution if there are w if you have me resistant ks may nt to ensure flame resistant tape or wire.

NOTE: Electrical cables are easily damaged by bumpin bending, and by t cables in your work area. Let your supervisor kno a problem with them.

l. Machinery and equipment must be protected from arcs, flames, sparks and slag with metal guards or fla cloth (refer to paragraph c).

m. Operate your hot work equipment safely, paying particular attention to where flames, slag, or spar travel. Periodically check your shield or containme it remains intact.

n. Ship’s Ventilation Exhaust Duct. Protect du might carry sparks to distant combustibles. Shield duct if necessary, or reroute it if its operations ventilation disrupted.

o.

cts that /protect a cannot have

Break Time. Accidental arcing can easily star or inflict other arc damage to metal if you leave unsecured. De-energize (or discon t a fire equipment nect) your equipment before end of shift).

after the end , or end of ons need to e to ensure that adequate coverage protecting against leaving it for any reason (breaks, lunch, and Fire watches will remain on station for 30 minutes of last hot work action regardless of lunch, break shift implications. Relief of Fire Watch considerati be mad fires as a result of hot work activities.

p. Oxygen and Fuel Gas Precautions. Do not l unattended fuel gas and oxygen hoses and torches spaces. They shall be rolled back to the nearest wel eave in confined l-ventilated areas (such as a passageway, main deck, flight deck, etc.).

CAUTION: Fuel gas cylinders shall not be brought inside any confined or poorly ventilated enclosed space. This includes small hand-held 10 cu. foot capacity gas cylinders. Do not place compressed gas cylinders and manifolds in confined or poorly ventilated enclosed spaces within the ship; locate them

Enclosure (1) 23 on or above the weather deck in an area open to where gas from a leak will be ea the atmosphere, sily dispersed. Aircraft

es. Before auge, ating the gauge hooking up to taking e the same Perform eed a small the torch valve. Observe gauge eakage.

ctory and system can be used aboard ship.

, by whom and be used aboard and torch are s the taken le after

AT).

one space at ed or enclosed e, run any gas lines through a different l access.

heck valve

(3) Follow these tips to avoid uncontrollable highly flammable gas mixtures:

(a) Keep all oxygen equipment completely free from the slightest film of oil, grease, or other combustibles. This includes oxygen cylinders, valves, couplings, regulators, and hoses. Do not handle any of these with oily hands or gloves.

carrier hangar decks are permissible.

CAUTION 1: Use of Turbo Torches in Enclosed Spac assembling the acetylene system, always inspect the g torch, hose, and the torch tip for damage, and all se surfaces for any foreign material that would prohibit from seating properly and thus causing leaks. After torch and gauge, drop test the system for leaks prior it aboard ship. Testing of 10 cu. ft. system will b as performed when installing an oxy-acetylene system.

test in the open atmosphere. Pressurize the hose, bl amount of gas, and then secure for two minutes. If needed, use snoop to detect any l When no pressure drop is observed, the test is satisfa the

CAUTION 2: Ensure the ship is informed where, when for what purpose the small 10 cu. ft. system will ship.

CAUTION 3: Ensure that the 10 cu. ft. cylinder removed from the work site each time the brazier leave compartment. Small 10 cu. ft. cylinders shall not be aboard the ship until they are needed to perform the brazing operation, and shall then be removed as soon as possib the braze joints have been inspected satisfactory (S

CAUTION 4: Use only one 10 cu. ft. cylinder in any one time.

(1) For hot work in a single-access confin space, where possibl route rather than through the only means of personne

(2) Flash arrestor (may be “built-in”) or c shall be installed in line.

Enclosure (1) 24

(b) Do not use oxygen as a substitute for air for ygen and fuel only in a torch or burner ned.

e a cigarette ment such as Prior to caps on blow-down, air tool propellant, etc.

(c) Mix ox designed for that purpose.

(4) Use proper equipment that is well maintai Obtain a standard friction torch lighter. Don’t us lighter to light an industrial torch. Reject equip a hose that has a leak, burn, worn spot or crack.

starting hot work, test all gas hoses using the pressure drop test shown below in section 9p(4)(1). Replace safety gas cylinders after regulator removal.

(a) Pressure Drop Test. Connect torc fuel gas supply and det h to oxygen and ermine whether your set-up is gas-tight

-hand

(6) Open valve on oxygen bottle (always check the oxygen ressure; set ly above

2 test).

3 to 5 ure on od.

ed. Re-ections and repeat Drop Test.

soapy water, ound the fitting(s). Look for bubbles while hose is at the above Pressure Drop Test.

(11) Repeat the above Pressure Drop Test for the fuel gas side of the system (can normally use 5 to 15 psig for fuel gas test).

(a) Do not leave unattended fuel gas and oxygen hose lines or torches in a confined enclosed space. If quick by the following procedure:

(5) Close torch valves. Perform a hand-over inspection of the equipment.

side first, before the fuel side). Check bottle p pressure on regulator to a convenient point slight working pressure (can normally use 20 to 40 psig for O Then close the bottle valve. Charge no more than seconds.

(7) Watch for a measurable drop in gauge press hose side of the regulator over a two minutes peri

(8) If pressure drops, a gas leak is indicat tighten ll conna

(9) If the leak(s) persists, apply slightly on and ar pressurized.

(10) Replace any leaky components and repe

Enclosure (1) 25 disconnect fittings are not used, disconnect torch fr only in a well-ventilated area. Before reconnecting a source, perform a Drop Test (see paragraph (v)), ensu has positive identification an om a hose hose to a re that it d ensure it is current with local tool issue and return date policies.

q. Responsibilities for the Fire Watch.

(1) Since you are the only one strictly respon t be sible to alert and dy to stop a hot work

. You must tart.

watch hot work and the surrounding areas, you mus equipped, know alarm locations, and be rea operator if there appears to be a dangerous condition respond very quickly, if a fire has been allowed to s These parts of your job are of utmost importance.

(2) Fire Watch Positioning at Site. As an o watch, you shall be within 50 feet of all hot assigned to you and have an n-duty fire work operations unobstructed view of all these fixed location.

rs that would ork ea to a continuous atching for all ed to: Eye g protection and It is the have the s a Fire the clear f the Fire Watch Badge (See enclosure (8) operations and their exposed areas from a single You shall have no physical obstructions or barrie prevent your immediate access to the assigned hot w operation(s) should a fire occur.

(3) You shall not move from one compartment/ar another in carrying out fire watch duty in a way that would negatively affect the requirement of maintaining line of sight to all hot work assigned to you.

(a) Do not accept an assignment of fire w more than four hot work operators at one time.

(b) The Fire Watch shall be equipped with necessary PPE. This includes, but is not limit protection of the appropriate shading, Hearin respirator required for the hot work being performed.

responsibility of the Fire Watch to ensure that they appropriate PPE prior to commencing their duties a Watch. Fire Watch is required to be identified by presentation o ) to warn passersby of the possible dangers that are in the area.

(4) Communication. Ensure you have a means of communication between yourself and all other fire…