A07 ATTACHMENT 0035 TE 4.14 Lightning Protection System Maintenance.pdf

TE 4.14 Lightning Protection System Maintenance

REFERENCE:

DA PAM 385-64 Ammunition and Explosives Safety Standards

SCOPE:

Contractor will conduct visual inspection and electrical testing of lightning protection systems. Inspections and testing will be conducted in accordance with the requirements specified below.

REQUIREMENTS:

A. Intervals:

B. Reports:

1) Visual inspection: Visual Inspection Checklist

2) Resistance testing results: Submit on Diagrams for Bldg 25 and 280

3) Reports will be submitted to the KO/COR within 5 business days of inspection/testing completion.

C. Visual Inspection:

1) The LPS visual inspections interval is 12 months.

2) Inspectors will use the Visual Inspection Checklist List and the Visual

Inspection Criteria to conduct and record the inspection.

3) Inspectors will verify components meet the specifications listed in DA PAM

385-64.

4) Any deficiencies will be recorded in the notes section of the Visual Inspection

Checklist.

D. Electrical Tests:

1) LPS earth electrode and subsystem bonding testing interval is 24 months.

2) Testing will be conducted in accordance with LPS Testing Procedures.

Component Visual Inspection

Electrical test Required resistance

Earth electrode system 12 months

(All Bldgs.)

24 months

(Bldgs. 25 & 280)

≤ 25Ω

Lightning protection subsystem (bonding check)

12 months

(All Bldgs.)

24 months

(Bldgs. 25 & 280)

≤ 1Ω

3) Electrical testing instruments must be capable of measuring resistance up to 1 ohm +10 percent. The manufacturer’s instruction manual will be followed to assure proper use of the instrument.

D. Additional Requirements:

1) All individuals participating in visual inspections or testing will complete

“Ammunition 28” coursework (or equivalent) as a minimum. Certification of completion must be provided.

2) Inspections and testing will be conducted by personnel trained in the inspection and testing of LPS.

3) Contractor will provide verification of employee training on LPS inspection and testing prior to work being performed

4) Each test operator will be thoroughly trained in the use of all test equipment and test procedures.

5) Prior to performing visual inspections or testing, the inspector/test operator will report to the workplace designee to inform him/her of the testing and locations of the test to be accomplished.

6) Contractor employees must meet all security requirements for arsenal access prior to scheduled testing/inspection date.

Safety:

1) No testing of lightning protection systems will be initiated when there is evidence, prediction or possibility of an electrical storm in the area.

2) Caution must be exercised when working on roof tops to avoid falls. Do not attempt to perform tests on buildings when the roof is wet or slippery or during high winds.

3) Personnel performing work at levels where there is the potential for falling 6 feet or greater will use adequate fall protection devices and will have received appropriate fall protection training. Fall protection may be achieved via railings, nets, motion-stopping safety (MSS) system, life lines or scaffolding.

4) Ladders used for lightning protection system tests are to be long enough to extend at least 3 feet above the point of ladder support. The base of the ladder will have safety feet. The pitch of the ladder shall be ¼ of the working length of the ladder. Ladders will be so placed as to prevent slipping, or it shall be secured to the structure with ½ inch nylon rope. Stepladders over 20 feet will not be allowed. Ladders will be non- conductive and be of all wood or fiberglass construction. Ladders will be inspected prior to use.

5) In lieu of a ladder, an aerial lift device may be used. Personnel will use fall protection equipment and will properly secure themselves in the bucket (exception: scissor lifts do not require fall protection)

6) To avoid any possibility of an electrical shock, testers will wear non-conductive safety shoes.

Date: Building:

Inspector(s):

Acceptable Yes/No N/A Comments

a. Masts, overhead wires and air terminals are properly supported

b. Down conductors are continuous with less than one-third of strands broken. No sharp bends or kinks. Bends in conductor are minimum 8” radius and a maximum of 90⁰

c. Connections are tight and free of corrosion

d. No part of the system has been weakened vibration or an obvious lightning strike.

e. All conductors and system components are fastened securely to their mounting surfaces and are protected against accidental mechanical displacement.

f. No non-bonded item within side flash distance of lightning protection system or frame of structure

g. LPS components (air terminals and down conductors) are all present, undamaged, and free f

i. Air terminals are at least 24 inches high and extend at least 10 inches above the structure to be protected.

j. Electrical service has surge protection installed

k. There is no visual indication of damage to surge suppression (overvoltage) devices.

m. Metal doors are bonded on hinge side

n. Electrical service is bonded to LPS

o. There have been no additions or alterations to the protected structure that would require

p. All LPS components comply with Table 17-4 (see attached)

Note: Only visible/accessible portions of the earth electrode subsystems will be inspected.

Appendix A – LPS Visual Inspection Checklist

DA PAM 385-64

Date: Building:

Inspector(s):

Acceptable Yes/No N/A Comments

a. Masts, overhead wires and air terminals are properly supported

b. Down conductors are continuous with less than one-third of strands broken. No sharp bends or kinks. Bends in conductor are minimum 8” radius and a maximum of 90⁰

c. Connections are tight and free of corrosion

d. No part of the system has been weakened vibration or an obvious lightning strike.

e. All conductors and system components are fastened securely to their mounting surfaces and are protected against accidental mechanical displacement.

f. No non-bonded item within side flash distance of lightning protection system or frame of structure

g. LPS components (air terminals and down conductors) are all present, undamaged, and free f

i. Air terminals are at least 24 inches high and extend at least 10 inches above the structure to be protected.

j. Electrical service has surge protection installed

k. There is no visual indication of damage to surge suppression (overvoltage) devices.

m. Metal doors are bonded on hinge side

n. Electrical service is bonded to LPS

o. There have been no additions or alterations to the protected structure that would require

p. All LPS components comply with Table 17-4 (see attached)

Note: Only visible/accessible portions of the earth electrode subsystems will be inspected.

Appendix A – LPS Visual Inspection Checklist

DA PAM 385-64

Visual Inspection Criteria

Introduction This appendix provides criteria and procedures for conducting both visual inspection and electrical testing of earth electrode subsystems.

Visual inspection criteria The earth electrode subsystem will be visually inspected only when or where the subsystem is visible. The earth cover will not be removed from the earth electrode subsystem for the sole purpose of inspection.

a. Components will be in good repair.

b. Components will be free of paint or other nonconductive coating.

c. Components will be free of corrosion. Discoloration of materials is not considered corrosion.

d. Components will be free of breaks, cuts, and damage that will affect equipment integrity.

e. All permanent (welded) and semi-permanent (bolted) bonds are in good condition.

f. Components will be securely fastened to their mounting surfaces and protected against movement and damage.

g. There have not been additions or alterations to the protected facility that would require additional protection or testing.

h. Compression clamps are tight.

Visual inspection of lightning protection subsystem Components of the subsystem will be inspected for the following:

a. Subsystem will meet the requirements specified in NFPA 780.

b. Components will not be broken.

c. Components will be in good repair.

d. Components will be free of corrosion. Discoloration of materials is not considered corrosion.

e. Components will be free of breaks, cuts, and damage that will affect equipment integrity.

f. Bonding straps will not have more than 50 percent of the wire strands broken and the remaining portion of the strap will meet the minimum strap thickness and width/cross section requirements of table 17–5.

g. Components will not be weakened by vibration.

h. Components will be securely fastened to their mounting surfaces and are protected against accidental mechanical displacement as required.

i. There have not been additions or alterations to the protected facility which would require additional protection or testing.

TTE 4.14 Lightning Protection System Maintenance

LPS Testing Procedures

1) LPS bonding subsystem Testing will be conducted using the following procedures:

a. Firmly attaching one lead of the ohmmeter to the down conductor where it enters the earth. The earth electrode system will be disconnected when practical. The other lead will then be firmly attached to:

i. Each component of the lightning protection subsystem as depicted in Appendix E and F.

ii. The other down conductor where it enters the earth.

iii. All large metal bodies (a surface area equal or greater than 400 square inches) that are bonded to the lightning protection subsystem.

iv. Each component of all other subsystems on the facility.

b. Meter readings of ≤ 1 Ω on the lightning protection subsystem components are acceptable. If meter readings exceed 1 Ω, the lightning protection subsystem is not acceptable.

c. Record readings on Appendix E for Bldg. 25 or F for Bldg. 280

2) LPS Earth Electrode Resistance Testing

a. The 3-point fall of potential method is only test method recognized by the Army. The 3-point fall of potential method involves the passing of a known current between the electrode under test and a current probe.

The drop in voltage between the earth electrode and the potential electrode located between the current electrodes is then measured.

The ratio of the voltage drop to the known current gives a measure of resistance.

b. Meters. Meters for this type of test are manufactured with either three or four terminals. With a four-terminal meter, the P1 and C1 terminals must be interconnected and connected to the earth electrode to be tested. With a three terminal instrument, connect terminal X to the earth electrode being tested. The earth electrode subsystem will be disconnected when practical. If the earth electrode is directly accessible, connect the C1 P1 terminals or the X terminal of the test meter directly to the earth electrode or interconnecting cable. If the earth electrode is not directly accessible, connect the C1 P1 terminal or X terminal to the lowest portion of the LPS down conductor or a structural ground connection. The driven reference probe C should be driven at the distance (D) from the electrode under test as specified in table B–1. Potential reference probe P is then driven at a point between the earth electrode under test and probe C as specified in table B–1. The test leads should then be connected as shown in figure B–4. Reference probes should be driven to a three-foot depth unless an acceptable reading can be achieved with the reference probes driven to a lesser depth. Operate the test meter in accordance with manufacturer’s instructions to obtain the resistance to earth

3) Record readings on Appendix F and G In all test records, document the details of how the measurements were taken.

4) Earth Electrode Resistance Tests: A maximum resistance to earth value of ≤ 25 Ω is acceptable.

Table B-1

Figure B-4

DateTime

Meter Ground ConditionTechnician Company

LPS subsystem Bldg. 25 ID FY

D o o r

21 20

1 2 3 4 5 6 7 8 9 10 11 12 13 14

15 16 17 18 19 20 21 22 23 24 25 26 27 28

29 30 31 32 33 34 35 36 37 38 39 40 41 42

43 44 45 46 47 48 49 50 51 52 53 54 55 56

57 58 59 60 61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80 81 82 83 84

85 86 87 88 89 90 91 92 93 94 95 96 97 98

99 100 101 102 103 104 105 106 107 108 109 110 111

252627

28 29

36 37 38 39 40

42 43

44 45

47 48 49

52 53 54

59 60 61

73 74

78 79

81 82

868788

101 102 103

108 109

110111

SOUTH

LPS Bond LPS Air Terminal

Earth ElectrodeConductor

V e n t

B o n d e d t o m e t a l d u c t

B a g H o u s e

118 119

121122

125 126

132133134

138 139

141 142

151 152 153

113 114

159 160 161

163164165

166167

173174175

177 178

183 184

112 113 114 115 116 117 118 119 120 121 122 123 124 125

126 127 128 129 130 131 132 133 134 135 136 137 138 139

140 141 142 143 144 145 146 147 148 149 150 151 152 153

154 155 156 157 158 159 160 161 162 163 164 165 166 167

168 169 170 171 172 173 174 175 176 177 180178 179 central

182 183 184 185

LPS Bond LPS Air Terminal

Earth ElectrodeConductor

6 ½” Vent

Door

186 187 188 189 190 191 192 193 194 195 196 197 198 199

200 201 202 203 204 205 206 207 208 209 210

190 191

196 197 198

200201

202 203 204 205

207208

LPS Bond LPS Air Terminal

Earth ElectrodeConductor

211 212 213

214 215 216 217 218 219 220 221 222 223 224 225 226 227

228 229 230 231 232 233 234

221222 223 224 225

230231232233

235 236 237

236235

238 239

238 239

NORTH

Interior Load

Room

240 241

Interior Bonding Points: Rm 154 - Data Acquisition / Range 4 earth electrode system Bldg 25 ID FY

Door

SOUTH

LPS Bond LPS Air Terminal

Earth ElectrodeConductor

EE1 EE2 EE3 EE4 EE5

EE1 EE2

EE3

EE4

EE5

EE23

EE24EE25

EE23 EE24 EE25

Vent

Bonded to metal duct

Bag House

CENTRAL LPS Bond LPS Air Terminal

Earth ElectrodeConductor

EE6 EE7 EE8 EE9 EE10

EE18 EE19 EE20

EE6 EE7

EE8

EE9

EE10

EE18

EE19

EE20

EE21

EE22

EE21 EE22

6 ½” Vent

Door

LPS Bond LPS Air Terminal

Earth ElectrodeConductor

EE11 EE12 EE13

EE14 EE15 EE16 EE17

EE11 EE12 EE13

EE14EE15EE16EE17

NORTH

lps system Bldg 280 ID FY

EE2 EE3 EE4

SouthNorth

East West

1 2 3 4

5 6

EE1 EE5

EE6

9 10 11 12

13 14

EE7

15 16

17 18

3 4 5 6 8 9

11 12 13 14

17 18

EE2 EE3 EE4EE1 EE5

EE6 EE7

LPS Bond LPS Air Terminal Earth ElectrodeConductor

19 20 21 22 23 24 25 26 27

28 29 30 31 32 33 34 35 36

2122232425

28 29 30 31

33 34

37 38 39 40

37383940

41 42

LPS Bond LPS Air Terminal Earth ElectrodeConductorN