Standard_Item_-_Rotating_Elec_Repair_009-17_FY14.pdf

1 of 14 ITEM NO: 009-17

FY-14

NAVSEA

STANDARD ITEM

ITEM NO: 009-17

DATE: 17 JAN 2013

CATEGORY: II

1. SCOPE:

1.1 Title: Rotating Electrical Equipment; repair

2. REFERENCES:

2.1 Standard Items

2.2 Equipment Technical Manual

2.3 S9086-KC-STM-010/CH-300, Electric Plant - General

2.4 S9086-KE-STM-000/CH-302, Electrical Motors and Controllers

2.5 S9086-KN-STM-010/CH-310, Electrical Power Generators and Conversion

Equipment

2.6 S9086-HN-STM-010/CH-244, Propulsion Bearings and Seals

2.7 S6260-BJ-GTP-010, Electrical Machinery Repair, Electric Motor Repair, Shop Procedures Manual

2.8 S9310-AC-HBK-010, Commutator/Slip Ring Maintenance Handbook

2.9 MIL-STD-1310, Shipboard Bonding, Grounding, and Other Techniques for

Electromagnetic Compatibility and Safety

3. REQUIREMENTS:

3.1 Accomplish preliminary repair preparations as follows:

3.1.1 Prior to disconnecting equipment:

3.1.1.1 Record and retain electrical hook-up data. Record

and retain air gap readings. Record and retain bearing clearances for sleeve bearing equipment only.

3.1.1.2 Inspect couplings for cracks, broken segments, wear, and misalignment in excess of tolerances specified in 2.2.

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3.1.2 Disconnect the equipment electrically and mechanically, using

2.2 for guidance.

3.1.2.1 Matchmark, identify, and retain chocks, shims, shock

mounts, sound damping pads, and other accessories associated with equipment.

3.1.2.2 Record shaft thrust and run out readings.

3.2 Remove equipment including rotating components connected directly to the shaft.

3.2.1 Remove entire vaneaxial and tubeaxial fan assemblies from the duct system and transport to the shop for repair.

3.3 Inspect foundations for cracks, areas of distortion, and

deterioration in excess of 25 percent of the thickness of each member of the structure.

3.4 Submit one legible copy, in approved transferrable media, of a report listing inspection results, missing parts, defective parts, and measurements taken in 3.1 and 3.3 to the SUPERVISOR.

3.5 Matchmark, disassemble, and inspect the equipment removed in 3.2, using 2.2 through 2.7 for guidance.

3.6 Accomplish 500-volt megger insulation resistance test, using Paragraphs 300-3.2.2 through 300-3.2.3, 300-3.4.8, 300-3.4.11, and 300-5.3.7.1 of 2.3 for guidance. Record data.

3.6.1 Disconnect solid-state devices and ground temperature-sensing leads prior to measuring insulation resistance of windings.

3.7 Accomplish a DC resistance test of windings, using a Wheatstone or Kelvin bridge, or with an ohmmeter capable of resolving one milliohm (0.001 ohm). Record phase balance for multi-phase equipment, using Paragraph

5.2.1 of 2.7 for guidance. Record data.

3.8 Accomplish a voltage surge test in accordance with Paragraphs 300-3.5.4 through 300-3.5.5 of 2.3. Record data.

3.9 Accomplish a DC HI POT test in accordance with Paragraph 300-3.5.2 through 300-3.5.2.3.4 of 2.3. Record data.

3.10 Accomplish a Polarization Index Test in accordance with Paragraph 300-3.4.12 of 2.3. Record data.

3.11 Measure resistance value of each winding temperature detector, heater, and heater strip using low voltage ohmmeter. Record data.

3.12 Submit one legible copy, in approved transferrable media, of a report listing results of the requirements of 3.5 through 3.11 to the SUPERVISOR.

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3.13 Clean the equipment and windings in accordance with Paragraphs 300-4.5.1 through 300-4.5.5 of 2.3.

3.13.1 Dry the equipment by placing it in an oven in accordance with Paragraph 300-5.3.2.3 of 2.3.

3.13.2 For motors with a Vacuum Pressure Insulation (VPI) Sealed Insulation System, ensure the motor winding temperature does not exceed 220 degrees plus 10 degrees Fahrenheit (104 degrees plus 6 degrees Celsius) during the drying process.

3.14 Allow to cool to ambient temperature and accomplish a 500-volt megger insulation resistance test, using Paragraphs 300-3.2.2 through 300-3.2.3, 300-3.4.8, 300-3.4.11, and 300-5.3.7.1 of 2.3 for guidance. Record data.

3.15 Accomplish a DC HI POT test in accordance with Paragraphs 300-3.5.2.3 through 300-3.5.2.3.4 of 2.3. Record data.

3.16 Repeat cleaning, drying, and testing in 3.13 through 3.15 if DC HI POT test readings are questionable, or if insulation resistance readings minimum of 500 Meg Ohms for motors with a VPI Sealed Insulation System) are not in accordance with the following:

3.16.1 DC generators and motors (except propulsion and auxiliary generators for submarines) including exciters, Table 300-3-4 of 2.3.

3.16.2 DC propulsion generators and motors and DC auxiliary

generators for submarines, Table 300-3-5 of 2.3.

3.16.3 AC generators and motors other than propulsion, Table 300-3-6 of 2.3.

3.16.4 AC propulsion generators and motors, Table 300-3-7 of 2.3.

3.17 If satisfactory readings are not obtained after the second cleaning, repeat 3.13 through 3.15.

3.18 Notify the SUPERVISOR if satisfactory readings are not obtained after a third cleaning.

3.19 Accomplish a DC resistance test of windings, using a Wheatstone or Kelvin bridge, or with an ohmmeter capable of resolving one milliohm (0.001 ohm). Record phase balance for multi-phase equipment, using Paragraph

5.22 of 2.7 for guidance. Record data.

3.20 Accomplish a voltage surge test in accordance with Paragraphs 300-

3.5.4 through 300-3.5.5 of 2.3. Record data.

3.21 Submit one legible copy, in approved transferrable media, of a report listing winding defects such as opens, grounds, shorts, reversed or unbalanced

4 of 14 ITEM NO: 009-17 coil groups or phases, incorrect connections, cracked or brittle insulation, and loose bands, fillers, wedges, and connections to the SUPERVISOR.

3.21.1 Include test results from 3.14 through 3.17, 3.19 and 3.20.

3.22 Protect the windings and machined surfaces. Accomplish the requirements of 009-32 of 2.1, including Table 5, Line 10, for the equipment housing exterior, including fan(s), and interior and exterior of end bells.

3.23 Inspect and test non-wound rotors for loose or cracked bars, localized overheating, and rubbing in accordance with 2.7. Inspect wound rotors, slip ring leads, and armatures for insulation damage and burns/hot spots. Inspect for loose coils and slot wedges. Inspect slip rings and commutators for damage and for wear limits, using 2.2 for criteria. Record data.

3.24 Inspect and dimensionally measure end bells, frame, rabbet fits, shaft, sleeve and pedestal bearings, keyways, fan and running surfaces for wear, eccentricity, and other defects, using 2.2 for accept or reject criteria, and 2.6 for location and type of measurements to be taken. Record data.

3.25 Inspect brush rigging for cracks, chips, worn areas, distortion, spring condition, and insulating material for cracks and arc paths. Record data.

3.26 Inspect leads and terminal lugs for damage and defects. Identify and tag leads with aluminum wrap-around bands with metal stamped or embossed markings. Record data.

3.27 Submit one legible copy, in approved transferrable media, of a report listing results of the requirements of 3.23 through 3.26 to the SUPERVISOR.

(V) "VARNISH TEMPERATURE, VISCOSITY, AND GEL TIME TESTS"

3.28 Select the proper insulating process based on winding insulation classifications and to meet state or local air pollution standards.

3.28.1 Select varnish methods and material, using Paragraphs 300-

4.5.8 through 300-4.5.8.2 of 2.3 for guidance.

3.28.1.1 Maintain the varnish in accordance with Paragraphs

300-4.5.8.3 through 300-4.5.8.3.3 of 2.3 and the varnish manufacturer's instructions.

3.28.1.2 Maintain a current revision of the varnish

manufacturer's instructions on storage, maintenance, and use of the type of varnish to be applied.

3.28.1.3 Maintain a record of varnish temperature, viscosity

and, for solventless varnish, gel time tests. Tests must show varnish is

5 of 14 ITEM NO: 009-17 within varnish manufacturer's recommendations and have been accomplished in the intervals specified by the varnish manufacturer. The record must also show that the varnish is being stored as recommended by the varnish manufacturer.

3.28.1.4 Delete the requirements of 3.28 through 3.28.1.3 for motors with a VPI Sealed Insulation System.

3.29 Varnish windings in accordance with Paragraphs 300-4.5.8.2 of 2.3 and the varnish manufacturer's instructions.

3.29.1 Do not immerse the leads.

3.29.2 Wipe surfaces that affect assembly, such as rabbet fits and mounting flanges, with a cloth moistened with a solvent after draining and before baking.

3.29.3 Delete the requirements of 3.29 through 3.29.2 for motors with a VPI Sealed Insulation System.

3.30 Remove excess varnish run-off from the component locations described in 3.29.2, after baking. Apply a thin coat of air-dry varnish to metal surfaces exposed by the removal process in accordance with Paragraph 300-4.5.8.5 and 300-4.5.8.6 of 2.3.

3.30.1 Delete the requirements of 3.30 for motors with a VPI Sealed Insulation System.

3.31 Repeat tests described in 3.14, 3.15, 3.19, and 3.20.

3.31.1 Delete the requirements of 3.31 for motors with a VPI Sealed Insulation System.

3.32 Accomplish an AC HI POT test in accordance with Paragraphs 300-3.5.3 through 300-3.5.3.2.9 of 2.3. Record data.

3.32.1 Delete the requirements of 3.32 for motors with a VPI Sealed Insulation System.

3.33 Accomplish a 500-volt megger insulation resistance test, using Paragraphs 300-3.2.2 through 300-3.2.3, 300-3.4.8, 300-3.4.11, and 300-5.3.7.1 of 2.3 for guidance. Record data.

3.33.1 Delete the requirements of 3.33 for motors with a VPI Sealed Insulation System.

3.34 Measure resistance value of each winding temperature detector, using a low voltage ohmmeter. Record data.

3.35 Submit one legible copy, in approved transferrable media, of a report listing results of the requirements of 3.31 through 3.34 to the SUPERVISOR.

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3.36 True the commutator or collector rings. Eccentricity shall not exceed the requirements of 2.8. Resurface or machine each individual collector ring to the same exact diameter to allow symmetrical brush holder to ring clearance spacing. Ensure metal shavings are not permitted to contaminate the rotor or stator assembly.

3.36.1 Each cut shall not exceed 0.010 inch. Finish thickness shall not be less than design wear tolerance as shown in 2.2.

3.36.2 Undercut the mica between the commutator bars with the edge of the mica not exceeding a depth of 5/64-inch below the bars.

3.36.3 Chamfer the bar edges and remove rough surfaces in accordance with Paragraph 7-4.1.3 of 2.8.

3.36.4 Burnish the commutator with a very fine commercial burnishing stone conforming to A-A-58052. Polish collector rings to a mirror finish.

3.37 Accomplish the requirements of 009-15 of 2.1 for each rotating assembly.

3.38 Accomplish the following for the brush rigging:

3.38.1 Disassemble the brush rigging.

3.38.2 Remove foreign matter.

3.38.3 Replace existing cadmium-plated parts with zinc in accordance with ASTM A 153.

3.38.4 Recondition threads of plated parts.

3.38.5 Assemble brush rigging.

3.39 Repair lightly scored areas of frame, end bells, and shaft by manual methods. Recondition threads and fit key to keyway. Step keys shall not be used.

3.39.1 Apply a thin coat of petrolatum to unpainted mating surfaces except for explosion-proof motors, which shall have clean, dry mating surfaces.

3.40 Prepare and refinish equipment. Protect machine surfaces, windings, and nameplates from being painted or otherwise damaged.

3.40.1 Accomplish the requirements of 009-32 of 2.1, including Table 5, Line 10, for each housing, fan, and interior and exterior of each end bell.

3.41 Accomplish the requirements of 009-32 of 2.1 for the foundations of the equipment removed in 3.2.

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3.42 Accomplish the following on equipment having other than sleeve-type bearings unless otherwise specified in the invoking Work Item, using 2.7 for guidance.

3.42.1 Except as indicated in 3.42.1.1 (utilizing Attachment A for guidance), install new bearings, seals, fittings, lock washers, and locknuts conforming to 2.2, using 2.6 and Chapter 6 of 2.7 for guidance.

3.42.1.1 Install Type 111, Class 8 (double seal), bearings in motors meeting the criteria identified in Chapter 6 of 2.7. Only double seal bearings identified in Chapter 6 of 2.7 are acceptable for use.

3.42.1.2 For vaneaxial and tubeaxial fan motors not meeting

the criteria of Chapter 6 of 2.7, if not originally furnished or already accomplished during previous repair, install Type 111, Class 8 (double seal), bearings with a C3 (greater than normal) radial internal clearance in place of the Type 111 bearing originally furnished. Install Type 120 bearings in vaneaxial and tubeaxial fan motors originally furnished with Type 120 bearings.

3.42.1.3 Install new label plates with the inscription "DO NOT LUBRICATE" on equipment using double seal bearings (Type 111, Class 8, or Type 120).

3.42.1.4 For equipment converted from re-lubricable bearings

to double seal bearings, install pipe plugs on all grease fills and drains.

3.42.1.5 For equipment converted from lubricated bearings to

double seal bearings, submit one legible copy, in approved transferrable media, of a report that reflects the change in the maintenance requirements for the converted motor.

3.42.2 For equipment not using double seal bearings, lubricate bearings with grease conforming to DOD-G-24508 as required in Paragraphs 244-1.7.7.1 and 244-1.7.7.3 of 2.6.

3.43 Assemble the equipment disassembled in 3.5, using 2.2 through 2.7 for guidance.

3.43.1 Do not use materials containing silicone in the repair and assembly of equipment with commutator or collector rings.

3.43.2 Install new fasteners conforming to MIL-DTL-1222, Type I or II, Grade 5, zinc coated.

3.43.3 Fasteners requiring a permeability factor of 2.0 or less shall conform to Grade 304 CRES.

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3.43.4 Install new gaskets on covers, inspection plates, and between the external connection box and the frame. Gaskets shall conform to MIL-PRF-1149 unless otherwise specified in 2.2.

3.43.5 Set brush holders not less than 1/16-inch or more than 1/8-inch from commutator or collector rings unless otherwise specified in 2.2.

3.43.6 Set brush holders in electrical neutral plane and stagger brushes for maximum coverage of the commutator, in accordance with Paragraph 300-4.7.7.1.10 of 2.3.

3.43.7 Center the brush holder over the collector rings.

3.43.7.1 Ensure the brushes do not extend beyond the edge of

the collector rings.

3.43.8 Install new brushes in accordance with 2.2. Sand new brushes to fit curvature of the commutator or collector rings, in accordance with Paragraph 6-3.5 through 6-3.5.4 of 2.8.

3.43.8.1 Brushes shall have a surface contact of 100 percent

and shall not be chipped, cracked, or broken.

3.43.8.2 Remove sand, carbon, and other foreign matter

resulting from fitting new brushes.

3.43.9 Adjust spring tension of brushes in accordance with 2.2.

3.43.10 Adjust air gap as specified in 2.2, plus or minus 10 percent.

3.43.11 Rotate shaft by hand a minimum of 3 revolutions. Rubbing or binding of the rotating assembly not allowed.

3.43.12 Install label plates conforming to MIL-DTL-15024 for those found to be missing or damaged.

(V) "NO-LOAD SHOP TEST"

3.44 Accomplish a no-load shop test of the motor for a minimum of one-half hour.

3.44.1 Verify proper direction of rotation.

3.44.2 After one-half hour, record current and voltage in each phase, speed and bearing temperature rise measured on the equipment's exterior near each bearing.

3.44.3 Submit one legible copy, in approved transferrable media, of the recorded data to the SUPERVISOR.

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(V) "OPERATIONAL SHOP TEST (FOR VANEAXIAL/TUBEAXIAL FANS - ASSEMBLY

COMPLETELY REASSEMBLED)"

3.45 With the vaneaxial/tubeaxial fan reassembled, accomplish an operational test for one hour after bearing and stator temperatures stabilize within one degree Celsius for 3 consecutive 15-minute intervals.

3.45.1 Verify proper direction of rotation.

3.45.2 Record current, voltage, frame and bearing temperature rise and speed at 15-minute intervals.

3.45.2.1 Bearing temperatures shall not exceed 180 degrees

Fahrenheit, unless otherwise specified in the invoking Work Item or equipment technical manual.

3.45.3 Measure and record hot insulation resistances of winding to ground immediately upon completion of the operational shop test, using a 500-volt megger.

3.46 Install equipment removed in 3.2.

3.46.1 Remove existing and install new foundation fasteners

conforming to MIL-DTL-1222, Type I or II, Grade 5, zinc coated, and self-locking hexagon nuts conforming to NASM-25027, excluding body-fitted bolts and studs.

3.46.2 Remove existing galled or distorted body-fitted bolts and studs and install new fitted bolts and studs conforming to MIL-DTL-1222, Type I, Grade 5.

3.46.3 Fasteners, body-fitted bolts, and studs requiring a

permeability factor of 2.0 or less shall conform to Grade 304 CRES.

3.46.4 Align equipment in accordance with 2.2. Measure and record facial and peripheral coupling data.

3.46.4.1 Install chocks, shims, shock mounts, and sound

damping pads.

3.46.4.2 Accomplish the requirements of 009-58 of 2.1 for

driver and pump shafts.

3.46.5 Connect electrical cables to equipment, using data retained in 3.1.1.1.

3.46.6 Bond and ground equipment in accordance with 2.9, using new ground straps.

3.46.7 Rotate shaft by hand a minimum of 3 revolutions. Rubbing or binding of rotating assembly not allowed.

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3.46.8 Measure and record the air gap and bearing clearance (sleeve bearing equipment only), insulation resistance (at 500 volts DC), and thrust.

(V)(G) "OPERATIONAL TEST"

3.47 Accomplish an operational test of the assembled equipment at full system capacity for one hour after bearing and stator temperatures stabilize within one degree Celsius for 3 consecutive 15-minute intervals, unless otherwise specified in the invoking Work Item.

3.47.1 Verify proper direction of rotation.

3.47.2 Verify/establish oxide film coating of the commutator/ collector rings, using 2.8 for guidance

3.47.3 Record current, voltage, frame and bearing temperature rise, and speed at 15-minute intervals. Frame and bearing temperature rise and speed is not required for vaneaxial and tubeaxial fan assemblies.

3.47.3.1 Bearing temperatures shall not exceed 180 degrees

Fahrenheit, unless otherwise specified in the invoking Work Item or equipment technical manual.

3.47.4 Measure and record hot insulation resistances of windings to ground immediately upon completion of test, using a 500-volt megger.

3.48 Submit one legible copy, in hard copy or approved transferrable media, of a report listing data recorded in 3.45.2, 3.45.3, 3.46.4, 3.46.8, 3.47.3, and 3.47.4 to the SUPERVISOR.

4. NOTES:

4.1 Equipment technical manual, Allowance Parts List (APL) (if applicable) and drawings will be listed in the invoking Work Item.

4.2 Shop test of generator will be addressed in the invoking Work Item.

4.3 The use of silicone is not allowed on any rotating electrical machinery containing brushes.

4.4 The purpose of 3.13.2, 3.16, 3.28.1.4, 3.29.3, 3.30.1, 3.31.1, 3.32.1, and 3.33.1 is to ensure the integrity of motors with a VPI Sealed Insulation System.

4.5 Utilize Attachment A for determination if the Navy’s motor bearing conversion program for Extended-Life Double Seal (ELDS) ball bearings is permissible).

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4.6 MIL-B-17931 (Bearings, Ball, Annular, for Quiet Operation) bearings are considered to be Long Lead Time (LLT) material. It is recommended these bearings be provided as Government Furnished Material (GFM).

4.7 Data received in 3.42.1.5 shall be forwarded to the local NSA logistics representative for the purpose of initiating action ensuring shipboard databases such as the Equipment Guidance List (EGL) are updated to reflect the change in maintenance requirements for converted motors.

Additinally, where APL changes are initiated to convert to ELDS bearings, a COSAL feedback report shall be submitted, providing the NSN and part number for the ELDS bearing by the NSA logistics representative. Utilize the following website to initiate changes to Technical Manuals, APLs, etc.:

http://www.anchordesk.navy.mil/htm/Select-a-Request.htm.

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ATTACHMENT A

1. To reduce motor maintenance and repair costs, the NAVY has implemented a program that allows for the use of Extended Life Double Seal (ELDS) bearings.

2. LIMITATIONS: The ELDS program does NOT apply to motors that are under the cognizance of NAVSEA 08.

3. APLs for motors meeting the conversion criteria requirements have been modified to identify ELDS bearings. In these cases, the APL bearing criteria will override any specifications delineated in the equipment technical manual or the motor "Original Equipment Manufacturer (OEM)" drawings. If ELDS bearings are not indicated in an APL, the following motor criteria must meet the applicability specifications for motors to undergo conversion to ELDS bearings:

3.a Motor must be installed on a surface ship and must NOT be under the cognizance of NAVSEA 08.

3.b Commercial motors are not eligible. Motors must have been furnished to the NAVY in accordance with MIL-DTL-17060 (Motors, Alternating Current, Integral Horsepower, Shipboard use), MIL-M-17413 (Motors, Direct Current, Integral H.P., Naval Shipboard [NAVY]) or MIL-M-17059 (Motors, 60 Cycle, Alternating Current Fractional H.P. [Shipboard Use]).

3.c Motors using one or more noise-quiet bearings per MIL-B-17931 (Bearings, Ball, Annular, For Quiet Operation) are NOT eligible for ELDS conversion.

3.d Bearings originally furnished with the motor must be Type 111 bearings per FF-B-171. Motors are NOT to be considered as candidates for ELDS conversion in situations where the equipment technical manual and/or the OEM motor drawings originally specified FF-B-171 bearings but have notes indicating that replacement bearings are to be in accordance with MIL-B-17931 (Bearings, Ball, Annular, For Quiet Operation).

3.e The use of ELDS bearings is limited to motors where the full load speed and the size of both bearings are as follows:

1. Maximum bearing size 306 or 206 and full load rpm between 1,801 and 3,600 rpm.

2. Maximum bearing size 313 or 213 and full load rpm between 1,201 and 1,800 rpm.

3. Maximum bearing size 318 or 218 and full load rpm less than 1200 rpm.

4. The repair process using ELDS bearings includes the following requirements:

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4.a Only ELDS bearings, in accordance with the following table (Attachment A / Table 1), can be used. Other double seal bearings will not provide an acceptable bearing life.

Attachment A / Table 1

ELDS Bearings NSNs and Part Numbers

SIZE P/N NSN

201 6201-2RS1C3/GHY 3110-01-492-0221

202 6202-2RS1C3/GHY 3110-01-491-0233

203 6203-2RS1C3/GHY 3110-01-491-0234

204 6204-2RS1C3/GHY 3110-01-491-6636

205 6205-2RS1C3/GHY 3110-01-451-9166

206 6206-2RS1C3/GHY 3110-01-451-9165

207 6207-2RS1C3/GHY 3110-01-451-9164

208 6208-2RS1C3/GHY 3110-01-451-9170

209 6209-2RS1C3/GHY 3110-01-451-9252

210 6210-2RS1C3/GHY 3110-01-492-1831

211 6211-2RS1C3/GHY 3110-01-518-0937

303 6303-2RS1C3/GHY 3110-01-493-3750

304 6304-2RS1C3/GHY 3110-01-451-9153

305 6305-2RS1C3/GHY 3110-01-451-9158

306 6306-2RS1C3/GHY 3110-01-451-9159

607 6307-2RS1C3/GHY 3110-01-451-9161

308 6308-2RS1C3/GHY 3110-01-451-9167

309 6309-2RS1C3/GHY 3110-01-451-9168

310 6310-2RS1C3/GHY 3110-01-490-6683

311 6311-2RS1C3/GHY 3110-01-492-0223

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312 6312-2RS1C3/GHY 3110-01-490-6848

313 6313-2RS1C3/GHY 3110-01-492-0191

314 6314-2RS1C3GHY 3110-01-492-0226

315 6315-2RS1C3/GHY 3110-01-494-0993

316 6316-2RS1C3/GHY 3110-01-492-0188

317 6317-2RS1C3/GHY 3110-01-492-0219

318 6318-2RS1C3/GHY 3110-01-493-3749

4.b Both bearings of each converted motor must be ELDS bearings.

4.c A label plate must be permanently attached to the motor indicating "Do Not Lubricate".

4.d Grease fills and drains, if present, must be fitted with a pipe plug, securely fastened. Fittings to accommodate grease guns must be replaced with pipe plugs."