Bolt Heaters Turbine Generator | Elmatic

(029) 2077 8727    

Wentloog Rd, Rumney, Cardiff, CF3 1XH

Bolt Heaters

Bolt Heater | Elmatic

We supply a fantastic selection of bolt heaters which perform an essential function in the maintenance of turbine generators. The latest designs were developed in conjunction with the CEGB and turbine manufacturers to meet industry’s requirements. They are approved to CEGB standard 12/64.

The length of our bolt heaters, loading and diameter are to CEGB specification. Other diameters, lengths & loadings are available to our customer’s specification.

*Connection to the supply via a Harvey Hubbell plug and socket, BS4343 or a cable connection.

*The fabricated stainless steel terminal box is robust, fitted with a substantial handle and has provision for identification bolt numbers.

*The range of heaters is based on two sizes of terminal box.

*The elements are offset in the low profile terminal box for maximum clearance.Top of Bolt Heater | Elmatic

*Element bundle replacement can be carried out on site, if required – no need to return the bolt heaters for maintenance.

*Supply volts = 110V

*All bolt heaters are fully interchangeable with the formerly which is manufactured by Redring Electric.

Types Of Terminal Box Arrangement

Arrangements
(see below)
Harvey Hubbell
Rating
Connector
Type of Harvey Hubbell
Plug required*
Redring ref.
I 30A 77-666801
II 30A 77-666801
III 60A 77-666802
IV 100A 77-666803

* The male plug is not supplied as part of the bolt heater. But can be obtained direct from Elmatic Ltd. Order under the above numbers separately

Arrgt. A B C D E F G H
I 3½” 4” 1¼” 4½” 3 5/16” 5⅝” 1⅝” 2¾”
II 3½” 5” 1⅝” 6⅜” 4” 5⅝” 1⅝” 2¾”
III 3½” 5” 1⅝” 6⅜” 4” 5⅝” 1½” 2¾”
IV 3½” 5” 1⅝” 6⅜” 4” 5⅝” 1½” 2¾”

 

BOLT DIA
INCHES
KW RATING/1” RUN/¼HR/STRAIN
0.15% 0.22% 0.30%
0.0237 0.0337 0.045
2 0.0325 0.046 0.062
0.0437 0.061 0.081
0.0543 0.0767 0.101
0.0675 0.095 0.126
3 0.0806 0.113 0.151
0.0912 0.127 0.172
0.106 0.148 0.200
0.123 0.173 0.232
4 0.140 0.197 0.262
0.160 0.225 0.300
0.181 0.255 0.340
0.202 0.287 0.383
5 0.220 0.310 0.413
0.246 0.347 0.473
0.273 0.386 0.515
0.305 0.430 0.575
6 0.333 0.470 0.627

Method Of Selecting Correct Size Of Heater

 

The Shank length, diameter and hole size of the stud or stud bolt will be known.
The correct % of strain will be as recommended by the Turbine Manufacturer.

  • From the table above select the index figure under the appropriate strain for the diameter or bolt to be heated.
  • Multiply this index figure by the shank length (portion to be heated) of the bolt. This will give the kW loading of the heater required.
  • Using schedule of standard sizes on page 3, find group with the correct heater diameter for the hole diameter in question. Typical radial clearance is 1/32”
  • Out of this group, select a heater of the kW loading as calculated in 2 above and with a heated length equal to the shank length of the bolt and a cold length at least equal to the length of cap nut.
  • It is possible that a heater with a longer cold length than actually required will have to be used. In this case an adjusting collar of correct size must be ordered to effectively reduce the cold length.

Example:
Data: 4” dia. Stud bolt
1¼ dia. Hole
20” length of Shank
0.22% of Strain
10” long Cap Nut From chart index figure = 0.197.
Loading = 0.197 x 20 = 3.94, say 4kw
From page 3, 1.1875” is best dia. of bolt heater, i.e. 1/32” radial clearance.
Redring ref. 77-663305 is obvious choice – 4kw x 20” long Heated Length x 15” long Cold Length
Because the Cap Nut is 10” long, Adjusting Collar Size 2 will have to be used set 5” from shoulder of terminal box.

Note:

If a heater of the required kW and heated length cannot be found, use a heater of a lower loading but correct heated length. If this has to be done then the design heating time of 15 minutes will have to be increased to compensate as follows:

  • Preferred loading = 4kW
  • Nearest loading available = 3kW
  • Heating time will be 15 x 4/3 = 20 minutes.

For more detailed information on our bolt heaters – see CEGB Standard 12/64. Needless to say, that Elmatic is the best manufacturers for outstanding heating elements.

Complete Bolt Heater Reference Heater dia Inches Watts Blade length Inches Cold length Inches Heated length
Inches
Termlbox arrgt.. Complete Spare Elt. Bundle reference
REDRING CEGB REDRING CEBG
77-662401 12/64/003 0.625 500 12 8.5 3.5 I 77-662301 12/64/153
77-662402 12/64/004 0.625 500 15 10 5 I 77-662302 12/64/154
77-662403 12/64/018 0.625 1000 15 9 6 I 77-662303 12/64/168
77-662404 12/64/019 0.625 1000 18 10 8 I 77-662304 12/64/169
77-662405 12/64/020 0.625 1000 24 13 11 I 77-662305 12/64/170
77-662406 12/64/036 0.265 2000 24 13 11 I 77-662306 12/64/186
77-662407 12/64/082 0.625 5000 54 9 45 III 77-662307 12/64/235
77-662408 12/64/051 0.625 3000 30 6 24 I 77-668301 12/64/203
77-662409 12/64/034 0.625 2000 25 5 20 I 77-662309 12/64/184
77-662410 12/64/035 0.625 2000 37 7 30 I 77-662310 12/64/185
77-662411 12/64/007 0.625 500 26 21 5 I 77-662311 12/64/152
77-662412 12/64/033 0.625 2000 15 4 11 I 77-668302 12/64/183
77-662413 12/64/017 0.625 1100 14 6 8 I 77-668303 12/64/167
77-662414 12/61/843 0.625 500 13 8 5 I 77-668304 12/61/844
77-662701 12/64/005 0.734 500 15 10 5 I 77-662601 12/64/155
77-662702 12/64/006 0.734 500 18 9 9 I 77-662602 12/64/156
77-662703 12/64/021 0.734 1000 15 9 6 I 77-662603 12.64/171
77-662704 12/64/022 0.734 1000 18 10 8 I 77-662604 12/64/172
77-662705 12/64/023 0.734 1000 24 13 11 I 77-662605 12/64/173
77-662706 12/64/024 0.734 1000 34 8 26 I 77-662606 12/64/174
77-662707 12/64/037 0.734 2000 21 11 10 I 77-662607 12/64/187
77-662708 12/64/038 0.734 2000 24 11 13 I 77-662608 12/64/188
77-662709 12/64/039 0.734 2000 33 17.5 15.5 I 77-662609 12/64/189
77-662710 12/64/040 0.734 2000 42 7 35 I 77-662610 12/64/190
77-662711 12/64/053 0.734 3000 35 15 20 I 77-662611 12/64/204
77-662712 12/64/068 0.734 4000 53 12 41 III 77-662612 12/64/218
77-663001 12/64/099 0.875 6000 48 10 38 III 77-662901 12/64/249
77-663002 12/64/046 0.875 2000 30 9 21 I 77-662902 12/64/196
77-663003 12/64/047 0.875 2000 27 12 15 I 77-662903 12/64/197
77-663004 12/64/060 0.875 3000 20 9 11 I 77-662904 12/64/208
77-663005 12/64/061 0.875 3000 23 9 14 I 77-662905 12/64/209
77-663006 12/64/062 0.875 3000 25 6 19 I 77-662906 12/64/210
77-663007 12/64/076 0.875 4000 30 4 26 III 77-669001 12/64/224
77-663008 12/64/065 0.875 3000 19 6 15 I 77-669002 12/64/211
77-663009 12/64/054 0.875 3000 36 8 28 I 77-662907 12/64/213
77-663010 12/64/044 0.875 2000 18 8 10 I 77-662908 12/64/194
77-663011 12/64/063 0.875 3000 31 7 24 I 77-662909 12/64/216
77-663012 12/64/064 0.875 3000 42 14 28 I 77-662910 12/64/217
77-663013 12/64/059 0.875 3000 34 13 21 I 77-662911 12/64/215
77-663014 12/64/058 0.875 3000 30 15 15 I 77-662912 12/64/214
77-569201 12/64/066 1.000 3000 19 6 14 I 77-664203 12/64/212
77-669202 12/64/041 1.000 2000 13 4 9 I 77-664202 12/64/193


Heaters Sizes And Reference Numbers Continued

Complete Bolt
Heater reference
Heater Ø
Inches
Watts Blade Length Inches Cold Length Inches Heated Length Inches Term Box
Style.
Complete Spare Element Bundle references
REDRING CEGB REDRING CEGB
77-663301 12/64/042 1.1875 2000 24 14 10 II 77-663201 12/64/191
77-663302 12/64/055 1.1875 3000 24 11 13 II 77-663202 12/64/205
77-663303 12/64/056 1.1875 3000 35 15 20 II 77-663203 12/64/206
77-663304 12/64/069 1.1875 4000 24 8.5 15.5 III 77-663204 12/64/219
77-663305 12/64/070 1.1875 4000 35 15 20 III 77-663205 12/64/220
77-663306 12/64/086 1.1875 5000 48 23 25 III 77-663206 12/64/236
77-663307 12/64/100 1.1875 6000 48 23 25 III 77-663207 12/64/250
77-663308 12/64/101 1.1875 6000 54 14 40 III 77-663208 12/64/251
77-663309 12/64/113 1.1875 8000 42 14 28 IV 77-663209 12/64/263
77-663310 12/64/114 1.1875 8000 54 19 35 IV 77-663210 12/64/264
77-663311 12/64/126 1.1875 10000 54 16 38 IV 77-663211 12/64/276
77-663312 12/64/127 1.1875 10000 60 15 45 IV 77-663212 12/64/277
77-663313 12/64/140 1.1875 11000 54 16 38 IV 77.663213 12/64/290
77-663314 12/64/141 1.1875 11000 60 15 45 IV 77-663214 12/64/291
77-663601 12/64/043 1.375 2000 18 9 9 II 77-663501 12/64/192
77-663602 12/64/057 1.375 3000 24 14 10 II 77-663502 12/64/207
77-663603 12/64/071 1.375 4000 24 11.5 12.5 III 77-663503 12/64/221
77-663604 12/64/072 1.375 4000 35 15 20 III 77-663504 12/64/222
77-663605 12/64/087 1.375 5000 28 12.5 15.5 III 77-663505 12/64/237
77-663606 12/64/128 1.375 10000 45 15 30 IV 77-663506 12/64/278
77-663901 12/64/073 1.438 4000 24 11.5 12.5 III 77-663801 12/64/223


Enquiries and Delivery

"When it comes to deliveries, most items are available in 15 working days. However, Elmatic do offer additional emergency services for customers who are in a breakdown situation. This includes a 48hr services on Mica products, Cartridge Heaters and Ceramic Knuckle Heaters and a 7 day service on our range of Sheath Wire Incoloy Heaters. For all enquires please contact a member of our sales team who will be happy to assist. +44 (0) 2920 778727"


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