CRG Boiler Systems is a manufacturer of industrial unit Hazloc SRH steam rig heater series for hazardous and severe-duty locations.

HAZLOC Heater Systems

Manufacturer of Industrial Unit Heaters for hazardous and severe-duty locations

CRG Boiler Systems also offers the HAZLOC heaters configurations for rugged conditions and inclement weather locations. The HAZLOC line of heating applications delivers climate control solutions through heating systems for asset protection solutions and improved work environment conditions. CRG regards the HAZLOC line of heating applications as a "Tier One" product selection for meeting industry demands in the most of uncompromising elements.

Steam Rig Heater Series

The SRH series of heat-exchanger unit heaters is designed for steam applications on drilling rigs where boiler neglect can lead to freeze-up conditions. During an accidental freeze-up the SafeDeform™ core headers are designed to accommodate ice expansion. The SRH Series is designed for pressures up to 100 psi in single-pass configurations only. SRH heaters meet ASME requirements with a CRN.

Literature

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Steam Rig Heater Series

Introduction

The Steam Rig Heater (SRH) series of heat-exchanger unit heaters is specifically designed to meet the demanding requirements of the oil & gas well drilling industry. The harsh operating conditions of this industry require heating equipment that is safe, reliable, dependable, and available when you need it. The SRH series of heaters are built with you in mind, because we know that boiler failure or crew neglect could result in an accidental freeze-up of the heating system.

Simple, yet effective... with you in mind!

All Hazloc Heaters™ SRH models are designed to ASME requirements for steam applications with maximum operating pressures up to 100 PSIG (689 kPa). The five sizes of SRH heaters include our SafeDeform™ top and bottom core headers which are designed to deform to the increased volume, due to ice expansion, during freeze-up conditions. This feature allows SRH heaters to be frozen several times without critical damage which keeps your safety in mind. With our SafeDeform™ feature, multi-pass core configurations are not available.

Interchangeable with other brands of heaters!

Hazloc Heaters™ SRH series are designed with cabinet dimensions and mounting holes equivalent to a major competitor’s heaters making them easily interchangeable. Furthermore, Hazloc Heaters’ rugged and superior SRH SafeDeform™replacement cores are also designed to slide into equivalent sizes of their heaters. An added benefit is our 18-month heater warranty!

Maximum durability… rugged fin tubes!

All SRH SafeDeform™ heat-exchanger cores are constructed using rugged 16-gauge (0.065 in.) carbon-steel tubes with tension-wound aluminum fins and 12-gauge (0.105 in.) carbon-steel headers for maximum durability, resistance to corrosion, and longer life in your demanding applications.

SRH Model Coding

• † Available in single-pass
configuration only due to SafeDeformTM design.
• * Other voltages and 3-phase motors available upon request.
• Longer lead times may apply. Contact factory.
• Motors are designed to be operated at rated voltage with tolerances of ± 15%.
• If ordering explosion-proof motor, ensure equipment meets the requirements of your hazardous area rating.

SRH Physical Dimensions

Heater
Size
 12 16 20 24 30
Dim.
 Inches
 Inches
 Inches
 Inches
 Inches
(mm) (mm) (mm) (mm) (mm)
A
 12.6
 15.51
 19.49
 23.46
 29.53
(320) (394) (495) (596) (750)
B
 4.02
 4.02
 4.02
 4.65
 5.71
(102) (102) (102) (118) (145)
C
 1.85
 2.38
 2.4
 2.4
 2.4
(47) (60.5) (61) (61) (61)
D
 16.3
 20.28
 24.29
 28.27
 34.33
(414) (515) (617) (718) (872)
E
 9.76
9.76
10.51
11.81
13.78
(248) (248) (267) (300) (350)
F
 6.77
 5.77
 5.75
 6.69
 7.48
(172) (146.5) (146) (170) (190)
G
 (2 holes)
 1.75
 2.5
 2.76
 3.15
(44.5) (63.5) (70) (80)
H
 2.64
 2.64
 3.62
 4.29
 4.37
(67) (67) (92) (109) (111)
J
 11.02
 15
 17
 19.69
 25.59
(280) (381) (432) (500) (650)
K
 1.38
 1.38
 1.38
 1.38
 1.38
(35) (35) (35) (35) (35)
L
 21.65
 21.65
 22.83
 24.21
 27.36
(550) (550) (580) (615) (695)
SRH Steam Tables

Steam Performance Tables

SRH1-12 @60 Hz Entering Air Temperature
PSIG
 °F
 Performance
 -10 0 10 20 30 40 50 60 70
10 239 Output (103 btu/hr)
 77 74 70 66 63 59 56 53 49
Cond. (lbs/hr)
 81 77 73 69 66 62 59 55 52
FAT (°F)
 45.6 54.2 62.6 71.0 79.3 87.5 95.7 103.9 111.9
20 259 Output (103 btu/hr)
 84 80 76 72 69 65 62 58 55
Cond. (lbs/hr)
 89 85 81 77 73 69 66 62 59
FAT (°F)
 50.2 58.8 67.3 75.8 84.1 92.2 100.4 108.6 116.8
40 287 Output (103 btu/hr)
 92 88 85 81 77 74 70 67 63
Cond. (lbs/hr)
 100 96 92 88 84 80 76 72 69
FAT (°F)
 56.3 65.0 73.6 82.1 90.6 99.0 107.3 115.5 123.7
60 307 Output (103 btu/hr)
 98 95 91 87 83 80 76 73 69
Cond. (lbs/hr)
 109 104 100 96 92 88 84 80 77
FAT (°F)
 61.0 69.7 78.4 87.0 95.5 103.9 112.3 120.6 128.9
80 324 Output (103 btu/hr)
 104 100 96 92 89 85 82 78 75
Cond. (lbs/hr)
 116 112 108 103 99 95 91 87 83
FAT (°F)
 64.9 73.7 82.5 91.1 99.7 108.2 116.6 125.0 133.2
100 338 Output (103 btu/hr)
 108 105 101 97 93 89 86 82 79
Cond. (lbs/hr)
 123 118 114 110 105 101 97 93 89
FAT (°F)
 68.1 76.9 85.7 94.4 103.0 111.6 120.0 128.4 136.7
SRH1-16 @60 Hz Entering Air Temperature
PSIG
 °F
 Performance
 -10 0 10 20 30 40 50 60 70
10 239 Output (103 btu/hr)
 123 117 111 105 100 94 89 84 78
Cond. (lbs/hr)
 129 122 116 110 104 99 93 88 82
FAT (°F)
 48.5 56.9 65.3 73.5 81.7 89.8 98.0 106.0 113.9
20 259 Output (103 btu/hr)
 132 126 121 115 109 104 98 93 87
Cond. (lbs/hr)
 141 134 128 122 116 110 104 99 93
FAT (°F)
 53.1 61.6 70.0 78.3 86.6 94.8 103.0 111.0 119.0
40 287 Output (103 btu/hr)
 146 140 134 128 123 117 111 106 101
Cond. (lbs/hr)
 159 152 146 139 133 127 121 115 109
FAT (°F)
 59.8 68.3 76.9 85.3 93.6 101.9 110.1 118.3 126.4
60 307 Output (103 btu/hr)
 157 151 144 138 133 127 121 116 110
Cond. (lbs/hr)
 173 166 159 153 146 140 134 128 121
FAT (°F)
 64.6 73.3 81.9 90.4 98.8 107.1 115.4 123.6 131.7
80 324 Output (103 btu/hr)
 166 159 153 147 141 135 130 124 118
Cond. (lbs/hr)
 185 178 171 165 158 151 145 139 132
FAT (°F)
 68.9 77.6 86.2 94.8 103.2 111.6 119.9 128.2 136.3
100 338 Output (103btu/hr)
 173 166 160 154 148 142 136 130 125
Cond. (lbs/hr)
 195 188 181 174 168 161 154 148 141
FAT (°F)
 72.2 81.0 89.6 98.2 106.7 115.1 123.5 131.8 140.0
SRH Steam Tables (Continued)

Steam Performance Tables

SRH1-20 @60 Hz Entering Air Temperature
PSIG
 °F
 Performance
 -10 0 10 20 30 40 50 60 70
10 239 Output (103 btu/hr)
 207 197 187 178 168 159 150 141 132
Cond. (lbs/hr)
 217 207 196 186 177 167 157 148 139
FAT (°F)
 44.3 52.9 61.2 69.7 78.1 86.4 94.6 102.8 110.9
20 259 Output (103 btu/hr)
 227 217 207 197 187 178 168 159 150
Cond. (lbs/hr)
 241 230 220 209 199 189 179 169 159
FAT (°F)
 49.4 58.0 66.5 75.0 83.4 91.7 100 108.1 116.2
40 287 Output (103 btu/hr)
 251 240 230 220 210 201 191 182 172
Cond. (lbs/hr)
 272 261 250 239 228 218 207 197 187
FAT (°F)
 55.7 64.4 73.0 81.5 90.0 98.4 106.7 115.0 123.2
60 307 Output (103 btu/hr)
 269 258 248 237 227 218 208 198 189
Cond. (lbs/hr)
 296 285 273 262 251 240 229 219 208
FAT (°F)
 60.3 69.1 77.7 86.4 94.9 103.3 111.7 120.0 128.3
80 324 Output (103 btu/hr)
 284 273 262 252 242 232 222 212 203
Cond. (lbs/hr)
 317 305 294 282 271 260 249 238 227
FAT (°F)
 64.3 73.1 81.8 90.4 99.0 107.5 115.9 124.3 132.6
100 338 Output (103 btu/hr)
 296 285 274 264 254 243 234 224 214
Cond. (lbs/hr)
 335 323 311 299 287 276 265 254 243
FAT (°F)
 67.4 76.3 85.0 93.7 102.3 110.8 119.3 127.7 136.0
SRH1-24 @60 Hz Entering Air Temperature
PSIG
 °F
 Performance
 -10 0 10 20 30 40 50 60 70
10 239 Output (103 btu/hr)
 426 403 383 362 342 323 304 286 267
Cond. (lbs/hr)
 446 422 401 379 359 338 319 299 280
FAT (°F)
 77.9 85.1 92.5 99.8 107.0 114.2 121.2 128.1 135.0
20 259 Output (103 btu/hr)
 471 448 427 406 385 364 344 325 305
Cond. (lbs/hr)
 500 476 453 431 409 387 366 345 325
FAT (°F)
 87.2 94.7 102.1 109.4 116.6 123.7 130.6 137.5 144.3
40 287 Output (103 btu/hr)
 521 498 476 454 433 412 392 372 352
Cond. (lbs/hr)
 565 540 516 493 470 447 425 403 382
FAT (°F)
 97.6 105.2 112.7 120.1 127.4 134.7 141.7 148.7 155.6
60 307 Output (103 btu/hr)
 557 535 512 490 469 448 427 407 387
Cond. (lbs/hr)
 615 590 565 541 517 494 471 448 426
FAT (°F)
 105.3 113.0 120.6 128.1 135.5 142.8 149.9 157.0 163.9
80 324 Output (103 btu/hr)
 589 566 543 521 499 477 456 436 415
Cond. (lbs/hr)
 659 633 608 583 558 534 510 487 465
FAT (°F)
 111.9 119.7 127.3 134.9 142.3 149.6 156.9 164.0 171.0
100 338 Output (103 btu/hr)
 614 591 568 545 523 501 480 459 439
Cond. (lbs/hr)
 696 669 643 618 593 568 544 520 497
FAT (°F)
 117.1 124.9 132.7 140.3 147.8 155.1 162.4 169.6 176.7
SRH Steam Tables (Continued)
SRH1-30 @60 Hz Entering Air Temperature
PSIG
 °F
 Performance
 -10 0 10 20 30 40 50 60 70
10 239 Output (103 btu/hr)
 658 625 593 561 530 499 470 441 412
Cond. (lbs/hr)
 690 655 621 588 555 523 492 462 432
FAT (°F)
 84.0 91.2 98.4 105.4 112.4 119.2 126.1 132.7 139.3
20 259 Output (103 btu/hr)
 711 678 644 612 580 549 520 490 461
Cond. (lbs/hr)
 755 719 684 650 617 584 552 520 490
FAT (°F)
 91.6 98.9 106.1 113.2 120.3 127.1 134.1 140.8 147.5
40 287 Output (103 btu/hr)
 788 753 720 686 654 622 591 561 531
Cond. (lbs/hr)
 854 817 780 744 709 675 641 608 576
FAT (°F)
 102.4 109.9 117.2 124.5 131.7 138.7 145.6 152.5 159.3
60 307 Output (103 btu/hr)
 844 809 775 741 708 676 644 613 583
Cond. (lbs/hr)
 931 892 854 817 781 745 710 676 643
FAT (°F)
 110.5 118.0 125.5 132.8 140.1 147.1 154.2 161.1 168.0
80 324 Output (103 btu/hr)
 892 857 821 787 754 721 688 657 627
Cond. (lbs/hr)
 998 958 919 880 843 806 770 735 701
FAT (°F)
 117.4 125.0 132.5 139.9 147.1 154.3 161.4 168.4 175.3
100 338 Output (103 btu/hr)
 930 894 859 824 790 757 725 693 661
Cond. (lbs/hr)
 1,054 1,013 973 933 895 857 821 785 749
FAT (°F)
 122.9 130.6 138.1 145.5 152.9 160.1 167.2 174.2 181.2

How to Order

When ordering please follow the “Model Code Sequence Required for Ordering” in SRH Model Coding to specify base model, motor voltage, phase, frequency and motor enclosure type. If ordering explosion-proof motors also specify motor hazardous location area rating required.


Example Model Code: SRH1-16-C-1-230160-E (suitable for Class I, Div.1, Group D, T3B)

Nomenclature

• 103 – 1000
• BTU – British Thermal Unit
• Cond. – Condensate Flow Rate
• FPM – Feet Per Minute

• FAT – Final Air Temperature
• PSIG – Pounds Per Square Inch Gauge Pressure
• CFM – Cubic Feet Per Minute

SRH Specifications by Model Size
Model
SRH1-12
 SRH1-16
 SRH1-20
 SRH1-24
 SRH1-30
Fan diameter in. (mm)
 12 (304.8)
 16 (406.4)
 20 (508.0)
 24 (609.6)
 30 (762.0)
Air delivery* cfm (m3/hr)
 1090 (1852)
 1650 (2803)
 3000 (5097)
 3800 (6456)
 5500 (9344)
Approx. air velocity* fpm (m/s)
 1305 (6.6)
 1111 (5.6)
 1309 (6.6)
 1138 (5.8)
 1066 (5.4)
Air throw* @ 15 psi steam ft (m)
 45 (13.7)
 65 (19.8)
 70 (21.3)
 80 (24.4)
 85 (25.9)
Motor power      hp (watts)
 ¼ (186)
 ¼ (186)
 ½ (373)
 ½ (373)
 1 (746)
Rec. min. mounting height  ft (m)
 7.5 (2.3)
 7.5 (2.3)
 7.5 (2.3)
 7.5 (2.3)
 7.5 (2.3)
Net weight lbs (kg)
 78 (35.4)
 98 (44.4)
 132 (59.9)
 200 (90.7)
 257 (116.6)
Approx. shipping weight  lbs (kg)
 138 (62.6)
 158 (71.7)
 207 (93.9)
 275 (124.7)
 347 (157.4)
SRH General Specifications
Approval
 CRN: 0H6664.2 - steam or fluids (not for use with lethal fluids as defined by ASME, Section VIII, Div. 1, A03, UW-2).
Maximum pressure rating
 100 psig (689 kPa).
Maximum design temperature
 550 °F (288°C).
Cabinet material
 14-gauge (0.075 in.) (1.9 mm) steel. Yellow epoxy/polyester powder coated with five-stage pretreatment, including iron phosphate.
Louver blades
 Anodized extruded aluminum.
Fan
 Spark-proof three-blade aluminum (except SRH1-30 which is two blade).
Fan guard
 Split design with close wire spacing. A 3/8 in. (9.5 mm) diameter probe will not enter.
Motor type
 Thermally protected CSA or UL Listed 1725 RPM permanently lubricated ball bearing type with 56 frame. See page 3 for ordering requirements.
Mounting holes
 5/8 in. - 11 UNC – 4 holes at top of heater (2 holes, SRH1-12).
Fluid connections
 2 in. NPT female inlet and outlet.
Header material
 Minimum 12 gauge (0.105 in.) (2.7 mm) carbon steel conforming to
ASME requirements.
Finned tubes
 5/8 in. (15.9 mm) outside diameter [16-gauge, 0.065 in. (1.6 mm) wall thickness] carbon steel tubes with 1-1/2 in. (38.1 mm) outside diameter copper-free, L-foot, tension-wound aluminum fins @ 10 fins per in.
Accessories – Mounting Brackets

WMB*
Wall Mounting Bracket For use in buildings that have substantial walls. The Z sections provide additional support where necessary.

BMB*
Basic Mounting Bracket For applications where the support arm can be bolted or welded directly to structural steel or concrete.

PMB*
Pipe Mounting Bracket
For buildings with insufficient strength to use other types of mounting brackets. Requires 3 in. pipe (3.5 in. O.D., min. Sch. 40, not supplied).

HMB
Hanging Mounting Bracket
Ideal and economical if adequate overhead structure exists. Requires 1/2 in. pipe, cut and threaded (min. Sch. 40 not supplied).

Note:
When ordering mounting brackets, please specify the type of bracket preferred and the basic model code of the heater to be mounted. Example, PMB-SRH1-16. Mounting kits are made of steel with a black enamel paint finish. Structural support of heater and bracket during transit is required.


Thermostats

ET5STS (SPST)
Line-Voltage Thermostat 22 Amps Resistive Load, 277 VAC Max 3/4 HP@125 VAC; 1-1/2 HP@ 250/277 VAC Ship wt - 0.6 lbs (0.28 kg)

TBX1 (SPDT)
Explosion-proof Thermostat -
Class I, Groups C&D, Class II, Groups E, F & G
Temperature range: 40°F to 80°F (5°C to 27°C),
3/4” - NPT conduit opening on top and bottom.
22 Amps Resistive Load, 277 VAC Max; 3/4 HP@125 VAC;
1-1/2 HP@ 250/277 VAC
Overall dimensions - 6.4 in (16.2 cm) W x 5.6 in (14.3 cm) H x 4.4 in (11.1 cm) D
Ship wt - 5.3 lbs (2.4 kg)
* Not suitable for model SRH1-30

Additional Products & Warranty
Additional Products Available

HUH
The HUH series of heat-exchanger unit heaters is designed for steam, hot water, glycol or other fl uid circulating heating systems. Suitable for pressures and temperatures up to 400 psi and 550 °F respectively. Meets ASME requirements with a CRN.

HHP
The high performance series of heat-exchanger unit heaters is designed for steam, hot water, glycol or other fluid circulating heating systems. Suitable for pressures and temperatures up to 450 psi and 550 °F respectively. Meets ASME requirements with a CRN.

XEU1
The XEU1 series of explosion-proof electric air heaters are designed to meet U.S. and Canadian certification standards. The three sizes of XEU1 heaters are available in 27 model choices of voltage and heat output combinations to meet your specific requirements.

Limited 18-Month Warranty

Hazloc Heaters™ warrants all SRH series of explosion-proof electric heaters against defects in materials and workmanship under normal conditions of use for a period of eighteen (18) months from date of purchase based on the following terms:
• 1. The heater must not be modified ed in any way.
• 2. The heater must be stored, installed and used only in accordance with the owner’s manual and attached data plate information.
• 3. Replacement parts will be provided free of charge as necessary to restore any unit to normal operating condition, provided that the defective parts be returned to us freight prepaid and that the replacement parts be accepted freight collect.
• 4. The complete heater may be returned to our manufacturing plant for repair or replacement (at our discretion), freight charges prepaid.
• 5. Contamination by dirt, dust, etc. or corrosion will not be considered as defects.
• 6. This warranty shall be limited to the actual equipment involved and, under no circumstances, shall include or extend to installation or removal costs, or to consequential damages or losses.