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7950050/4
Direct Steam Injection (SI) Humidifiers
Installation and Maintenance Instructions
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IM-P795-04 CH Issue 4
Printed in the UK
Type 20 and Type 40
IM-P795-04
1. Safety information
2. General
product information
3. Installation
4. Commissioning
5. Maintenance and
spare parts
6. Trouble shooting
© Copyright 2005
CH Issue 4
1
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Summary of Contents for Spirax Sarco SI 20
- Page 1 IM-P795-04 7950050/4 CH Issue 4 Type 20 and Type 40 Direct Steam Injection (SI) Humidifiers Installation and Maintenance Instructions 1. Safety information 2. General product information ��� � � ��� 3. Installation 4. Commissioning 5. Maintenance and spare parts 6. Trouble shooting IM-P795-04 CH Issue 4 ©...
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Page 2: Safety Information
Group 2 of the above mentioned Pressure Equipment Directive. The products’ use on other fluids may be possible but, if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of the product for the application being considered. -
Page 3: Pressure Systems
Allow time for temperature to normalise after isolation to avoid danger of burns. 1.9 Tools and consumables Before starting work ensure that you have suitable tools and/or consumables available. Use only genuine Spirax Sarco replacement parts. 1.10 Protective clothing Consider whether you and/or others in the vicinity require any protective clothing to protect against the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and dangers to eyes and face. -
Page 4: Returning Products
1.16 Returning products Customers and stockists are reminded that under EC Health, Safety and Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk. -
Page 5: General Product Information
2. General product information 2.1 Description Spirax Sarco direct steam injection (SI) humidifiers are designed to inject dry steam into a ducted air system in such a manner as to ensure efficient mixing of the steam and air, and to raise the moisture content of the air stream with no condensate carryover. - Page 6 Associated equipment, such as steam traps, strainers, pressure reducing stations etc., which may be part of the order, will be packed separately. Where Spirax Sarco supply the valve (any make), it will be already connected to the separator outlet using the appropriate fittings.
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Page 7: Installation
3.1.5 The installer is responsible for the main lance steam supply / supporting pipework. 3.1.6 As the tracer heating circuit is parallel to, but independent from, the main lance steam supply, it can be run in any acceptable material. Spirax Sarco are able to supply 8 mm annealed copper for this purpose. - Page 8 2600 mm and over 3.3.5 Figures 7 to 10, page 12 give details of the piping components supplied as standard with Spirax Sarco humidifiers. 3.3.6 Table 1 indicates suitable pipe sizes to maintain the correct steam flow to the lance(s) without creating excessive pipework pressure loss between the control valve outlet and the lance inlet.
- Page 9 However, this does not infer that total absorption has taken place. To keep the absorption distance to a minimum, the Spirax Sarco SI direct injection humidifier has been designed to project the steam initially against the air flow. Since no two systems are identical, the characteristics of the particular installation will effect the design requirements referred to above.
- Page 10 Humidity and temperature sensors should be installed at a sufficient distance downstream to ensure full mixing of the air and steam to obtain true readings (see Figure 4). High limit humidistats, typical set at 90% Relative Humidity, would normally be installed 2 to 3 m (6.5 to 10 ft) downstream of the humidifier.
- Page 11 Insulation Duct wall Escutcheun plate ��� � � ��� Fig. 5 Alternative separate steam supply for pre-heater - maximum 4 bar g (58 psi g) Parts shown in dotted line - Customer to supply. 115 mm 2 holes 65 mm 5 mm 50 mm 100 mm...
- Page 12 DN20 DN20 DN25 DN25 DN15 DN15 Fig. 7 Type 20 screwed Fig. 8 Flanged PN16 EN 1092 The appropriate piping components will be supplied with each humidifier to match the valve supplied, or valve to be fitted. Where a valve is not supplied the pipe fittings used between the separator and the valve will be fitted to the separator outlet pipe.
- Page 13 Fig. 13 Vertical multi-lance system where separate steam supply and condensate headers, suitably trapped, are needed. For more detailed information or assistance with this type of installation, please contact your local Spirax Sarco engineer, or Spirax Sarco branch office. IM-P795-04 CH Issue 4...
- Page 14 ��� � � ��� Air flow Plan Fig. 14 Horizontal duct - Horizontal lance ��� � � ��� Air flow Plan Fig. 15 Horizontal duct - Vertical lance IM-P795-04 CH Issue 4...
- Page 15 ��� � � ��� Plan Air flow Fig. 16 Vertical duct - Horizontal lance 0.5 metre injection distance 'C' control humidity sensor Return air Exhaust Absorption High limit humidistat distance Outside Control humidity sensor 'C' Air handling unit Temperature sensor Fig.
- Page 16 3.9.6 It is recommended that all condensate be returned by gravity to a vented receiver, and then be returned by a Spirax Sarco automatic condensate pump to the boiler house. To humidifier Fig.
- Page 17 3.10 Control air for pneumatic actuators When valves and actuators are supplied, full manufacturer’s installation and commissioning instructions are included. Purchasers must ensure that these specialist products are fully compatible with any other control elements supplied by others. 3.10.1 The air supply must be dry, clean and free from oil contamination. This is particularly important where a pneumatic positioner is used.
- Page 18 3.11 Electrical supply for electric actuators When valves and actuators are supplied separately, full manufacturer’s installation and commissioning instructions are included. Purchasers must ensure that these specialist products are fully compatible with any other control elements supplied by others. 3.11.1 All electrical wiring and connections should be carried out in accordance with national or local regulations and standards.
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Page 19: Maintenance And Spares
4. Commissioning Ensure the humidifier has been correctly installed as recommended in Section 3, and all pipework is free of dirt. If an electric actuator is supplied then all electrical wiring and connections should be carried out in accordance with national or local regulations and standards. Note: In the event of a pneumatic actuator being supplied then the motive air supply must be dry, clean and free from all oil contamination. -
Page 20: Troubleshooting
Discharge trap to drain or collecting tank and pump condensate to overhead return main. Inoperative trap on tracer- Trap should be Spirax Sarco or insufficient lance heating. trap circuit. Type MST18 or MST21 with 'E' fill balanced pressure capsule. Main control valve activated...
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