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3160050/14
IM-P316-03
CTLS Issue 14
SV615
Safety Valve
Installation and Maintenance Instructions
1. Safety information
2. General product information
3. Supply
4. Handling
5. Before fitting the valve
6. Installation
7. Damage prevention
8. Commissioning
9. Testing during use
10. Guidelines for setting
11. Maintenance
© Copyright 2019
IM-P316-03 CTLS Issue 14
1
Printed in GB
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Summary of Contents for Spirax Sarco SV615
- Page 1 3160050/14 IM-P316-03 CTLS Issue 14 SV615 Safety Valve Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Supply 4. Handling 5. Before fitting the valve 6. Installation 7. Damage prevention 8. Commissioning 9. Testing during use 10. Guidelines for setting 11.
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Page 2: Safety Information
Information Sheets. (These fluids are in Group 2 of the above mentioned Pressure Equipment Directive). The product’s 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: Protective Clothing
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 any protective clothing is required by yourself and/or others in the vicinity to protect against the hazards of, for example, chemicals, high/low temperature, noise, falling objects, and dangers to eyes and face. -
Page 4: Returning Products
Customers and stockists are reminded that under UK and 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 The SV615 full lift, full nozzle safety valve is suitable for steam, air, inert industrial gas and non-hazardous liquid service. Available types Valves are available in sizes ranging from DN15 to DN50 and have a bronze body with female screwed connections and a stainless steel nozzle. -
Page 6: Pressure/Temperature Limits
2.3 Pressure/temperature limits Please contact Spirax Sarco, when so required, for relevant details regarding the maximum allowable limits that the shell can withstand. Steam saturation curve Pressure bar g Maximum set pressure Maximum set pressure The product must not be used in this region. - Page 7 2.4 Dimensions/weights (approximate) in mm and kg Connection Flow Size Inlet Outlet Lift D Ø E Ø Weight DN15 ½" ¾" DN20 ¾" 1¼" Screwed DN25 1" 1½" BSPF x BSPF DN32 1¼" 2" 7.25 NPTF x NPTF DN40 1½" 2½"...
- Page 8 2.5 Materials Part Material Body Bronze BS EN 1982 CC491KM DN15 Stainless steel BS 970 431 S29 DN20 DN25 Nozzle Stainless steel BS 3146 Pt2 Gr. ANC2 DN50 Sanitary Stainless steel ASTM A276 316L connection Disc Stainless steel ASTM A276 316L Lever housing Bronze BS EN 1982 CC491KM...
- Page 9 Sealed cap option Soft seal disc option 1" Sanitary clamp version Screwed version Fig. 3 IM-P316-03 CTLS Issue 14...
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Page 10: Selection Example
Please note if ELNP finish is required, add 'P'. SV615 DN15 BSPF x BSPF How to order example: 1 off Spirax Sarco SV615AN safety valve having DN15 screwed BSPF x BSPF connection, set at 6 bar g. IM-P316-03 CTLS Issue 14... - Page 11 Normally, the valve will be supplied set at the required pressure and sealed. Setting of Spirax Sarco safety valves must only be carried out by authorised, competent persons. Spirax Sarco accepts no responsibility for valves which have been reset by unauthorised persons.
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Page 12: Installation
Built up backpressure occurs as a result of a safety valve relieving into the discharge pipework. To ensure adequate system protection and correct safety valve performance, Spirax Sarco recommend that this built up backpressure does not exceed 10% of the gauge set pressure. This value may be exceeded even when using short runs of pipework of the same nominal bore as the safety valve outlet. - Page 13 Fig. 4 Not drawn to scale Discharge to safe area Fig. 5 To safe small bore drain area IM-P316-03 CTLS Issue 14...
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Page 14: Damage Prevention
7. Damage prevention Excessive pressure loss at the inlet of a safety valve when it operates will cause extremely rapid opening and closing of the valve, observed as chattering or hammering. This may result in reduced capacity as well as damage to seating faces and the other parts of the valve. - Page 15 8. Commissioning Once the valve has been fitted check that there are no leaks from either the inlet or the outlet connections. Test the valve by raising the system pressure. Check that the valve operates at the correct set pressure. Reduce the system pressure to the normal operating pressure and check that the safety valve reseats.
- Page 16 10%. The SV615 achieves its rated capacity at 5% overpressure on steam, 10% on air. If the valve is set too close to the operating pressure of the system the valve may operate prematurely. It will also fail to close satisfactorily when normal operating pressure is restored.
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Page 17: Setting The Valve
Spirax Sarco cannot be held responsible for unauthorised alteration of the set pressure. Although not mandatory, Spirax Sarco recommend that SV615 metal seated valves for steam service should be cold set on a test rig at 3% above the required set pressure. This does not apply if the valve is set on steam. -
Page 18: Maintenance
All safety valves should receive planned maintenance. Note: Before actioning any maintenance work please read 'Safety information', Section 1. It is recommended that Spirax Sarco safety valves are returned to your local Spirax Sarco agent for a thorough overhaul periodically (please read 'Returning products', Section 1.17). - Page 19 IM-P316-03 CTLS Issue 14...
- Page 20 IM-P316-03 CTLS Issue 14...
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