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PIPE SUPPORTS SP-421
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DESIGN GUIDE PIPING
----------------------------------------------------------------------------------------------------------------------------Approved SIGNATURES ON FILE Date
1.0 SCOPE
This guide covers the selection and design of hangers and supports for process and utility piping. This guide does not apply to clean room areas.
2.0 REFERENCES
Pipe hangers and supports, materials and design shall be in accordance with MSS Standard Practices SP-58, SP-69, SP-89 and SP-90 and also conform to the latest requirements of the ANSI code for Pressure Piping B31.1 and Chemical, Petroleum Piping B31.3.
3.0 GENERAL
3.1 Temperature for the hangers and supports per this guide, except when otherwise specified or permitted, shall be within the pipe line fluid temperatures of -20° to +750° F. The parts of hangers and support in direct contact with the pipe shall be considered to be at the temperature of the pipe line fluid. Parts not in direct contact with the pipe or entirely outside of any insulation may be considered to be at 1/3 of the pipe line fluid or at ambient temperature, whichever is greater.
3.2 Hanger and Support Loads as follows shall be used in determining the weight to besupported or the forces to be resisted:
3.2.1 Weight Effects:
Dead Load - Weight of all permanent loads (pipe, valves, insulation, etc.)Live Load - Weight of the conveyed fluid including snow and ice where
applicable. Test Load - Weight of test fluid. For fluids lighter than water, the weight of
water shall be used.
3.2.2 Dynamic Effects
Impact forces, shall include vibration, and the greater of either, wind or earthquake forces. The weight or forces to be taken by the hangers and supports shall be the most severe combination of weight and dynamic effects. Under no circumstances shall the spacing specified for carbon steel pipe or maximum loads specified herein be exceeded. When necessary, the effect of the weight and dynamic forces
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3.0 GENERAL, continued
(particularly on laboratory buildings) on the supporting structure (building steel, etc.) shall receive consideration. Where vibration is deemed to be of particular concern, Grinnell Series 300 Springloaded hangers shall be used.
3.2.3 Slide Surfaces
All piping supports and guides having steel to steel sliding surfaces shall have liberal coating of graphite paste applied during installation. Where pipe supports or guides rest on concrete, sliding contact shall be achieved by imbedding a slide plate in the concrete and lubricating as above. Sliding contact between concrete and steel is prohibited.
3.3 Materials
Hangers, spacers, small plates, lugs, etc. may be commercial quality carbon steel provided these items are not subjected to temperatures over 650°F. Grinnell Co. materials are considered as being a representative of the required quality. The use of other suppliers' materials of equal quality shall be considered. Grinnell figure numbers are used in all following pages of this guide. Note that where copper lines are installed, either copper hangers or plastic tape-lined steel hangers shall be used.
4.0 USE OF THE GUIDE
4.1 Procedure
4.1.1 Using the PH, PA, PG or PS number corresponding to the hanger or support selected, reference shall be made to pages 4-28 for recommendations.
Legend PH-100 Series - Pipe HangersPA-200 Series - Pipe AnchorsPG-300 Series - Pipe GuidesPS-400 Series - Miscellaneous Pipe Supports
4.1.2 Details are shown to cover the majority of installations. If a situation arises which is not covered by the guide, consult with the Central Engineering Piping Group.
4.1.3 The General Notes on page 6 apply to all details where welding issued.
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5.0 APPLICATION
5.1 The appropriate detail shall be referenced on the orthographic and/or isometric piping drawings, with dimensions locating each support and its assigned number.
TABLE ITHE MAXIMUM HORIZONTAL SPANS OF PIPING AND TUBING
(THE SPACING BELOW ARE FOR THE PIPE FILLED WITH LIQUID)
PIPESIZE
SCH. 40 & HEAVIER STL. NON-INSUL INSUL
SCH. 5 & SCH. 10 SS NON-INSUL INSUL
POLYPROPYLENE PIPE (AMBIENT)
COPPER & S.S. TUBING
1/2” 6’-0” 4’-6” 6’-0” 4’-0” 4’-0” SCH. 80 5’-0”3/4” 8’-0” 5’-6” 8’-0” 5’-0” 4’-0” SCH. 80 5’-0”1” 11’-6” 10’-0” 11’-6” 10’-0” 4’-6” SCH. 80 6’-0”1 1/2” 13’-9” 12’-6” 13’-9” 10’-9” 5’-6” SCH. 40 6’-0”2” 15’-3” 14’-3” 15’-3” 12’-5” 5’-3” SCH. 40 8’-0”2 1/2” 17’-0” 15’-9” 17’-0” 13’-9” - 9’-0”3” 18’-6” 17’-3” 18’-0” 15’-3” 6’-3” SCH. 40 10’-0”4” 22’-3” 20’-0” 19’-3” 16’-3” 6’-9” SCH. 40 10’-0”5” 24’-0” 22’-0” 20’-0” 18’-0” - -6” 26’-0” 24’-0” 20’-6” 19’-3” 8’-0” SCH. 40 -8” 28’-9” 25’-0” 19’-3” 21’-3” 8’-6” SCH. 40 -10” 31’-6” 25’-0” 13’-6” 22’-0” 9’-6” SCH. 40 -12” 33’-6” 25’-0” 13’-6” 22’-0” 10’-0” SCH. 40 -14” 33’-6” 25’-3” 13’-0” 22’-0” - -16” 25’-6” 26’-0” 26’-0” 22’-6” - -18” 20’-0” 26’-6” 26’-0” 23’-0” - -20” 15’-6” 28’-0” 26’-6” 23’-3” - -24” 32’-3” 28’-0” 27’-6” 23’-3” - -28” 32’-9 28’-3” 28’-0” 24’-3” - -30” 32’-9” 28’-3” 28’-0” 24’-3” - -36” 33’-6” 29’-0” 28’-0” 24’-3” - -42” 34’-0” 29’-6” 28’-9” 25’-0” - - TO BE SUPPORTED ON SADDLE AND 4” ABOVE THE STEEL TO INCREASE TO 24’-6” IF PIPE IS SUPPORTED ON SHOE
The above spans are limited to: 1) Maximum deflection of 3/8” 2) Maximum bending stress at mid span of3000 PSI
3) Maximum bending stress at saddle 4) Maximum hoop stress of 9000 PSI.of 1000 PSI Due to line reaction at the support.
NOTE: Spans shall be shortened as necessary to compensate for concentrated loads such as valves & instruments and vertical runs of pipe, concentrated loads to be supported as close to the load as possible in order to keep bending stresses to a minimum. Reduce spans by one-fourth where changes of direction occur.
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