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Title : General Specification For Erection Of Piping
1. General
This standard lays down guidelines for the selection and
application of pipe supports and covers standard types and installation. The
modification of the standard types of piping supports described in this standard
may be made only in exceptional cases.
2.0 GENERAL REQUIREMENTS
2.1 The supporting systems shall provide for and control the free or intended movement of the piping including its movement in relation to that of connected equipment. Vibration in the pipe shall be taken care of while deciding supports.
2.2 A careful study shall be made of the piping layout in relation to the surrounding structure, adjacent piping and equipment before selecting the type of support to be used at each supporting point. Maximum utilization of the existing structures shall be made for supports.
2.3 Supports shall be selected to withstand all static and dynamic condition of loading to which the piping and associated equipment may be subjected.
Load calculation where required shall give consideration to the following;
2.3.1 Weight of pipe, valves, flanges, fittings, insulating materials, suspended hanger component and normal fluid contents.
2.3.2 Weight of hydrostatic test fluid or cleaning fluid if normal operating fluid content is lighter.
2.3.3 Additional loading that may occur during erection.
2.3.4 Intentional use of restraint against thermal expansion.
2.3.5 Reaction forces due to operation of safety and relief valves.
2.3.6 Wind loadings on outdoor piping.
2.3.7 Lateral friction force on the trestles due to expansion of pipe.
3.0 Material
3.1 Materials is of supports shall be as per individual supports standards and shall be used within the temperature limitations mentioned therein.
3.2 Pipe supporting elements subject to corrosion or electrolysis shall be suitably protected.
4.0 Dimensional requirements
4.1 Hangers and supports shall be dimensionally compatible with the outside diameter of pipe or if specified the outside diameter of the insulation.
4.2 Hangers for the suspension of DN 50 and larger pipe shall be capable of adequate vertical adjustment.
5.0 Details of types of supports and application
5.1 The selection of hangers and supports shall be made to provide the piping system with the degree of control that its operating and design characteristics require. The simplest assembly of components that fulfills this requirement shall be most desirable. Typical uses and limitations of standard supports shall be as indicated in sheets 4,5&6 of this standard.
Note: The standard types shown are grouped into four categories as follows:
- Supports for un-insulated non-vibrating pipes at ambient temp (< 65c)
- Support for vertical insulated/bare pipe of temperature < 200C when vibrations not present.
- Supports for horizontal cold insulated pipe in the absence of vibrations.
- Supports for bare or insulated pipe temp < 500C.
- Special supports.
- Spring supports
- Piping supports for pipe lines at temperatures above 500oC are critical and shall be decided more carefully considering piping layout, flexibility and the equipment to which the piping is connected.
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