The Piping System is a complex and rigid network consisting of various piping components, piping special items, instruments, which have different dimensions and weights.
The primary function of supports is to take the dead weight of the piping system. Supports are also being used to direct and control the thermal movement of the piping system ,so that the heavy thermal Loads on connected Equipments / Machines can be avoided and interference with adjoining Pipe /Structure can be avoided. Supports are also required to prevent movement / vibration due to Pulsation, Wind, Earth quake,shock,pressure thrust ,etc.
This is generally accomplished by providing external attachments known as pipe Supports at various locations of the piping system.
Pipe support is an integral part of piping design and flexibility analysis.
The piping designer’s familiarity with support specification,accepted practices, and commercially available pipe support components and their applications is extremely important. Layout study of Equipment and structural locations is essential for the most effective design of the piping system and its associated supports. Early decisions must be reached as to the type and method of supporting the Critical Piping during the initial layout study.
Piping Specification is a document prepared by the support engineering group during detail design of a project which provide information of the type of support ,support naming philosophy, special supports,materials used,support span,guidelines for selecting a support.
Pipe support specifications should be written in such a way that it will
· Ensure proper support to piping system under all operating and environmental conditions · to provide support for lines which are sloped · lines which are under thermal expansion · to provide anchorage points for flexibility of the lines · to provide insulation protection · the supports should be factory standard · appropriate materials to avoid corrosion
The B31.3 guidance for pipe support types and materials of construction is presented in B31.3 Table 326.1, Listed Standard, MSS SP-58.
The list of objectives set out in Code B31.3.
The objectives of the layout and design are to PREVENT these occurrences: • Piping stresses in excess of those permitted by the code. • Leakage at joints.( If flanges support the weight of the pipe they may start to leak) • Excessive loads and moments to connected equipment. • Excessive stresses in the supporting elements • Resonance with any vibration. • Excessive interference with expansion or contraction otherwise sufficient • Unintentional disengagement from the support • Excessive sagging in piping • Excessive distortion or sagging of piping subject to creep. • Excessive heat flow subjecting supporting elements to temperatures outside their design limits.