Pipe Supports and Restraints.ppt

7/27/2019 Pipe Supports and Restraints.ppt

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Pipe Suppor ts and Restraints


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Function of supports and restraints:

To carry load

To ensure that material is not stressed beyond a

safe limit

Holdup of liquid can occurred due to pipe sagging

(allow draining)

To permit thermal expansion

To withstand and dampen vibrational forces applied

to the piping

Piping comp onents: pipe supports and restraints


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Supports:

Absorb system weight

Reduce:

longitudinal pipe stress

pipe sag

end point reaction loads



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Restraints

Control, limit, redirect thermal movement

Reduce thermal stress

Reduce loads on equipment connections

Absorb imposed loads

Wind Earthquake

Slug flow

Water hammer

Flow induced-vibration



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Support and Restraint Selection Factors:

Weight load

Available attachment clearance

Availability of structural steel

Direction of loads and/or movement

Design temperature Vertical thermal movement at supports



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Piping components: pipe suppor ts and restra ints (r ig id supp ort)


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Piping components: pipe suppor ts and restra ints (hanger support)


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Piping com ponents: pipe supp orts and restra ints (f lexib le supp ort)

Rigid hangers are normally used at locations where no vertical

movement of the piping occurs.


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Flexib le Suppo rts



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Flexib le Suppo rts



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Flexib le Suppo rts



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Pi i i d i (f l ib l )


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Pi i t i t d t i t ( h id )


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Anchor

Full fixation Permits very limited (if any) translation or

rotation

Guide

Permits movement along pipe axis

Prevents lateral movement

May permit pipe rotation

Piping com ponents: pipe sup ports and restra ints (ancho r, guide)

Pi i t i t d t i t (R t i t A h )


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Piping com ponents: pipe supp orts and restra ints (Restraints - Anch ors)

Pi i t i t d t i t (R t i t G id )


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Piping com ponents: pipe sup ports and restra ints (Restra ints - Guide)

Piping com ponents: p ipe supp orts and restra ints (Pip ing and suppo rt arrangement)


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Piping can be arranged

On piperacks

Near grade on sleeper

In trench

Near steelwork or equipment

Piping com ponents: pipe supp orts and restra ints (Pip ing and suppo rt arrangement)



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Pipeway:

Is the space allocated for routing several parallel

adjacent lines Group lines in pipeway

Piperack

Is a structure in the pipeway for carrying pipes andis usually fabricated from Steel, Concrete & steel,also provide protected location for ancillaryequipment (pump, utility station, )

Piperack shape termed tee-head support

Piping com ponents: pipe supp orts and restra ints (Pip ing and suppo rt arrangement / supp ort def in i t ion)

Pi i t i t d t i t (P i i d t t / t d f i i t i )


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Piperack consist:

Bent: Connected shape frame

Stanchion:

The vertical member of bents are

termed stanchion

Piperack arrangement:

Single deck

Double deck,

Piping com ponents: pipe supp orts and restra ints (Pip ing and suppo rt arrangement / supp ort def in i t ion)

Pi i t i t d t i t (P i i d t t )


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Arrangement of pipe on suppor t :

Usually 2 < NPS < 12 mounted on piperack and

larger pipes are mounted on sleeper

Mounted large diameter pipe near stanchion for

uniform distribution of load


Pi i t i t d t i t (P i i d t t )


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Hot pipe usually insulated and mounted on shoes


Piping com ponents pipe s pp orts and restra ints (Pip ing and s ppo rt arrangement)


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Other type of shoes




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Use bracket or outrigger for

Installation of electrical and instrument tray

Pipes with slope




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Group requiring expansion loop at one side ofthe pipe rack

Design hanger for 2 and larger pipe




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For better stress distribution in the pipe wall,saddle used on large line and used for lines that

twist over when moving




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Provide guide for long straight pipes subject tothermal movement




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The smallest size of pipe run on a piperack 2

If necessary, suspend pipe smaller 2 from 4 andlarger

For making horizontal branch, change height of pipe




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The most economic beam section desired for thepiperack

If more room is needed, make double or triple piperack


20 -25 ft

> 6 ft



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Categorize piperack, for example if using double deck,place utility service piping on the upper level of thepiperack


Utility service

process

Determine by lifting equipment required access



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Dont install pipe on stanchion, this will preventadding another deck

Consider sufficient space beside piperack


10 ft



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Ensure that nozzles on equipment are free fromtransmitted by the piping

Equipment suppliers will state max. loadingpermissible at nozzles




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Dummy leg length



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For line smaller than 2 and non-critical arrangesupports in the field

Pocketing of liquid due to sagging can be eliminatedby sloping the line so that the difference in heightbetween adjacent supports is at least equal to tripledeflection at the midpoint

As a rule of thumb, spans for insulated lines shouldbe reduced by approximately %30 from those foruninsulated pipes



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Support piping from overhead, in preference tounderneath

Install flange, with 12 minimum clearance fromsupporting steel

>12

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Keep weld joints at least 3 from supporting steel orother obstruction

To carry the weight of the piping use a FOS = 3

In general, one hanger or other support should bespecified for each side of a valve.

>2

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Field support

For line smaller than 2 and non-critical, arrangesupports in the field

Finding location of support

Pip ing c omponents: p ipe supp or ts and rest ra in ts (p ip ing suppor t document )


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Pip ing c omponents: p ipe supp or ts and rest ra in ts (p ip ing suppor t document )


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Piping comp onents: pipe supports and restraints (pip ing sup port drawing)


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Documents

Pipe Supports and Restraints.ppt