Pipe Support Standard [PDF]

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PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 2 OF 28 DSN: 5976

CONTENTS

1.

SCOPE ....................................................................................................................................................... 3

2.

REFERENCE DOCUMENTS ..................................................................................................................... 3

3.

DESIGN BASIS .......................................................................................................................................... 3

4.

PIPE SUPPORT DESIGN AND SELECTION CRITERIA.......................................................................... 4 4.1 Selection Guidelines ........................................................................................................................ 4 4.2 Pipe Spans ........................................................................................................................................ 5 4.3 Welded attachments ........................................................................................................................ 5 4.4 Other Requirements ......................................................................................................................... 6

5.

PRESENTATION ....................................................................................................................................... 7 5.1 Identification ..................................................................................................................................... 7 5.2 Numbering ........................................................................................................................................ 7

6.

SCOPE OF SUPPLY ................................................................................................................................. 8 6.1 Basis .................................................................................................................................................. 8 6.2 Material .............................................................................................................................................. 8 6.3 Alternative Material .......................................................................................................................... 9 6.4 Traceability and Identification ........................................................................................................ 9

7.

INSTALLATION ......................................................................................................................................... 9

8.

SUPPORT OF SMALL BORE PIPING IN THE FIELD............................................................................ 10 8.1 General ............................................................................................................................................ 10

9.

FIREPROOFING SECONDARY PIPE SUPPORT MEMBERS ............................................................... 11 9.1 Extent of Fireproofing: .................................................................................................................. 11 9.2 Application Procedure: .................................................................................................................. 11

ATTACHMENT 1 CARBON STEEL PIPE SPANS ....................................................................................... 14 ATTACHMENT 2 STAINLESS STEEL & HASTEALLOY PIPE SPANS ...................................................... 15 ATTACHMENT 3 – CARBON STEEL, STAINLESS & HASTEALLOY STEEL GUIDE SPACINGS ............. 16 ATTACHMENT 4 – REINFORCEMENT AT SUPPORT LOCATION .............................................................. 17 ATTACHMENT 5 – PREFERED STRUCTURAL STEEL SECTIONS ............................................................ 18 ATTACHMENT 6 – PIPE SHOE SELECTION TABLES ................................................................................. 19 ATTACHMENT 7 INDEX OF PIPE SUPPORT STANDARDS ...................................................................... 23

PIPING GROUP ENGINEERING STANDARD

1.

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 3 OF 28 DSN: 5976

SCOPE This standard shall specify the minimum requirements for the design, selection, fabrication and installation of pipe supports associated with the bulk piping scope for PROJECT LION PHASE 2 SINGAPORE.

2.

REFERENCE DOCUMENTS FW Project Specifications (SP) • •

0470 8230 SP 00 0006 0470 8230 SP 00 0001

Piping Stress Analysis Procedure Typical Piping Details and Standards

AFTON Specifications • • • •

58OP62XX E02 E020 00002 Piping Engineering Design Basis SP 93 1 Paint and Coatings Specification SP 92 1 Hot Insulation Specification SP 92 2 Cold Insulation Specification

3.

DESIGN BASIS

3.1

The following codes and specifications have been used in the design and drawing of these standards. • • •

British Standard BS 5950: Part 1: The use of Structural Steel in Buildings British Standard BS 3974: Part 1&2: Pipe Supports British Standard BS 499: Part 2: Welding Terms and Symbols

3.2

Calculations have been based upon the use of steel in accordance with British Standard BS EN 10 025 Grade 430A (S.275). Steel of equal properties may be used.

3.3

Friction forces on the support, induced by movement of the supported pipe, have been calculated on the basis of a friction coefficient. • • •

3.4

Steel to Steel = PTFE on PTFE or polished Stainless Steel = Steel on Concrete =

0.3 0.1 0.6

All welds to be continuous 6mm (leg length) unless stated otherwise. Stitch welding of supports is to be avoided.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 4 OF 28 DSN: 5976

3.5

Bolting shall be Grade 8.8 in accordance with BS 4190. Bolts are to be hot spun galvanised supplied complete with matching washer, nut & locking nut.

3.6

The standard pipe supports contained within this document are of welded construction. Generally, they can be utilised if required in their entirety for a bolted installation, in which case the requirement shall be added to the relevant contract documentation.

3.7

The standard pipe supports contained within this standard are required to include a rubbing bar arrangements on horizontal bearing surfaces to minimise corrosion. This also includes all horizontal points of support on new and existing structures.

3.8

The standard anti corrosion protection for pipe supports shall be in accordance with SP 93 1 for Specific Coating Specification.

4.

PIPE SUPPORT DESIGN AND SELECTION CRITERIA This section of the standard is aimed primarily at the Pipe Designer responsible for the design and selection of pipe supports. Selection Guidelines

4.1.1

The overriding philosophy in pipe support selection is the maximisation of standard supports, hence minimising the requirement for special pipe supports (SPSs). Where special pipe supports are used they shall be designed where possible using the standard steel sections listed in attachment 5. Avoid generating a special pipe support drawing where it is possible to use a standard support with notes (e.g.: “weld shoe on top of pipe”).

4.1.2

Where standard supports are used for pipe sizes above the limits stated, a design check shall be undertaken as part of selection. The addition of the larger pipe size written after the support type thus, PS 23B (12" NPS), shall be taken as an indication that this check has been undertaken.

4.1.3

Similarly, where standard supports specify the use of larger or smaller sections than those listed in the standards a design check shall be undertaken. The addition of the required steel section written after the support type, e.g. PS 1 (203 x 133 UB30) shall be taken as an indication that this check has been undertaken.

4.1.4

Standard support details making reference to other attachments, to both pipe and steelwork include information on safe loads. These loads are based on the components specified and not the strength or rigidity of the supported pipe, supporting steel or structural base, which shall all be assessed and checked separately.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 5 OF 28 DSN: 5976

4.2

Pipe Spans

4.2.1

Horizontal piping shall be supported at sufficient distances to prevent excessive sagging, this is particularly important at changes in direction where a factor of 0.65 shall be applied to the allowable spans. In severe cases, sagging can undermine plant operation and pockets become difficult to drain.

4.2.2

Sloping lines shall be supported such that free draining can be achieved (as noted within Typical Piping Details and Standards (0470 8230 SP 00 0001).

4.2.3

The standard pipe spans for carbon steel and other metallic piping systems are shown in attachments 1 and 2. These indicate the maximum straight length of pipe allowed between supports. This is based on methods for calculating the maximum pipe span limited by stress or deflection (either continuous beam or single span), whichever gives the lesser span.

4.2.4

Pipe spans have been based on pipes subject to a Uniform Distributed Load (UDL). Maximum spans are indicated for lines empty and full either insulated or un insulated. Un insulated lines have been assessed for indentation from rubbing bars (point contact). Reinforcement pads are specified where required to prevent localised overstressing of the pipe wall and to maintain the calculated pipe spans.

4.2.5

Pipe spans for non metallic piping are to be in accordance with manufacturer recommendations.

4.2.6

Maximum guide spacing for straight pipe runs is shown within Attachment 3.

4.3

Welded attachments

4.3.1

Supports for all CS piping in any service temperature and for alloy piping in intermittent service temperature less than 250 °F (121°C) shall be constructed of I and H beam sections of CS material. All structure steel shall be open structural shape such as angle, channel, I and H beam. Closed structural shapes such as tubes, pipes and box members are not permitted.

4.3.2

Trunnions to grade or steelwork shall be specified on the fabrication drawing. Exact lengths of trunnions shall be stated with any adjustment taken up by concrete grout or suitable packing. In principle trunnion lengths will be kept to a minimum, reducing the stresses on the parent pipe wall by practical Support/structural/civil engineered solutions.

4.3.3

Welded attachments to lines with design temperatures below 0 C should be fabricated from parent pipe material or equivalent plate material as applicable. Material grades to be used in such applications must be checked to ensure that the material is capable of low temperature application e.g. impact tested etc.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 6 OF 28 DSN: 5976

4.3.4

All horizontal un insulated piping shall rest on rubbing bars. Vertical piping shall be isolated from the support structure.

4.4

Other Requirements

4.4.1

Piping supported from other pipe shall be minimised.

4.4.2

Pipe reinforcing at the location or point of line support in horizontal pipe runs shall be as per Attachment 4.

4.4.3

Sloping lines shall be supported using standard shoes trimmed to suit (down to a minimum of 50mm, if insulation thickness allows) or shimmed to suit for smaller make up dimensions. Drawings shall be marked ‘TRIM TO SUIT’ or ‘SHIM TO SUIT’ as necessary.

4.4.4

The top of concrete plinths are to be a minimum of 150 mm above finished grade or high point of paving.

4.4.5

A fireproofed catch beam shall be installed beneath piping containing flammable material where such piping is hung by rods or spring type supports from a fire proofed pipe crossbeam.

4.4.6

Hanger rod supports shall be of sufficient length to enable the swing caused by the pipe horizontal movement from resulting in an undesired vertical displacement. The maximum angle from vertical shall be +2.5o (Total 5o).Maximum advisable length of hanger rod < 2.0 M.

4.4.7

For acid tiled areas suspended or cantilevered supports should be used wherever possible. Floor mounted supports shall be minimised by grouping and using common support plinths. Plinths shall be of sufficient height to allow tiling and shall be positioned such that they do not impede draining. Materials for the pipe support base shall be determined for the particular project application.

4.4.8

Supports shown in the Support Standards (attachment 7) are fabricated from structural grade carbon steel which is non impact tested and becomes brittle at low temperatures. Supports bolted directly to piping should not be used on lines with a minimum design temperature of less than 0oC without use of an isolating barrier equivalent to Tico clip strip (or equivalent) (SX 99). Use ‘cold supports’ for cryogenic lines.

4.4.9

Guide for pipe shoe selection. See attachment 6.

PIPING GROUP ENGINEERING STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 7 OF 28 DSN: 5976

PIPE SUPPORT STANDARD

5.

PRESENTATION

5.1

Identification

5.1.1

Pipe support types and locations will be shown on the piping fabrication drawings.

5.1.2

Where special pipe supports (SPS’s) are required these will be detailed and numbered outside the scope of this standard. As a consequence, a project SPS index and SPS detailed drawings will be issued.

5.2

Numbering

5.2.1

Numbering of standard pipe supports will be in accordance with the type numbers listed in attachment 7 Index of Standard Pipe Supports.

5.2.2

The following table indicates the diameter/letter used for pipe diameters throughout the pipe support standard details.

5.2.3

Pipe Size NPS Letter Ref

½"

¾"

1"

1½”

2"

3"

4"

6"

8"

A

B

C

D

E

F

G

H

J

Pipe Size NPS Letter Ref

10"

12"

14"

16”

18”

20"

22"

24"

26”

K

L

M

N

P

Q

R

S

T

Pipe Size NPS Letter Ref

28”

30”

32”

34”

36”

38”

40”

42”

44”

U

V

W

X

Y

Z

AA

AB

AC

The following table indicates the diameter/letter used for rod diameters throughout the pipe support standard details.

Rod Dia Letter Ref

M10

M10

M10

M12

M12

M16

M16

M16

M20

A

B

C

D

E

F

G

H

J

PIPING GROUP ENGINEERING STANDARD

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PIPE SUPPORT STANDARD

Rod Dia Letter Ref

M20

M24

M30

M30

M36

M36

M36

M42

K

L

M

N

P

Q

R

S

5.2.4

The numbering system for special pipe supports (SPS’s) and spring supports (SH) will be given as 0470 SPS YYYY and 0470 SH YYYY respectively, Where YYYY is the sequence number (0 to 200 for Ashless and above 201for ZDDP) within the relevant schedules.

6.

SCOPE OF SUPPLY

6.1

Basis

6.1.1

The basis of this standard is that pipe supports will be on a supply, fabricate and erect sub contract, either by the main piping fabricator or possibly as part of a specialist pipe support supplier, hereafter referred to as ‘the contractor’.

6.1.2

FW will design or specify pipe support components of all piping used within these standards. Where SPS’s are required, these will be separately detailed and numbered.

6.2

Material

6.2.1

To aid the contractor and to reduce material wastage, principle dimensions will be indicated against the support type on the relevant piping drawing. eg. PS 46 (A=750, B=750, C=1200) These dimensions are nominal, generated from available information, with no account taken for accumulation (either positive or negative) of tolerance within concrete, steelwork or pipe work. The contractor shall be responsible for determining the actual dimensions prior to the installation of each support and to adjust the applicable dimensions to ensure that each support is satisfactorily installed. After correct installation, it is also the contractor’s responsibility to trim back the evidence of any excess material.

6.2.2

The Contractor(s) shall keep detailed reconcilable accounts of all pipe support material for review by FW.

6.2.3

The Contractor shall be responsible for a pipe support MTO and hence any shortage or excess in pipe support material.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 9 OF 28 DSN: 5976

6.3

Alternative Material

6.3.1

The pipe supports generally use a selection of British Standard steel sections as listed in attachment 5. If these sections are not available, the contractor shall propose to FW a suitable alternative for approval.

6.4

Traceability and Identification

6.4.1

The Contractor shall be responsible for developing an identification system that ensures the traceability of pipe supports within the fabrication yard. Similarly, the Contractor shall be responsible for the identification of supports fabricated for on site erection.

6.4.2

The pipe support identification shall be stamped and painted on the completed support together with (where applicable) the principle dimensions to which the support was fabricated. eg PS 46D (A=750, B=750, C=2100) +fabricators unique identification.

6.4.3

Pipe shoes are interchangeable, hence the unique identification may be omitted, provided the shoe is clearly painted and stamped with its type and (where applicable) size.

7.

INSTALLATION

7.1

Pipe supports will be generally of welded construction. The welded area must be thoroughly cleaned and treated in accordance with SP 93 1 Paint and Coatings Specification for Lion project.

7.2

A final bolted installation shall be used in designated Hazardous areas or where deemed prudent. The structural steel will be site drilled by the contractor for this purpose and made good in accordance with SP 93 1 Paint and Coatings Specification for Lion project. The Contractor shall size, select and supply suitable nuts, bolts, washers, locknuts and also decide suitable back marks, centres and drill the affected structure to suit.

7.3

Care must be taken to ensure that ‘U’ Bolts are tightened on to the pipe only where it is required to anchor the line against all movements (eg to support vertical piping). Elsewhere, ‘U’ bolts should be adjusted to allow axial movement of the pipe.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 10 OF 28 DSN: 5976

8.

SUPPORT OF SMALL BORE PIPING IN THE FIELD

8.1

General

8.1.1

Pipe supports which are particularly appropriate to small bore piping are those shown as PS 105 Small Bore Pipe Supports 1 1/2” NPS and below. PS105 shall be used in conjunction with shoes where required.

8.1.2

Also the following guidelines have been included to assist the designer (or the contractor) in undertaking this scope. Failure to do so may cause damage, not only to the support, but also to the pipe, vessel or other equipment to which it is attached.

1.

Provision must be made for expansion of the pipe in service. It can be assumed that a 10 metre length of carbon or low alloy steel pipe will increase by 11.5mm for every 100 ºC rise in the metal temperature. Stainless steel pipe will expand at a rate approximately 30% greater. Anything, which tends to interfere with this expansion will cause bowing and possibly damage to the terminal connections.

2.

Temperature in service will cause vertical vessels to grow upwards (or downwards) from the supporting base, horizontal vessels and heat exchangers to move from the fixed end and pipe to move from the anchor, line stop or, in the case of a vertical pipe, from the fixed support. Any small bore branch piping is to be routed with sufficient flexibility and to be supported in a manner, which will allow the smaller pipe to move with the imposed movement.

PIPING GROUP ENGINEERING STANDARD

9.

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 11 OF 28 DSN: 5976

FIREPROOFING SECONDARY PIPE SUPPORT MEMBERS Secondary pipe support members (small lateral pipe racks, independent stanchions, individual T columns, columns with brackets etc.) supporting pipes carrying Flammable, Combustible and Toxic materials need to be fireproofed when these lines are located within the fire protection zone (FPZ) and line size is greater than 3” to satisfy Singapore Fire Safety Guidelines. For Afton Phase 2 project, fluid codes identified based on above criteria are ADP, PBS, AP, GZ, JZ, AD, IPA, AAL, EH, ISB, MPL, HSG, THA and SHS. Additionally, secondary pipe support members of fire water distribution headers, sub headers supplying more than one facility to be fire proofed. Fireproofing requirement for pipe supports of these lines are marked on piping isometric drawing as ‘FIREPROOF’.

9.1

9.2

Extent of Fireproofing: •

Extent of fire proofing requirement within FPZ applied to pipe supports shall be governed by

•

Fireproofing of columns and cross beam members shall extend up to the support level of the piping

•

Fireproofing of horizontal beams shall be carried up to and including the next supporting column.

•

Direct attachments to the pipes such as shoes need not be fireproofed. Fireproofing shall be installed in a manner that it would not impede thermal displacement of piping. Application Procedure: Spray Applied Fire Resistive material applied by spray and/or trowel shall be selected for fireproof of secondary pipe support members. High density cementitious material with min avg density of 55 pcf with min individual value of 50 pcf shall be applied in one or more coats to steel, mesh and lath surfaces. Reinforcing mesh/ Galvanized expanded steel lath secured to column or beam by bending tight around flanges a min of 1 1/2” toward web of column/ beam. Minimum thickness of the fireproofing shall be 1 1/8” (29 mm) based on a 2 hr fire resistance rating according to UL 1709. Fire proofing material shall be Pyrocrete 241 of Carboline or approved equivalent. Fire proofing material supplier shall submit the Fire test result for the required thickness to meet 2 hr fire rating and UL1709 test certificate (performed by certified independent 3rd party laboratory) for approval.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

0470 8230 SP 00 0007 REV. F1 PAGE: 12 OF 28 DSN: 5976

3

1 2

Spray Applied Fire Resistive Material. (Ex. Pyrocrete 241) Reinforcing Mesh or Metal Lath (Mesh no 19 SWG Galv steel wire / Galv Steel Lath weighing 3.4 lb per sq yd) 3- Steel Column/ Beam

Notes: 1. Fireproofing shall be installed in a manner that it would not impede thermal displacement of piping. 2. In general, top surfaces of the secondary support members where pipes/ pipe shoes are resting, need not be fireproofed to enhance free movement of piping. 3. At axial stop locations, fireproofing shall be avoided locally around the stop member providing minimum 50mm free space in lateral direction. 4. Secondary pipe supports attached to Equipment vessel clips need not be fireproofed. 5. Spring supports need not be fireproofed. 6. Fireproofing material shall be properly installed such that it will not be dislodged when subjected to high pressure firewater jet streams

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

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PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

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ATTACHMENT 1 CARBON STEEL PIPE SPANS NPS (“) 1 1.5 2 3 4 6 8 10 12 14 16 18 20 (1) 24 (1)

Wall Thickness (mm.) 4.55 5.08 5.54 5.49 6.02 7.11 8.18 9.27 9.53 9.53 9.53 9.53 9.53 9.53

Maximum Span (m) (2) (3) Insul Un insulated Un insulated Insulated Thk Line / Line/ Empty Line /Empty (mm.) Liquid Fill 63 4.0 3.8 2.7 75 5.0 4.6 3.5 75 5.6 5.2 4.2 75 6.4 5.4 5.1 75 7.3 6.0 6.0 75 8.9 7.0 7.7 75 10.2 7.8 9.1 75 11.4 8.5 10.4 75 12.4 9.0 11.5 75 13.0 9.2 12.1 75 13.9 9.5 13.0 75 14.8 9.7 13.8 75 15.6 9.9 14.6 75 17.1 10.3 16.1 Maximum Recommended Spans Carbon Steel Pipe

Insulated Line / Liquid Fill 2.6 3.3 3.9 4.5 5.2 6.4 7.2 8.0 8.5 8.8 9.1 9.3 9.6 9.9

Notes (Mandatory): 1) For Pad and saddle requirements see attachment 4. 2) Shoes required for all insulated lines. 3) Maximum spacing between pipe supports within units are limited to < 6 m. If a line is spanning between adjacent structures or equipment, the maximum span may exceed 6 m subject to stress engineer approval. Design Basis : • • • • • •

Spans calculated to BS 3974 1 (1974). Maximum design temperature 212°C Maximum piping spans calculated to a stress limit of 25 N/mm² or max deflection 12.7 mm @ mid span, whichever gives the lesser span. Insulation density = 176 kg/m³. Liquid filled lines are assumed full of water. Refer to pipe stress engineer for cases not listed above which are potentially worse considering the following: Pipe supports span exceeding the recommended ones Pipe design temperature Fluid density Other factors (icing, earthquakes, differential settlements, etc.)

PIPING GROUP ENGINEERING STANDARD

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PIPE SUPPORT STANDARD

ATTACHMENT 2 STAINLESS STEEL & HASTEALLOY PIPE SPANS Maximum Recommended Spans Stainless Steel Pipe

Notes (Mandatory):

NPS (“)

Wall Thk (mm.)

Insul Thk (mm.)

Un insulated Line /Empty

Un insulated Line / Liquid Fill

Insulated Line/Empty

Insulated Line /Liquid Fill

1 1.5 2 3 4 6 8 10 12 14 16 18 20 (1) 24 (1)

3.38 3.68 3.91 3.05 3.05 3.4 3.76 4.19 4.57 4.78 4.78 4.78 5.54 6.35

63 75 75 75 75 75 75 75 75 75 75 75 75 75

3.7 4.5 5.0 6.2 7.1 8.6 9.8 11.0 12.0 12.6 13.4 14.3 15.0 16.5

3.4 4.1 4.5 4.9 5.2 5.9 6.4 6.8 7.2 7.5 7.6 7.7 8.3 8.9

2.3 3.1 3.2 4.6 5.4 7.0 8.3 9.6 10.7 11.3 12.1 12.9 13.9 15.4

2.2 2.9 2.9 3.9 4.3 5.1 5.7 6.3 6.8 7.0 7.2 7.3 7.9 8.6

Maximum Span (m) (2) (3)

1) For pad and saddle requirements see attachment 4. 2) Shoes required for all insulated lines. 3) Maximum spacing between pipe supports within units are limited to < 6 m. If a line is spanning between adjacent structures or equipment, the maximum span may exceed 6 m subject to stress engineer approval. Design Basis : • • • • • •

Spans calculated to BS 3974 1 (1974). Maximum design temperature 212°C Maximum piping spans calculated to a stress limit of 25 N/mm² or max deflection 12.7 mm @ mid span, whichever gives the lesser span. Insulation density = 176 kg/m³. Liquid filled lines are assumed full of water. Refer to pipe stress engineer for cases not listed above which are potentially worse considering the following: Pipe supports span exceeding the recommended ones Pipe design temperature Fluid density Other factors (icing, earthquakes, differential settlements, etc.)

PIPING GROUP ENGINEERING STANDARD

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PIPE SUPPORT STANDARD

ATTACHMENT 3 – CARBON STEEL, STAINLESS & HASTEALLOY STEEL GUIDE SPACINGS Pipe Size NPS 2 3 4 6 8 10 12 14 16 18 20 24

Maximum Guide Spacing (m) Vertical Lines 7.3 8.2 8.8 10.1 11.3 12.5 13.7 14.3 15.3 16.2 17.1 18.3

Horizontal Lines 6 12 12 12 18 18 18 18 24 24 24 24

Notes: 1. 2.

The above table is applicable to straight pipe runs. In locating guides full consideration must be given to the dangers of local increase in loads and stresses within pipe or equipment.

PIPING GROUP ENGINEERING STANDARD

PIPE SUPPORT STANDARD

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ATTACHMENT 4 – REINFORCEMENT AT SUPPORT LOCATION Pipe reinforcing at locations of point or line support for horizontal pipe runs shall be per the following: Pipe Diameter – D

Diameter/Thickness [inch/inch (mm/mm)] (1) All D/t < 95

D