Engineered Spring Supports (Practical, Hands-on Approach) Webinar

Piping Technology & Products, Inc.

and wholly owned subsidiaries: US Bellows Sweco Fab Pipe Shields

Anchor/Darling Ent.

Presents:

Engineered Spring SupportsEngineered Spring SupportsA Practical, Hands-on Approach

Presenter: Jerry Godina

Attention Attendees: to listen to the audio portion, check that your speakers or headset are on and turned up OR dial the number and use the access code listed in your confirmation email.

Attention P.E.’s: this Webinar is worth 1 PDH credit for TX P.E.’s (send request to [email protected])

PT&P and Subsidiaries

U.S. Bellows, Inc.

Metallic Expansion Joints

Thin-Wall and Thick-Wall

Rectangular Expansion Joints

Fabric Expansion Joints

Slip-Type Expansion Joints

PIPING TECHNOLOGY & PRODUCTS, INC. - Engineered Pipe Supports - Variable, Constants, Big-tons - Vibration Control Devices – Snubbers, Sway Struts - Support Assembly Components – Clamps, misc. Hardware - Pre-insulated Pipe Supports – Cryogenic/cold & Hot Applications - Fabricated Pipe Shoes, Guides & Anchors

- Slide Bearing Plates

- Anchor Bolts, Embed Plates

IAS Certified, Member of MSS, SPED, APFA

Member of EJMA

SWECO Fab, Inc.

Pressure Vessels

Pig Launchers/Receivers

Spectacle/Line Blinds

Instrument Supports

ASME/Misc. Fabrication

ASME U-Stamp & R-Stamp

Pipe Shields, Inc.

Insulated Pipe Supports

Commercial & Light Industrial

Heavy Industrial – Base Mounted Types, Anchors

Pipe Riser ClampsISO 9001-2000 Certified

Fronek A/D Ent., Inc.

Hydraulic Snubbers

- Short & Adjustable Strut

Mechanical Snubbers

dynA/Damp Compensating StrutASME Nuclear Certified

Spring Hanger Design

Calculate hanger loads due to piping weight

Calculate thermal movement of piping at each hanger location

Determine hanger locations

Select hanger type

Check clearances

1 2 3 4 1 2 3 4 5 5

Basic Steps in Design

Terms to KnowVariable Spring: difference in load / small movements

• Cold Load: spring setting at start of cycle

• Hot Load: spring setting at end of cycle

• Movement: distance between hot and cold load

Constant Spring: same load / large movements

• Design Load: spring setting at all points

• Actual Travel: calculated pipe movement

• Total Travel: maximum movement available

Variable and Constants

•Travel Stop: spring locking device

•Size: how much load / weight spring will carry

•Model: number of coils and sequence

•Type: how spring attaches to structure

Variables vs. Constants

1.) Relatively small thermal deflections, usually less than or equal to 2" are anticipated

2.) A difference in the supported load from the installed to the operating condition is acceptable

1.1.) Large thermal movements, with standard designs up to 14" and custom designs 36" or greater

2.2.) No difference in the supported load from the installed to the operating condition

Upper Travel Stop

Name Plate

Upper Attachment

Lower Travel Stop

Load Column

Variable SpringNew Condition (when delivered)

PTP 2-100 B-Type Variable

Travel Stop

Name Plate

Upper Attachment

Indicator Slot

Turnbuckle

Constant SpringNew Condition (when delivered)

PTP 100 B-Type Size 60 Constant

Load Adjustment Scale

Variable SpringInstallation Guidelines

Adjustable Load Column

Overall Installation

Height

Load Indicator

1. Secure to base

2. Set installation height

3. Complete testing

4. Remove lower travel stop

5. Set to cold load

6. Remove upper travel stop

Variable SpringInstallation Guidelines (vary depending on type)

Types: A, B, C and GTypes: D and E

1.) Rod Attachment 2.) Engagement Verification

Adjustable Load Column

Adjustable by Hex Nuts

Fixed Load Column

Rod Extends Through Spring

Variable SpringThings to Review

1. What is the condition of both attachments?

2. Is the spring over-loaded or under-loaded?

3. Is the spring at correct load set point?

4. Any interference during operation?

5. Any visible damage?

Total Deflection = ½∙Y

Total Deflection = Y

Total Deflection = 2∙Y



Design Features: Spring ConfigurationsVariable Spring

Spring Supports Load & Travel Table

Spring Sizing

Spring Supports Load and Travel Table

Variable Spring

Step 1: Determine a theoretical spring rate

∆ Load / Movement

Given the following design parameters:

A.) Operating Load: 3000

B.) Installed Load: 3300

C.) Movement: ½"

3300-3000

½"

600

Step 2: Review Load and Travel Table Chart

Spring SizingVariable Spring

VARIABILITY = (Spring rate ∙ movement ) /Operating Load


Step 4: Check Variability Factor

VARIABILITY = (600 ∙ ½") / 3000

0.1 equal to 10% ≤ 25%

Final Answer: PTP-2-130

Spring SizingVariable Spring

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Check Hot & Cold Loads

Compress Spring to Cold Load

Compress Spring to Hot Load

Spring Loading/Assembly

Compress Spring to Cold Load & Place in Travel Stops

Remove Spring & Move to Table Using Hoist

Measure and Adjust Load Flange Height if Necessary

Variable Spring


Load Flange

Load Tag: Both Hot (red) and Cold (white) Load Indicators

Installation Instructions

Travel Stops (loaded to your pre-defined cold load)

Hot-Dipped Galvanized

Adjustable Load Column (F-Can)

Max. Hydro-Test = 2x Operating Load

Standard Features

Standard Features

B-Type Variable Springs

F-Type Variables

Variable Spring


Lifting Lugs

Upper & Lower Limit Stops

Collars

Special Paint

Guided Load Columns

Extended Load Columns

Chained Travel Stops

Jacking Bolts

Slide Plates

Extended Load Column

Special Paint

Chained Travel Stops

Slide Plates

Special Features

Special Features

Variable Spring

Constant SpringInstallation Guidelines

1. Secure to stationary attachment

2. Set installation height

3. Complete testing

4. Set to cold position

5. Remove travel stop

Constant SpringInstallation Guidelines (vary depending on type)

1.) Rod Attachment 2.) Engagement Verification

Adjustable Turnbuckle

Travel Stop Pin

Hanger Style

Types: F and U

Travel Stop Rod

Travel Stop Rods

Constant SpringThings to Review

1.What is the condition of both attachments?

2.Is the spring within the total travel range?

3.Is the spring at correct travel position?

4.Any interference during operation?

5.Any visible damage?


Given the Following Design Parameters:

a.) Operating Load: 3000 lb.

b.) Actual Travel: 4 ⅜" up

Step 1: Determine Total Travel:

Rounded up to nearest ½"

a.) When Actual Travel is < 5"

Total Travel = Actual Travel + 1"

b.) When Actual Travel is ≥ 5"

Total Travel = Actual Travel + 20%

Rounded up to nearest ½"

Example:

Total Travel = 4 ⅜" + 1" = 5 ⅜"

5 ½"

Spring Sizing

Constant Spring



Final Answer: Size 41

Spring Sizing

Constant Spring


Constant Spring


Travel Stop Removal

Midpoint of TravelLoad Adjustment

Tagging

Constant Spring


• Load Flange

• Load Tag: Both Hot (red) and Cold (white) Movement

• Installation Instructions

• Travel Stops

• Hot-Dipped Galvanized

• Adjustable Load Column (F-Can)

• Pre-Loaded

• +/- 10% Load Adjustment

Standard Features

Constant Spring


Attachments Travel Stops

“Big Ton” Coating & Mobility

Constant Spring

Spring AdjustmentsCheck Load or Position Settings: Correct if Necessary

Constant Load Adjustment: Minimum 10% Available

Variable Spring Adjust to Load Setting Points

Required Cold Position

Actual Load Position

• Visually inspect each Constant hanger:– Search for signs of visual cracks, fractures,

and corrosion of the spring casing and the following:

• (1) beam attachment• (2) pin • (3) constant hanger attachment• (4) pipe clamp attachment• (5) weldless eye nut• (6) threaded rod• (9) spring coil• (10) Check to see if Travel Stops are

removed– Check (7) turnbuckle (if present), lock nuts

(8) and other threaded items to ensure they are secured and fastened

– Compare the position of the (10) coil with the hot/cold load indicator and operating range of the spring

– Check the mobility of the (11) load column

Before and After Picture of Constant Load Support that

Was Resized

Inspection Check List

Re-calibration:

• Spring hanger missing a name plate

• Operating load range > 15,000 lb.

• Spring is in good operating condition

• Cost of field time & equipment required is less than the cost of new spring hanger

Re-calibration Criteria

Maintenance

Regulation Criteria• If within total travel range• The hanger can be adjusted to the hot/operating

load position• Consider the position of rod (swing angle also)• Consider adjustment of load (+/- 10%)

On-Site Survey & Inspection – Constant Spring

Replacement Criteria:• Signs of excessive corrosion or fatigue• Rust damage of entire unit• Modifications to operating conditions• Consider condition of components (cam

mechanisms, bearings, etc.)

Field Examples

Maintenance - Replace

• Lines/equipment must have a temporary support while repairs are made

• Re-install travel stops when the line is taken out of operation (shutdown) to prevent line/equipment movement and possible readjustment of the springs

• If re-calibration is recommended and name plate is missing, the variable spring should be stenciled at the proper installed and operating positions or provide these loads

• Remove spring hanger assembly

Shutdown/Isolation Procedures

Spring Analysis ExampleOriginal Design

•Horizontal Constants

•5,750 lb. Load

•8-1/2” Total Travel

•B-Type

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Spring Analysis Example

Stress Analysis Results:•Total load = 28,143•Load per spring = approx. 14,000•Original Springs = max capacity = 6,325 (5,750 + 10%)


Spring Analysis Example

Left: Revised overall assembly

Below: Revised constant detail

Recommendation

Value-Added Services

•Piping, pipe support and structural design

•3D modeling technology

•Pipe Stress Analysis

•ANSYS

•Finite Element Analysis

•Special stress/thermal problems

•Pro/E for 3-D Part Design

•ANSYS for Mesh Generation + Analysis + Results Analysis

•Field Testing

Engineering & Design Department


Value-Added Services

• On-site installation guidance• On-site inspection/maintenance of pipe

supports • On-site snubber inspection • A system of stock standard Items• “On-call” engineering team• Available 24x7

PT&P’s “On-call” engineering team guarantees a response time of 30 minutes

Field Services & Emergency Services

www.pipingtech.com

[email protected]

Friday, 5:30pm

Saturday

Sunday

Value-Added Services24x7 Emergency Service for a 48" Expansion Joint

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[email protected]

Cold Shoe Testing Constant Testing

Marinite Slide Plate Testing

Spring Load Testing

Anchor Shoe Testing

Value-Added ServicesProduct Testing

www.pipingtech.com

[email protected]

• > 30,000 spring coils• > 1 million Lb. of standard items• Full year supply of beam, angle, plates, rods…etc.

At Piping Technology & Products, we stock:

Value-Added ServicesInventory & Stocking Capabilities

www.pipingtech.com

[email protected]

www.pipingtech.com

Fatigue Testing

Pressure Balanced

Expansion Joints

FEA: Plate Thickness and Pipe

Stress

Inspection and Maintenance of

Supports

“Over 450 Project

Examples”

Value-Added ServicesTechnical Literature Online

http://www.pipingtech.com/

Thank You for Attending…

Engineered Spring SupportsEngineered Spring Supports

(Practical, Hands-on Approach)(Practical, Hands-on Approach)

Please send any additional questions or inquiries to [email protected]

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Engineered Spring Supports (Practical, Hands-on Approach) Webinar

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Transcript of Engineered Spring Supports (Practical, Hands-on Approach) Webinar