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
Total Deflection = 3∙Y
Total Deflection = 4∙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 3: Review Load and Travel Table Chart
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
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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
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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?
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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
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Step 2: Review Load and Travel Table Chart
Final Answer: Size 41
Spring Sizing
Constant Spring
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Constant Spring
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Travel Stop Removal
Midpoint of TravelLoad Adjustment
Tagging
Constant Spring
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• 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
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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%)
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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
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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
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Friday, 5:30pm
Saturday
Sunday
Value-Added Services24x7 Emergency Service for a 48" Expansion Joint
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Cold Shoe Testing Constant Testing
Marinite Slide Plate Testing
Spring Load Testing
Anchor Shoe Testing
Value-Added ServicesProduct Testing
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• > 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
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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
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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• Online Catalog: www.pipingtech.com/catalog
• Technical Webinars: www.pipingtech.com/webinar
• Blog: www.pipingtech.com/blog
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