Pipe Patching Flashcards
Different Types of Pipe Damage?
Simple Rupture
Compound Rupture (protruding edges)
Elbow Rupture
What are these 3 ruptures?
Simple Rupture
Compound Rupture (protruding edges)
Elbow Rupture
What are these 2 ruptures?
Compound Rupture (flange)
Severed Pipe
What type of patching is this?
Jubilee Patch
What are the benefits of Jubilee patching?
Quickest temporary patch
Holds 100+ psi
Fits 1 size pipe
Source need not be secured
NO Flammables - Spray
What type of patch is this?
Band-it Patch
Band-it Patch?
A.K.A. Metal Clamping Tool
Steel bands
Clamping tool
Steel buckles
OR USE VICE GRIPS/CHAIN
<250 Deg F, Pressure varies
What type of patch is this?
Band-it Patch
What type of patch is this?
Soft Patch
Soft Patch?
THE Primary Temp. Patch
Holds up to 150 psi
Isolate rupture if possible
What type of patch is this?
Soft Patch
What type of patch is this?
Soft Patch
EWARP?
Emergency Water Activated Repair Patch
Aka. Syntho-Glass
Not in NSTM 079 V2 R3
Not for Pot Water, Flammables
PPE = Glasses, Rubber Gloves
<150 psi <300deg F
20 sec soak time
30 min cure time
What type of patch is this?
EWARP
Application Procedure for EWARP?
- Secure System
- Clean and Roughen Area
- Don PPE, open pouch
- Soak in Warm Water (20 sec)
- Wrap Several Inches Beyond
- Sets (hardens) in -30min
What type of patch is this?
Clamp patch
Clamp Patch?
Temporary patch for low pressure piping systems
2 types:
Wooden Block (stockade)- <150 psi
Bolt-type Hangar Clamp-Forged Steel for HP Systems
How do you handle a severed pipe?
Low pressure systems can be plugged with wooden plugs wrapped in cloth.
Plugs have a tendency to back out and should be shored in place or a hole drilled in the pipe to allow pin to be driven in.
May be necessary to break the pipe at a flange and bolt on a blank.
Pipe Jumper Hose System (PJHS)?
Provides a means to make temporary emergency cold pipe repairs in minutes. Ideal to quickly repair hydraulic lines, chilled water lines, fuel lines, fire protection systems, the firemain and compressed air systems.
Features include:
1. Installs with simple hand tools.
2. Operates at pressures to 4,000 psi (275 bar).
3. Operates at temperatures from 0-200F
4. Allows pipe jumpering up to 40 feet.
5. Available in kitted stowage for easy accessibility.
6. Repairs standard pipe sizes from 1/4-inch to 2 1/2-inch IPS/NS.
7. Provides a cold repair solution; no welding required.
What type of system is this?
Pipe Jumper Hose System (PJHS)
How do you fix a hole?
Put something in it, or put something over it
What is this?
Wooden Plugs
Wooden Plugs?
Most simple method
Unpainted- absorbs & grips better
Wrap w/ Cotton prior to insertion
Fill gaps w/rags, small wedges, etc.
Mattress and Pillows?
Effective for large holes
Innerspring preferred
Shore in place
Mattresses or Pillows can be wrapped around plugs
What type of patch is this?
Box Patches
Box Patches?
Up to 18 inches square and 6 pinches deep
Used when jagged edges protrude inward
Open end has a gasket
Shore in place, may be welded in place after shoring
Bucket Patch?
Can be inserted bottom first like a metal plug or stuffed with rags and used like a box patch
Can be secured by shoring or by using a hook belt
Cracks?
Drill 1/4 inch holes at the extreme ends of cracks to prevent spreading.
Use Marlin, Oakum and Rags to Caulk cracks.
Wedges may spread cracks.
Plates may be welded over cracks
What type of patch is this?
Cloth Patch
Cofferdams?
Stops large holes. An additional bulkhead built around the damaged area.
Shoring?
Best way to temporarily support structure until more permanent measures are possible.
Objectives for shoring?
a. To reinforce straining bulkheads, doors and hatches against abnormal pressures
b. To support damaged and weakened structure and fittings.
Reasons for shoring?
Panting - The alternate bulging and contraction of plating (caused by uneven pressure or locked up stresses) resulting in metal fatigue and often accompanied by a groaning or pinging noise.
Buckling of deck beams or bulkhead stiffeners
Bulging of bukhead or deck plating
Fracture or splitting of plating, especially alongside stiffeners or where bulkheads or decks abut hull plating.
Principles of shoring?
Use shoring for support only; do not try to restore to original shape.
Support the structure properly by spreading pressure over a wide area with a good layout of strongbacks or a shole.
Observe shore length limitations
Use strong points for shoring anchor points
Avoid cross axial stress.
Types of shoring?
K type
I type
What are the EWARP sizes?
3”x11”
4”x16”
What is the cure time for EWARP?
30min
What is the PSI for Jubilee (soft patches)?
296psi
What is the final step for patches?
OPTEST
