Dresser Pipeline Repair Products

Dresser Pipeline Repair Products

Since introducing a few bolted pipe repair products (Dresser Coupling) over 100 years ago, Dresser has expanded it’s repair product line to include Dresser Clamps and weldable Dresser Sleeves for the water and industrial markets. For today’s pipeline integrity repairs Dresser now offers full-wrap weldable repair sleeves for mechanical coupling joints and stress crack anomalies. Using ordinary field welding procedures, Dresser weld-over sleeves offer both repair of broken or leaking joints while providing a permanent reinforcement that will last the life of the pipeline

Dresser Style 38, Style 40 Coupling - Video Overview

 

 

DRESSER® Life-time Gaskets

Dresser Compounded Rubber Gaskets

Pipe joints must be able to absorb pipe stress caused by natural forces and natural expansion, contraction, vibration and deflection while the line is in service. The sealing capabilities of Dresser Gasket and the extreme flexibility of a Dresser Coupling joint is made possible by the resilience of the rubber-compounded gaskets. Resiliency is the property that enables the Dresser gaskets to maintain pressure against the followers that confine it and, at the same time, allow for flexibility not found in rigid piping connections. Without it, a flexible joint is not possible!   Simply put, the absorption of pipeline stress permits each section of the pipeline to “float” in the joint ensuring a flexible piping system while avoiding leakage, line breaks, costly repairs and service interruptions.

Armored® Dresser Gaskets

Armored gaskets can be used to great advantage where low electrical-resistant joints are desired. The armor “bites” into the pipe providing metal to metal contact allowing easy passage of current where cathodic protection is a necessity.  The armor–an elastic, practically indestructible brass coil or helix–is molded into the gasket tip becoming an integral part of the gasket. When used with the proper grade/compound rubber, the armor shields the gasket material from the line content without interfering with the sealing efficiency of the gasket.

Buna N (Grade 42 - Nitrile) Max. Temp. 212°F*

Buna N (Grade 42) Dresser gaskets are resistant to oil, most aromatic and aliphatic hydrocarbons, natural gas fogging oil, condensates and gasolines.

Buna S (Grade 27) Max. Temp. 212°F*

The compound most generally used for plain gaskets is Buna S (Grade 27). This Dresser gasket has wide applications and is accepted as standard for most pipeline use. It is recommended for use on lines transporting both fresh water and salt water, natural and other gases, air, most acids, alkaline and sugar solutions and some refrigerants.

Fluorocarbon - Viton - Max. Temp. 350°F

Fluorocarbon gaskets (Dresser Viton Gaskets) are resistant to hydrocarbons, aromatic hydrocarbons, alcohols, organic acids, nitrogen-containing compounds, vegetable oils and greases.

Butyl -Max. Temp. 250°F

Butyl gaskets are resistant to hot air service, steam, hot water and miscellaneous aqueous solutions. They are also suitable for vegetable oils, organic chemicals, oxidizing acids and alkalies.

EPDM - Max. Temp. 300°F

EPDM gaskets provide excellent resistant to aging factors such as ozone, oxygen and elevated temperatures. This includes service in hot water, steam and dry heat. They are also suitable for handling popular chemicals such as ketones, alcohols, phosphate ester hydraulic fluids, glycols, dilute acids and alkalies.

High Temperature - Max. Temp. 1200°F

These braided flexible gaskets are designed specifically for the high temperature and abrasive atmospheres associated with services such as fly ash handling systems. As a replacement for asbestos, these gaskets are manufactured of a pure homogenous graphite bonded to a fiberglass carrier for strength and thermal durability. The braid over braid construction is die-formed and cut to length to fit proper coupling configurations resulting in a uniform tolerance which has proven itself as a reliable asbestos replacement.

Note: The non-resilient characteristic of this particular gasket material may result in a non-leak-proof seal. This should be taken into consideration for this application.

AL-CLAD™ Coating Offered as Standard   

Dresser AL-CLAD fusion-bonded epoxy coating is offered as standard on the most common Dresser pipe repair products in the most popular sizes featured in this catalog.*  Tough, corrosion-resistant, factory-applied Dresser AL-CLAD coating has been developed through years of exhaustive testing and field application.  AL-CLAD epoxy coating is a fusion-bonded coating applied under rigidly controlled factory conditions and offers smoother flow in wetted waterways while providing protection against corrosive or aggressive conditions.

*Excludes weldable repair sleeves where Dresser Red-D Shop-coat is standard. Please consult factory for other products and sizes where AL-CLAD coating may be optional.

Why are DRESSER® couplings used more than any other coupling?

Dresser offers the broadest line of couplings, including long body, insulating, reducing and transition types.

Products feature Dresser AL-CLAD™ coating as standard in the most popular sizes. Our epoxy coating offers optimum protection against highly corrosive soil or aggressive water conditions and for handling brine, brackish water, most acids, alkalies, oil, chemical particulates and gases.

Sizes range from 3/8” through 405” to cover every application including high temperature and abrasion.

Dresser couplings are fast and easy to install with any size pipe or tubing.

Wide temperature range from -20°F to +1200°F, with pressure ratings to 1500 psi.

Available in rugged welded steel construction, stainless or carbon steel, titanium, monel or other alloys for special applications.

Use a Dresser coupling and your pipeline joint is non-rigid, accepting expansion, contraction, vibration and line deflection.

Special elastomer formulations are provided custom-matched to specific fluid process or application requirements.

The Basic Working Principle of Dresser Coupling

The Dresser coupling consists of one cylindrical middle ring, two follower rings, two resilient gaskets of special Dresser compound, and a set of steel track-head bolts. The middle ring has a conical flare at each end to receive the wedge portion of the gaskets. The follower rings confine the outer ends of the gaskets. As the nuts are tightened, the bolts draw the follower rings toward each other, compressing the gaskets in the spaces formed by follower rings, middle ring flares and pipe surface thus producing a flexible, leak-proof seal on the pipe joint.

Product Line

Style 38, 38 Stainless & 138 Dresser Coupling

Style 39 Insulating Dresser Coupling

Style 40 Long-Body Dresser Coupling

Style 62 Reducing & Transition Dresser Coupling

Style 31 Line Caps

Style 167 Lock Couplings

Style 128-W Flange Adapter

Style 63 Expansion Joints

Style 131 Dismantling Joint

Style 440 Joint Harness

Style 253 Cast Coupling

Dresser pipeline products have a line of compression couplings for up to 2 inch nominal pipe size. Trupply, one of the largest dresser coupling distributor in US, offers Style 90, Style 65 & Style 88 coupling for convenient online shopping. Lear more about Dresser Compression Coupling.

Coupling Deflection, Movement, Expansion and Contraction

Laying out curves with standard Dresser couplings and straight sections of pipe

Presented in tabular form in the table at right entitled “Radius of Curve and Deflection of Pipe in Feet”, this chart indicates (1) radius of circle for any given degrees of deflection and pipe length, (2) length of pipe for any given radius and deflection or (3) degrees deflection necessary for any given pipe length and radius. This information is worked out for the more commonly used pipe lengths and degrees deflection.

Expansion & Contraction

Each coupling 10” ID and larger will safely accommodate up to 3/8” longitudinal pipe movement.

This is equivalent to the amount of movement resulting from a 120° temperature variation in a

40-foot length of steel pipe. If pipe is not buried, anchorage should be provided to prevent excessive accumulation of movement. For repeated movements such as on a bridge or above ground, or if expansion exceeds 3/8” per joint, a Dresser Style 63 expansion joint should be used. 

RADIUS OF CURVE AND DEFLECTION OF PIPE IN FEET

Length of Pipe Sec.

(feet)

Radius of Curve (Feet)

Varying degrees deflection in each coupling

Deflection of Pipe (Feet/Inches) Varying degrees deflection in each coupling

6

12 16

18 20

30 40

344

687 916

1031 1145

1718

2291

172

344 458

516 573 860

1146

115

229 306

344 382

573 764

84

172 229

258 286

430 573

66

138 183

206 229

344 458

57

114 153

172 191

286 382

1/4”

2-1/2 3-3/8

3-3/8 4-1/4

6-1/4 8-3/8

2-1/2”

5

6-3/4

7-1/2 8-3/8

1’ 5/8

1’ 4-3/4

3-3/4”

7-1/2

10

1’1-1/4

1’ 5/8

1’ 6-7/8

2’ 1

5”

10

1’ 1-1/2

1’ 3-1/8

1’ 4-3/4 2’ 1

2’ 9-1/2

6-1/4”

1’ 5/8

1’ 4-3/4

1’ 6-7/8 1’ 8-7/8

2’ 7-7/8 3’ 5-7/8

7-1/2”

1’ 3

1’ 8

1’10-1/2

2’ 1

3’ 1-5/8 4’ 2-1/8

 

 

Maximum Recommended Laying Deflection Dresser Style 38 Couplings

From 3/8” ID to 2” ID Inclusive ...................6° From 2” ID to 14” OD Inclusive ...................4°

With Middle Ring Lengths: 5” 7” 10”
14” OD - 20” OD Inclusive 2-1/2°
20” OD - 30” OD Inclusive
30” OD - 37” OD Inclusive 1-1/2° 3-1/2°
37” OD - 42” OD Inclusive   2-1/2° 3-1/2°
42” OD - 49” OD Inclusive   3° 
49” OD - 54” OD Inclusive  
54” OD - 66” OD Inclusive   2-1/2°
66” OD - 78” OD Inclusive    
78” OD - 90” OD Inclusive     1-1/2°
  

Pipeline Defects & Repair Product Applications

For Water & Industrial Cast Iron and Ductile Iron Pipe Repairs

Longitudinal or Circumferential Breaks (A, B);

Small Pinhole Leaks, Splits, or Corrosion Cracks (D) or Broken Welds (E)

PRODUCT

SIZE

80 Split Sleeve

3”–8”

126 Split Sleeve

3”-24”

360 Clamp

2”-30”

 

   

 

Leaking Coupled or Mechanical Joints

PRODUCT

SIZE

126 Split Sleeve

3”-24”

 

     

Leaking Bell & Spigot Joints and Broken or Cracked Bell Joints

PRODUCT

SIZE

LEAK:

 

60/160 Bell Clamp

3”–48”

60-S Bell Clamp

4”-36”

CRACKED:

 

126 Split Sleeve

3”-24”

 

  

Leaking or Cracked Stab-type Joints

PRODUCT

SIZE

LEAK:

 

60/160 Bell Clamp

3”–48”

60-S Bell Clamp

4”-24”

CRACKED:

 

126 Split Sleeve

3”-24”

 

For Water & Industrial Steel Pipe Repairs

Longitudinal or Circumferential Breaks (A, B);

Small Pinhole Leaks, Splits or Corrosion Cracks (D), or Broken Welds (E)

PRODUCT

SIZE

93 Split Sleeve

6”-24”

96 Split Sleeve

6”-30”

97 Split Sleeve

3”-16”

110 Weld Sleeve

4”-30”

220 Weld Sleeve

2”-26”

77B Band Clamp

2”-24”

118 Clamp*

½”-8”

360 Clamp

2”-30”

 

   

*Style 118 Clamps are for longitudinal repairs and do not provide 360-degree seal on the pipe

Leaking Threaded Joints or Leaking Mechanical Joints 

PRODUCT

SIZE

4 Collar Clamp

¾”-4”

41 Collar Clamp

6”-12”

93 Split Sleeve

6”-24”

96 Split Sleeve

6”-30”

220 Weld Sleeve

6”-26”

 

  

For PVC Pipe Repairs 

PRODUCT

SIZE

LEAK:

 

4 Collar Clamp

¾”-4”

41 Collar Clamp

6”-12”

BROKEN or CRACKED:

 

360 Band Clamp

2”-24”

 

 *Video Transcript

These are your style 38 Dresser couplings. Pretty simple, bolts, a couple of end plates called followers, two gaskets, and a middle ring or sleeve in the middle. Every Dresser coupling comes with instructions on how to use them and how to install them. Follow the instructions, you won’t have any problem. This is what’s called a light pattern coupling, it only has a 4 inch middle ring, a lighter weight construction, lighter weight bolts, much easier to handle, only about up to 150 pounds of pressure. If you have more than that, don’t use the light pattern. Go to one of the heavier regular pattern style 38 Dresser couplings or the style 40, just a longer version of the style 38, otherwise, it’s the same thing. They have this grey epoxy coating, good corrosion resistant epoxy coating, good for most conditions. They can come with different gaskets. the standard gasket in a Dresser coupling is a BUNA S, or as Dresser calls it, a plain grade 27 gasket, that’s a water service gasket. They have a BUNA N, which Dresser calls a grade 42, that’s good for oil service. You can get both gaskets in an armored gasket with a small brass coil embedded into the tip of it. This allows metal to metal contact all the way through, if that’s needed, it also helps protect the rubber. They have higher temp gaskets, EPDM, Butyl, Viton, they even go so high as to have a graphite impregnated carded cloth woven gasket for high temp, up to 1200°F in low pressure applications.

There are a couple of Dresser couplings with the pipe already put together, this is basically what it will look like once everything is put together. The big thing you need to remember, follow the instructions. They come on every single Dresser coupling that is sold. All you need is a little soapy water to clean off the ends of the pipe, make sure they’re clean of any dirt and scale and help lubricate the gasket as you put them on, and a torque wrench. Use a torque wrench. They have recommended torques on the instructions. You can over tighten it, you can under tighten it. Just tightening the thing until the leak stops doesn’t mean it’s ready, go to the right pressure on the torque wrench. Use the torque wrench and follow the instructions, you shouldn’t have any problems.