Dielectric Insulated Unions

Hart Dielectric Insulated Union

Fail Safe Leakproof Reliability

At any pressure, HART O-Rings actually strengthen the seal rather than loosen it.

STANDARD O-RINGS
VViton® Florocarbon A (FKM-A)
EEthylene Propylene (EPDM)
TTeflon® Tetrafluoroethylene (FEP)
BNitrile / Buna N (NBR))
SPECIALTY O-RINGS / SEALS
NNeoprene® Polycloroprene (CR)
KKalrez® Perfluoroelastomer (FFKM)
HNHydrogenated Nitrile (HNBR)
EPNSF Approved EPDM (Ethylene Propylene)
GMetalic Graphite Spiral Wound Seal
SHigh-Temp Steam (up to 550*F max) EPDM
INo O-Ring (Integral Seat "Bail to Cone")
Teflon®, Viton®, Kalrez® are
Registered Trademarks from DuPont

Static

The O-ring is fitted into a machined groove between the two halves of the union. When the halves are drawn together the O-ring compresses to an ovalized cross-section, forming a positive, resilient seal which serves to block the fluid, thus sealing even at low or no pressure.


Under Load

As pressure is increased the O-ring is forced to flow and is "squeezed " into the downstream side causing the O-ring to conform to the shape of the end, blocking the groove gap. The more the system pressure increases, the more effective the seal.


Stright-Away Breakout

The flat faced construction allows for slipping the component in and out without disturbing the surrounding tube or pipe sections. Pipe alignment is much easier with Hart Unions since it is unnecessary yo spring the line during make-up or disassembly.

Specialty Orders

Specialty O-Rings also available. Inquire within.

Ordering

The charts below contain all the information necessary to place an order. Use the appropriate codes in the manner shown below. Example: a Class 3000 Female Threaded 1" Union with Viton O-ring and 316 Stainless Steel Ends is coded as follows:


When a size reduction or change in material is needed, simply enter the Tailpiece code and then the Threadpiece code separated by a slash as shown below. A Dielectric Class 3000 Union with a Dielectric Coated A105 Carbon Steel Tailpiece that is 3/4" Female NPT, with a 304 Stainless 1/2" Male NPT Threadpiece, Teflon O-Ring, is coded as follows:


To order, call 800-769-0503

DESCRIPTION TAIL THREAD PIECE SIZE O-RING
FNPT 3,000 lb, Pipe 31 31 0  (1/8")
1  (1/4")
2  (3/8")
3  (1/2")
4  (3/4")
5  (1")
6  (1 1/4")
7  (1 1/2")
8  (2")
9  (2 1/2")
10 (3")
11 (3 1/2")
12 (4")

STANDARD O-RINGS
V Viton® Florocarbon A (FKM-A)
E E Ethylene Propylene (EPDM)
T T Teflon® Tetrafluroethylene (FEP)
   
SPECIALTY O-RINGS / SEALS
N Neoprene® Polychloroprene (CR)
K Kalrez® Perfluogenated Nitrile (HNBR)
HN Hydrogenated Nitrile (HNBR)
EP NSF Approved EPDM (Ethylene Propylene)
G Metalic Graphite Spiral Wound Seal
I No O-Ring (Inegral Seat "Bail to Cone")
   
Teflon®, Viton®, Kalrex® are
Registered Trademarks from DuPont
   
MNPT 3,000 lb, Pipe 32 32
SW 3,000 lb, Pipe 33 33
SW 3,000 lb, Pipe 34 34
BW 3,000 lb, Pipe 35 35
Sweat Copper Tube 36 36
FNPT 6,000 lb. Pipe 61 61
MNPT 6,000 lb, Pipe 62 62
SW 6,000 lb, Pipe 63 63
SW 6,000 lb, Pipe< 64 64
BW 6,000 lb, Pipe 65 65
     
MATERIAL OPTIONS
A Aluminum
B Brass 464 or 360
CS A105 Carbon Steel
304 A182F304 Stainless
304L A182F304L (low carbon) Stainless
316 316 A182F316 Stainless
316L A182F316L (low carbon) Stainless
A20 Allloy 20 (formally known as carpenter steel C20)
73 70/30 Copper Nickel
91 90/10 Copper Nickel
H Hastalloy
I Inconel
M Monel 400
T Titanium

 

O Orifice
D Dielectric (Insulating)
H Hammer Lug

 

Call to Order: 800-769-0503

Dielectric (Insulated) Series

Class 3000 and 6000 Unions


HART Industrial Dielectric O-Ring Unions are engineered to provide the most effective and efficient method of preventing electrolytic deterioration. The union design provides insulation against galvanic corrosion and also breaks current flow eliminating any stray corrosion. The thermo-baked epoxy polymer coating provides >600 volts/mil dielectric resistance.

Unions can be provided with any connection type on the threadpiece side (welded, sweat, threaded, etc) and can be made to transition between different piping sizes!

HART Industrial O-Ring Unions are engineered to provide Class 3000 and 6000 Service and are the most popular union in the industry for general purpose applications. The flat face design provides turbulence-free fit across seats. This design is ideal where piping requirements dictate the necessity of having a flat face seal to make and break the pipe line. All HART Unions are made in the USA!

Standard O-Ring Union Features:

  • Turbulence Free: All unions provide a turbulence-free fit across the seats
  • O-Ring Isolation: The O-Ring seal is strategically located in the thread piece face reducing O-Ring media contact and added protection against abrasives and erosion.
  • Precision Machined components: All unions are precision machined to provide high quality and fail-safe leak proof reliability.
  • Interchangeable End Connections: Threaded, socket weld, and butt-weld ends are interchangeable. This feature reduces overall costs by eliminating unnecessary nipples, bushings, couplings and inserts.
  • Material Versatility: Unions can be provided in all standard metals or combination of metals. This includes 304 Stainless, 316 Stainless, A 105 Carbon Steel, Brass, Monel 400, Hastalloy, and Titanium.
  • Excellent vibration resistance: Seals will not loosen, even under extreme pressure and pressure surges.

3D Animations

Specifications

Hart Industrial Dielectric O-ring Unions are engineered to provide the most effective and efficient method of preventing electrolytic deterioration. The union design provides insulation against galvanic corrosion and also breaks current flow eliminating any stray corrosion. The thermo-baked epoxy polymer coating provides >500 volts/mil dielectric resistance.

Standard O-Ring Union Features:

• Turbulence Free: All unions provide a turbulence-free fit across the seats
• O-Ring Isolation: The O-Ring seal is strategically located in the thread piece face eliminating O-Ring media contact and added protection against abrasives and erosion.
• Precision Machined components: All unions are precision machined to provide high quality and fail-safe leak proof reliability.
• Interchangeable End Connections: Threaded, socket weld, and butt-weld ends are interchangeable. This feature reduces overall costs by eliminating unnecessary nipples, bushings, couplings and inserts.
• Material Versatility: Unions can be provided in all standard metals or combination of metals.
• Excellent vibration resistance: Seals will not loosen, even under extreme pressure and pressure surges.
• No maintenance: Once initial seal is made, no further tightening required

HART Dielectric Polymer Composite Coating

Hart Industrial Dielectric O-ring Unions are engineered to provide the most effective and efficient method of preventing electrolytic deterioration. The union design provides insulation against galvanic corrosion and also breaks current flow eliminating any stray corrosion. The thermo-baked polymer coating provides >600 volts/mil dielectric resistance.

Coating Features (ASSE Standard #1079-2005):

• Excellent resistance to wear, abrasion, and shipping
• Provides resistance to rust/corrosion per ASTM B-117 Salt Fog Tests.
• Operating temperatures from -425F to 255C
• Excellent resistance to ultraviolet light
• Superior adhesion to a variety of substrates including Steel, Brass, Copper, Stainless Steel, Monel, and Titanium.

Fluid/Solvent Resistance (ASTM D1308-79):

• HCI (pH2) Hydrochloric Acid (room temp) No Effect
• NaOH (50%) Sodium Hydroxide (room temp) No Effect
• MEK Methyl Ethyl Ketone at room temp No Effect
• Salt Spray (ASTM B-117)
• >500 hours- No Blistering
• Castrol Hydraulic Fluid at 200F Gloss decrease, no loss of coating integrity
• Ethylene Glycol at room temperature No Effect

Physical Properties:

• Typical Coating Thickness: 3-6 MIL
• Pencil Hardness: H (ASTM B3363)
• Breakdown Voltage: >20000 volts at 650μm (ASTM D149)
• Volume Resistivity : 1.26 x 1016 ohm-cm (ASTM D257)
• Gloss Finish: High