Dry Gas Couplings

Mann-Tek Dry Gas Coupling for safe handling of LPG - in liquid or vapor phases

The Dry Gas Coupling has been developed for a safe and quick connection and disconnection of hoses and loading arms to tank trucks, rail tankers and tank containers. During connection and after disconnection there is no spillage. 

This increases safety in the loading process of hazardous fluids

Suitable for handling a range of LPG applications - Propane and Butane but alsofor other applications with similar requirements the Dry Gas Coupling is useful. The robust design, easy servicing and high level of security assures safe and frequent use on a long term basis. This protects the environment and the media handled, reduces the risk of accidents and saves money.

A modular design with several optional features makes it possible to find individual solutions for your special application.

How the Mann Tek Dry Gas Coupling works

Why use the Mann Tek Dry Gas Coupling?

• Spillfree handling for loading and unloading tank
  trucks, rail tankers and tank containers.
• Minimization spillage and product loss keeps the
  environment free from Hazardous Vapors and
  Liquids.
• “Easy to Use” – design saves time and minimises health risks.
• Reliability and easy servicing saves your investment.
• Approved for safe handling of LPG - Propane
  (CAS 74-98-6, UN 1978) and Butane (CAS 106-
  97-8, UN1011). UN-classification 2.1 and similar
  applications.
• 3” and 4” is compatible with existing Dry Disconnect / Dry Break Couplings according to
  STANAG 3756
• The 1” is a heavy duty vehicle filling nozzle
  according to EN 13760.
• Approvals according to the European Directives PED and ATEX and the international
  requirements ADR, RID, IMDG and TDT.

Dry Gas Coupling - 1" Hose unit/coupler

1 " Hose unit / Coupler (socket Ø56 mm / Ø2.20 inch) With female 3/4" - 1" - 1 1/4" inlet.

Available with ACME threads for assembling direct on existing connections.

Other handle and material on request.

1 " Hose unit / Coupler (socket Ø56 mm / Ø2.20 inch) With flanged 3/4" - 1" - 1 1/4" inlet. 

Other handle and material on request.

Dry Gas Coupling - 2" Hose unit/coupler

2" Hose unit / Coupler (socket Ø71 mm / Ø2.80 inch) With female 1 1/2" - 2" inlet

Available with ACME threads for assembling direct on existing connections. 

Other handle and material on request.

2" Hose unit / Coupler (socket Ø71 mm / Ø2.80 inch) With flanged 1 1/2" - 2" inlet.

Other handle, flange and material on request.

Dry Gas Coupling - 3" Hose unit/coupler

3" Hose unit / Coupler (socket Ø119 mm / Ø4.68 inch) With female 2 1/2" and 3" inlet.

Other handle and material on request.

Available with ACME and Witworth threads (ie. W90) for assembling direct on existing connections.

3" Hose unit / Coupler with (socket Ø119 mm / Ø4.68 inch) With flanged 2 1/2" and 3" inlet.

Other handle, flange and material on request.

Dry Gas Coupling - 4" Hose unit/coupler

4" Hose unit / Coupler (socket Ø164 mm / Ø6.46 inch) With female 4" inlet.

Other handle and material on request.

4" Hose unit / Coupler (socket Ø164 mm / Ø6.46 inch) With flanged 4" inlet.

Other handle and material on request.

Dry Gas Coupling - 6" Hose unit/coupler

6" Hose unit / Coupler (socket Ø238mm / Ø9.25 inch) With female 6" inlet.

Other handle and material on request.

6" Hose unit / Coupler (socket Ø238 mm / Ø9.25 inch) With flanged 6" inlet.

Other handle and material on request.

Dry Gas Coupling - 8" Hose unit/coupler

8" Hose unit / Coupler (socket Ø272 mm / Ø10.7 inch) With flanged 8" inlet.

Other handle and material on request.

Dry Gas Coupling - 1" Tank unit/adapter

1" Tank unit / Adapter (socket Ø56 mm / Ø2.20 inch) With female 3/4" - 1" - 1 1/4" inlet.

Other material on request.

Available with ACME for assembling direct on existing connections.

1" Tank unit / Adapter (socket Ø56 mm / Ø2.20 inch) With flanged 3/4" - 1" - 1 1/4" inlet.

Other flange and material on request.

Dry Gas Coupling - 2" Tank unit/adapter

2" Tank unit / Adapter (socket Ø71 mm / Ø 2.80 inch) With female 1 1/2" - 2" inlet. 

Other material on request.

Available with ACME for assembling direct on existing connections.

2" Tank unit / Adapter (socket Ø71 mm / Ø 2.80 inch) With flanged 1 1/2" - 2" inlet.

Other flange and material on request.

Dry Gas Coupling - 3" Tank unit/adapter

3" Tank unit / Adapter (socket Ø119 mm / Ø4.68 inch) With female 3" inlet. 

Other material on request.

Available with ACME and Witworth threads (ie. W90) for assembling direct on existing connections.

3" Tank unit / Adapter (socket Ø119 mm / Ø4.68 inch) With flanged 2 1/2" or 3" inlet.

Other flange and material on request.

Dry Gas Coupling - 4" Tank unit/adapter

4" Tank unit / Adapter (socket Ø164 mm / Ø6.46 inch) With female 4" inlet.

Other material on request.

4" Tank unit / Adapter (socket Ø164 mm / Ø6.46 inch) With flanged 4" inlet.

Other flange and material on request.

Dry Gas Coupling - 6" Tank unit/adapter

6" Tank unit / Adapter (socket Ø238mm / Ø9.25inch) With female 6" inlet.

Other material on request.

6" Tank unit / Adapter (socket Ø238 mm / Ø9.25 inch) With flanged 6" inlet.

Other flange and material on request.

Dry Gas Coupling - 8" Tank unit/adapter

8" Tank unit / Adapter (socket Ø272 mm / Ø10.7 inch) With flanged 8" inlet.

Other flange and material on request.

Dry Gas Coupling - Caps and Plugs

Dust Cap for Tank unit / Adapter

Dust protection in rubber

A Dust Cap gives very good protection against corrosion, and withstands both hot and cold environments.  

Dust Cap for increased safety

It´s only possible to remove the cap from the Tank unit /Adapter after pulling the securing stift and at the same time twisting the cap. The Dust Cap is manually lockable with padlock.

Standard Caps in Composite. It covers the widest range of chemical and petroleum products.

Pressure Cap - Working Pressure PN 25 bar / 363 psi

3rd closure (valve) on Rail tankers, Containers and Tank trucks

The pressure caps are allowed by ADR/RID regulations as 3rd closure on Rail tankers, Containers and
Tank trucks. Meaning that the Pressure Cap can be used instead of the traditional Ball Valves.

The Mann Tek Pressure Cap for Tank units / Adapters is designed to maximize operator safety and containment safety.

Features

• Pressure indicator
• Depressurization
• Customs / tamper seal feature
• Automatic locking
• Manually lockable (with padlock)

Dust Plug for Hose unit / Coupler

Use the Mann Tek Dust Plug to prevent ingress of dirt and water in the couplings. The material in the Dust Plug is composite. 

Other material on request.

Dry Gas Couplings - pressure

Connection / disconnection under pressure - maximum pressure

Use Pressure relief valve for Tank unit when higher pressure difference or trapped liquid.

Pressure equalizing valve for Tank units

This system dissipates trapped fluid pressure into hose coupler without spillage, to allow easy connection. 

Dry Gas Couplings - pressure

Illustration Pressure Drop Measurement

According to NATO STANAG 3756, Annex E 

Flow diagram Pressure Drop Curve:

Dry Gas Couplings - Options

DGCoupling Hose unit with "stop before disconnect"

The Hose unit with "stop before disconnect" is a feature for detecting leakage in the Tank unit.

After stop and control for leakage the user must manually unlock the hose coupling before disconnection.

DGCouplings with ACME and Witworth threads

DGCouplings Tank units and Hose units are available with ACME and Witworth threads for assembling direct on excisting connections.

Open threaded ACME couplings has been used for a long time on the rail tank resulting in high product losses, environmental effects and health risks.

Non projecting piston spindle 

Tank units with no parts protruding from the coupling in connected position.

For mounting directly on ball-valves, etc.
On request!

Option - Hose unit with Break-away integrated

Where there is a risk of excessive force on the hose due to unexpected movement between the loading and unloading station, combining the Dry Gas Coupling with a Safety Break Away coupling.

On request!

Dry Gas Couplings - Technical Data and Spillage

Technical Data

Size:   1” (Ø56 mm), 2” (Ø71 mm), 3” (Ø119 mm) , 4” (Ø164 mm)  6" (Ø238 mm) and 8" (Ø272 m)

Materials:   Gunmetal / Brass and Stainless Steel 316L, SS-EN 10 272-1.4

Seal:   Standard material: FPM (Viton) or NBR (Nitrile) according to EN549 B2

On request: EPDM, Kalrez, NBR Low temp, Perfluorelastomer (FFPM), Fluorsilicone rubber (MFQ), Chemraz and Viton GF.

Temperature range:   -20ºC (-4ºF ) to 80ºC (176ºF) (larger temperature range from -50ºC (-58ºF ) up to +200ºC (392 ºF ) is possible, depending on Seal material)

Max Working Pressure:   MWP 25 bar / MAWP 300 psi

Min. Burst Pressure:   125 bar / 1813 psi 

Safety Factor:   5:1

End Connections:   BSP- , NPT-, ACME- and Witworth threads, DIN- and ASAflanges. Other connections on request.

Spillage diagram:

Comparasion of liquid loss during disconnection for Dry Gas Couplings and traditional systems using open threaded couplings, or flange to flange connections. The diagram shows that liquid loss for traditional systems may be as much as 10.000 times more than when using Dry Gas Couplings.

Dry Gas Couplings - Flange Measurement

Flange Measurement - 1/2

Ø D = Diameter
Ø k = Centre diameter
n = Numer of holes
Ø d = Hole diameter

Dry Gas Couplings - Flange Measurement

Flange Measurement - 2/2

Ø D = Diameter
Ø k = Centre diameter
n = Numer of holes
Ø d = Hole diameter