Swivel Joints

Swivels

Swivel Joints

Introduction

Swivel Joints are used in the industry wherever a movable pipe-connection system between two equipment parts is needed. Avoiding one of the biggest causes of premature hose failure. Torque stress is the largest single cause of PTFE and Stainless steel convoluted hose failure.

The swivel joints are designed for slow rotary motions under the influence of high internal pressures and/or external stress such as traction and bending forces.

With an appropriate combination of swivel joints nearly all movements from the simple rotation or swivelling motion up to motional actions in space can be realized.

Hose Swivels - single ball bearing

Use of Hose Swivels 

The use of hose swivels avoids torsion of hose assemblies, i.e. in filling machines, and improves the handling and coupling of nozzles for refuelling of petroleum based products and chemicals. 

Applications 

• Hose assemblies 
• Filling machines 
• Handling of refuelling of equipment e.t.c. 

NOTE

Unsuitable for high bending moments. Heavy Duty Swivels should be used in these applications. 

Low maintenance
Each unit consist of two body halves. Stainless Steel balls and a single spring assisted O-ring seal.

Compact external dimensions

High flow rate / low pressure drop

Full range of sizes, materials, seals and connections

Minimal maintenance requirements

Safety
Swivel function - allows the hose to relax to it´s natural rest position whilst allowing freedom of movement without imparting torque stress at the point of connection - Torque stress is the largest single cause of Composite, PTFE and Stainless Steel convoluted hose failure.

Economical
Cost effective solution to prolong lifetime of hoselines. 

Mann Tek standard Hose Swivel 

Hose Swivels - single ball bearing

Combinations of sizes, connections and materials

Sizes

Connections

1) Any combinations of male and female threads is possible.

2) Se page14 for illustrations of different types of DIN-flanges.

Materials and Seals

Working Pressure: (10 bar) - 300 psi (20 bar)

Illustrations of combinations

We manufacture Swivels in different sizes, connections and materials on request!

Heavy Duty Swivels - double ball race

Use of Heavy Duty Swivel - double ball race

The swivel Heavy duty is designed especially for hose rails to load and unload products like Aliphatic and Aromatic hydrocarbons, Alcohols and Amines, Ether and Ester, Glycos and Water, Liquid Fertilizers, Acids and Lyes.

NOTE

Please ask us for your special application.

Applications

• Offshore hose reels ship-to-shore
• Oil platform loading rigs
• Marine and industrial loading arms
• Hoses for road and rail tanker
• Chemical and petrochemical liquids
 and liquefied gases.

Low maintenance
Each unit consist of two body halves. Stainless Steel balls and a single spring assisted O-ring seal.

Compact external dimensions

High flow rate / low pressure drop

Full range of sizes, materials, seals and connections

Minimal maintenance requirements

Safety
Swivel function - allows the hose to relax to it´s natural rest position whilst allowing freedom ofmovement without imparting torque stress at thepoint of connection - Torque stress is the largestsingle cause of Composite, PTFE and Stainless Steel convoluted hose failure.

Economical
Cost effective solution to prolong lifetime of hoselines.

Heavy duty Swivel in Stainless Steel

Heavy Duty Swivels - double ball race

Combinations of sizes, connections and materials

Sizes

Maten

Connections

1) Any combinations of male and female threads is possible. 

2) Se page 14 for illustrations of different types of DIN-flanges

Materials and Seals

Working Pressure: 150 psi (10 bar)-1800 psi (125 bar)

Illustrations of combinations

We manufacture Swivels in different sizes, connections and materials on request!

How to order Swivels

NOTE

For loading arm applications, contact our technical department

Connections (thread, flange etc.)

O-ring / Seals materials

Used for extra (last letter)

A = Flat Seal, PTFE (Teflon®)
B = Flat Seal PUR (Vulkollan®)
D = Flat Seal FPM (Viton®)
W = Double Ball Race

E.G. Code No: D10794401A=Hose Swivel, Single ball bearing
One side: 2" BSP (Female) Other side: 2" NPT (Male)
Material: Stainless Steel, Flat Seal PTFE (Teflon®)

E.G. Code No: D85614401W=Swivel, Double ball race
One side: 4" NPT (Male) Other side: Flange 3", ANSI (ASA) 150 psi
Material: Stainless Steel

Flange facing types according to EN 1092

Type A Flat face                                      Type B Raised face                              Type C Tongue                                     Type D Groove

Type E Spigot                                              Type F Recess                              Type G O-ring Spigot                              Type G O-ring Groove

Flange Measurement - 1/2

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

Flange translation EN 1092----- DIN

Flange Measurement - 2/2

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

Flange Connection

Mounting instruction

When installing Mann Tek equipment to new pipe work, tanks, etc. ensure the system is free from debris that may be transferred through the coupling. Where the hose or loading arm assembly is the primary static dissipation or earth route, the electrical continuity value of the assembly shall be checked to ensure regulatory compliance. Special attention should be paid to the balancing of loading arms. The weight of the coupling plus transfer media should be taken into account at the specification stage. It is usual for loading arm balance settings to account of weight variations due to differences in the full / empty cycle.

The loading arm should be set to balance in the condition present at the time of connection. For example, should the loading arm be empty at the time of connection then it should be balanced in the empty condition.

The Mann-Tek product can be installed directly in the product line and is ready for use after
removing the transport protection. The installation is recommended as follows:

a. Remove the packaging and the flange protection
b. Check the coupling for damages before mounting.
c. To prevent damages during mounting a suitable wrench should be used for the intended bolts and nuts.
d. Ensure that the product line is empty and all valves are close
 before you connect the coupling into the line.
e. Set in all bolts first and tighten them by hand. Then increase the tightening torque in 2 steps up to the
 recommended value in the following table. Proceed every time according to the sequence shown in g.
f. Tightening torque1) for bolts:

    4 Bolt Pattern                                                                                        8 Bolt Pattern                                                                                    12 Bolt Pattern

The start-up may take place only when the Mann-Tek product has been mounted as instructed and the necessary function tests and leak tests have been conducted by the approved authorities.

1) The torque forces recommended bases on a thread friction coefficient μ=0,14 and a standard flat seal
according to EN 1514-1

About NPT and BSP threads

NPT

Sealing NPT threads can be an exasperating experience if certain techniques are not followed. The following tips will help alleviate many common problems in thread sealing:

1. Always use some type of sealant (tape or paste) and apply sealant to male thread only. If using a hydraulic sealant, allow sufficient curing time before system is pressurized.  

2. When using tape sealant, wrap the threads in a clockwise motion starting at the first thread and, as layers are applied, work towards the imperfect (vanishing) thread. If the system that the connection being made to cannot tolerate foreign matter (i.e. air systems), leave the first thread exposed and apply the tape sealant as outlined above.

3. When using paste sealant, apply to threads with a brush, using the brush to work the sealant into the threads. Apply enough sealant to fill in all the threads all the way around.

4. When connecting one stainless steel part to another stainless steel part that will require future disassembly, use a thread sealant that is designed for stainless steel. This stainless steel thread sealant is also useful when connecting aluminium to aluminium that needs to be disconnected in the future. These two materials gall easily, and if the correct sealant is not used, it can be next to impossible to disassemble.

5. When connecting parts made of dissimilar metals (i.e. steel and aluminium), standard tape or paste sealant per forms satisfactor.

6. For sizes 2” and below, tape or paste performs satisfactory. When using thread tape, four wraps (covering all necessary threads) is usually sufficient.

7. For sizes 2½” and above, thread paste is recommended. If thread tape is used, eight wraps (covering all necessary threads) is usually sufficient. Apply more wraps if necessary.

8. For stubborn to seal threads, apply a normal coating of thread paste followed by a normal layer of thread tape. 

9. For extremely stubborn to seal threads, apply a normal coating of thread paste followed by a single layer of gauze bandage followed by a normal layer of thread tape.

10. Over-tightening threads can be just as detrimental as insufficient tightening. For sizes 2” and below, hand tighten the components and, with a wrench, tighten 3 full turns. For sizes 2½” and above, hand tighten the components and, with a wrench, tighten 2 full turns.

Caution!

When this procedure is done, the connection becomes permanent. Extreme measures will be necessary to disconnect these components. All other measures to seal the threads should be explored prior to use of this technique.

BSP

The threads are parallel with flat sealing surface. 

This allows to use the full thread length for screwed-on parts. The largest possible transfer of force is guaranteed for short length. The thread seal behind the relief groove of the thread cannot drop out.

Simple screwing down, makes a safe connection. Subsequent tightening during operation is possible at any time. Change of seal and new assembly do not require any expert knowledge.

The European standardisations for hose assemblies require parallel threads with flat seals, because of the advantages.

Flat Seals for thread

Flange Seals

Product No-    ON REQUEST

MATERIAL:

ELAPAC- FD is a three component mixture, made of RUBBER (NBR) vulcanised, for the adhesion and resistance to kinking. 

CORK for compressibility and sealing capability. When tightening the flange seal does not move towards the outer or inner edge of the sealing faces.The flange
seal does not ”settle,” and can be re-used in most cases.

FIBRES give the material the necessary rigidity and the stability to insert flange seals into narrow gaps from the side. The values for swelling are considerably
lower for fibre reinforced mixtures than for plain rubber seals.

Further advantages: No leaching out of softening agents. No shrinking or hardening through drying. No influence on or discoloration of media. No hardening at temperature range of -25 o up to +70o Celsius. No sticking on flange. Additional ”adhesives” are not necessary. – Therefore good reusability. A high adaptability, where flange seals should still have good flexibility to avoid pipe fractures or simple sealing materials because little or no force can be used to tighten the joint. Not suitable for use as thread seal, because the material is too soft and does not have enough lateral strength, this allows the medium to attack the seal material. Also not suitable for applications where the flange seal is only squashed on 2 mm to 3 mm of the total width. Care should be taken not to squash the material to much especially the 2 mm material, if in doubt please use the 3 mm material. 

GAS IMPERMEABILITY :

Due to the fibre content of ELAPAC; gas permeability is to be expected when using seals with narrow width – especially at high vacuum operation.

APPROVALS:

Approved as flange sealing material for all fuels and lubricants by the German military and the major oil companies for tank trucks, refineries and aircraft refuellers. Approved in 3 mm thickness by the German railway (Mat. No. 150.309). ELAPAC-FD meets the DIN 28 463.

RESISTANCE:

The details refer to fitted flange seals. Only the inner rim of the flange seal is in contact with the medium. In the event of a possible attack this would only result in low penetration and the use is still possible. If the flange seal is completely immerged in the medium during laboratory tests, swelling and loss of stability is of course higher. If the resistance of ELAPAC is not sufficient but good compressibility is required, we offer the special design ”TM” seal which is PTFE encapsulated. Application of foodstuffs: ELAPAC-FD is only suitable with PTFE-cover, otherwise mixture particles can influence the quality of the foodstuffs.
APPLICATION: As an elastic flange seal for tank truck and tank plant construction etc., where rough sealing surfaces require.

TECHNICAL DATA:

hardness, Shore                          A 86 ± 3

tensile strength                           longitudinal 10 N/mm2 lateral 4,5

elongation at break                    longitudinal 15 N/mm2 lateral

compressibility                           75 %

recovery                                      90 %

compression set 24h, 700 C      40 %

tear resistance                             longitudinal 7 N/mm2 lat

working pressure maximal        25 bar

colour                                           blue

marking                                        print

O-ring materials