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corrosive environments

TUBEPRESS® has excellent resistance to a broad range of chemicals and or industrial mixtures / media. O-rings are available in a range of materials, user should verify compatibility of components with their application.

TUBEPRESS® stainless steel pipelines generally do not require any additional corrosion protection, except in atmospheres which contain chloride or chlorine. Please consult our Technical Department if TUBEPRESS® is to be used for diverse media such as industrial applications, swimming pools or for reticulating sea water.

When planning and installing TUBEPRESS®, high concentrations of chloride, which could work on the system externally, and/or internal evaporation need to be avoided as a matter of principle. In some applications the tubes should be protected by suitable coatings or jacketing. Extensive compatibility charts are available. Resistance to specific chemicals should be checked with Technical Department.

underground systems

Underground pipework should be protected against possible external substances causing corrosion or damage to O-rings. Please refer to Technical Department.

explosive or ignitable atmosphere

You, the user/customer/purchaser is responsible to identify any potential hazardous areas and to take necessary measures or precautions for complete safety. Information on protective measures is available with advice on your specific application.

dissimilar metals

TUBEPRESS® may be connected to copper or galvanized steel provided a minimum separation distance of the pipe diameter, in brass or bronze, is maintained. Valves and fittings in brass or bronze may be used.

dissimilar metals

Permissable connection between stainless steel and copper or galvanised steel.

CUTTING

TUBEPRESS® tubes are best cut with tube cutters or a fine-toothed planetary metal saw – whereby it is essential to ensure that the blade was not used previously to cut unalloyed steel. If electrically powered saws are used, the cutting speed must be limited so that temper colours are not created at the point of cutting in order to prevent the material becoming sensitised.

CAUTION !
The utilisation of cutting disks (flexible) or flame cutter is not permissible for the cutting of stainless steel tubes.

If annealing colours should arise, these must be eliminated on the inside and outside surface of the stainless steel tubes. Experience indicates that even a strawyellow discoloration of the stainless steel can lead to a sensitisation of the material. Particularly suitable for the cutting of tubes of stainless steel or copper is the saw RA 21 + GF+, with which the outside cut edges are also deburred simultaneously with the cutting. Tube ends must be de-burred inside and outside.

BENDING

TUBEPRESS® 15 mm to 28 mm can be bent cold with suitable bending tools. A bending radius of at least r = 3.5 x d is to be maintained. After bending, a sufficiently long tube section is required to fit connections. With larger than above specified dimensions, the manufacturer of the bending tools is responsible for a perfect bending result.

HOT BENDING OF TUBEPRESS® IS NOT PERMITTED.

thread sealants

The use of permanent elastic thread sealant is recommended.  No sealants containing chloride are to be used.

storage and transport

Ensure that tube and fittings do not come into contact with mild/carbon steel as damage to TUBEPRESS®’s inherent passive layer will result. A physical separation must be maintained between TUBEPRESS® and metal strapping, racking, truck trays, trolleys, workbenches, etc.

THERMAL EXPANSION

length expansion and contraction

Tubes carrying hot media expand differently depending on the temperature difference and/or fluxations. The installation must allow for sufficient expansion movement. Generally this movement can be absorbed on changes of direction, elbows etc but on longer lengths the following recommendations should be adhered to.

Tubepress® THERMAL EXPANSION FORMULA

Tubrepress formula_1 Tubrepress formula_2 = Thermal Expansion (mm)
Tubrepress formula_3 = 16.5 Coefficient of Expansion (20°C to 100°C
Tubrepress formula_4 = Pipe Length (M)
Tubrepress formula_5 = Temperature Variation (C° or K)

EXAMPLE

A tube for heated drinking water is 8 m in length and has an operating temperature of tW = 60°C and a cold water
temperature of tK = 10°C. The change in length ∆l as a result of thermal expansion needs to be determined.

Temperature  difference ∆t = tW – tK = 60°C – 10°C =50 K. The formula shows the change in length to be ∆ to allow for this thermal movement please refer to the following information.

LENTH X in M

EXPANSION ALLOWANCE IN MM*
OUTER TUBE
DIAMETER MM
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
15 0.40 0.57 0.69 0.80 0.90 0.98 1.06 1.13 1.20 1.27 1.33 1.39 1.45 1.50 1.55
22 0.49 0.69 0.84 0.97 1.09 1.19 1.28 1.37 1.46 1.54 1.61 1.68 1.75 1.82 1.88
28 0.55 0.77 0.95 1.10 1.22 1.34 1.45 1.55 1.64 1.73 1.82 1.90 1.97 2.05 2.12
35 0.61 0.87 1.06 1.22 1.37 1.50 1.62 1.73 1.84 1.94 2.03 2.12 2.21 2.29 2.37
42 0.67 0.95 1.16 1.34 1.50 1.64 1.77 1.90 2.01 2.12 2.22 2.32 2.42 2.51 2.60
54 0.76 1.08 1.32 1.52 1.70 1.86 2.01 2.15 2.28 2.41 2.52 2.63 2.74 2.85 2.95
76.1 0.90 1.26 1.56 1.81 2.02 2.21 2.39 2.55 2.71 2.86 2.99 3.13 3.26 3.38 3.50
108 1.08 1.52 1.86 2.15 2.41 2.63 2.85 3.04 3.23 3.40 3.57 3.73 3.88 4.02 4.17
* As calculated from Thermal expansion Formula
Tubepress Spacing Chart
Minimum spacing X to allow for thermal expansion (see chart – Length X in m)

LENGTH L IN M

EXPANSION ALLOWANCE IN MM*
OUTER TUBE
DIAMETER MM
5 10 15 20 25 30 35 40 45 50 55 60 70 80 90
15  0.23 0.33  0.40  0.46 0.52 0.57  0.61 0.65 0.69 0.73 0.77 0.80 0.87 0.93 0.98
22  0.28  0.40  0.49  0.56  0.63  0.69  0.74  0.79  0.84  0.89  0.93  0.97  1.05  1.12  1.19
28  0.32  0.45  0.55  0.63  0.71  0.77  0.84  0.89  0.95  1.00  1.05  1.10  1.18  1.26  1.34
35  0.35  0.50  0.61  0.71  0.79  0.87  0.94  1.00  1.06  1.12  1.17  1.22  1.32  1.41  1.50
42  0.39  0.55  0.67  0.77  0.87  0.95  1.02  1.10  1.16  1.22  1.28  1.34  1.45  1.55  1.64
54  0.44  0.62  0.76  0.88  0.98  1.08  1.16  1.24  1.32  1.39  1.46  1.52  1.64  1.76  1.86
76.1  0.52  0.74  0.90  1.04  1.17  1.28  1.38  1.47  1.56  1.65  1.73  1.81  1.95  2.09  2.21
108  0.63  0.88  1.08  1.24  1.39  1.52  1.64  1.76  1.86  1.96  2.06  2.15  2.32  2.48  2.63
* As calculated from Thermal expansion Formula
Tubepress u pipe Comp Tubepress length Comp
U-pipe compensator  (see chart – Length L in m) Length compensators are available as pictured if required.

SUPPORT SPACING

DIAMETER IN MM 15 22 28 35 42 54 76.1 108
SUPPORT SPACING IN MM 1.20 1.80 2.00 2.40 2.40 2.70 3.00 3.00
Clips are always to be attached on the tube only, not on the fittings. Allowance is to be made for thermal expansion and contraction.
Tubepress image

SPACE REQUIREMENTS

Tubepress Min Spaceing_1 Tubepress Min Spaceing_2
Minimum spacing between two press points
(see following chart)
Minimum spacing to wall
(see following chart)

MINIMUM SPACE REQUIREMENT BETWEEN PRESS

 TUBE OUTSIDE
DIAMETER IN MM
 NORMAL SIZE
DN
INSERTION
DEPTH IN MM
E
MINIMUM SPACE IN MM
A MIN L MIN B MIN C MIN
15 15 25 10 60 60 85
22 20 28 10 66 60 88
28
25 29 10 68 60 89
35
32 30 10 70 60 90
42
40 39 20 98 60 99
54
50 44 20 108 60 104
76.1
80 50 30 130 60 110
108
100 69 30 168 60 129