Steam Hose

Alfagomma Steam Hose & Fitting Solutions

ALFAGOMMA offers a wide range of high quality, safe and reliable steam hose and
different solutions of fittings and hose assemblies to match market requirements.

Hose

  • Low and high pressure saturated steam range - max WP 6/18 bar
  • Conductive tube - electrical resistance ≤ 106 Ohm/length
  • ISO 6134 compliant products class A and B (oil resistant cover)
  • Extra safe construction - 18 bar hose
    • EPDM or chlorobutyl extruded tube suitable for both saturated and superheated steam up to 232 °C
    • One or two high tensile steel wire braids
    • Black cover hose electrically conductive and suitable to be used in potentially explosive environments
    • Electrical resistance along the conductive layers ≤ 106 Ω/length
    • Electrical resistance through the hose wall ≤ 109 Ω

FITTINGS

  • Clamped solution
  • Crimped solution
steam-hose-suppliers
steam-hose-fittings

340AA

steam-hose-fittings

Steam 18 bar (270 psi) - Steel braided

Tube: black conductive EPDM.
Reinforcement: one or two high tensile steel wire braids.
Cover: black conductive EPDM – heat, abrasion and ozone resistant – pin pricked.
Application: saturated and superheated steam.
Constant operation: -40 °C +210 °C (-40 °F +410 °F) intermittent to 232 °C (450 °F)

340AH

Steam 18 bar (270 psi) - Steel braided

Tube: black conductive EPDM.
Reinforcement: one or two high tensile steel wire braids.
Cover: red EPDM – heat, abrasion and ozone resistant – pin pricked.
Application: saturated and superheated steam.
Constant operation: -40 °C +210 °C (-40 °F +410 °F) intermittent to 232 °C (450 °F)
340AH

Steam Hose Safety Guide

Handling steam is a very hazardous situation. Using care and some safety precaution can minimise or eliminate personal or property damage. (Reprinted from RMA IP-11-1 Steam Hose)

Selecting and Using Steam Hose

  • Make sure steam hose is identified as a steam hose. It should be branded as such, stating working pressure and temperature rating
  • Make sure working pressure and temperature is not exceeded
  • Do not allow hose to remain under pressure when not in use
  • Avoid excess bending or flexing of hose near the coupling. Straight line operation is preferred. If bends are necessary as part of operation, spring guards may help
  • Be sure and use recommended steam hose couplings and clamps on hose.

Maintenance Of Steam Hose

  • Periodic inspection of hose should include looking for cover blisters and lumps
  • Check for kinked areas that could damage hose
  • Drain hose after each use to avoid tube damage before hose is put back in operation, to avoid “popcorning” of the tube
  • Check tightness of clamps bolts after each use
  • Check to see if clamps halves are touching. If they are, recouple hose with smaller clamps to insure proper tightness or grip around hose
  • Do not store hose over hooks
  • Steam hose lying on metal racks or installed around steel piping will dry out the hose, causing tube and cover cracking.

Corrosive Steam

When the water used to generate steam contains dissolved air, oxygen or carbon dioxide, then these gases end up as contaminants in the steam. At high temperatures of steam both oxygen and carbon dioxide are extremely corrosive. Carbon dioxide is acidic and therefore attacks metals whereas the oxygen corrodes metals and oxidises rubbers. Corrosion of metals in the presence of both oxygen and acids is forty times faster than with either alone. Boiler water is therefore normally treated not only to remove the “hardness” which would cause “furring” of the boiler but also to remove dissolved oxygen and carbon dioxide and to ensure that the steam is not only not acidic but even slightly alkaline. Boiler water treatment is a specialised subject beyond the scope of this technical sheet but correct steam generation is important.

Deterioration Of Steam Hose

Like all rubber products steam hoses have a finite life and are subject to gradual deterioration with use. However, it sometimes happens that hoses which have been giving a good life suddenly start failing without apparent reason. In such cases it is often a change in the steam conditions causing a rapid acceleration of a normal failure mode. It is therefore useful to consider how steam hoses normally last and thus how the condition of the steam affects hose life.
The chart represents the three forms of water when subjected to heat and pressure. Use only hoses specifically designed for the application.
Gauge Pressure Temperature
psi bar °C °F
25 1.73 130 267
30 2.07 134 274
35 2.42 138 281
40 2.76 141 287
45 3.11 144 292
50 3.45 148 298
60 4.14 153 307
70 4.83 158 316
80 5.52 162 324
90 6.21 166 330
100 6.90 170 338
Gauge Pressure Temperature
psi bar °C °F
120 8.28 177 350
140 9.66 182 361
160 11.04 188 371
180 12.42 193 379
200 13.80 198 388
225 15.53 203 397
250 17.25 208 406
275 18.98 212 414
300 20.70 216 422
325 22.43 221 429
350 24.15 225 437