Disclaimer

The information contain in this document should serve as a guide only and installations shall comply with applicable standards, practices and codes set by local building authority and the South African Bureau of Standards (SABS). Installation, modification or repair of INOX’s corrugated stainless steel pipes shall only be performed by a qualified, licensed professional. Only fitting, O’ rings and grommets specified in the applicable standards are to be used in conjunction with INOX’s CSSP. Precautions shall be taken to ensure that, prior to installation or during construction and assembly, INOX CSSP are not damaged or exposed to harmful chemicals.

Recommended Tools

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Utility Knife

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Adjustable or Open Wrench

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Pipe Cutter

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Measure the length of CSSP required between connection points.

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step-2

Use a pipe cutter to cut the CSSP to the requisite length; cutting should be performed on a straight section of pipe and within the corrugations grooves.

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Caution: 
Take care when handling the pipe, edges could be sharp.
When possible avoid uneven or sharp edges as they could damage O’ rings or Grommets.
Prior to installation thoroughly inspected the pipe for cuts, as to avoid leaks.

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step-3

Prior to installing fittings, PVC sleeving (where CSSP is sleeved) should be removed from the end of the pipe. Using a utility knife, strip the PVC Sleeving back five (5) grooves or ~ 2.5cm from the end of the pipe.

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step-4

Disassemble the (selected) brass compression fittings, and remove the O’ ring and grommets’ sets from their packets. Each set should have an outer PTFE outer grommet (white), Silicon O’ rings (red or black) and PTFE inner guide (white), each compression fitting requires one complete set.

yieldCaution: Inox CSSPs and ring sets are design to work with brass compression fitting complying with SANS 1067-1. Using Inox CSSP with fitting which do not confirm to the above specification may result in leaks and the loss of warranty.

step4

step-5

Assemble the CSSP, compression fitting and seals as follows:
a) Fit the compression fitting’s nut on to the pipe, fit the outer grommet into pipe and nut as shown.
b) Fit the O’ Ring onto the pipe as shown
c) Fit the inner guide to the second nut as show
d) Tighten fitting by hand as shown.
e) The assembled fitting and CSSP are now ready to connect to another fittings, when Tightening use a wrench and follow the provide Torque values.

STEP A

STEP B

STEP C

STEP D

STEP E

STEP F

yieldCaution: If the tubing begins to buckle or deform, you have tightened too much. If damaged, cut off section of damaged tubing and re-attach fitting using method above.

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Important Notes

Fixing Methods

a) Fixing fasteners – When fixing Inox CSSP to walls or other surfaces use Clips, holderbats or saddles, of stainless steel or plastic (UV stabilized for fittingoutside use), unless the pipe is sleeved in which case any appropriate materials can be used.
b) Fixing distances (spacing) – Horizontal runs shall be supported at a minimum of 30 cm to 50 cm intervals, vertical runs should be supported at a minimum of 50 cm to 60 cm, all fixed to the structure.
c) Fixing at valves and terminal fittings – Fix on both sides of valve or fittings within a maximum distance of 5 cm, and on formed bends within 5 cm of each side of the bend. Terminal fittings shall be securely fixed to the structure using wall plates before connecting the pipe.

Underground & in wall applications

When using INOX CSSPs in underground application or within walls, the following protection methods are recommended:

  • PVC coating – some version of INOX CSSP are provided with PVC coating, these pipes are suitable for use underground and in walls.
  • Zinc-rich epoxy primer – applying zinc-rich epoxy coating directly onto the stainless steel surface will create sufficient protection for the pipe to be installed in the above environments.
  • Thermally sprayed aluminium (TSA) – applying TSA coating directly onto the stainless steel surface will create sufficient protection for the pipe to be installed in the above environments.

Important Note: although stainless steel provide good corrosion resistance under most conditions, in certain environments, such as certain soil types or when underground electrical current is present, corrosion processes may be accelerated  and therefore additional protection is necessary.

The following are some additional steps that can help in reducing the risk of corrosion:

  • Pack soil uniformly, as variable compaction can induce differential aeration effects. Stainless steels generally retain their passive film provided there is at least a few ppb of oxygen, i.e. 1000 times less than the concentration in water exposed to air.
  • Avoid organic materials in the fill around buried stainless steel pipe, as they can encourage microbial attack.
  • Avoid carbon-containing ash in the soils as it can promote localised galvanic attack on stainless steel.
  • Oxygen access is critical; this can be done with the aid of good drainage and sand backfill.
  • Avoid a sand-filled trench dug through clay, as it may become a drain which can exacerbate corrosion.
  • The general guidelines for immersed service are that in neutral environments at ambient temperatures and without crevices, 304/304L may be used up to chloride levels of 200ppm, 316/316L up to about 1000ppm chloride and duplex (2205) up to 3600ppm chloride. The super duplex alloys (PRE>40) and the 6% molydenum super austenitic stainless steels are resistant to seawater levels of chloride, i.e. approximately 20,000ppm.
  • Stray currents. All buried metals, including stainless steels, are at risk if there are stray currents from electrically driven transport, incorrectly installed or operated cathodic protection systems, or earthing faults in switchboards. Stray current corrosion can be identified as it causes localised general loss rather than pitting. It is also very rapid.
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