Building Services Non-WRAS EPDM Assembly
BSPT Male End Connections

Hose

EPDM Rubber

Braid

304 Stainless Steel

Washer

Fibre

Insulation

N/A

• Fan Coils
• Heating and Ventilation
• Building Services

• Non WRAS Plumbing
• Domestic
• Other

• Manufactured under ISO 9001:2015 Procedures BSRIA BG4-2004
• RoHS 3 (EU
• 2015/863)
• EPP

• REACH
• BFPA
• 100% pressure tested and certificate available on
  request

Schedule 1

Schedule 1

Formula: Pc = (TxL) + R (in mbar)

Pc = Pressure Drop in mbar
T = Pressure drop in mbar for one meter of hoses according to its flow capacity in M3/h (Schedule 1)
L = Hose Length in meters
R = Pressure drop in mbar caused by two fittings (male x female), same condition than 'T' (Schedule 2)

Flexible hose with one straight and one elbow fittings= R x 1.5
Flexible hose with two elbow fittings = R x 3
Example:
Flexible hose DN13 length 500mm 1 FP - MC, flow capacity 1000 l/h
Pc = (26 mbar/m x 0.5m) + 23 mbar = 36 mbar
Flexible hose DN25 length 800 1 FP - FPN, flow capacity 1500 l/h
Pc = (3mbar/m x 0.8m) + (2.5 mbar x 1.5) = 9 mbar

Note: 'T' value only valid for hoses installed straight. Installation with bend can cause pressure drop relative to decrease in bend radius.

Prior to Installation

Installation

• Before fitting ensure that there is no visible damage to the hose (if in doubt do not proceed to fitting the assembly).
• Ensure there is a slack on the hose with straight ends, as a tightly fitted hose may fail prematurely.
• Ensure that bend radii of the hose are not exceeded and there is sufficient length of hose to allow for a smooth curve. Do not bend hoses near to the crimped end fitting or twist and/or stretch hoses.
• Ensure where fittings with washers are used that the mating part is not sharp or uneven as this may damage the washer or prevent a secure seal.
• Ensure any hoses requiring insulation have sealed ends, failure to do so is likely to result in a build-up of moisture, resulting in corrosion and hose failure.
• Do make sure that the hose will not be rubbing on any edges once installed.
• Do use the correct type and size of tool when making the connections and ensure you do not over tighten fittings; over tightening may result in stress corrosion cracking (SCC).

N.B. Please be aware that external factors, included but not limited to heat, flux, solder, chemicals and condensation are likely to result in premature failure of a hose assembly.

Post Installation Check List

• Ensure circuits are flushed to clear any debris in accordance with current standards.
• Pressure test the circuit to ensure all connections are sound and secure in accordance with current standards.
• Hoses should be inspected at regular intervals for signs of corrosion or damage.

While this is an extensive list it is not exhaustive and should be used solely for guidance, if you require further information or clarification then please contact our technical support team. Failure to observe and comply with the above guidance notes may result in a hose failure and invalidate any warranty.

For anymore information that you may require then please contact one of our team.

Tel: 0845 260 4334 Email: [email protected]