Building Services Non-WRAS EPDM Assembly
Compression End Connections

Hose

EPDM Rubber

Braid

304 Stainless Steel

Washer

Fibre/Rubber

Insulation

N/A

• Fan Coils
• Heating and Ventilation
• Building Services

• Non WRAS Plumbing
• Domestic
• Other

Every assembly produced at Hydraflex undergoes a rigorous visual inspection, to ensure that only quality products are supplied. See the below standards that Hydraflex meet:

• 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

Diagram 3 displaying the overall length and cut length of a hose assembly

The arrow on drawing D2 denotes the 'R' measurement showing the 'Minimum Bore Through Fittings (mm)' which is reduced through the fitting tail, with a tolerance of +/- 0.2mm. The below measurements represent the minimum bore of each DN size; however, fittings will vary in bore size. For further information regarding this please contact out technical department. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

DN Size	Hose Bore (Inches)	Hose Bore (mm)	R = Minimum Bore Through Fittings (mm)
DN06	1/4"	6	4.2
DN08	5/16"	8	5.7
DN10	3/8"	10	6.7
DN13	1/2"	13	8.7
DN19	3/4"	19	14.8
DN25	1"	25	19.8
DN32	1 1/4"	32	25.5
DN40	1 1/2"	40	31.8
DN50	2"	50	40.4

DN	D	R	A	B	L	Z/d90deg	Z/180deg	Z/d360deg
DN08	12	27	27	18	78	132	174	258
DN10	14	40	40	20	107	183	246	258
DN13	18	60	60	22	151	258	352	540
DN16	22	70	70	25	176	300	410	630
DN19	27	80	80	29	202	344	470	722
DN25	34	100	100	33	250	423	580	894
DN32	44	160	160	37	379	645	896	1398
DN40	54	180	180	50	437	743	1026	1592
DN50	64	230	230	56	548	933	1294	2016

Working Pressure Bar (Tolerance +/- 1 Bar)
		Temperature
Part No.	Bore	20°C	30°C	40°C	50°C	60°C	70°C	80°C	90°C	100°C
BX08	DN08	20	20	20	20	18	18	17	17	16
BX10	DN10	20	20	20	20	18	18	17	17	16
BX13	DN13	20	20	20	20	15	15	14	14	13
BX19	DN20	16	16	16	16	12	12	11	11	11
BX25	DN25	10	10	10	9	9	9	9	9	9
BX32	DN32	10	10	10	8	8	8	8	8	8
BX40	DN40	6	6	6	5	5	5	5	5	5
BX50	DN50	6	6	6	5	5	5	5	5	5

Theoretical Minimum Burst Pressure (Bar)
		Temperature
Part No.	Bore	20°C	30°C	40°C	50°C	60°C	70°C	80°C	90°C	100°C
BX08	DN08	120	120	120	120	115	110	100	90	66
BX10	DN10	120	120	120	120	115	110	100	90	66
BX13	DN13	90	90	90	90	88	86	83	80	53
BX19	DN20	80	80	80	80	79	78	76	75	43
BX25	DN25	60	60	60	60	58	57	56	55	36
BX32	DN32	50	50	50	50	48	47	46	45	30
BX40	DN40	30	30	29	28	27	27	26	25	25
BX50	DN50	24	24	23	22	22	21	20	20	19

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 Ensure that STAMPED is followed prior to fittings any flexible hose to ensure that the hose is fit for purpose. Taking into consideration the maximum working parameters for operating and testing including; pressure, temperature, environment, medium. Making sure any additional factors are considered prior to installation and ensuring the hose assembly meets or exceeds the parameters of the application e.g. Consider using elbow fittings where tight bending is required.This information must not be assumed and is essential the correct due diligence has been undertaken. 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]