Spirax Sarco - Catalogo Agosto 2017

Steam consumption

Pipeline ancillaries

Hosedown stations

Litres / minute

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1⁄2"

Maximum ��

flow of

heated water

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Example:

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Maximum

flow of

cold water

Capacities

Steam usage is shown in kg/h with the maximum water flow. If the water flow

reduces then the steam usage will also decrease.

��

Steam flow kg/h (with maximum water flow)

Example:

Pressure bar

0.5

1⁄2"

3⁄4"

Valve type

11⁄2"

100

180

185

125

300

245

175

380

440

135

270

450

565

160

310

520

715

175

335

580

820

Sizes and capacities

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3⁄4"

180

380

600

210

445

665

225

515

735

245

550

830

260

570

905

950

1 070

1 165

1 240

1 290

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The graphs indicate the maximum flow of hot water at various temperatures for a given

steam supply pressure. The bold lines show the maximum cold water flow for a given water

supply pressure. When sizing the valve, ascertain the hot water temperature and quantity

required, and the cold water and steam pressures available.

Plot the cold water supply pressure and read off from the bold line the maximum flow of

cold water. Plot the steam supply pressure against the hot water temperature required and

read off the maximum flow of heated water. For sizing purposes always select the lowest

of the two values because depending on the supply pressures, there can be an imbalance

in the amount of either water or steam heat available. The effect of selecting different

supply pressures or different sizes of valve can easily be compared.

Example

For a cold water supply pressure of 3 bar g the maximum flow of cold water is 40 l/min.

For a steam supply pressure of 6 bar g the maximum flow of hot water at 50°C is 46 l/min.

Safety information

Pressure

Before attempting any maintenance of any component of the steam/water mixing station

consider what is or may have been in the pipeline. Ensure that any pressure is isolated and

safely vented to atmospheric pressure before attempting to maintain any component e.g.

mixing valve, hose etc. This is easily achieved by fitting Spirax Sarco depressurisation

valves type DV (see separate literature for details). Discharge content of hose and station

by pulling the gun trigger and eliminate the pressure until the water flow stops. Do not

assume that the system is depressurised even when the pressure gauges indicate zero.

Allow time for temperature to normalise after isolation to avoid the danger of burns. For

personal protection wear protective clothing, especially heavy duty gloves and safety glasses.

Disposal

This product is recyclable. No ecological hazard is anticipated with the disposal of this

product providing due care is taken.

See the Installation and Maintenance Instructions (IM-P157-03) supplied with each system

before commencing with any maintenance.

Installation

Full details are given in the Installation and Maintenance Instructions (IM-P157-03) supplied

with each system. A typical installation is shown below.

Supply pipework should be sized according to standard practice.The steam inlet should

be sized on the steam flowrate (from the steam consumption chart) at the supply pressure

and a steam velocity of between 15 to 25 m/s.

��

Supply pressure bar g

1"

��

Supply pressure bar g

11⁄2"

��

7.14.4

Temperature

Maintenance

Cold water pipework should take into account pressure, length of pipe and acceptable

pressure drop.

Spares

See Installation and Maintenance

Instructions IM-P157-03 for details.

Typical installation

1 Ball valve

2 Strainer

3 Steam trap

4 Check valve

5 Pressure gauge, syphon and cock

6 Temperature gauge

7 Mixingvalve

8 Mixed water outlet

9 TCO1 temperature cut-out valve

TI-P157-06 ST Issue 9

Steam / Water Mixing Stations - MkII Valve

��

Supply pressure bar g

Example: Cold water supply

Steam supply

bar g

��

Supply pressure