Spirax Sarco MkII Guida

IM-P157-38 CMGT Issue 4 1

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

These instructions should be read by the Company Safety Officer

1. General safety information

2. General product information

3. How to size

4. Installation

5. Maintenance

6. Spare parts

7. Fault finding



Steam/Water Mixing Stations

(MkII valves - 2002 onwards)

Safety and Operation

Installation and Maintenance Instructions

IM-P157-38

CMGT Issue 4

Printed in GB

IM-P157-38 CMGT Issue 4

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

IM-P157-38 CMGT Issue 4 3

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

Safe operation of the unit can only be guaranteed if it is properly installed, commissioned and

maintained by a qualified person (see Section 11 of the attached Supplementary Safety Information)

in compliance with the operating instructions. General installation and safety instructions for

pipeline and plant construction, as well as the proper use of tools and safety equipment must

also be complied with.

1.1 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 contents of the hose and station by pulling the gun trigger and

eliminate pressure until water flow stops. Do not assume that the system is depressurised even

when the pressure gauge indicates zero.

1.2 Temperature

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.

PTFE:

If parts made from PTFE have been subjected to a temperature approaching 260 °C (500 °F) or

higher, they will give off toxic fumes, which if inhaled are likely to cause temporary discomfort.

It is essential for a no smoking rule to be enforced in all areas where PTFE is stored, handled, or

processed as persons inhaling the fumes from burning tobacco contaminated with PTFE particles

can develop 'polymer fume fever'.

Viton:

If parts made from Viton have been subjected to a temperature approaching 315 °C (599 °F) or

higher, it may have decomposed and formed hydrofluoric acid. Avoid skin contact and inhalation

of any fumes as the acid will cause deep skin burns and damage the respiratory system.

1.3 Disposal

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

providing due care is taken, except;

PTFE:

-Can only be disposed of by approved methods, not incineration.

-Keep PTFE waste in a separate container, do not mix it with other rubbish, and consign it to

a landfill site.

Viton:

-Can be land filled, when in compliance with National and Local regulations.

-Can be incinerated, but a scrubber must be used to remove Hydrogen Fluoride, which is evolved

from the product and with the compliance to National and Local regulations.

-Is insoluble in aquatic media.

1. Safety information

IM-P157-38 CMGT Issue 4

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation



This product must only be installed and commissioned by qualified personnel

(see Section 1.5).

The hosedown station includes a safety device called the TCO1. This temperature cut-out valve

activates at a temperature of 95 °C (203 °F) to limit the discharge of steam in the event of a system

fault. This assumes 20 m (65.6 ft) hose installed - shorter length hoses may result in a brief discharge

of steam following activation of the TCO1.

The mixing valve must always be operated with an element in the TCO1 to prevent steam reaching

the hose. In the event that the hosedown station is used without an element in the TCO1 then

Spirax Sarco will not accept any consequential liability for the operation of the hosedown station

in this manner.

Always operate the hosedown station as instructed on the warning notice sent out with the

equipment; particularly regarding protective clothing. The WARNING NOTICE must always be

displayed by the mixing valve.

1.5 Qualified personnel

For the purposes of these operating instructions qualified personnel are persons who are

experienced in the installation, commissioning and operation of this product and who are suitably

qualified to perform their duties, e.g.:

-Have received training or instruction in the maintenance and use of appropriate safety equipment

according to current safety standards.

-Have received training in first-aid.

1.6 Safety test procedure

A safety check undertaken by qualified personnel must be carried out each time the unit is used.

The safety test and subsequent maintenance procedure ensures that live steam cannot be

discharged from the gun, which would happen in the event of e.g. a seized piston.

Due to the possible presence of steam, please ensure due care and attention are observed when

undertaking this task. Wear protective clothing, especially heavy duty gloves and safety glasses.

With the cold water inlet valve shut and the steam inlet valve open, carefully operate the gun. Before

pulling the trigger, hold the gun firmly in both hands and adopt a body position which will prevent

loss of balance due to recoil from the hose gun.

There should be no flow observed at the gun. If steam flow is detected during the test, or the

TCO1 activates, the hosedown station, it must be taken out of service immediately. Please refer

to Section 5, 'Maintenance'.

The above test must be repeated after maintenance to the steam/water mixing valve.

IM-P157-38 CMGT Issue 4 5

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

1.7 Danger of injury

Should you intend to use Spirax Sarco products for new or not tested fluids or for applications

not described in Spirax Sarco product information please contact the Spirax Sarco applications

department or our local sales engineer for written advice.

All hose and gun assemblies are to be tested for operational safety from time to time. This should

include a daily visual inspection. If damage occurs (this also applies to the hose cover) the hose

and gun assemblies must be renewed, for safe working.

The same constant vigilance should also be applied to the valve and its fittings and the hosedown

gun.

The mixing valve must always operate with an element in the TCO1 to prevent steam reaching the

hose. In the event that the hosedown station is used without an element in the TCO1 then Spirax Sarco

will not accept any consequential liability for the operation of the hosedown station in this manner.

IM-P157-38 CMGT Issue 4

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

2.1 General information

Note: These Installation and Maintenance Instructions are for MkII systems/

valves supplied from the year 2002 onwards. For earlier valves, see separate

Installation and Maintenance Instructions IM-P157-03.

Design

The Spirax Sarco steam/water mixing station is designed to provide hot water economically by blending

steam and cold water quickly to the required user temperature. This temperature can be altered by turning

the temperature adjustment knob. As the valve is not thermostatically controlled, in order to maintain a fixed

hot water temperature the cold water pressure and flowrate must be constant. The temperature cut-out valve

TCO1 will limit any steam supply from the mixing valve in the event of a system fault.

Operation

The mixing valve employs a piston to lift and open the steam valve. The piston is lifted by the cold water

supply. If the cold water supply stops the piston will fall, closing the steam valve.

Maintenance

This operation can only occur if the piston is free to move. Scale will seize the piston and the valve must be

maintained and cleaned regularly to prevent scale build-up and ensure safe valve operation. This is especially

important in hard water areas. The pressure gauges supplied with the mixing station are installed in the steam

and cold water supply lines to aid fault finding.

Ancillaries

Each steam/water mixing station is supplied with isolation valves, check valves, union joints, steam trap,

strainers (with 100 mesh stainless steel screens), pressure gauges, syphon and cocks, thermometer and

temperature cut-out valve (see Figure 1).

Note: For further information see the following Technical Information Sheets:

TI- P157- 05 Hosedown gun, hose and hose rack

TI- P157- 06 Steam/water mixing stations

TI- P157- 08 Steam/water mixing valve

TI- P157-18 TCO1 temperature cut-out valve

These sheets give full details of:- Materials, sizes and pipe connections, dimensions, weights, operating

ranges and capacities.

2. General product information

IM-P157-38 CMGT Issue 4 7

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

Fig. 1 ¾" and 1½" assembly shown

Steam

inlet

Steam

inlet

Cold

water

inlet

Cold

water

inlet

Hot water outlet

†

Inter connecting pipe is not supplied with the mixing valve station. This pipe should be at least 0.5 m (19.3")

long to prevent condensate backing up into the steam line.

†

½" and ¾"

station only

½" and ¾"

station only

1½" station only1½" station only

IM-P157-38 CMGT Issue 4

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

2.2 Technical data

2.2.1 Minimum flow (to open the steam valve) and spring selection chart

(see Table 1)

A restricted outlet can cause back pressure, reducing the water flow through the mixing valve which may

prevent a sufficient amount of steam entering the mixing chamber.

The minimum flow for each size of mixing valve is shown in Table 1 below.

Note: when a valve supplies water against a back pressure a minimum pressure drop of approximately

1 bar (14.5 psi) is required across the mixing valve to allow the steam valve to lift off its seat.

Table 1

Size Spring

value

Spring

colour

code

Steam pressure Min. flow to

open steam

valve

Spring

notch

marking

psi bar kg/cm2g/min l/min

½"

High Y 100 - 150 7. 0 0 - 10.3 7.14 - 10.51 1.0 4.5 Three

Medium G 50 - 100 3.50 - 7.0 3.57 - 7.14 0.6 2.7 Two

Low Bl 5 - 50 0.35 - 3.5 0.36 - 3.52 0.5 2.3 One

¾"

High R 100 - 150 7. 0 0 - 10.3 7.14 - 10.55 1.8 8.2 Three

Medium B 50 - 100 3.50 - 7.0 3.57 - 7.14 1.5 6.8 Two

Low W 5 - 50 0.35 - 3.5 0.36 - 3.52 6.0 6.8 One

High R 100 - 150 7. 0 0 - 10.3 7.14 - 10.51 8.0 36.3 Three

Medium B 50 - 100 3.50 - 7.0 3.57 - 7.14 7.0 31.8 Two

Low W 5 - 50 0.35 - 3.5 0.36 - 3.52 6.0 2 7. 2 One

1½"

High R 100 - 150 7. 0 0 - 10.3 7.14 - 10.51 12.0 54.4 Three

Medium B 50 - 100 3.50 - 7.0 3.57 - 7.14 12.0 54.4 Two

Low W 5 - 50 0.35 - 3.5 0.36 - 3.57 12.0 54.4 One

*Y = Yellow

G = Green

Bl = Black

R = Red

B = Blue

W = White

IM-P157-38 CMGT Issue 4 9

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

2.3 Options for ½" and ¾" steam/water mixing stations

2.3.1 Hose

Temperature

range

-30 °C to +170 °C (-22 °F to +338 °F) for saturated steam

95 °C (203 °F) for continual hot water operation

Safety factor 10:1 for steam, 3.15:1 at 18 bar (261 psi) working pressure

Lining EPDM rubber, white, smooth, compounded using FDA approved ingredients

Reinforcement High strength synthetic textile

Cover EPDM rubber, blue, weather, ozone and abrasion resistant

Identification Type 1 Continuous

longitudinal white

band

T739 WP 7 bar (101.5 psi)

170 °C (338 °F)

Type 2 White band ARCO 39174 - FDA, Food/steam 7 bar

170 °C

2.3.2 Hosedown gun

There are two sizes of hosedown gun; the ½" gun used with the ½" hose and ½" steam/water mixing station.

Similarly the ¾" gun used with the ¾" hose and ¾" steam/water mixing station. Hosedown guns and hoses

should never be used with 1" and 1½" steam/water mixing stations (see Figure 2).

Temperature 100 °C (212 °F)

Maximum pressure 10 bar g (145 psi g)

Capacity With wide spray 42 l/min at 5 bar (9.25 gal/min at 72.5 psi)

With jet spray 25 l/min at 5 bar (5.50 gal/min at 72.5 psi)

Capacities (approximate)

Litres/minute

Supply pressure bar g

Fig. 2

IM-P157-38 CMGT Issue 4

Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation

500

400

300

200

100

0 1 2 3 4 5 6 7 8 9 10

40 °C

50 °C

60 °C

70 °C

80 °C

90 °C

350

300

200

100

0 1 2 3 4 5 6 7 8 9 10

40 °C

50 °C

60 °C

70 °C

80 °C

90 °C

100

0 1 2 3 4 5 6 7 8 9 10

40 °C

50 °C

60 °C

70 °C

80 °C

90 °C

200

150

100

0 1 2 3 4 5 6 7 8 9 10

40 °C

50 °C

60 °C

70 °C

80 °C

90 °C

100

0 1 2 3 4 5 6 7 8 9 10

40 °C

50 °C

60 °C

70 °C

80 °C

90 °C

Supply pressure bar g

(Please note: Only SI metric figures have been used in this section)

The graphs indicate the maximum flow of hot water at various temperatures for a given steam supply pressure.

The bold line shows 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 water and steam pressure available. The

cold water and steam supply pressure should be nominally equal for satisfactory operation.

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 running 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.



l/min. then the ½

need to select a ¾" mixing valve (although the ½" mixing valve can pass 40 l/min of cold water), since the



Sizing example:

For cold water supply pressure of 3 bar g

the maximum flow of cold water is 40 l/min.

For steam supply pressure of 3.5 bar g the

maximum flow of hot water at 50 °C is 32 l/min.

Supply pressure bar g

3. How to size

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