Spirax Sarco DP27T Manuale utente

IM-P240-02-EN-ISS1 CTLS 1

DP27T

DP27TE

1. Safety information

2. General product

information

3. Installation

4. Commissioning

5. Maintenance

6. Spare parts

7. Fault finding

4701036/3

DP27T and DP27TE

Pilot Operated Pressure/Temperature

Control Valves

Installation and Maintenance Instructions

PREVIOUS REFERENCE NO. IM-P470-09

Printed in GB

IM-P240-02-EN-ISS1

CTLS

IM-P240-02-EN-ISS1 CTLS2

IM-P240-02-EN-ISS1 CTLS 3

1. Safety information

Safe operation of these products can only be guaranteed if they are properly

installed, commissioned, used and maintained by suitably qualified personnel (see

Section 1.11) 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 Intended use

Referring to the Installation and Maintenance Instructions, name-plate and Technical

Information Sheet, check that the product is suitable for the intended use/application.

The products listed below comply with the requirements of the Pressure Equipment

Directive (PED) and carry the mark when so required. The products fall within

the following Pressure Equipment Directive categories:

Product Group 2

Gases

DP27T and DP27TE

DN15 - DN40 SEP

DN50 1

i) The products have been specifically designed for use on steam, air and inert

industrial gases which are in Group 2 of the above mentioned Pressure Equipment

Directive. The products’ use on other fluids may be possible but, if this is

contemplated, Spirax Sarco should be contacted to confirm the suitability of the

product for the application being considered.

ii) Check material suitability, pressure and temperature and their maximum and

minimum values. If the maximum operating limits of the product are lower than

those of the system in which it is being fitted, or if malfunction of the product

could result in a dangerous overpressure or overtemperature occurrence, ensure

a safety device is included in the system to prevent such over-limit situations.

iii) Determine the correct installation situation and direction of fluid flow.

iv) Spirax Sarco products are not intended to withstand external stresses that may

be induced by any system to which they are fitted. It is the responsibility of the

installer to consider these stresses and take adequate precautions to minimise

them.

v) Remove protection covers from all connections and protective film from all

name-plates, where appropriate, before installation on steam or other high

temperature applications.

1.2 Access

Ensure safe access and if necessary a safe working platform (suitably guarded)

before attempting to work on the product. Arrange suitable lifting gear if required.

1.3 Lighting

Ensure adequate lighting, particularly where detailed or intricate work is required.

IM-P240-02-EN-ISS1 CTLS4

1.4 Hazardous liquids or gases in the pipeline

Consider what is in the pipeline or what may have been in the pipeline at some

previous time. Consider: flammable materials, substances hazardous to health,

extremes of temperature.

1.5 Hazardous environment around the product

Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,

extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive

noise, moving machinery.

1.6 The system

Consider the effect on the complete system of the work proposed. Will any proposed

action (e.g. closing isolation valves, electrical isolation) put any other part of the

system or any personnel at risk?

Dangers might include isolation of vents or protective devices or the rendering

ineffective of controls or alarms. Ensure isolation valves are turned on and off in

a gradual way to avoid system shocks.

1.7 Pressure systems

Ensure that any pressure is isolated and safely vented to atmospheric pressure.

Consider double isolation (double block and bleed) and the locking or labelling of

closed valves. Do not assume that the system has depressurised even when the

pressure gauge indicates zero.

1.8 Temperature

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

1.9 Tools and consumables

Before starting work ensure that you have suitable tools and/or consumables

available. Use only genuine Spirax Sarco replacement parts.

1.10 Protective clothing

Consider whether you and/or others in the vicinity require any protective clothing

to protect against the hazards of, for example, chemicals, high/low temperature,

radiation, noise, falling objects, and dangers to eyes and face.

1.11 Permits to work

All work must be carried out or be supervised by a suitably competent person.

Installation and operating personnel should be trained in the correct use of the

product according to the Installation and Maintenance Instructions.

Where a formal 'permit to work' system is in force it must be complied with. Where

there is no such system, it is recommended that a responsible person should know

what work is going on and, where necessary, arrange to have an assistant whose

primary responsibility is safety.

Post 'warning notices' if necessary.

IM-P240-02-EN-ISS1 CTLS 5

1.12 Handling

Manual handling of large and/or heavy products may present a risk of injury. Lifting,

pushing, pulling, carrying or supporting a load by bodily force can cause injury

particularly to the back. You are advised to assess the risks taking into account

the task, the individual, the load and the working environment and use the appropriate

handling method depending on the circumstances of the work being done.

1.13 Residual hazards

In normal use the external surface of the product may be very hot. If used at the

maximum permitted operating conditions the surface temperature of some products

may reach temperatures of 300 °C.

Many products are not self-draining. Take due care when dismantling or removing

the product from an installation (refer to 'Maintenance instructions').

1.14 Freezing

Provision must be made to protect products which are not self-draining against

frost damage in environments where they may be exposed to temperatures below

freezing point.

1.15 Disposal

Unless otherwise stated in the Installation and Maintenance Instructions, this

product is recyclable and no ecological hazard is anticipated with its disposal

providing due care is taken.

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.

1.16 Returning products

Customers and stockists are reminded that under EC Health, Safety and Environment

Law, when returning products to Spirax Sarco they must provide information on

any hazards and the precautions to be taken due to contamination residues or

mechanical damage which may present a health, safety or environmental risk. This

information must be provided in writing including

Health and Safety data sheets relating to any substances identified as hazardous

or potentially hazardous.

IM-P240-02-EN-ISS1 CTLS6

2. General product information

2.1 General description

The DP27T and DP27TE are combined pressure

temperature control valves for use on

steam applications. They are designed to be used in conjunction with a 2 m length of

capillary which is available separately (other lengths available on request). They combine

a temperature and pressure pilot valve in one unit. This controls the main valve so that the

temperature is maintained while the maximum steam pressure is limited.

A variable rate conical pressure adjustment spring is fitted providing a downstream pressure

range of 0.2 - 17 bar g.

Notes: 1. The sensor of the control system will need to be mounted by either a union kit,

pocket or wall mounting bracket.

2. For additional information see the relevant Technical Information Sheet.

Available types of valve:

DP27T Pressure/temperature control

DP27TE Pressure/temperature control with electrically operated solenoid valve

2.2 Sizes and pipe connections

Screwed BSP (BS 21 parallel) or NPT (½" to 1" only).

Flanged DN15LC - Low Capacity version, DN15, DN20, DN25, DN32, DN40 and DN50.

Flanges:

Standard

DN15 - DN50 EN 1092 PN25

DN25 - DN50 BS 10 Table H and ASME (ANSI) 300

Available on request:

DN15 - DN50 JIS 10, JIS 16 and ASME (ANSI) 150

DN15 - DN20 BS 10 Table F

DN15 ASME (ANSI) 300

Note: For additional information see the relevant Technical Information Sheet.

IM-P240-02-EN-ISS1 CTLS 7

DP27TE

DP27T Temperature ranges

Range A 16 °C to 49 °C

Range B 38 °C to 71 °C

Range C 49 °C to 82 °C

Range D 71 °C to 104 °C

Range E 93 °C to 127 °C

IM-P240-02-EN-ISS1 CTLS8

2.3 Pressure / temperature limits

100

150

200

190

232

5 10 15 17.2 20 25

Pressure bar g

Temperature °C

Steam

saturation

curve

The product must not be used in this region.

A-D-E Screwed and flanged EN 1092 PN25, ASME (ANSI 300), and BS 10 Table H.

A-B-C Flanged ASME (ANSI) 150.

G-G The DP27TE is limited to 10 bar g @ 190 °C.

Body design conditions PN25

Maximum design pressure

A-D-E 25 bar g @ 120 °C

A-B-C 17.2 bar g @ 40 °C

Maximum design temperature 232 °C @ 21 bar g

Minimum design temperature -10 °C

Maximum upstream pressure for saturated steam service

DP27T 17 bar g

DP27TE 10 bar g

Maximum operating temperature

DP27T 232 °C @ 21 bar g

DP27TE 190 °C @ 10 bar g

Minimum operating temperature

Note: For lower operating temperatures consult Spirax Sarco.

0°C

Maximum differential pressure

DP27T 17 bar

DP27TE 17 bar

Designed for a maximum cold hydraulic test pressure of: 38 bar g

Note: With internals fitted, test pressure must not exceed: 25 bar g

IM-P240-02-EN-ISS1 CTLS 9

DP27T

DP27TE

Fig. 1

Control head securing screws

3. Installation

Note: Before actioning any maintenance programme observe the 'Safety

information' in Section 1.

Referring to these Installation and Maintenance Instructions, name-plate and

Technical Information Sheet, check that the product is suitable for the intended

installation.

The installation instructions are dealt with under two headings, 'The valve' and 'The

temperature control system'.

IM-P240-02-EN-ISS1 CTLS10

3.1 Supply (Figure 1)

DP27T

The DP27T pressure/temperature control is supplied with the temperature control unit

packed separately and should be assembled securing the control head to the valve by

means of the three screws supplied.

The valve is fitted with a control spring most suited to the downstream pressure condition

quoted on the order, but will not be pre-set.

The temperature control unit is fitted with a control system having a range most suited to

the temperature given on the order but it is not pre-set.

DP27TE

The DP27TE pressure/temperature control is supplied as for the DP27T but a solenoid

operated valve is fitted in the pipe between the pilot valve and the main diaphragm chamber,

thus in series with the normal pilot valve.

The purpose of the solenoid valve is to override the pilot valve thus causing the main valve

to shut-off. It can be controlled by any device capable of interrupting the supply of current

to the solenoid coil such as a thermostat, pressure switch or time clock. A suitable time

clock is available from Spirax Sarco.

The solenoid is arranged to open the valve when the coil is energised so that whatever

switching device is used it must be arranged to break the current to close the main valve.

In this way the unit will always 'fail-safe' i.e. will close the main valve in the event of a failure

in electrical supply.

Electrical supply

It is important that the solenoid is connected to the correct voltage. The standard unit is

suitable for 230 ±10%Vac or 115 ±10% Vac 50 Hz supply, but units for other ac voltages

may be supplied to special order, therefore always check on the supply details which are

stamped on the solenoid valve name-plate before attempting to connect up.

Electrical connection is by cable plug to DIN 43650. Remember that the valve is on a steam

supply line and in use will get hot. All wiring, connectors, etc. in close proximity to the valve

should therefore be of heat resisting type.

Earth

The solenoid valve should be adequately earthed.

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