Spirax Sarco SafeBloc DBB3 Installation And Maintenance Instructions Manual Download Page 2

IM-P184-09 

CMGT Issue 4

2

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TRANSLATION RUN OVER

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

commissioned, used and maintained by 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.

Warning

The body/bonnet gaskets (11a and 11b) contain a thin stainless steel support ring which may cause 

physical injury if not handled and disposed of carefully.

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 product listed below 
complies with the requirement of the Pressure Equipment Directive (PED) and carries the 

 

mark when so required. It should be noted that products that are in category 'SEP' are required by 
the Directive not to carry the 

 mark.

Product

Group 1

Gases

Group 2

Gases

Group 1

Liquids

Group 2

Liquids

Spirax SafeBloc

TM

PN40

DN15 - DN25 

SEP

SEP

SEP

SEP

DN40 - DN50 

2

1

SEP

SEP

DN65 - DN100 

2

1

2

SEP

ANSI 300

DN15 - DN25 

SEP

SEP

SEP

SEP

DN40 - DN100 

2

1

2

SEP

i) The product has been specifically designed for use on steam, compressed air and water/

condensate which are in Group 2 of the above mentioned Pressure Equipment Directive.

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) A number of products are supplied for the intention of the end user (or agent thereof) modifying 

the flange configuration from that supplied. It is the responsibility of the organization carrying 

out the modification to do so in accordance with the internationally recognized standards and 

to ensure that the design rating and operation of the product are not compromised. Spirax 

Sarco will not be held responsible for any unapproved modification or consequential liability 

resulting in failure to observe these requirements.

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

vi) Remove protective covers from all connections and protective film from all name-plates, where 

appropriate, before installation on steam or other high temperature applications.

1. Safety information

Summary of Contents for SafeBloc DBB3

Page 1: ...ct information 3 Installation 4 Commissioning 5 Operation 6 Maintenance 7 Spare parts Copyright 2018 Printed in GB 1849050 3 Spirax SafeBlocTM DBB3 Double Block and Bleed Bellows Sealed Stop Valve Ins...

Page 2: ...are in Group 2 of the above mentioned Pressure Equipment Directive ii Check material suitability pressure and temperature and their maximum and minimum values If the maximum operating limits of the p...

Page 3: ...hocks 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...

Page 4: ...C 752 F 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 protec...

Page 5: ...P or socket weld connection and must be stated at the time of order placement Standards This product fully complies with the requirements of the Pressure Equipment Directive PED and carries the mark w...

Page 6: ...nimum operating temperature Note For lower operating temperatures consult Spirax Sarco 10 C 14 F Designed for a maximum cold hydraulic test pressure of 60 bar g 870 psi g Body design conditions ANSI 3...

Page 7: ...efore commissioning of the line 3 3 The valve can be installed in the horizontal or vertical plane When installed in the horizontal plane the bleed port should ideally be positioned at the bottom see...

Page 8: ...ly closed 5 3 If valve keys are used care must be taken not to use excessive force when opening or closing the valve 5 4 A Valve Integrity Test must be undertaken prior to each double isolation of the...

Page 9: ...harge after a short period consult Spirax Sarco Service Department Note Handwheels should always be opened slowly to avoid system shocks Operation sequence for the Spirax SafeBlocTM Flow Left to Right...

Page 10: ...reassembling ensure that all joint faces are clean Ensure that the correct tools and necessary protective equipment are used at all times When maintenance is complete open isolation valves slowly and...

Page 11: ...sh isolation integrity Step 4 Depressurise the downstream system Step 5 It is now safe to maintain the downstream system Return to Step 1 Please note The Spirax SafeBlocTM is shown with the bellows se...

Page 12: ...be unscrewed from the bonnet bush When the stem 6 is disconnected from the bonnet bush unscrew the gland nut and remove both this and the gland washer Keep these parts safe as they are not supplied a...

Page 13: ...IM P184 09 CMGT Issue 4 13 Fig 4 7 Bonnet bush 10 Bellows support collar 1 9 11b 5 11a Position indicator clip on 6 8 Gland washer Gland nut Locking screw Main handwheel nut 2...

Page 14: ...fully assembled remember to create a safe seal between the gland packing ring 8 and the stem 6 by tightening down the gland nut to the recommended tightening torque see Table 1 6 7 How to fit the disc...

Page 15: ...6 8 Gland washer Gland nut Locking screw Main handwheel nut 2 6 8 Final assembly Ensure the bellows support collar and gaskets 11a and 11b are accurately aligned with the bonnet 2 before final assemb...

Page 16: ...overhaul of the valve 2 x each spare is required 7 Spare parts How to order spares Please note for customer convenience spares are supplied in kits to ensure all the appropriate replacement parts are...

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