Hattersley 370, 371 Installation And Operating Instructions Manual

Installation and Operating Instructions

Bronze
Draining Tap

Fig.370 & Fig.371

CE Marking and the Pressure Equipment Directive 97/23/EC

This has been implemented in United Kingdom law by the Pressure Equipment Regulations
1999 (SI 1999/2001).

The regulations apply to all valves with a maximum allowable pressure greater than 0.5 bar.
Valves with a maximum allowable pressure not exceeding 0.5 bar are outside the scope of
the Directive. Valves are categorised in accordance with the maximum working pressure, size
and ascending level of hazard, which is dependent on the fluid being transported. Fluids are
classified as Group 1, dangerous fluids or Group 2, all other fluids including steam. Categories
are SEP (sound engineering practice) and for ascending levels of hazard, I, II, III or IV. All valves
designated as SEP do not bear the CE mark nor require a Declaration of Conformity.

Categories I, II, III or IV carry the CE mark and require a Declaration of Conformity (Note: all
valves up to and including 25mm (1") having a maximum allowable pressure greater than 0.5
bar are designated SEP regardless of fluid group.)

Product Life Cycle

The life of the valve is dependent on its application, frequency of use and freedom from misuse.
The system into which it is installed must also be compatible with respect to the fluid being
transported with reference to its temperature, pressure and other properties, which may cause
premature failure or non-operability.

A well designed system will take into consideration all the factors considered in the valve
design, but additionally electrolytic interaction between dissimilar metals in the valve and the
system must be examined. Before commissioning a system, it should be flushed to eliminate
debris and chemically cleaned as appropriate to eliminate contamination, all of which will
prolong the life of the valve.

Limits of Use

Operating Pressures and Temperatures

The valve to which these installation, operation and maintenance instructions apply have been
categorised in accordance with the Pressure Equipment Directive.

The fluid to be transported is limited to Group 2 liquids i.e. non-hazardous and on no account
must these valves be used on any Group 2 gases, Group 1 liquids or Group 1 gases.

Fig.370 and Fig.371 Bronze Drain Taps in sizes up to and including 1 inch are categorised as
SEP and do not require the CE mark.

Not suitable for fatigue loading, creep conditions, fire testing, fire hazard environment, corrosive
or erosive service, transporting fluids with abrasive solids.

Pressure/Temperature Rating

Valves must be installed in a piping system whose normal pressure and temperature do not
exceed the above ratings.

The maximum allowable pressure in valves as specified in the standards is for non-shock
conditions. Water hammer and impact for example, should be avoided. If the limits of use
specified in these instructions are exceeded or if the valve is used on applications for which it
was not designed, a potential hazard could result.

Layout and Siting

It should be considered at the design stage where valves will be located to give access for
operation, maintenance or repair.

These drain taps may be installed in any orientation but attention should be paid to surrounding
structures, ensuring that the hose may be easily connected and that the valve operation is not
impaired.

Installation

Prior to installation, a check of the body marking must be made to ensure that the correct valve
is being installed.

PN Non-shock pressure at

temperature range

Non-shock pressure at max
temperature

16

16 bar from -10°C to 120°C 16 bar at 120°C

Hattersley Bronze Draining Tap – Fig.370 & Fig.3711