Heat exchangers
BS EN 307:1999 pdf free.Heat exchangers-Guidelines for preparing installation, operating and maintenance instructions required to maintain the performance of each type of heat exchanger.
3.3 Instructions
3.3.1 installation instructions documents describing the basic conditions for correct installation and how the installation is carried out, and giving directions for adjusting control equipment The installation instructions should be such that proper operation and maintenance can be carried out.
3.3.2 operating instructions documents describing how the equipment is intended to function and what measures are required for proper operation; operating instructions also describe systems and components as well as the location, principle of function and safety requirements of the heat exchanger The operating instructions do not include maintenance routines.
3.3.3 maintenance instructions documents describing when and how both remedial and preventive maintenance measures should be taken,together with the procedures to be used The term“instructions for care” shall not be used;“operating instructions” and/or“maintenance instructions” should be the term(s) used.
4 Installation instructions
Installation instructions shall include a description (see 5.1) of the heat exchanger and information under the following headings where applicable.
4.1 Accessibility
4.1.1 Geometric and mass data Data necessary in order to be able to select lifting and transporting equipment; for example:
a) dimensions in delivery state (including packaging);
b) mass including and excluding packaging;
c) free volume available on the primary and secondary side.
4.1.2 Transport paths
Requirements for transport paths to permit transport into the premises (e.g daylight openings, corridor widths) shall be identified.
4.1.3 Inspection facilities
Requirements for the necessary distance to adjacent,fixed building components and the like, to permit adjustment, inspection, cleaning, replacement of components etc.
4.2 Base design
Requirements for the base design, vibration damping etc, and the mass and volume of the heat exchanger parts flled with fluid (for calculating the total weight in operation).
4.3 Performance measurements
Description of measures which are required to determine necessary performance data of the heat exchanger system (e.g. measuring location,temperature-protective pipe) in accordance with prEN 328, prEN 1117, prEN 327, prEN 1048, prEN 1148,prEN 1216, prEN 1397, prEN 1118, EN 305, EN 247,EN 306 and EN 308.
4.4 Connection to system or plant
4.4.1 Connection and direction offlow
The connections shall be clearly marked (ie. supply, return, primary flow, secondary flow, condensate drainage).
4.4.2 Installation orientation
The design orientation shall be defined (i.e. vertical,horizontal, tilted situation, settling length).
4.4.3 By-pass connection
A clear indication shall appear on the heat exchanger if it has an internal variable by-pass.
4.4.4 Thermal insulation
A specification of if or how thenital insulation shall be execut((1. Note that it shall be possible in certain cases to remove the insulation, for example when inspecting jressure vessels.
4.4.5 lIghtness
A six’cification of the measures required for ensuring tightness in connections shall be provided.
4.5 Name plate
All heat exchangers shall be marked with information on maximum service properties. 1’he name plates shall give at least the following information:
a) nanie of the manufacturer or suI)l)1ier b) the manufacturer’s i(lentLficalion number (designation).
This infonnat ion shall be completed by details of the nature of the fluids, their maximum vressure aiid temperature in service.
There is no need for identification for series-produced (levices or those nicorporated Lnt() assemblies sold, installed and identified as a complete product..
NOTE Additional information may be required, for example for pressure vessels, to satisfy contractual or legal requirements.
5 Operating instructions
The operating instnictions shall include information under the following headings where aj)plicable.
5.1 Classification, description
A specification of the type of heat exchanger shall exist in accordance with EN 247:1997, as well as a description of the heat exchanger (design, function, operating conditions), drawings, indications of connections and flow directions.
5.2 Control equipment
A description and circuit diagrams of regulating,
control and alarm functions shall exist.
53 Set values (adjustment report)
A compilation of the set values applied when carrying out adju.stments shall exist.. The provisions of clause 6 of EN 305:1997 concerning the test procedures shall be fulfilled.
5.4 Operating range
A SIWcificatk)fl of the operating range (pressure,
temperature, flow) and pemiissible operating variations
shall exist.
5.5 Stop, start, shutdown
A description of how the plant is started and stopped with regard to the heat exchanger and how shutdowns are carried out shall exist. Particular provisions in case of cornsion, fouling etc. after shutdowns or (k)wntinle shall be indicated. Other information necessary for operation shall also be provided.
5.6 Mea.sures in connection with fire and operational downtime
A specification of the measures to be taken in coflnection with fault alarms, operational downtime or fire shall be provided
5.7 Current safety regulations
A list of relevant safety regulations applicable II) the
heat exchanger (e.g. preure vessels, toxicity, leakage)
shall be provided.
6 Maintenance instructions
The maintenance instructions shall include the headings given in 6.1 where applicable.
The relevant maintenance items and maintenance intervals (scheduled or when necessary) shall be indicated, if applicable subdivided into genera] iivuntenance and special inaintenalire.
6.1 General maintenance
The following actions should be noted in particular
when specifying general iiuunteruuice and intervals for
maintaining heat recovery units:
P periodic, N = when required;
The following actions should be noted in particular
when specifying general maintenance and intervals for
maintaining heat recovery units:
P = periodic, N = when required;
a) determination of the rate of clogging, corrosion and damage on primary and secondary side (P);
b) functional test of seals (P);
c) functional test of drive equipment (rotating exchangers) (P);
d) check of function of defrosting equipment (P);
e) check of function of liquid circuit (P);
f) venting (P);
g) check of frost resistance of heating medium (P);
h) pressure test system on primary and secondary sides (P);
i) determination of fouling on filter in plant (P);
j) check of quality of fluid (P).
6.2 Special maintenance
The following actions should be noted in particular
when specifying special maintenance and intervals for
maintaining heat recovery units:
P = periodic, N = when required;
a) cleaning of primary and secondary side (N);
b) replacement of seals (rotating exchangers) (P);
c) repair of drive equipment (rotating
exchangers) (P);
d) function at test of defrosting equipment (P);
e) function at test of liquid circuit (P);
f) air venting (P);
g) security of frost resistance of heat medium (P);
h) security of tightness on primary and secondary
side (P);
i) change of filters in plant (P);
j) restoration of quality of fluids (N).
6.3 Fault-tracing
A logically constructed fault-tracing diagram shall be prepared.
6.4 Operating statistics
The date of maintenance measures taken shall be noted.
6.5 Fault statistics
The date of faults and operational disturbances which have occurred, and the measures taken, shall be noted.
6.6 List of spare parts
A list of spare parts shall be appended. If applicable, a list shall be made of spare parts stocked (frequently used) in connection with the installation.BS EN 307 pdf free download.Heat exchangers