Cooling water 222b

House cooling water strainer cleaning log: (probably needed monthly..., for now monitor closely, e.g. every time system is off...)

Done on:

first week of /06/2012 - Bill

12/07/2013 - Rob and Mike. Completely solid with sediment. Alarm had triggered.

25/07/2013 - Bill "almost blocked again"

05/08/2013 - Bill "fully choked again"

13/08/2013 - Bill

4/09/2013 - Bill "much less that the previous"

18/09/2013???? - did Bill clean then? I think so...

3/10/2013 - Bill was asked to clean, but we were mid experiment.... it sounds like he cleaned it anyway! And it didn't effect the experiment!

****Pipe return temperature had been notably increased (as high as ~38degC), improved by directing all water flow through just the 1 compressor.

****23/10/2013 - Overheated

24/10/2013 - Bill cleaned "some sludge caught in the gauze but much less than before"

also vented air from our side of the system.

Note: in practice I think the system keeps running for a lot longer than when Bill thinks it is "almost blocked" or "fully choked".

We now have thermometers on the pipes in 222b, see origin file in c:\misc to log pipe temperatures...

Maintenance Summary

222b

Leaks - don't ignore them!

Alarm in front lab - don't ignore!

Closed system:

Check filter - probably yearly.

Check strainer - probably never!

Check pressure levels - 1 bar (see below)

House system:

Clean strainer

Drain dirt sump - 2 weeks? To be determined based on inspection.

Description of cooling water system for 222b.

Overview:The main Rankine cooling water system is dirty (ethylene glycol). Our cooling water is a closed circuit, connected via a heat exchanger.

Layout

222b plant room

Description

RHS of door - switch to control pump for closed cooling water circuit (LEAVE ON)

3 sets of cooling water connections

1 on right wall, two on left wall

Back two sets are large gauge, near LHS set is smaller gauge.

Basic instructions

Check control pump on (switch on RHS, red light lit)

levers horizontal = off (water bypasses compressor)

levers vertical = on (water will flow through compressor).

Report any leaks to Bill Ward x6668 Room 218b

When compressors are not in use turn levers horizontal but leave pump on.

222b front lab LHS on wall Alarm unit

Continuous alarm and red light on - power cut to pump for closed cooling water or overheating

(NOTE this can be muted)

Intermitent bleeping (every few minutes) - overheating closed system? (e.g. if pump for house glycol water is shut off)

Mezzanine

Access to ladder through 219a (Bill Ward or Bill Monaghan have key) Door code CZ0971 (inform Bill Ward before going up ladder).

Mezzanine layout

Control Panel

Upper right column - indicators for compressor cooling pump (run), compressor cooling pump (fault), compressor cooling water (high temperature trip)

In case of power cut, control panel will restart automatically.

The control panel is not currently linked to any University buiding management system

Closed Water system

Untreated mains water, at rest 1bar

Water filter - must be changed every 6 months - 1 year

Pump can be switched off with isolator

Top up with mains water via valve (switch off isolator first)

Current settings when pump on: inlet 0.5 bar, outlet is 2 bar temperature 12 degC

House water (Glycol)

Note we have not direct indicators on this system via our alarm or control panel. Pump for house water is in level 1 plant room.

The skimmer and dirt separator should be maintained officially by estates. Bill Ward will check up also.

Level 1 Plant Room 136

Only the following people have the key: Bill Monaghan, Bill Ward, Douglas Irons and Colin Roberts (technician)

Room contains large glycol tank

There are two pumps

The near pump is for Level 2 (our concern)

The far pump is for Level 1 (Colin Roberts)

Bill ward will make a label for the Level 2 pump - 'inform RHH and 222b lab users if this pump is switched off'

Level 2 pump was replaced 2 years ago. Typical lifetime is 10 years.

Rankine building staff

Bill Ward (technician) x6668 Room 218b

Bill Monaghan (super) x5831 Level 7

Douglas Irons (overall super) (in JW buidling) x5231

Contractors:

Taylor and Fraser

Paul Fingland <engineering@taylorandfraser.com>

Mobile 07717507092

or

George Wallace site agent

Note: when additional water cooled compressors are connected, flow rates will need to reset on closed system.

Routine maintenance: estates are responsible for maintenance on strainer and dirt separator on glycol system in Mezzanine. On the closed system the water fliter should be checked every 6 months. Spare filters? Bill Ward