RETA Breeze Sept/Oct 2025

Ladder wiring diagrams— also something I want to maintain current. Programmable Logic Controller (PLC) programming— anyone who doubts the importance of having the PLC programing as part of the PSI needs to be in atten dance when a processor scrambles at 2 a.m. with all the lines running. You’ll quickly become a believer. Always maintain backups of PLC programming and make sure the backups are updated as part of the MOC process. Equipment lists/Information— I’m a firm believer that IIAR-6 equipment sheets need to be maintained and updated as part of the MOC program. This should include a complete equipment list. Ventilation system data— similar to equipment information, I believe an IIAR-6 equipment sheet should be maintained for the engine room ventilation equip ment. As-built drawings— this seems somewhat ambiguous. Are we talking as-built plan views, fabrication drawings, isometrics, P&IDs, etc…? I would put some of these in PSI and some I would consider construc tion documents. I would caution that only those documents which you will maintain should be part of PSI. Instrumentation list— like the valve list, instrumentation lists should be developed as well. Instrumentation should have identifiers, and these identifiers should be utilized in SOPs, P&IDs and ladder dia grams. 3-way manifold list— you need to cycle 3-way manifolds on a regular basis. How do you make sure you have cycled them all unless you have a list. Also, if the list is constructed correctly, you can use it to document the cycling. Critical valve list— you need to cycle critical valves on a regular basis. You need to specify what is a critical valve and what is not. This takes a dedicated list. How do you make sure you have cycled them all unless you have a list. Also, if the list is constructed correctly, you can use it to document the cycling. (See sidebar for my list.) Safety relief valve list— safety relief valve installation dates must be maintained as part of the PSM/RMP program. This is to assure they are replaced or recertified on a five-year basis. Ammonia detector list— ammonia

The Valve List The valve list is a list of all the ammo nia refrigeration valves that should be maintained. This can become messy—so if you do a valve list for every single valve in your system, the information better be correct. Most facilities just maintain a list of their Pressure Relief Valves and Criti cal Valves. The guidance for this has changed, but I would suggest includ ing the following: • identifier;

detectors require calibration on a regular basis. Very few things are as embarrassing, or as costly, as having an inspector find an ammonia detector which hasn’t been calibrated. The list should contain the identifier, manufacturer, model number and location. I also suggest set points, though if they are outlined in an ammonia detector SOP then I’m ok with leaving them off the list. Safety equipment plan view— the location of safety equipment should be outlined on a plan view. This is a great document to utilize in training. This is also important to have in order to locate the safety equipment. This may include the ammonia detectors, or the ammonia detectors can be shown on a separate plan view. Refrigeration equipment plan view —the location of refrigeration equipment should be outlined on a plan view. This is a great document to utilize in training. Certified drawings —certified drawings should be maintained for all your ASME rated equipment. If certified drawings are not available, utilize general arrangement drawings. Whichever is available. Emergency evacuation drawings —these drawings should show evacuation routes and roll call areas. These need to be maintained as changes are made at the facility. Shelter in place drawings —these drawings should show egress routes to the shelter in place areas. These need to be maintained as changes are made at the facility. Engine room sign —there is a required sign at the engine room listing maximum intended inventory, emergency contacts, emergency instructions, etc. I include it as part of my PSI. There are many other items which could be considered. I am fully aware that not everyone will agree with my

• manufacturer; • model number; • connection size; • port size; • located on P&ID; • room location; • purpose; • function; and • description.

assessment here, which is understand able. PSM is a performance standard. Do what you need to do in order to make your program successful (within the rules). Sarah Selzer, CARO is Compliance Specialist for APSM. Her opinions are her own and do not necessarily reflect those of her teammates at APSM. She has the distinction of having held a RETA chapter office as a teenager, the privilege of growing up in a refrigeration contracting firm, and the curse of thinking about refrigeration compliance all the time. Sarah was also a 2024 RETA 30 Under 30 winner. Volume 4 and further parts of this series will be published in future RETA Breeze publications. To read previous volumes, go to the RETA Breeze archives on www.reta.com.

RETA.com 19

SEPTEMBER/OCTOBER 2025