Reciprocating refrigeration compressor ammonia system special risk points and safety operation guidelines

Reciprocating refrigeration compressor ammonia system special risk points and safety operation guidelines

Ammonia reciprocating refrigeration compressor has wide application in industrial cold storage; ammonia is toxic and flammable, so system design and operation must comply with ammonia refrigeration safety codes. Ammonia concentration in air between 15% and 28% by volume forms explosive mixture; ammonia leakage alarm shall be set at 25 ppm with interlock ventilation function. Xiteliduo ammonia reciprocating compressor adopts anti-corrosion material for internal components; crankcase oil drain port and suction side are equipped with ammonia gas leakage detection points. Small 4-cyl reciprocating refrigeration compressor for ammonia cold storage shall avoid copper and copper alloy materials; ammonia reacts with copper and generates corrosive complex compound. Medium 4-cyl reciprocating refrigeration compressor ammonia system oil separator needs periodic blowdown; ammonia dissolved in lubricant will release gas when pressure drops and create overpressure risk. Large 4-cyl reciprocating refrigeration compressor ammonia system emergency shutdown chain shall cut ammonia supply, activate exhaust fan and trigger audible-visual alarm simultaneously. Large 6-cyl reciprocating refrigeration compressor ammonia system maintenance requires gas purging and oxygen concentration test; oxygen level must be kept above 19.5% before personnel entry. Many ammonia station operators ignore regular gas detector calibration. Uncalibrated ammonia detector may fail to alarm, increasing leakage accident risk by 53%. Single-unit two-stage ammonia refrigeration compressor interstage pressure shall be strictly controlled; excessive interstage pressure increases ammonia leakage risk on interstage pipeline. Cascade unit rarely uses ammonia on low-stage circuit; ammonia is usually applied on high-stage reciprocating refrigeration compressor as the heat rejection cycle.

FAQ

Q1: What is the explosive volume concentration range of ammonia in air? A1: Ammonia forms explosive mixture when air contains 15%~28% ammonia by volume. Q2: Where are the ammonia leakage detection points arranged on Xiteliduo ammonia reciprocating compressor? A2: Detection points are installed at crankcase oil drain and suction side. Q3: Why cannot copper alloy be used in small 4-cyl ammonia reciprocating refrigeration compressor system? A3: Ammonia chemically reacts with copper and forms corrosive complex. Q4: What operation must be performed periodically for medium 4-cyl ammonia compressor oil separator? A4: Periodic blowdown to remove ammonia dissolved in lubricant. Q5: What actions will be triggered by emergency shutdown interlock of large 4-cyl ammonia reciprocating compressor? A5: Cut ammonia feed, start exhaust fan and activate audible-visual alarm. Q6: What risk will appear if ammonia gas detector is not calibrated on schedule? A6: Detector may fail to trigger alarm and leakage accident risk rises by 53%. Q7: In cascade unit, which side is ammonia normally used for reciprocating compressor? A7: Ammonia is commonly adopted on the high-stage reciprocating compressor loop.