Mark 93 Series

• Low subcooling operation reduces probability of SIP delays caused by temperature validation faults
• Lay-in dimension allows drop in replacement of higher subcool, competitive traps
• Easy thermal element (bellows assembly replacement only installs in one direction) error-proof
• New design provides excellent flow rates with low subcooling – improves heat-up drainage
• Self-draining when installed vertically (body outlet side down) – either vertical or horizontal connections
• Solid barstock body with fewer cracks and crevices than competitive designs

• Size Range: 1/2″, 3/4″, 1″, 1-1/2″ (DN15, DN20, DN25, DN40)
• Installation Connection Orientation: Vertical, Horizontal
• Connection Type: ASME, DIN, ISO Tri-Clamp and Tube Weld Ends
• Maximum Pressure Temperature: 145 psig (10 barg) @ 350°F (177°C)
• Max. Recommended Differential Pressure: MK93: 10 – 50 psi (0,7 – 3,4 bar); MK93 Option P: 45 – 90 psi (3,1 – 6,2 bar)
• Materials of Construction: Wetted body/plug material: ASTM A479 316L or optional DIN 1.4435; Body Gaskets: Various – all FDA and USP Class VI
• Nominal Cv (Kv): 3.8 (3,30)
• Surface Finish: Internal: SF1, 20 Ra μin (0,5 μm) standard; SF5, 20 Ra μin (0,5 Ra μm) electropolish or better optional
• Subcooling: Less than 3°F (1.7°C)

• CRN (Canadian Registration Number)
• SEP Declaration (Sound Engineering Practice)
• All products use FDA and USP Class VI approved soft goods and seals where possible. Consult each product data for details

1/2″ Mark 93C Series Step File
3/4″ Mark 93C Series Step File
1″ Mark 93C Series Step File
1-1/2″ Mark 93C Series Step File

1. Can you test clean steam traps to ensure that they are operating correctly?

   Balanced port thermostatic clean steam traps can only be tested during SIP temperature hold. During heat-up, the traps are wide open, draining the relatively cooler condensate and air from the system. During temperature hold condensate loads are much less, causing the traps to frequently cycle open and closed depending upon the temperature of the condensate. Hot condensate (at or near steam saturation temperature) will expand the trap’s liquid filled bellows, causing the plug to seat in the trap orifice until the condensate cools enough below saturation temperature for the bellows to contract, allowing condensate to drain through the orifice. Typically, traps will cycle open -> close every few seconds to a few minutes depending up the temperature hold condensate load. It is during this period of continual cycling that traps can be tested with an ultrasonic leak detector by placing the leak detection probe on the trap inlet. Every time the trap opens, the condensate can clearly be heard passing through the trap orifice. Balanced port thermostatic traps fail in the open position. So if no cycling is heard, the trap is not functioning properly, indicating that either condensate is continually passing through the orifice (failed bellows) or the orifice is plugged and flow is stopped or slowed. Note that a failed trap attached to a condensate manifold connected to adjacent traps (common on process skids), can cause temperature validation faults in the adjacent traps. A failed, open trap will allow the pressure in the condensate manifold to increase, slowing the flow of condensate through the adjacent traps causing condensate levels to rise and cool the temperature validation sensors.

2. Why is low subcooling an important feature in a validated SIP process trap?

   If subcooled condensates backs up more than 12-18″, it will wet and cool the SIP validation temperature sensor. Most SIP protocols are violated if the validation temperature sensor measure a temperature decrease of more than .5°C (called a temperature fault). SIP must be stopped, and the fault discovered and corrected before SIP can be continued. This usally results in a minimum of one hour delay in the start of the next batch.