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API 541 TEWAC Performance Requirements

API 541 TEWAC Performance Requirements

API 541 TEWAC Performance Requirements

(OP)
I am reviewing a quotation from a vendor that wishes to deviate from API 541's TEWAC performance requirements. (API 541 section 4.4.1.2.4)

API 541 requires TEWAC's to have the following performance thresholds:

Maximum temperature rise 17k
Minimum temperature rise 11k

The vendor is wanting the following thresholds:

Maximum temperature rise 5k
Minimum temperature rise 3k

Is there a huge issue with this? The cooling water will be water only.

RE: API 541 TEWAC Performance Requirements

Temperature rise of what? Winding? Cooling water? Cooling air?

Muthu
www.edison.co.in

RE: API 541 TEWAC Performance Requirements

(OP)
Great question... I've included a snippet of API 541's section in reference:

RE: API 541 TEWAC Performance Requirements

Ok, it's water inlet vs outlet temperatures. The vendor insisting on lesser water temp rise is good, no?

Normally, 3 to 5 deg C rise in water is what we see in such water to air cooled motors and generators. No idea why API would want a less efficient heat exchanger.

Muthu
www.edison.co.in

RE: API 541 TEWAC Performance Requirements

edison,

The footnote at the bottom explains it - API may be trying to acknowledge that cooling water is at a premium in many process plants. Not all plants have cooling towers, some rely on power-hungry fin-fan heat exchangers for cooling.

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