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API 6A valve description

October 10, 2017 By senoil No comments yet

Sometimes, our gentle customers ask us for API 6A product. But description is too simple that we cannot decide which material to choose, which test we should do. So we want to explain more in this article.

API 6A is specification for Wellhead and x-mass tree equipment which specify material chosen, NDT test adopted, hydro static test application, packing, and etc. We hope to get these detailed requests from customer’s request.

Some friends just call us for gate valve, 4-1/16” x 5000psi. And we need to ask for more information. For single valve, description is like below: SSV, 4-1/16” x 10,000psi, flanged end, DD, PU, PSL3, PR1. We can find that bore size is 4-1/16”, working pressure is 10,000psi. and end connection is flange. But what do DD, PU, PSL3 and PR1 mean?

DD is material class. There is 7 material class which include AA, BB, CC, DD, EE, FF, HH. AA to CC is for sweet service, DD to HH is from H2S service. And HH is the highest material request.

PU is temperature class. See below form.

Temperature Class Centigrade Fahrenheit degree
MIN MAX MIN MAX
K -60 82 -75 180
L -46 82 -50 180
N -46 60 -50 140
P -29 82 -20 180
S -18 60 0 140
T -18 82 0 180
U -18 121 0 250
V 2 121 35 250

 

PSL is production specification level, including PSL1, PSL2, PSL3, PSL3G, and PSL4. From PSL3G to PSL4, gas test is request. PSL level is mainly define manufacturing and fabrication specification.

PR is performance requirement, including PR1 and PR2. In simple words, PR2 valve can work under adverse environment for long time. And PR2 valve cost is much higher than PR1 valve.

As each valve has its Characteristic, we can see description for some valves as below:

  1. SSV, 3-1/16” X 10,000PSI, union end, EE, LU, PSL3, PR2
  2. Adjustable choke, 2-9/16” x 5,000psi, flanged end, DD, PU, PSL2, PR1
  3. Lift check valve, 3-1/8” x 5,000psi, flanged, end, BB, PU, PSL1, PR1
  4. Ball Screw gate valve, 7-1/16” x 10,000psi, flanged end, DD, PU, PSL3, PR1
  5. Gate valve, 1-13/16” x 10,000psi, flanged end, EE, LU, PSL3, PR1
  6. Ball valve, 2-1/16” x 10,000psi, two pieces, flanged end, gear operated, EE, LU, PSL3, PR1
  7. Dart check valve, 2” X10000psi, FIG 1002, DD, PU, PSL3, PR1
  8. Flapper check valve, 3” x 6000 psi, FIG 602, EE, PU, PSL3, PR1
  9. Plug valve, 2”X1” X15,000psi, FIG1502 end, top entry, EE, PU, PSL3G, PR1

NOTE: for dart & flapper check valve and plug valve, we have to do interchangeable with international company product. So size and connection type is following up FMC or SPM, but manufacturing and fabrication is following up API 6A or API 16C standar

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