diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index 16a48b56..a5ed9e49 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -94,8 +94,8 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             var detectedOperationsRequest = new DetectedOperationRequest()
             {
                 IdWell = request.IdWell,
-                IdsCategories = new List<int>() {
-                  1,3
+                IdsCategories = new int[] {
+                    WellOperationCategory.IdRotor, WellOperationCategory.IdSlide,
                 },
                 LtDate = request.LtDate,
                 GtDate = request.GtDate,
@@ -158,9 +158,9 @@ namespace AsbCloudInfrastructure.Services.Subsystems
         }
         private static (double depthIntervalRotor, double depthIntervalSlide) GetDepthInterval (IEnumerable<DetectedOperationDto> detectedOperations)
         {    
-            var depthIntervalRotor = detectedOperations.Where(o => o.IdCategory == 1)
+            var depthIntervalRotor = detectedOperations.Where(o => o.IdCategory == WellOperationCategory.IdRotor)
                     .Sum(o => o.DepthEnd - o.DepthStart);
-            var depthIntervalSlide = detectedOperations.Where(o => o.IdCategory == 3)
+            var depthIntervalSlide = detectedOperations.Where(o => o.IdCategory == WellOperationCategory.IdSlide)
                     .Sum(o => o.DepthEnd - o.DepthStart);
             var depthInterval = (depthIntervalRotor, depthIntervalSlide);