diff --git a/app/src/lib/modules/piperack.ts b/app/src/lib/modules/piperack.ts
index bc01702..fd29402 100644
--- a/app/src/lib/modules/piperack.ts
+++ b/app/src/lib/modules/piperack.ts
@@ -28,9 +28,9 @@ export interface PiperackResult {
   effectiveElevation: number; // z_eff: Altura efetiva de aplicação da força global (m)
 }
 
-/** Tabela de Ca genérica para reticulados planos (faces planas) baseada na solidez φ */
-const PHI_ARRAY = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6];
-const CA_FLAT_ARRAY = [2.8, 2.4, 2.0, 1.8, 1.7, 1.6];
+/** Tabela de Ca genérica para reticulados planos (faces planas) baseada na solidez φ (Tabela 26) */
+const PHI_ARRAY = [0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6];
+const CA_FLAT_ARRAY = [3.6, 3.0, 2.4, 2.0, 1.8, 1.7, 1.6];
 
 export function calculatePiperack(input: PiperackInput): PiperackResult {
   const { width, height, elevation, spacing, numFrames, phiStruct, pipes, q } = input;
@@ -45,7 +45,7 @@ export function calculatePiperack(input: PiperackInput): PiperackResult {
   }, 0);
 
   const rawPhi = phiStruct + phiPipes;
-  const phiTotal = Math.min(Math.max(rawPhi, 0.1), 1.0);
+  const phiTotal = Math.min(Math.max(rawPhi, 0.05), 1.0);
   
   // Z efetivo é a média ponderada pelas áreas de bloqueio (se rawPhi=0, usa elevation)
   const effectiveElevation = rawPhi > 0 ? sumPhiZ / rawPhi : elevation;